From: owner-utah-astronomy-digest@lists.xmission.com (utah-astronomy-digest) To: utah-astronomy-digest@lists.xmission.com Subject: utah-astronomy-digest V1 #58 Reply-To: utah-astronomy-digest Sender: owner-utah-astronomy-digest@lists.xmission.com Errors-To: owner-utah-astronomy-digest@lists.xmission.com Precedence: bulk utah-astronomy-digest Saturday, October 6 2001 Volume 01 : Number 058 ---------------------------------------------------------------------- Date: Thu, 4 Oct 2001 18:13:50 -0700 From: "William Kelley" Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Brent Watson is your local mirror-making guru. Be sure to consult him. Bill Kelley - ----- Original Message ----- From: David Moulton To: Sent: Thursday, October 04, 2001 2:34 PM Subject: (utah-astronomy) (Utah Astronomy) Mirror making advice > I'm toying with the idea of starting to grind a mirror, my first, this > winter. I have a problem that I'd like some advice on. > > I don't really have a great place to do the grinding. My basement is all > finished/used, so I can't really do it there. I do have room in the > garage as well as a small shed in the back yard. My worry about those > two places is that they are not stable temperature-wise. How much does > that matter? The kits I have been looking at are plate-glass, which I > understand is more sensitive to temperature changes. Perhaps that's a > bad idea. > > Any thoughts? I'd also like advice on places to mount the blank during > grinding (barrels, pipes, etc) that are preferably of small diameter. > > Thanks > > dave > > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. > - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Thu, 04 Oct 2001 19:13:39 -0600 From: Patrick Wiggins Subject: (utah-astronomy) Re: Mirror making advice Brent has a new email address. It's brentjwatson@yahoo.com. Patrick :-) William Kelley wrote: > > Brent Watson is your local mirror-making guru. Be sure to consult him. > Bill Kelley - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Thu, 4 Oct 2001 22:20:10 -0600 From: "Gary Liptrot" Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice Hi Dave, I just finished grinding a 10 inch mirror, my first ever, in a "class" with Brent Watson. It was a blast. It was fun to get together with a bunch of strange people like me and push glass. Boy was my wife mad when she found out I wasn't having an affair but rather was spending my time making telescope mirrors... B) Just kidding. What size mirror are you starting with? Some basics that I can quickly pass on to get you started: 1) Make a simple bench to grind on. Brent showed us a very simple design that is John Dobson approved. It sure saves your back when you are sitting on the same surface you are grinding on. I even went through a gall bladder operation in the middle of the class and still finished my mirror on time because of that bench (and a lot of determination). Oh, and it doesn't weigh a ton like a water filled barrel and takes up just a small amount of space. It looks like a picnic table bench. Two 2X6's side by side about three feet long. A gusset made out of 2X6 at each end slanted to match the legs at about 10 degrees. Four 2X6 legs about 16.5 or 17 inches long screwed into the gussets and top of the bench. Then put a flat board at one end that will fit your mirror plus a little extra. You can then put some wooden or rubber bumpers at 10 o'clock, 2 o'clock and 6 o'clock loosely to stop the mirror and tool from sliding around without pinching them. (Yeah, I just read what I wrote and I don't think that I could build a bench using these instructions... B) ) Call me or email me personally and I'll explain better, I'm in the Ogden phone book and my email is at the end of this post. 2) Don't worry about temperature too much when searching for a grinding place. We used Brent's aircraft hanger. We ground in the winter time so our mirrors were cold then hot then cold etc.. You may need to be careful during figuring but the hogging out, fine grinding and polishing will take care of itself. Being clean between grits is more important than temperature. Oh, one warning. If your mirror is cold and you are polishing, don't heat the mirror and pitch tool up too quick before your session. We cracked a few "green" glass tools in class. The pyrex mirrors seemed to take the abuse but when the tools cracked in half we slowed down and used caution after that. Since your mirror is glass just take it easy during that stage. 3) Take the advice of Brent and many on the net, don't test the figure of your mirror with a Ronchi or other test until you have a fully polished "sphere". 4) Best to read Mel Bartels' web page and others in his "Links" before you start. He will explain the "current technology" to you. With the internet available, you don't really have to buy any books but I found the temptation too great. Just remember, less reading, more grinding. You only have to understand the step you are on and when to know you are done with that step. Mel will help you get a big picture of the events in the order they progress. Start with good old 60 grit Silicon Carbide (SiC). You could probably talk Brent out of some. He has about half of a 50 pound sack of it. If not see me. Hope this long winded blurb helped Dave. Keep me and the list posted with your progress. A few of us here in the Ogden/Layton area will be doing some large mirrors in the fall/winter and maybe Brent will do another class if you ask him nice. Good luck 73 es CUL de n7zi Gary Liptrot n7zi@home.com - -----Original Message----- From: owner-utah-astronomy@lists.xmission.com [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of David Moulton Sent: Thursday, October 04, 2001 3:35 PM To: utah-astronomy@lists.xmission.com Subject: (utah-astronomy) (Utah Astronomy) Mirror making advice I'm toying with the idea of starting to grind a mirror, my first, this winter. I have a problem that I'd like some advice on. I don't really have a great place to do the grinding. My basement is all finished/used, so I can't really do it there. I do have room in the garage as well as a small shed in the back yard. My worry about those two places is that they are not stable temperature-wise. How much does that matter? The kits I have been looking at are plate-glass, which I understand is more sensitive to temperature changes. Perhaps that's a bad idea. Any thoughts? I'd also like advice on places to mount the blank during grinding (barrels, pipes, etc) that are preferably of small diameter. Thanks dave - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Thu, 4 Oct 2001 23:21:53 -0600 From: "Larry Frisk" Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Hay Gary! Just what do you mean by "strange people" :-) - ----- Original Message ----- From: "Gary Liptrot" To: Sent: Thursday, October 04, 2001 10:20 PM Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice > Hi Dave, > > I just finished grinding a 10 inch mirror, my first ever, in a "class" with > Brent Watson. It was a blast. It was fun to get together with a bunch of > strange people like me and push glass. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Thu, 4 Oct 2001 23:47:46 -0600 From: "David Moulton" Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice Thanks, the bench sounds very interesting, maybe just what I need. I will email you offlist tomorrow. If I remember correctly, Brent's hangar is at Skypark? I'm in Orem, BTW. I'm thinking of making an 8 inch first, and then something bigger, maybe 15 or 16, after that. My son has been wanting a telescope, so that would be useful for both of us. I have seen Mel's page, but not read it in depth. Thanks for the tip. I haven't bought any books yet. I suspect all I will purchase is the Berry/Kreige bible. Mostly for the telescope building, rather than mirror info. Thanks again, this was just the post I was looking for. dave - -----Original Message----- From: owner-utah-astronomy@lists.xmission.com [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of Gary Liptrot Sent: Thursday, October 04, 2001 10:20 PM To: utah-astronomy@lists.xmission.com Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice Hi Dave, I just finished grinding a 10 inch mirror, my first ever, in a "class" with Brent Watson. It was a blast. It was fun to get together with a bunch of strange people like me and push glass. Boy was my wife mad when she found out I wasn't having an affair but rather was spending my time making telescope mirrors... B) Just kidding. What size mirror are you starting with? Some basics that I can quickly pass on to get you started: 1) Make a simple bench to grind on. Brent showed us a very simple design that is John Dobson approved. It sure saves your back when you are sitting on the same surface you are grinding on. I even went through a gall bladder operation in the middle of the class and still finished my mirror on time because of that bench (and a lot of determination). Oh, and it doesn't weigh a ton like a water filled barrel and takes up just a small amount of space. It looks like a picnic table bench. Two 2X6's side by side about three feet long. A gusset made out of 2X6 at each end slanted to match the legs at about 10 degrees. Four 2X6 legs about 16.5 or 17 inches long screwed into the gussets and top of the bench. Then put a flat board at one end that will fit your mirror plus a little extra. You can then put some wooden or rubber bumpers at 10 o'clock, 2 o'clock and 6 o'clock loosely to stop the mirror and tool from sliding around without pinching them. (Yeah, I just read what I wrote and I don't think that I could build a bench using these instructions... B) ) Call me or email me personally and I'll explain better, I'm in the Ogden phone book and my email is at the end of this post. 2) Don't worry about temperature too much when searching for a grinding place. We used Brent's aircraft hanger. We ground in the winter time so our mirrors were cold then hot then cold etc.. You may need to be careful during figuring but the hogging out, fine grinding and polishing will take care of itself. Being clean between grits is more important than temperature. Oh, one warning. If your mirror is cold and you are polishing, don't heat the mirror and pitch tool up too quick before your session. We cracked a few "green" glass tools in class. The pyrex mirrors seemed to take the abuse but when the tools cracked in half we slowed down and used caution after that. Since your mirror is glass just take it easy during that stage. 3) Take the advice of Brent and many on the net, don't test the figure of your mirror with a Ronchi or other test until you have a fully polished "sphere". 4) Best to read Mel Bartels' web page and others in his "Links" before you start. He will explain the "current technology" to you. With the internet available, you don't really have to buy any books but I found the temptation too great. Just remember, less reading, more grinding. You only have to understand the step you are on and when to know you are done with that step. Mel will help you get a big picture of the events in the order they progress. Start with good old 60 grit Silicon Carbide (SiC). You could probably talk Brent out of some. He has about half of a 50 pound sack of it. If not see me. Hope this long winded blurb helped Dave. Keep me and the list posted with your progress. A few of us here in the Ogden/Layton area will be doing some large mirrors in the fall/winter and maybe Brent will do another class if you ask him nice. Good luck 73 es CUL de n7zi Gary Liptrot n7zi@home.com - -----Original Message----- From: owner-utah-astronomy@lists.xmission.com [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of David Moulton Sent: Thursday, October 04, 2001 3:35 PM To: utah-astronomy@lists.xmission.com Subject: (utah-astronomy) (Utah Astronomy) Mirror making advice I'm toying with the idea of starting to grind a mirror, my first, this winter. I have a problem that I'd like some advice on. I don't really have a great place to do the grinding. My basement is all finished/used, so I can't really do it there. I do have room in the garage as well as a small shed in the back yard. My worry about those two places is that they are not stable temperature-wise. How much does that matter? The kits I have been looking at are plate-glass, which I understand is more sensitive to temperature changes. Perhaps that's a bad idea. Any thoughts? I'd also like advice on places to mount the blank during grinding (barrels, pipes, etc) that are preferably of small diameter. Thanks dave - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 05:40:08 -0600 From: "Gary Liptrot" Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice Larry, You know what I mean you crazy machinist/engineer guy. I really had a blast in Brent's class. Thanks to all my "strange" friends and especially to Brent for putting up with us. That's a trick in itself. 73 Larry de n7zi Gary Liptrot - -----Original Message----- From: owner-utah-astronomy@lists.xmission.com [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of Larry Frisk Sent: Thursday, October 04, 2001 11:22 PM To: utah-astronomy@lists.xmission.com Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Hay Gary! Just what do you mean by "strange people" :-) - ----- Original Message ----- From: "Gary Liptrot" To: Sent: Thursday, October 04, 2001 10:20 PM Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice > Hi Dave, > > I just finished grinding a 10 inch mirror, my first ever, in a "class" with > Brent Watson. It was a blast. It was fun to get together with a bunch of > strange people like me and push glass. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 05 Oct 2001 06:35:29 -0600 From: Richard Brady Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Who are you calling strange? ;) We ought to have a get together to see our finished telescopes some time. Richard Brady rhbstargazer@networld.com Gary Liptrot wrote: > Hi Dave, > > I just finished grinding a 10 inch mirror, my first ever, in a "class" with > Brent Watson. It was a blast. It was fun to get together with a bunch of > strange people like me and push glass. Boy was my wife mad when she found > out I wasn't having an affair but rather was spending my time making > telescope mirrors... B) Just kidding. What size mirror are you starting > with? > > Some basics that I can quickly pass on to get you started: > > 1) Make a simple bench to grind on. Brent showed us a very simple design > that is John Dobson approved. It sure saves your back when you are sitting > on the same surface you are grinding on. I even went through a gall bladder > operation in the middle of the class and still finished my mirror on time > because of that bench (and a lot of determination). Oh, and it doesn't > weigh a ton like a water filled barrel and takes up just a small amount of > space. It looks like a picnic table bench. Two 2X6's side by side about > three feet long. A gusset made out of 2X6 at each end slanted to match the > legs at about 10 degrees. Four 2X6 legs about 16.5 or 17 inches long > screwed into the gussets and top of the bench. Then put a flat board at one > end that will fit your mirror plus a little extra. You can then put some > wooden or rubber bumpers at 10 o'clock, 2 o'clock and 6 o'clock loosely to > stop the mirror and tool from sliding around without pinching them. (Yeah, > I just read what I wrote and I don't think that I could build a bench using > these instructions... B) ) Call me or email me personally and I'll explain > better, I'm in the Ogden phone book and my email is at the end of this post. > > 2) Don't worry about temperature too much when searching for a grinding > place. We used Brent's aircraft hanger. We ground in the winter time so > our mirrors were cold then hot then cold etc.. You may need to be careful > during figuring but the hogging out, fine grinding and polishing will take > care of itself. Being clean between grits is more important than > temperature. Oh, one warning. If your mirror is cold and you are > polishing, don't heat the mirror and pitch tool up too quick before your > session. We cracked a few "green" glass tools in class. The pyrex mirrors > seemed to take the abuse but when the tools cracked in half we slowed down > and used caution after that. Since your mirror is glass just take it easy > during that stage. > > 3) Take the advice of Brent and many on the net, don't test the figure of > your mirror with a Ronchi or other test until you have a fully polished > "sphere". > > 4) Best to read Mel Bartels' web page and others in his "Links" before you > start. He will explain the "current technology" to you. With the internet > available, you don't really have to buy any books but I found the temptation > too great. Just remember, less reading, more grinding. You only have to > understand the step you are on and when to know you are done with that step. > Mel will help you get a big picture of the events in the order they > progress. Start with good old 60 grit Silicon Carbide (SiC). You could > probably talk Brent out of some. He has about half of a 50 pound sack of > it. If not see me. > > Hope this long winded blurb helped Dave. Keep me and the list posted with > your progress. A few of us here in the Ogden/Layton area will be doing some > large mirrors in the fall/winter and maybe Brent will do another class if > you ask him nice. > > Good luck > 73 es CUL de n7zi > Gary Liptrot > n7zi@home.com > > -----Original Message----- > From: owner-utah-astronomy@lists.xmission.com > [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of David > Moulton > Sent: Thursday, October 04, 2001 3:35 PM > To: utah-astronomy@lists.xmission.com > Subject: (utah-astronomy) (Utah Astronomy) Mirror making advice > > I'm toying with the idea of starting to grind a mirror, my first, this > winter. I have a problem that I'd like some advice on. > > I don't really have a great place to do the grinding. My basement is all > finished/used, so I can't really do it there. I do have room in the > garage as well as a small shed in the back yard. My worry about those > two places is that they are not stable temperature-wise. How much does > that matter? The kits I have been looking at are plate-glass, which I > understand is more sensitive to temperature changes. Perhaps that's a > bad idea. > > Any thoughts? I'd also like advice on places to mount the blank during > grinding (barrels, pipes, etc) that are preferably of small diameter. > > Thanks > > dave > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to > "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 07:53:46 -0700 (PDT) From: Jim Stitley Subject: Re: (utah-astronomy) Swap meet I think a Fall Swap Meet would be great! I would support it. Just need a when and where! Jim Stitley - --- Patrick Wiggins wrote: > Here's a vote for a swap meet. > > Patrick :-) > > karen vanderhule wrote: > > > > One other note, isn't it about time for the fall > version of the Northern Utah Swap > > Meet? > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to > "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 09:10:04 -0700 (PDT) From: Brent Watson Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Hi David, I am hoping to do another class for mirror making this fall/winter. The big unanswered question is whether I will still be here or not. As you may or may not know, I am unemployed at present. I would like to stay in this area, but employment may force a move. In the mean time, I'll be glad to help you as much as I can. If you want to get together and talk about how to do this feat, let me know. You can do it on your own, and if you need a bit of coaching I'm available. I once did a class long distance in Duchesne. I flew there four times to help them. It worked out great. Let me know how I can help you. Brent - --- David Moulton wrote: > I'm toying with the idea of starting to grind a > mirror, my first, this > winter. I have a problem that I'd like some advice > on. > > I don't really have a great place to do the > grinding. My basement is all > finished/used, so I can't really do it there. I do > have room in the > garage as well as a small shed in the back yard. My > worry about those > two places is that they are not stable > temperature-wise. How much does > that matter? The kits I have been looking at are > plate-glass, which I > understand is more sensitive to temperature changes. > Perhaps that's a > bad idea. > > Any thoughts? I'd also like advice on places to > mount the blank during > grinding (barrels, pipes, etc) that are preferably > of small diameter. > > Thanks > > dave > > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email > to "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of > the message. __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 11:57:56 -0700 (PDT) From: Jim Stitley Subject: Re: (utah-astronomy) (Utah Astronomy) Mirror making advice Hello Brent, We haven't had a chance to meet yet, but it might be worth giving the people here in the group some idea of what type of job you are looking for and maybe might get some leads - I am sure club members wouldn't mind that much for the off- topic - or email your resume to me directly - I used to be an executive recruiter. have you checked the Utah Newsgroups for job leads??? My email is sitf2000@yahoo.com Jim Stitley - --- Brent Watson wrote: > Hi David, > > I am hoping to do another class for mirror making this > fall/winter. The big unanswered question is whether I > will still be here or not. As you may or may not > know, I am unemployed at present. I would like to > stay in this area, but employment may force a move. > > In the mean time, I'll be glad to help you as much as > I can. If you want to get together and talk about how > to do this feat, let me know. You can do it on your > own, and if you need a bit of coaching I'm available. > I once did a class long distance in Duchesne. I flew > there four times to help them. It worked out great. > > Let me know how I can help you. > > Brent > --- David Moulton wrote: > > I'm toying with the idea of starting to grind a > > mirror, my first, this > > winter. I have a problem that I'd like some advice > > on. > > > > I don't really have a great place to do the > > grinding. My basement is all > > finished/used, so I can't really do it there. I do > > have room in the > > garage as well as a small shed in the back yard. My > > worry about those > > two places is that they are not stable > > temperature-wise. How much does > > that matter? The kits I have been looking at are > > plate-glass, which I > > understand is more sensitive to temperature changes. > > Perhaps that's a > > bad idea. > > > > Any thoughts? I'd also like advice on places to > > mount the blank during > > grinding (barrels, pipes, etc) that are preferably > > of small diameter. > > > > Thanks > > > > dave > > > > > > - > > Visit the Utah Astronomy Message Board: > > http://pub61.ezboard.com/butahastronomy > > To unsubscribe from utah-astronomy, send an email > > to "majordomo@xmission.com" > > with "unsubscribe utah-astronomy" in the body of > > the message. > > > __________________________________________________ > Do You Yahoo!? > NEW from Yahoo! GeoCities - quick and easy web site > hosting, just $8.95/month. > http://geocities.yahoo.com/ps/info1 > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to > "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 13:04:25 -0700 (PDT) From: Brent Watson Subject: (utah-astronomy) OT: Will work for food Thanks, Jim for the note. I have been at Iomega for the last 18+ years in R&D engineering management. I am looking for the same kind af work here in the area if possible. I would welcome any leads that may come from the group. I'll send you my resume separately. Brent - --- Jim Stitley wrote: > Hello Brent, > We haven't had a chance to meet yet, but it might be > worth > giving the people here in the group some idea of > what type > of job you are looking for and maybe might get some > leads - > I am sure club members wouldn't mind that much for > the off- > topic - or email your resume to me directly - I used > to be > an executive recruiter. have you checked the Utah > Newsgroups for job leads??? My email is > sitf2000@yahoo.com > Jim Stitley __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 17:14:57 -0600 From: "Gary Liptrot" Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice >Richard Brady wrote: >Who are you calling strange? ;) Hi Richard, you gotta admit this group is not normal. Maybe not strange but a little weird, whatever that means. Hi to all those from Brent's class, I'll never forget that experience. >We ought to have a get together to see our finished telescopes some time. >Richard Brady >rhbstargazer@networld.com I agree, first I have to put the finishing touches on my scope, like building the OTA and silvering the mirror and such... B) I have been sooooo busy with other things. However, the only thing I think about is getting the time to build the rest of my scope and then start to grind a 16 inch. Bye the way, hi Brent, hope you stay in the area with some rewarding work. Keep us posted OK? Thanks a million for teaching me how to look through the hype of mirror making and see what is really important and what is not. You never asked for compensation for the extra money you spent on the class. I can tell you did it for the love of Astronomy. I gotta go, I think I'm getting a little misty ........... B) Thanks again 73 es GE de n7zi Gary Liptrot n7zi@home.com - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 05:37:53 -0600 From: "Gary Liptrot" Subject: RE: (utah-astronomy) (Utah Astronomy) Mirror making advice Dave, > If I remember correctly, Brent's hangar is at Skypark? Yes it is, so if you need grit, "we" can get you the rough 60 grit free and then help you get some other finer stuff later. I have a great source for the rest but I gotta run. Its 05:30 and work is waiting. >I'm thinking of making an 8 inch first. Good first choice. Your son could even get that ATM spark by helping you. "Hey my dad and I made that scope..." B) >Berry/Kreige bible. Mostly for the telescope building, rather than mirror >info. You're on the right track. One of my favorite books. Good luck and keep in touch 73 es GM de n7zi Gary Liptrot - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 20:00:15 -0600 From: "Larry Frisk" Subject: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 This is a multi-part message in MIME format. - ------=_NextPart_000_0007_01C14DD8.9F103A00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 Here is a problem for the brainy bunch. I was very interested by the discussion that Chuck and Brent were having = a few months ago concerning the use of normalizing fans in telescope = tubes.=20 I sided with Brent and decided that I wanted my fan to draw air from the = top of the tube and exhaust at the bottom to avoid picking up dust from = the ground. Although I really don't think it makes much difference = because the amount of airflow is very slight and the mirror probably = collects more dust in storage than in actual use. I am using a 4" fan that came out of a computer power supply. The scope = is constructed from a 12" diameter Sonotube and is 64" long. The mirror = cell is at the very bottom of the tube and there is about .250 space = between the 10"mirror and the fan. It is pretty obvious from looking at the blade pitch and direction of = rotation which direction the air will flow. I also bench tested the fan = just to make sure which direction to mount the fan. However, to my amazement, the airflow is backwards. It actually draws = air in from the back and exhausts out the top. Can any of you explain to me what is happening and why? BTW I really enjoy reading the comments, interesting ideas, and issues = that all of you write about. _\\|//_ (-O-O-) - -----o00--(_)--00o----- Larry & Kaye Frisk lkfrisk@earthlink.net=20 - ------=_NextPart_000_0007_01C14DD8.9F103A00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 

Here is a problem for the brainy bunch.

I was very interested by the discussion that Chuck and Brent were = having a=20 few months ago concerning the use of normalizing fans in telescope = tubes.

I sided with Brent and decided that I wanted my fan to draw air from = the top=20 of the tube and exhaust at the bottom to avoid picking up dust from the = ground.=20 Although I really don’t think it makes much difference because the = amount of=20 airflow is very slight and the mirror probably collects more dust in = storage=20 than in actual use.

I am using a 4" fan that came out of a computer power supply. The = scope is=20 constructed from a 12" diameter Sonotube and is 64" long. The mirror = cell is at=20 the very bottom of the tube and there is about .250 space between the = 10"mirror=20 and the fan.

It is pretty obvious from looking at the blade pitch and direction of = rotation which direction the air will flow. I also bench tested the fan = just to=20 make sure which direction to mount the fan.

However, to my amazement, the airflow is backwards. It actually draws = air in=20 from the back and exhausts out the top.

Can any of you explain to me what is happening and why?

BTW I really enjoy reading the comments, interesting ideas, and = issues that=20 all of you write about.

 
    =20      =20 _\\|//_
         =20 (-O-O-)
-----o00--(_)--00o-----
   Larry & Kaye = Frisk
lkfrisk@earthlink.net=20
- ------=_NextPart_000_0007_01C14DD8.9F103A00-- - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Fri, 5 Oct 2001 21:18:41 -0600 From: Joe Bauman Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 Larry, were you at the U. of U. around 1968-ish? -- Joe Bauman - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Sat, 6 Oct 2001 12:46:26 -0600 From: "Larry Frisk" Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 Hi Joe, No, I moved to Utah in 1980. I grew up in Idaho and lived in Washington, Oregon, California, and Colorado before settling down in Utah. (military brat) Utah is my home and I plan to stay. I hope to have the opportunity to meet you some day. cya, Larry - ----- Original Message ----- From: "Joe Bauman" To: Sent: Friday, October 05, 2001 9:18 PM Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 > Larry, were you at the U. of U. around 1968-ish? -- Joe Bauman > > > > - > Visit the Utah Astronomy Message Board: > http://pub61.ezboard.com/butahastronomy > To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" > with "unsubscribe utah-astronomy" in the body of the message. > - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Sat, 6 Oct 2001 17:00:00 -0600 (MDT) From: Joe Bauman Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 Likewise! Thanks, Joe - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ Date: Sat, 6 Oct 2001 21:26:24 -0600 From: ltwitkowski@mmm.com Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 No, not until 1974-1979. |--------+-------------------------> | | Joe Bauman | | | | | | | | | 10/05/2001 | | | 09:18 PM | | | Please respond | | | to | | | utah-astronomy | | | | |--------+-------------------------> >----------------------------------------------------------------------------| | | | To: utah-astronomy@lists.xmission.com | | cc: (bcc: Larry T. Witkowski/HI-HealthInfo/3M/US) | | Subject: Re: (utah-astronomy) Date: Fri, 5 Oct 2001 20:02:11 -0600 | >----------------------------------------------------------------------------| Larry, were you at the U. of U. around 1968-ish? -- Joe Bauman - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. - - Visit the Utah Astronomy Message Board: http://pub61.ezboard.com/butahastronomy To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. ------------------------------ End of utah-astronomy-digest V1 #58 *********************************** - To unsubscribe to $LIST, send an email to "majordomo@xmission.com" with "unsubscribe $LIST" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.