Search the web
Sign In
New User? Sign Up
atm_free · Amateur Telescope Making
? Already a member? Sign in to Yahoo!

Yahoo! Groups Tips

Did you know...
Hear how Yahoo! Groups has changed the lives of others. Take me there.

Best of Y! Groups

   Check them out and nominate your group.

Messages

  Messages Help
Advanced
Messages 11545 - 11574 of 12111   Oldest  |  < Older  |  Newer >  |  Newest
Messages: Simplify | Expand   (Group by Topic) Author Sort by Date ^
11545
Good luck John, it's all worth it in the end........... Tony ... From: "John Abrahamian" <imas1@...> To: <atm_free@yahoogroups.com> Sent: Monday, December...
Tony Gondola
acgna
Offline Send Email
Jan 1, 2008
4:11 pm
11546
This is not generally done in a production environment. The distortion that's caused by a well design mirror test stand is known and an experienced optician...
Tony Gondola
acgna
Offline Send Email
Jan 1, 2008
4:25 pm
11547
... WE start this one in special way here after 400 years hope the same oportunity to all of you ... http://monquebec2008.sympatico.msn.ca/MonQuebec2008/ jack...
Jacques Savard
suppjos
Offline Send Email
Jan 1, 2008
4:40 pm
11548
What is a simple but fairly accurate way to turn my PLOP X,Y coordinate results for triangles into a template? Is there a graph paper with 1cm grid ?...
davidfpitre
Offline Send Email
Jan 3, 2008
4:02 am
11549
There should be graph paper with 1cm grids (although in most cases they will be sub-divided into 1mm graduations), try your local stationers, but if you're in...
Thomas Janstrom
t_janstrom
Offline Send Email
Jan 3, 2008
5:51 am
11550
There is a free program available called gpaper.exe (Google it) that will allow you to print your own graph paper. ... they will ... but if ... luck out ... ...
Greg
gregfurtman
Offline Send Email
Jan 3, 2008
9:55 am
11551
Here's one way: Get yourself a low cost or freeware CAD program. Lay out the points and shapes and then export to a PDF file at life-size scale. Take the file...
Tony Gondola
acgna
Offline Send Email
Jan 3, 2008
4:16 pm
11552
I just found this free software program: www.atmsite.org/contrib/Holm/cellparts/cellparts.html It lays out and pretty accurately prints cell part templates. ...
davidfpitre
Offline Send Email
Jan 4, 2008
12:03 am
11553
I was lax with a critical component of working a large mirror into submission. There seems to be a high area in one part of the 25" blank out near the edge on...
John Abrahamian
owl18200
Offline Send Email
Jan 4, 2008
8:03 am
11554
Why not use a simple CAD program, such as CadStd, and print it out? See http://www.cadstd.com/lite.html Arjan...
Arjan te Marvelde
atm_6_6_6
Offline Send Email
Jan 4, 2008
8:17 am
11555
Out of interest there used to be a web page with some info on using flat angle grinder type segmented cutting discs on the web. A milling machine and rotary...
John Woodhouse
a.johnw
Offline Send Email
Jan 4, 2008
3:12 pm
11556
... John, The steps you have taken should improve your results. I had a similar problem with a thin 16 inch mirror because of a high spot on my turntable. I...
zway2bisfancyfree
zway2bisfanc...
Offline Send Email
Jan 4, 2008
4:59 pm
11557
... . I am going to keep your suggestion in mind Dave and don't be surprised if I bother you with more questions later about a useful overhang percentage to...
John Abrahamian
owl18200
Offline Send Email
Jan 4, 2008
6:20 pm
11558
... flat angle grinder type segmented cutting discs on the web. A milling machine and rotary table was used the aim being to grind radii directly onto glass. A...
John Abrahamian
owl18200
Offline Send Email
Jan 4, 2008
6:44 pm
11559
Where can I find info on making a carbon fiber scope tube? Thanks, Tom...
tomofreno2000
Offline Send Email
Jan 6, 2008
2:48 pm
11560
... Working with carbon fiber is pretty much like working with fiberglass, although a wee more $$. You'd have to make some sort of a mold. Try ...
Greg
gregfurtman
Offline Send Email
Jan 6, 2008
2:56 pm
11561
I have an antique brass refractor tube. The lens and cell is missing but I have the end piece that is the base of the push pull cell. The tube is about 5...
Jerry
atc322asd
Offline Send Email
Jan 6, 2008
6:09 pm
11562
... Tom- You can see an 80 mm short tube I constructed at this link: http://tech.ph.groups.yahoo.com/group/naperastro/photos/browse/a185?b=41&m=t&o=0 John A...
John Abrahamian
owl18200
Offline Send Email
Jan 6, 2008
7:24 pm
11563
Jerry, Have you tried the Antique Telescope Society? http://www.webari.com/oldscope/ ... missing but I ... is about ... missing but I ... Benjamin ... have...
Greg
gregfurtman
Offline Send Email
Jan 6, 2008
7:29 pm
11564
Hi John, You made one eh? So do you just use carbon fiber twill fabric (I saw this at the link Greg gave for Tap Plastics - thanks Greg) in place of fiberglass...
tomofreno2000
Offline Send Email
Jan 7, 2008
3:12 am
11565
... Sorry Tom, I thought you'd be able to view the photo section. I've downloaded the images here for you to view: ...
John Abrahamian
owl18200
Offline Send Email
Jan 7, 2008
4:54 am
11566
... Here's a link to S glass which is I believe what I made the tube out of. It is fibreglas cloth in one direction of the weave and carbon in the other...
John Abrahamian
owl18200
Offline Send Email
Jan 7, 2008
5:15 am
11567
... The S glass is the one weave direction and graphite is the other so you must order the GRAPHITE 3.5 oz/yard cloth. It is black and white checkerboard in...
John Abrahamian
owl18200
Offline Send Email
Jan 7, 2008
5:19 am
11568
... place of ... cloth? ... all that ... The cloth I used was around $40 / yard. It was 38" in width so you'll be short and have to overlap the ends to get...
John Abrahamian
owl18200
Offline Send Email
Jan 7, 2008
5:30 am
11569
Tom, If you go ahead with your project make sure you use an epoxy resin. Who ever sells you the cloth will also have the correct resin. Epoxy resin is much...
Greg
gregfurtman
Offline Send Email
Jan 7, 2008
10:13 am
11570
John, Greg, Thanks much for the information, photos, and advice. It seems the aeromat layer would be very important for stiffness. It also looks like this is...
tomofreno2000
Offline Send Email
Jan 7, 2008
2:24 pm
11571
Tom, I've been using WEST System and System 3 epoxies for the last 25 years on various projects. I know the WEST products were developed by boatbuilders who...
Greg
gregfurtman
Offline Send Email
Jan 7, 2008
9:59 pm
11572
Thanks, I'll try that. Jerry ... From: atm_free@yahoogroups.com [mailto:atm_free@yahoogroups.com] On Behalf Of Greg Sent: Sunday, January 06, 2008 2:29 PM To:...
Jerry
atc322asd
Offline Send Email
Jan 7, 2008
10:29 pm
11573
Thanks Greg. That's good to know. Tom...
tomofreno2000
Offline Send Email
Jan 8, 2008
3:25 am
11574
I've also used Aeropoxy because it has a higher transition temp and cheaper than West Systems. Saves you from the hassle of having to high temp cure it. It is...
Peter
peterpekurar
Offline Send Email
Jan 8, 2008
3:53 am
Messages 11545 - 11574 of 12111   Oldest  |  < Older  |  Newer >  |  Newest
Advanced
Add to My Yahoo!      XML What's This?

Copyright © 2007 Yahoo! Inc. All rights reserved.
Privacy Policy - Terms of Service - Guidelines - Help