Good luck John, it's all worth it in the end........... Tony ... From: "John Abrahamian" <imas1@...> To: <atm_free@yahoogroups.com> Sent: Monday, December...
11546
Tony Gondola
acgna
Jan 1, 2008 4:25 pm
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...
11547
Jacques Savard
suppjos
Jan 1, 2008 4:40 pm
... 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...
11548
davidfpitre
Jan 3, 2008 4:02 am
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 ?...
11549
Thomas Janstrom
t_janstrom
Jan 3, 2008 5:51 am
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...
11550
Greg
gregfurtman
Jan 3, 2008 9:55 am
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 ... ...
11551
Tony Gondola
acgna
Jan 3, 2008 4:16 pm
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...
11552
davidfpitre
Jan 4, 2008 12:03 am
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. ...
11553
John Abrahamian
owl18200
Jan 4, 2008 8:03 am
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...
11554
Arjan te Marvelde
atm_6_6_6
Jan 4, 2008 8:17 am
Why not use a simple CAD program, such as CadStd, and print it out? See http://www.cadstd.com/lite.html Arjan...
11555
John Woodhouse
a.johnw
Jan 4, 2008 3:12 pm
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...
11556
zway2bisfancyfree
zway2bisfanc...
Jan 4, 2008 4:59 pm
... 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...
11557
John Abrahamian
owl18200
Jan 4, 2008 6:20 pm
... . 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...
11558
John Abrahamian
owl18200
Jan 4, 2008 6:44 pm
... 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...
11559
tomofreno2000
Jan 6, 2008 2:48 pm
Where can I find info on making a carbon fiber scope tube? Thanks, Tom...
11560
Greg
gregfurtman
Jan 6, 2008 2:56 pm
... 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 ...
11561
Jerry
atc322asd
Jan 6, 2008 6:09 pm
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...
11562
John Abrahamian
owl18200
Jan 6, 2008 7:24 pm
... 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...
11563
Greg
gregfurtman
Jan 6, 2008 7:29 pm
Jerry, Have you tried the Antique Telescope Society? http://www.webari.com/oldscope/ ... missing but I ... is about ... missing but I ... Benjamin ... have...
11564
tomofreno2000
Jan 7, 2008 3:12 am
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...
11565
John Abrahamian
owl18200
Jan 7, 2008 4:54 am
... Sorry Tom, I thought you'd be able to view the photo section. I've downloaded the images here for you to view: ...
11566
John Abrahamian
owl18200
Jan 7, 2008 5:15 am
... 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...
11567
John Abrahamian
owl18200
Jan 7, 2008 5:19 am
... 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...
11568
John Abrahamian
owl18200
Jan 7, 2008 5:30 am
... 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...
11569
Greg
gregfurtman
Jan 7, 2008 10:13 am
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...
11570
tomofreno2000
Jan 7, 2008 2:24 pm
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...
11571
Greg
gregfurtman
Jan 7, 2008 9:59 pm
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...
11572
Jerry
atc322asd
Jan 7, 2008 10:29 pm
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:...
11573
tomofreno2000
Jan 8, 2008 3:25 am
Thanks Greg. That's good to know. Tom...
11574
Peter
peterpekurar
Jan 8, 2008 3:53 am
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...
