Hey everyone. I uploaded two new ronchi photo's of my mirror after 7 Hours. Still looks like a very small hill and a bit TUE. If you see anything i don't let...
Thanks for the various answers I received! I want to make sure I have this right before I go farther. Polar moment of inertia (resistance to twisting/torsion,...
I think your link is to the formula for a solid shaft of circular section. From (distant) memory, the way to get the value for a tube is to calculate for a...
This makes sense.... the moment of inertia of two shapes is the sum of the two moments of inertia. So the hollow square tube is the difference between a...
It looks a little better. Can you post a picture (a drawing) of the path the center of the mirror traces over the lap as you polish? Or maybe it is the center...
Actually, this business is not so obvious and simple. If I were participating in this discussion, I would model the square tube in a full blown 3-d Nastran...
... Yea, if you're looking for the power spectrum of the frequency response after a dump into the structure of energy say from wind, then really only FEA will...
... the path ... Well I don't think I can draw a picture, but here is what my stroke is like... http://www.fvas.net/victor/mirror.htm scroll about 1/3 way...
... I'm hoping for back of the envelope calculations that are reasonably accurate...so I can compare/verify the output of Grape FEA (free!) software: ...
... can be ... What's your opinion of this software: http://www.grapesoftware.mb.ca/ for modeling a simple fork (made of square tube) for flexure/torsion at ...
... i found a good picture this time... http://www.johnstelescopes.com/ go to the polishing section and scroll to the bottom. My stroke is like that (but only...
Hello again Mitchell. The theme of this post will be VARIATION…or a mild dose of randomness. Ok, I think I understand. You do a W and then an M going back...
... From: Jerry Sent: Saturday, December 03, 2005 9:12 PM To: atm_free@yahoogroups.com Subject: RE: [atm_free] Re: Two new photos Hello again Mitchell. The...
... a mild ... crossing ... if you pay ... results of not ... attention to ... box of ... D width ... yup, you got it. I try to keep a little variation in...
... a mild ... would be in ... between them. ... actually that might be a bit differen't because my new lap only has 4 channels each way. Before when there was...
Tom, I have to correct some things from the earlier mail, hit the send button too quickly. The variable U mentioned below is the potential energy in a tube...
I plan to change my German equatorial mount to a fork. It will be used for time-series photometry runs that can last all night. Accurate pointing and polar...
Hi Tom, Here's what I have done in the past and obtained excellent results. The first and foremost design goal was to eliminate all inelastic flexure. ...
This is foreign software and may contain viruses, logic bombs, or other offensive payloads. Furthermore, it was not written in ADA with a Mil-Std-2167...
... Hi Mitchell; You are doing a good job with the polishing. The contrast and definition of the Ronchi screen is really starting to show up well. Your...
... other ... 2168 ... software ... foreign ... know the ... or both! ... i know thios is off topic, but, welcome back richard! I'm glad you decided to stay...
... mirror ... If ... I ... without ... sorry, i deleted the originals to save space i'll put them back up soon. I'm using the 1/4 stroke WITH side to side...
... My mission critical project is operating a chainsaw to get sky access for the observatory. My rules are to wear Kevlar chaps and steel-toed boots. ...
I made some good reflector whit photocopier lens one is setup for moon the other for sun I plan to install it permanetly outdoor and I live at north 47'N 71'o ...
... Hi Mitchell, I think you will see a big improvement to the sphere if you just use a back and forth motion. Try I session and see what you think. You the...
Whatever you do, I do not recommend shaving in the shower with a straight razor! ... From: atm_free@yahoogroups.com [mailto:atm_free@yahoogroups.com] On Behalf...
