The statement of the Ronchi test at the COC being equivalent to the Foucault test is true. The lines on the surface get so large that all you end up seeing is...
Thanks... I think I have it working now. I am tring to do zonal measurements with a 5 zone mask. The Ronchi images suggest that I am close to a parabaloid....
Greetings All, Just thought I'd share the initial results on my latest project, a 24" mirror coater :) Today I fabricated the Square O-Rings from stock 10mm...
Hi James (Action man), The last year was marked by successfully finished projects initiated by your noticing discrepancy between robofoucault and classic...
Hello everyone, I have recently bought three glass tools that someone else has used to make mirrors. There are two 6" and one 8". The 8" still has an old ...
... From: "Dominic-Luc Webb" <dlwebb@...> ... mirror ... cord, ... still ... Hi Dominic, ... Very true! Unfortunately I can barely manage the fabrication...
For those on the ATM_FREE Group that don't know... I also host a Group for the Vacuum eXperimenter located at: http://groups.yahoo.com/group/VacuumX/ You can...
Hi James I just wanted to chime in with some encouragement for you. I am new to ATMing but by profession I design drilling tools for the Oil and Gas industry....
A glass surface is a glass surface and you can grind in any pattern you so desire. I'll note that for doing the flexing of the mirrors, you will be quite ...
Try making the masks the color of the light and then match the shade of the color to the light returns. Make a pair or more of masks so that you don't see all...
Hi everyone, I'm new to this group and browsing through the messages I'm finding anything on this subject and it is of some interest to me. I have an Orion...
I got my Foucault test working using the Everest stick method ( I could not judge the Couder mask very well). I'm still learning and this test looks a little...
Hi All, Soo cool about the Mars Lander huh? Anyway, who out there would like to do an experiment for me. Someone that already has a Foucault test stand made...
The single tube is really quite portable for a scope. You can do a set of telescoping tubes if you so desire but then you spend a lot more time assemblying...
I prefer to use masks with one zone on them for the best accuracy. I use the odd and even (two masks) for most of my work tho as making a mask for each zone...
... From: "Dominic-Luc Webb" <dlwebb@...> ... I agree, sounds about right :) ... My setup is pretty simple 120vac 600 watt residential dimmer switch from...
What are we going to be doing? I'm regularly using a camera (being one of the proponents for the last several years on the subject) for doing the test with. ...
You have a 120 volt dimmer rated at 16 amps at 120 VAC and a step down transformer with a 24:1 ratio. Therefore: The stepped down voltage with the dimmer at...
The load is near 100% resistive. Ideal transformers reflect the exact nature of the load from primary to secondary. Pat Bunn ... From: James Lerch To:...
Hello, i have uploaded a picture showing the image of a point source, a laser diode working at lower voltage, as returned by the 26" open structure mirror...
I have a 10" primary mirror, a 2.75" secondary mirror, a focusser and 2 eyepieces. I would like to build a truss Dobsonian, Any recommendations on where to buy...
http://www.ee.nmt.edu/news/8-10-2001.html http://www.howstuffworks.com/news-item230.htm Is there also a diy schematic available somewhere? Thank you, Joel...
Could somebody please tell me how I could save and or print out the screen dump of my mirror data. I have windows XP and when I click on F8(in FigXP)in the...
... From: "John" <imas1@...> ... Hi John, Sorry for the troubles with FigXP, finding a method to make printing work on all the varios printers turned out...
Jean-Guy, I have seen the picture of the laser source as returned by the 26" open structure mirror. Mirror itself is an impressive sight. You said that as yet...
