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...
3208
Craig V
cnightwatch
Jan 2, 2004 4:23 am
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....
3209
James Lerch
lerchman_33713
Jan 2, 2004 7:29 am
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...
3210
Vladimir Galogaza
vgalogaza
Jan 2, 2004 10:49 am
Hi James (Action man), The last year was marked by successfully finished projects initiated by your noticing discrepancy between robofoucault and classic...
3211
sigtauotter79
Jan 2, 2004 11:24 am
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 ...
3212
James Lerch
lerchman_33713
Jan 2, 2004 4:02 pm
... From: "Dominic-Luc Webb" <dlwebb@...> ... mirror ... cord, ... still ... Hi Dominic, ... Very true! Unfortunately I can barely manage the fabrication...
3213
Ken Hunter
atm_ken_hunter
Jan 2, 2004 5:13 pm
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...
3214
Gerry van Dyk
gerryvandyk
Jan 2, 2004 5:38 pm
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....
3215
Bob May
a52chevybob
Jan 2, 2004 7:25 pm
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 ...
3216
Bob May
a52chevybob
Jan 2, 2004 7:30 pm
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...
3217
Ken Stanford
kenstanford39
Jan 4, 2004 6:45 am
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...
3218
Craig V
cnightwatch
Jan 4, 2004 6:48 am
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...
3219
Vladimir Galogaza
vgalogaza
Jan 4, 2004 4:08 pm
Craig, ... You can enter Foucault data to the free analysis program "Sixtests"; by James Burrows downloadable (program not James) from his site : ...
3220
Craig V
cnightwatch
Jan 4, 2004 5:34 pm
Thanks Vladimir!...
3221
Joe
nssdz
Jan 4, 2004 6:33 pm
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...
3222
Bob May
a52chevybob
Jan 4, 2004 10:06 pm
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...
3223
Bob May
a52chevybob
Jan 4, 2004 10:12 pm
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...
3224
pdebaan
Jan 5, 2004 2:12 am
Sure Joe fire, and we will possibly fire back, peter db Ps it won'twork on the Mars Lander, ... Someone ... handy...
3225
James Lerch
lerchman_33713
Jan 5, 2004 6:49 pm
... From: "Dominic-Luc Webb" <dlwebb@...> ... I agree, sounds about right :) ... My setup is pretty simple 120vac 600 watt residential dimmer switch from...
3226
Bob May
a52chevybob
Jan 5, 2004 7:20 pm
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. ...
3227
pbunn
pbunnstf
Jan 5, 2004 8:17 pm
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...
3228
James Lerch
lerchman_33713
Jan 5, 2004 8:58 pm
... From: "Dominic-Luc Webb" <dlwebb@...> ... Both actually :) Here goes some ascii art AC Input ... /---\ / \ F1 F4 ... F2 F5 ... ...
3229
pbunn
pbunnstf
Jan 5, 2004 9:04 pm
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:...
3230
Jean-Guy Moreau
jean_guymore...
Jan 6, 2004 2:01 am
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...
3231
Richard Schwartz
theoboehm
Jan 6, 2004 5:29 am
Did you get the 7" "snoflake"; mirror blank I sent you? Or did UPS get swamped in the Christmas rush? . . . Richard...
3232
jkolling
jkollingnl
Jan 6, 2004 1:46 pm
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...
3233
jkolling
jkollingnl
Jan 6, 2004 3:53 pm
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...
3234
John
owl18200
Jan 6, 2004 6:19 pm
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...
3235
James Lerch
lerchman_33713
Jan 6, 2004 7:05 pm
... 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...
3236
Vladimir Galogaza
vgalogaza
Jan 6, 2004 7:21 pm
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...
