... James: A couple quick suggestions: Doesn't your Foucault analysis algorithm look at a fairly narrow band of pixels along the horizontal axis? If so the...
James is using my openFringe software to create those profiles. It does not reflect the robo profile so he has no way to make it do so. However openFinge does...
For anyone who wants to analyze James data or do similar expriments at other diameters I can send you openFringe. That is what he used. You can use it to do...
Hi Dale, I uploaded your file to try and use, however it says that it is missing "GDIPLUS.DLL" needed to open. I tried downloading 2 times and get the same...
... Stick with 10# if the lap behaves better. I see no ill effects so far with 10# ... This explains the one sided diffraction. This is a good way to do the...
... can ... thought ... Not an average necessarily. That's why I used the intentionally imprecise phrase "more or less splits the difference." ... the ... The...
I forgot to mention that you need windows 98SE or greater to run it I think. I will do some research to see you I can also get you the needed files and what...
I have uploaded a zip file with the gdiplus.dll file that nullfinder needs. I hope that lets it work on older windows operating systems 98 and newer. Dale...
... I've removed my stage from my tester and mounted it on an x-y axis table from my drill press. Greg had suggested I try this for a more stable platform for...
... Hold the phone. The drill press stage will have tons of slop in it. I'll loan you a high precision XYZ stage for your measurements. I'll ship it tomorrow....
... I'll ... ship it ... precision linear ... to new ... You're right-there's just too much play. I tried playing with the adjusting screws but its just no go....
You need to control the knife's lateral movement to about .0001 inch. Other wise the movement is too coarse. I use a 4/40 screew and a 200 step per rev...
... James: OK, why not? Just reading off the reported Strehl ratios from OpenFringe and FigureXP for those 13 mirrors, 8 were rated pass by both interferometry...
... DAle, Thanks for the offer to send the software... is it possible that you could send/post it to the Group? I do not know the package file size or how much...
... Dale, I haven't been working glass all that long. Yet it's sort of puzzling how this tester, made from wood and copper pipe, outperforms in movement this...
... This is from the vignetting of the light by the top of the lens. You need to either put the lens closer to the KE or drop it down a little bit. I see ...
The easy way is to put a spring on to move the stage in one direction against the threads of the rod. This is a common system that is used to take out slop in...
Years ago, the tester was a pair of objects, a light souirce that had a pinhole in the side of it and a KE on a post that could be moved about on the table...
... shadow which ... You need ... Its unfortunate as I've been imageing this way with the lens physically hitting the back of the led. This messes with the...
... direction ... used to ... I already have a spring on the linear movement of the stage. But the real problem is if I want to try maskless testing again I...
... the ... the ... me to ... also ... the ... lifts ... as ... using ... I ... Hi John! Just catching up after a few days absence. I'm sorry my advice for...
... Greg Hi Greg, I had to try and play around with the drill table- I should've asked you HOW to use it. I still have my original tester. As a matter of fact...
Before you make a pitch lap, you need to make a foundation for it. Have you done this? It is highly recommended that you NOT use your grinding tool for a...
I have some 5 micron, and I'll send you some. What is your address? Why don't you want to use it? It will save you a LOT of time, and time is something you...
Actually, if the mirror is fine ground, you can do the blind test on it and detect gross problems with the figure. This works because the reflection is at a...
Don't be silly! You can not do this kind of testing until your mirror is polished! You need to make your pitch lap foundation, finish the grits through 5...
The ronchi and all of the other mirror tests work because the glass reflects light rays like a mirror. In other words, you can see an image of yourself in...
John In order to improve accuracy and repeatability of measurment of my focult tester I mounted the carriage off of a defunct scanner on the print head...
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