What is the current state of things in CMM? I have been reading the posts in the yahoo-group, and there is imo little to no information in there that would help me in tackling this subject by

Hi, It is what it is, not very active, but a place to post about this topic. For myself, I'm quite a ways down the building process and will be returning to that following a bathroom remodel I'm

Ah, I see. Thanks for the explanation. In fact I might enjoy some experimentation myself… but I currently lack the experience and want to complete at least one binewt before committing myself to

this web site contains downloadable figuring spreadsheets for a various machines http://www.astrosurf.com/gap47/T400/Machine/Utilisation_machines/utlisation_machines_eng.htm instead of my modified 24"

Thank you Bill, that was exactly the kind of information I was looking for!

U of Arizona and Perkin Elmer have closed loops systems - UofA interferometer (straight fringes - Reference, computer generated hologram) - Infamous Perkin Elmer interferometer

Again, I have to thank you Bill. To me this is like opening another door of which I did not even know it existed. I will study both the site (yubagold) and the pdf. I am however not yet in a knowledge

from what i have experienced, polishing requires the greatest amount force - my 24" machine http://www.yubagold.com/mom/index.html uses 1/2 hp and 1/4 hp - two stock M-o-M systems - using

What kind of lap diameter do you use for polishing? Same as mirror?, or undersized but fixed, or variable sized depending on the correction you need to make? Thanks for mentioning the pivot point

Hi, Feel free to embed (paste) pictures in your post - this works for most people - or post them to the pictures section of the group and refer to them. Pictures are very helpful. I'm not quite sure

With pivot position I meant the mounting of the tool/lap with the rod that drives it. The MoM manual calls it the swivel or leveling pad. Btw: I saw earlier that you wanted to actively rotate the lap.

On Sunday, November 17, 2019, 04:06:52 AM PST, Rien <lugt@...> wrote: With pivot position I meant the mounting of the tool/lap with the rod that drives it. The MoM manual calls it the swivel or

for polishing i use a lap slightly larger than 70% with a max overhang of 25%,? table at high speed (just short of spraying fine mist) and slow eccentric? -? which strange as it may

besides the low pivot point - controlling the downward force is important which the Zambuto's balanced type "Arm" provides i.e., the other end of the balanced arm has counter weights

http://www.sandsmachine.com/alumweb.htm aluminum discs at a good price and they will ship. https://www.mcmaster.com/toggle-pads curious to see if these two images get

I think what I didn't add was the design goal to keep the effective point as low as possible to the mirror to reduce force loadings (torquing) from side to side. This might be an obvious point but I

Unless there's wedge in the glass you do this by extended machine time with a large polisher. You can always polish out what was polished in... Mark

also the downward force - somewhere saw a posting that gave the pounds per square inch to avoid lap chattering.

My loading for polishing is around 1/4 lb per sq in. If that's helpful. Mark