Thank you very much for these instructions. I made a prototype camera this week and the GG is just a piece of picture frame glass covered neatly with scotch tape. With these instructions, I can make something nice. I've already got the grit ( occasionally run a rock tumbler... :)
Originally Posted by Ian Grant
Thats a great write up. Thanks for that. Well the million dollar question now is. What specific vendor do you order your grit powder from? Thanks.
** UPDATE **
I just ordred 1/4lb each of 320 and 500 delivered for $10. I hope its enough to make a 6x9, 6x6 and 35mm gg for calibrating my cameras. This will be great if it works!! Think of the possibilities.
A couple of quick comments. First, related to safety, make sure you don't breath any of the dust. You don't want to develop silicosis.
Second, if perfect flatness is desired (probably not strictly necessary) you need to grind three pieces of glass together in a sequence where each plate gets ground against every other plate in a repetitive fashion. Grinding two pieces together can produce a curved surface, but three pieces will produce a flat surface.