Quote Originally Posted by Christopher Walrath View Post
Ian, have you ever used automotive grade valve lapping compound and do you know of its effectiveness, pros, cons?
Yes, I've used fine lapping paste in the past to make a temporary screen, but it's to coarse, it's not really any faster than using #400 grit either. It takes more cleaning off after as well.

Quote Originally Posted by David Grenet View Post
Have you tried doing two at once instead of using a separate grinding piece? As you say, modern glass is very flat so the reason given in 1898 for not doing it shouldn't stand any more...
You can grind 2 smaller screens together, I've done it but it's not as easy to maintain even pressure etc while you're grinding - there's too large a grinding area, also more difficult as it's harder to hold, this is where a smaller 1/4" - 6mm thick piece of glass really comes into it's own, even with larger screens.

Quote Originally Posted by doughowk View Post
Very good article. Thanks Ian. Now just need to find a silicon carbide supplier.
You might try here they should stock grit, if not they'll certainly tell you who does

Gem Lapidary Jewelers
Gem Lapidary Equipment Inc*
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Jacksonville, FL