Re: ATM Using Sand to hog out 10"?

[Anthony Stillman <atmer@flash.net>]

>Dear fellow ATM's,
>
>My current project is a 10" f/6.
>
>I am currently trying to hog out the center using #80 carb. So far I've done
>50 wets, all chordal type strokes, MOT. I have been measuring the sag after
>each session using a straight edge and and opticians ruler marked to 100th
>of an inch.
>
>I am using a facited tile tool. Tiles epoxied on to a marble base.
>
>Heres the problem:
>
>It didn't take long (about 20-25 wets) to bring the center down to about .03".
>Since then I have made little progress bringing the center down beyond .03"
>(It may be .033?) Same type of strokes.
>
>Is there a reason things are slowing down.
>


Put your back into it son


>I thought about using sand to do the hogging out part and then go to #80 grit.
>Is this a good idea or am I on the right track?
>

Stick with the #80, you can save the mud, wash it and re-use it if necessary

>Anyone? Anyone?
>
>The target sag is about .10. I know I've got a lot of glass to hog out.
>

mirrors 10" and larger take perceibably longer,both to push the hog out and
the center down


>Thanks for the help! This is a great list. I would never have gotten my
>first mirror
>done( 6" f/8 )without it!!!!
>
>BTW This may be a "Grind more..worry less" situation.
>
>Michael Robinson
>Waco, Texas



Anthony
marble marbler