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Post by Toad on Mar 18, 2007 21:39:56 GMT -5
Got my gy-roc vibrating lap going. How long do you do it? For rthose that don't know, it runs on top of a vibratory tumbler. The load in the tumbler will go for a week. Can I just let the thunderegg go that long as well - or for just a few days? That way I can get a few slabs/halves done for one load of rock.
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Post by deb193 on Mar 18, 2007 21:44:48 GMT -5
Make an * with a pencil. Lap for a few minutes. If there are parts of the * that remain, the face is not flat and you need longer on the course. Once it is flat, you can move up through grits fairly quickly. If you have a magnifyier lens, you can look to see that all the scratches are about the same size. IF there are biger ones, then you need a little longer at that grit.
I found they dry out pretty fast, so check often to see if it needs more water. ALso after a while, you get enough mud (especially if you started with something roughte than a cut face) that you just neeed to rince out the pan and recharge.
DO you have a polish pad to put in the pan fo rthe polish step?
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Post by Toad on Mar 18, 2007 22:01:42 GMT -5
All the stuff I'll be lapping was saw cut by the guy I bought all the rock from - wow, that was almost a year ago.
I have a polish 'mat'. Just looks like a piece of rubber.
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Post by deb193 on Mar 18, 2007 22:14:18 GMT -5
I would start a cut face at 220 and inspect it wet and dry to decide when to go to 800/1000 and then just try to guess when it is ready for polish. You will know when the polish is done by the shine.
If you put a rubber-band girdle around the split thunderegg, you can put more than one in the pan.
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Post by Toad on Mar 18, 2007 22:16:01 GMT -5
good idea on the girdle
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stefan
Cave Dweller
Member since January 2005
Posts: 14,095
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Post by stefan on Mar 19, 2007 9:42:04 GMT -5
When I hand lap it is a couple hours for each step- I would probably check them after an hour or so-
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