So. How long should a diamond belt last?
Last summer, I purchased an old Lortone combination machine from a local lapidarist. It came equipped with a worn silicon carbide 100 grit grinding wheel. This summer, I decided to upgrade the grinding wheel with an expanding rubber drum and diamond belts. After investing almost $80.00 in the wheel and the belt I was pretty excited to spend the summer grinding with abandon and using my sanding, prepolish and polish equipment and turning out cab after beautiful cab.
At first all was well. I'm almost positive I'm using plenty of water during the grinding.....I sure come out of the process plenty wet. Not seeing any sparks, and as far as I can tell my rocks are staying plenty cool. I've ground maybe 12-15 stones...mostly Lake Superior agate, a couple of aventurine freeforms, and two or three peices of flourite, which I never finished.
The belt appears to be totally worn out. All of the diamond coating seems to be gone except for a little along the very edges. I can see the backing everywhere else. I paid $33.00 for this belt from a reputable supplier in Norway, Michigan.
If a diamond belt is going to be totally shot after about a dozen stones, I'm going back to a silicon carbide wheel. I cannot afford to replace them that often.
From D. Johnson - July 04, 2007 at 18:30:44