Input, opinions and tips for new cabbing Apr 19, 2019 16:15:47 GMT -5
Post by rockjunquie on Apr 19, 2019 16:15:47 GMT -5
For many years I did not angle the bottom because the mounts I was cutting for did not require it. Now all stones get either a chamfer (more or less
45 deg) or round with a 325grit diamond wheel. This reduces the stress on the cab while it is being set (reducing chipping). For buff top cabs I also round or chamfer the sharp edge where the dome transitions to the girdle. This keeps the top from chipping. As for flat spots alikat218 we all get them and for me it is due to being too impatient. I also found a cab I "finished" I have to redop to take out some lines I did not notice while it was wet. When I started cutting there were only domed cabs none of this straight sides or angled girdle and low dome tops. This technique came about because of diamond wheels which allow a cutter to cut low angles and get good doming all the way across the stone. Not that these buff tops were not done with SiC wheels but they were much harder to do. Also a dome from with a nice curve from back to the top of the stone removes more material than the low dome buff top cabs so diamond has allowed cutters to speed up cutting and be more creative. For the last 40+ years I have cut mostly replacement stones for local jewelers (unfortunately most is Black Onyx).
Thank you for your post! Very thoughtful. I didn't see it when I posted above and I notice we agreed on a few things.
I didn't know about the change in cabbing with the advent of the genie type machines. Interesting.