Post by jaken on Dec 12, 2023 22:29:57 GMT -5
Hello!
I have a 12 inch rotating flat lap that I am losing my mind over. I have tried polishing various rocks (agates, wood, jasper) on it, and I seem to always end up with random scratching before I am even done with the 400 grit. I have new-ish diamond resin pads, in 100, 220, 400, 600, 1200 grits that I keep clean and in separate bags.
It seems to all be going well, then pitting and/or random scratching will appear halfway through a grit sequence. I have not even made it past 400 as I keep having to reset.
I thought I had broken in the disks with about 1 hr polishing on each one, using the full surface area. I also don't get this issue at all when using silicon carbide wheels, or making cabs. Granted some rocks polish better than others but for say jasper usually I can get a mirror finish even with initial cracking. I am spending about 30 mins per grit and applying light pressure.
What could be going on??
Here are some photos for reference:
Notice the scratching on the bottom right. This showed up about halfway (20 mins) into a 220 grit.
Notice the pitting on the left side. The rock was totally smooth after the initial saw cut.
Thank you!
I have a 12 inch rotating flat lap that I am losing my mind over. I have tried polishing various rocks (agates, wood, jasper) on it, and I seem to always end up with random scratching before I am even done with the 400 grit. I have new-ish diamond resin pads, in 100, 220, 400, 600, 1200 grits that I keep clean and in separate bags.
It seems to all be going well, then pitting and/or random scratching will appear halfway through a grit sequence. I have not even made it past 400 as I keep having to reset.
I thought I had broken in the disks with about 1 hr polishing on each one, using the full surface area. I also don't get this issue at all when using silicon carbide wheels, or making cabs. Granted some rocks polish better than others but for say jasper usually I can get a mirror finish even with initial cracking. I am spending about 30 mins per grit and applying light pressure.
What could be going on??
Here are some photos for reference:
Notice the scratching on the bottom right. This showed up about halfway (20 mins) into a 220 grit.
Notice the pitting on the left side. The rock was totally smooth after the initial saw cut.
Thank you!
