jaken
off to a rocking start
Member since December 2023
Posts: 1
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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: ![](https://lh3.googleusercontent.com/pw/ABLVV842fCWz1sU_x5S9oU78ShclZMJTbcpcNmQVsSP-8LJ5kvEl2n5L1Q-QbdlmTheueta7nVz_1eArMyQLvAXQoP1m1hBf-fWNGr6whtOnLqNeIQl4XgLwiGmkfN9GcU-YtpGSf2hFavOlHhrt4C8bijsd7gi0Is3EpyeGdhtUpRByqX3wiAK4u5EF3i4ViW9-akMIs2PG2DTXb18iXtbHa5Z7B-jchmAd-_obJExwTh62kOLtq8fnqjbVE_-IQfMDOPB3iOGo64YVWpoy1h5UKbfmljDBnySkHHYmqMJFt1ZhiM_9tQEJvbvQjf4s06oZTscdKY1wHzbcU1gk693gU3ihowCBsjOtYyFDIuW_ulHkmOCFTKw1lDMdhdEl0k9hJD0mMZNQZ5whqRay5vQEelX9DzI9uMB3svsjyI1kkyS0thCIENkN80ew82_gSNhVL4mXZCaZDSmp4NSFGbCodixJxSoib_ZjOkt7UTg-ro4Z-7D4JapMlJ0Mgg3fMbKZMsCI7LCF6FridWf-ksoNIbcos7R3loQU9EUdgWwGSSsGTKiCnePzkXKiK4EiOWEW0_Gxhx-ASEJgQ5XWd5sKueuKgDRA2DxlW_G1UBAhOJ-t-BsaCfftFqC10yxwPjZrtSBhyW98QdKZRZ-dFCZxsS2DwBynzUdEHH5uYNeaWe9-frVoJMwUshHwInC-iSUOZ5HaObxsrOefZImIf9d2uMZq8Yz1tOgYIO5Pw99Es3q0JMC6t2qcQaPUD4VFqWIoC3wN0BdFzaetWMxlBq6lSNAkdLgypkzkPnnOWNSPfm-AF9xos0o-Pqqnw8eUQXxrYGVE51LSpKNbDB4cf2Q179YTrtGXYaswyZw619xtBwsbFc1y53r674ZF69aTbLQKzw-_gZ-KZEKkZaqclq1_uDS_fP5JMgILkcId7Xl3=w685-h913-s-no?authuser=1) Notice the scratching on the bottom right. This showed up about halfway (20 mins) into a 220 grit. ![CDN media](https://preview.redd.it/9pwk83agbz5c1.jpg?width=685&format=pjpg&auto=webp&s=c3d914e49b80808645834aae4cff59ec18069938) Notice the pitting on the left side. The rock was totally smooth after the initial saw cut. Thank you!
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Post by victor1941 on Dec 13, 2023 17:10:21 GMT -5
Jaken, I wonder if the cracks are possibly holding and then releasing grit into the next smooth stage. I have had plume that I was cabbing release abrasive material from pits that I didn't clean sufficiently and then scratch the next stage. Did your other rocks have cracks?
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MadMax
starting to shine!
Member since January 2023
Posts: 32
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Post by MadMax on Dec 15, 2023 12:34:46 GMT -5
Novice here with little to no experience but I have seen Youtube videos that mention the RPMs (too slow/too fast) can sometimes cause issues.
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