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Had a local guy asking if someone could laser cut some records? After contacting him to see what he was trying to do. I said I could try CARVING them on the shark. He gave 50 records and said if I couldn't do it just keep the records or throw them out..... I only ruined 2 of them and that was because they were sticking to the sacrificial bed.... after putting a sheet of paper under the records it worked great. I even have to make a 2nd set for him now after he saw pic.
The sticking was because of the hot vinyl being forced below the record- I was using a down cut 1/8'' end mill. I think if i was using regular, up cut bit it would of been fine..... I was forcing the fresh cut hot vinyl under record and into the slight groove of cut tool path. the paper I added under it allowed me to pull it up mostly in big junks. I used 3 hot glued bumps at 9-12-3 o'clock to set records up against and the had a scrap pc screwed to the bottom-6 o'clock and used a scrap 1 x 1 board wedged a t the bottom 1/2 of record. this held it fine I just used my hand to hold record down when cut started and held the cut out letter from being flung once cut loose. I also cut at 25% speed for tool path and adjusted the router speed so as not melt on the radius cut vs straight cut. Hope this helps.