Looks good Bob. I'll have to make me one of those ball turning tools for my lathe, in my spare time.
Looks like UHMW-PE (ultra high molecular weight polyethylene). It is slippery stuff usually used for slideways, bearings, etc. Also cutting boards.
I'm giving my guess of Delrin but I could be wrong. It comes in black and natural white. It's very hard and has a good amount of weight. If it is, that slab is worth some money. I'd ebay it if you can verify that. Even if it's another kind of plastic, that's a big chunk and should be worth some money.
I don't think it has a specific use in the size it is in, but rather stock material to make something from. Probably came from a manufacturing plant that someone worked at. (nobody will miss this one little piece)
When you going to get that 63 done?
When you going to get that 63 done?
2020?
This stuff cuts and machines very well. I'll have to try the float test and see what happens.Hard to tell without seeing it, but my guess would be Delrin or UHMW. I'm told that UHMW floats in water and Delrin (acetal) and PTFE do not, but I have not personally confirmed this. One major consideration is how a material is fabricated or machined. Delrin/Acetal is a very hard plastic and machines very well and can be held to tight tolerances (+/- 0.005″) whereas realistically (+/- 0.05″) is the best you can get out of UHMW without extraordinary measures. UHMW is much softer and less dimensionally stable; however, it is slicker and (much) more economical.
It would make a nice cutting board but I don't think he wife would like to lift and move this slab, besides I don't think I could ever get it clean enough.Looks like the same material I see every day in meat rooms, cutting board? Won't melt, and very durable.