Surfacing Resin?

[ClayM325]

So I am trying my hand at using castable resin making a resin river shelf. The pouring went fine, and after that i wanted to surface both sides to get it perfectly flat and the bit is badly taking chips out of the resin. ANy suggestions? Below if a pic. Bit i was using is amana 2250. thanks!

shelfpic.jpg

[bking1836]

Hi, what were your feeds and speeds and pass depth? And did you use all 4 insert knives or just two? Were they the knives made for MDF or the special diamond ones for hardwood?

[ClayM325]

Hi, what were your feeds and speeds and pass depth? And did you use all 4 insert knives or just two? Were they the knives made for MDF or the special diamond ones for hardwood?

I was cutting at 8" a second, tried 12k rpm and 18k rpm same result with both. using 2 of the hardwood cutters.

[bking1836]

I was cutting at 8" a second, tried 12k rpm and 18k rpm same result with both. using 2 of the hardwood cutters.

8ips at what pass depth? That strikes me as fast but I don't know what machine you are using.

[ClayM325]

8ips at what pass depth? That strikes me as fast but I don't know what machine you are using.

.100 inch

Typing more here because it told me my message is too short lol

[bking1836]

Others with more experience will hopefully weigh in, but 8ips with .1" bites seems like too fast and too deep, especially for something hard like resin. When I surface hardwoods with the Amana rc-2551 (similar, just larger), I tend to run 3-4ips at .05" bites. Epoxy is both harder and more brittle...Also, if your spindle is even a little out of square, you're going to end up digging even deeper than your .1" on the edges, and that might account for the chipping pattern that you're experiencing.