Vbit speeds in Dibond/Aluminum composite?

Does anyone have a good feed/speed/DoC for running Vbits in Dibond or other similar aluminum composites? It seems that no matter what I try, I can’t get a cut free of chatter marks in it…

Tried and tested settings for a .250 60 degree Vbit and a single flute 30 degree engraving bit would be greatly appreciated.

For a really clean edge, you should run 2 ops. Use the offset feature to create the first, leaving a couple thou for the second op.

-Edward

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