The importance of experimenting with feed rate and pass depth....DOH!
I'm almost sure that my recent experience is a simple echo of learning that has already been recorded in here somewhere but, here goes:
Have been cutting 1"x 9" x 14" oval trays out of 1.5 x 11.75 x 16 stock (Douglas fir). Then, V-engraving various images on the floor of the trays, V-carving the male mirror image pieces for Zank inlay, and so on.
Problem: Using a 1/2" 60 deg V-bit at the default values (0.2in pass depth; 100 ipm feed rate) I was getting really unacceptable chipping in some delicate but important areas of both female and male workpieces (see, for example, female engravings 1 & 1a, below).
Solution: Changed two variables that I thought might be contributing to the problem. (1) Decreased the V-bit pass depth to 0.1in [Note: At my start depth (.15) and flat depth (.1) numbers for the male pieces the pass depth change was of no consequence. However, the females were flat depth = 0.2 in, and so the new 0.1" pass depth looked a lot less stressful on the delicate engraving details. (2) Decreased the feed rate to 80 ipm.
Hard to know the %-contributions of these two independent variables in the female engravings, but the results are so nice....I'm not going back right now to sort that out. But, though unfortunately I don't have both "before-and-after" pix for a male piece, I do have an 80 ipm example (i.e., the "after" piece; some delicate twigs in walnut)--wow! Lowering the feed rate alone, by only 20%, made a big, big difference---much cleaner, no chipping, hardly any "fuzzies"--the picture below is hot off the CNC, none of the usual clean-up with tweezers/picks/brushes.