Some safe starting recipes for the Shapeoko 3 in acrylic (cast).

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TLDW:
With a 1/16” 2-flute square endmill, for pocketing I like:
18k RPM
72 IPM
0.045” DOC
1/32” Stepover

For an adaptive toolpath (and this is a conservative set of parameters) I’d start at:
18k RPM
90 IPM
1/16” DOC
0.01” Optimal load

In a slotting application, or full width of cut contour, I like to back off a little because of the increased wall contact and compromised chip evacuation.
18k RPM
54 IPM
1/32” DOC

With an 1/8" endmill, for pocketing I’d start at:
18k RPM,
72 IPM
0.08” DOC
50% stepover

Adaptive:
18k RPM,
108 IPM
0.125” DOC
0.013” OPT
Again, this is probably quite conservative, but it’s a safe place to start.

2D contours:
18k RPM
50 IPM
0.0625 DOC

And lastly, for a 1/4" endmill like our 201, for pocketing:
10k RPM
75 IPM
0.0625” DOC
0.125” Stepover

Adaptive:
10k RPM
105 IPM
0.15” DOC
0.05" OPT (tested to 0.0625" but that sounds a bit rougher)

And for contouring:
10k RPM
75 IPM
0.055” DOC

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