When am doing 2d countours with tabs is get small overcuts where the bit is raising and lowering over the tab. Any ideas on how to eliminate this? Thanks Bob
EDIT: If the machine is mechanically sound… (if not, address that first)
Offset by a dimension greater than the defect, leaving a roughing clearance, then make a finishing pass.
If you have Carbide Create Pro enable Ramping.
You need to check mechanical things. It could be run out of your bit in the router. Clean your collet and seat your bit far enough so the top end of your bit extends just past the end of your collet to ensure your bit has the best grip on the collet.
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You probably have the same “overcuts” in all of the corners where the machine changes direction.
They are not “overcuts”. They are actually the only place the surface is correct 
The rest of the path the cutter is deflecting & pulling away from the line. When it sits still (in X & Y) to lift, the deflection is relieved.
Cut a test part with a known even dimension with tabs right across from each other. Now measure the part near the tabs, and in the “overcuts”. I bet the overcuts will be closer to the nominal dimension.
Try to fix whatever slop you have in the machine. Calibrate, Square & Tram. Check runout on the tool/spindle. Then follow Will’s suggestion to cut a very thin pocket instead of a contour.
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