Cut and Finish CNC Parts in One Step

I often use an “onion skin” technique, leaving a thin layer of material behind to hold parts rather than using tabs. This generally provides a smooth edge that does not need as much cleanup as tabs, but does require the parts to be flush trimmed out of the leftover web.

Trimming the parts using a 1/4” bit inside a 1/4” slot can be tricky, and then the bottom edge usually needs to be eased or chamfered as a secondary operation.

But Infinity Tools Brass Pilot Trim bit set features a 3/16” diameter pilot on the bits so it passes easily through the cut slot and the bits come in a variety of round over and even chamfer sizes. So I can cut the parts free from the stock AND finish the lower edge all in one pass using a trim router. All I need is a 1/4" access hole to start the cut.

Infinity Tools sent me the set free of charge for this video.

See the Brass Pilot Router Bits Here.

I cover tabs, onion skins and many other programming topics in my book; Beginner’s Guide to CNC Machining in Wood Check it out.