1/4″ Flat Compression End Mills now available on our store

Hi everyone, I’m happy to announce that we now have 1/4″ Flat Compression End Mills available on our store! These compression bits work basically the same as our 1/8″ Flat Compression End Mills , just with a larger cutting diameter.

If you’re interested in learning more about compression bits and how they work, check out our old post about compression bits.

When I started cutting this project, I realized that I had set the depth of cut too shallow as to not get past the upcut part of the end mill. I stopped the cut and started it again after changing the gcode. I guess this is a bit of a happy accident as we can show the difference between using an upcut bit versus a downcut bit, and how it affects the quality of the edge on this particular piece of plywood.

Because on the first part of the cut, only the upcut portion of the end mill is being used, we are pulling the chips up, splintering the top surface of the material. Changing the depth of cut to 5mm engages the downcut portion of the bit, pulling the chips down and leaving a smoother edge.

For this project, I used a feedrate of 1400mm/min and a depth of cut of around 5mm. The upcut portion of this end mill is 4mm long, and as long as your depth of cut for your first pass exceeds 4mm, you will be engaging the downcut portion of the end mill.

In any case, after setting up the job properly, testing shows clean, crispy edges on both the top and bottom surface of the material!