Shapeoko xxl cutting to much at once?

[WillAdams (William Adams (Carbide 3D))]

A #201 endmill as noted at: https://shop.carbide3d.com/collections/cutters/products/201-25-end-mill-cutter-qty-2 has:

Cutting Length: .75"

Yet you are trying to cut a thickness of:

1.875" (can you even get that much stickout w/ a #201 and not rub the collet against the material?)

You need a tool w/ that much cutting flute length (or almost that, a little bit of rubbing at the top is usually manageable).

See: https://wiki.shapeoko.com/index.php/Endmills#Long_endmills

A further consideration is you are trying to cut a pocket just as narrow as the endmill — this results in near constant 100% tooling engagement — best practice is to add geometry and cut as a pocket down to at least tab depth:

Adding geometry to cut as a pocket with a finishing pass

One technique which is often suggested to avoid slotting is to add geometry around a part which one wishes to cut out and cut as a pocket down to tab depth — here’s one technique for that. In this case, the project is a bevel gauge which will be cut out of 0.0625" (~1.5mm) thick aluminum: [bevelgauge] Due to the narrowness of the angles, an 0.03125" endmill has to be used, so after importing and scaling the file (we will be cutting out one which is 3") we select the perimeter and offset it tw…