When I received my mill, it included some "hold down" clamps. Why would I use these when the mill came with a milling vise? Below is an example of a workpiece that wll never fit into a milling vise that fits on the table. It is a 6" x 6" x .5" piece of carbon fiber composite.
The carbide endmill is cutting 1" x 1" squares, .001" per pass at 25 inches/minute. The hold downs are clamping the workpiece to the mill's table. You need to square the back of the workpiece to the back of the mill table to get square cuts. This is easier than it sounds. I can easily feel a discrepancy of .003".
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