I have tried milling 1/4" aluminum plate using the dxf’s for the front and back plates of the MP3DP. When milling the first hole, the z-axis plunges down. I tried three different speeds when going in the z direction and got the same result. Attached is the tool info I used when creating the gcode. I set the depth of cut to be 7 mm and the z was to only remove one mm per pass.
I tried a similar setting but on oak plywood. The parts came out very well and a tight tolerance when compared to the model.
I am using a DW660 with a 1/8" Double flute carbide endmill I bought off the V1 Website. I know I need to use a single flute for best case but I read on the aluminum thread that a double flute should still be ok.
My z does tend to move downwards with the 660 on as well. Before starting the gcode I get the bit to be above the material and then click print. Doing this I add an extra pass to make sure the part is milled all the way through.
Any ideas about why this is happening?