When I try to machine 15mm MDF, I set the depth of cut to 2mm. The first 2mm works fine. But then just after lowering the Z to -4mm and starting the second “round”, the whole Z axis plunges down way further. It cut through the 15mm MDF and into the spoilboard, until the bit reached it’s maximum cutting depth of 19mm and got stuck.
I used this cutter :https://www.freesjes.nl/nl/hss-frezen-lange-uitvoering/2-snijders/hss-frees-3-0-mm-2f/a-1681-10000178. It’s a 3mm, 2 flute, HSS upcut bit. My router is a Makita clone (a Katsu router), which I used at around 30,000 RPM.
I suspect that while plunging from -2mm to -4mm, the cutter catches on the wood and “screws” itself in, overwhelming the Z axis stepper. Does that make sense?
I did not have this problem when I used a straight edge cutter (it does not have a upcut nor a downcut "spiral). However, that bit is only 14mm so I can’t cut all the way through the 15mm MDF.
Btw, the gcode and the machine itself are completely fine. I’ve made a great crown test, and have successfully cut MDF using the same feeds and speeds, but with the straight cutter.
Any help would be appreciated, thanks,