Hi, I’ve recently completed construction of the burly mpcnc and until today was having no problems. It works great cutting vinyl and foam, wood not so much. I’ve been trying to run a linear pocketing operation in estlcam to take 3 mm off a sheet of aspen wood. The cuts start great with nice chips but inevitably either the z-axis or the endmill (probably endmill) begins to drop. The dropping accelerates rapidly and within about 15 seconds of it starting the endmill gets stuck deep and yanked out of the chuck. I can now recognize when it begins and stop the cutting in time before things get extreme.
The endmill I am using is the single flute upcut from this set:https://www.amazon.com/gp/product/B07FGFHTG8/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
(I found the fluted section to be 3mm and the shank 3.18 mm)
My machine dimensions are 3’x2’x3’’ and I’ve made sure everything is tight, especially cranking down on the chuck. I’m using the Dewalt 660 router.
These are my latest settings, I’ve also tried at 2mm and 1mm depth per pass with similar results: endmill drops-> chips fail to clear-> endmill gets stuck.
Pictured are some failed 3mm cuts, the gouging sideways only happens when the endmill is barely hanging on to the chuck, the bottom cut was done first.
Frankly, I’m amazed the endmills don’t just snap when this happens but they still seem ‘good’ as new so I’d appreciate any advice you could give me to get things cutting right, thanks.