OK maybe this was too aggressive even for Adaptive Clearing ;)

[Washout]

Hi Chaz - that was the 2.2KW water-cooled variant.

As Jazz says if the bed was moving and allowing the cutter to take more than the desired 3.2mm then that might account for the spindle cut out. I've generally found that 8mm tools tend to survive very rough treatment, whilst 6mm and below don't. Last time I used an 8mm when something went wrong it welded itself into the plate and the machine then started walking itself off the table under spindle power, which was pretty scary, but the tool stayed intact.

I was even more grateful this time that the part wasn't ruined as I'd just finished cutting on the underside (hence the 4 hold down screws). This was the "cut out" toolpath in essence.

[Chaz]

Hi Chaz - that was the 2.2KW water-cooled variant.

As Jazz says if the bed was moving and allowing the cutter to take more than the desired 3.2mm then that might account for the spindle cut out. I've generally found that 8mm tools tend to survive very rough treatment, whilst 6mm and below don't. Last time I used an 8mm when something went wrong it welded itself into the plate and the machine then started walking itself off the table under spindle power, which was pretty scary, but the tool stayed intact.

I was even more grateful this time that the part wasn't ruined as I'd just finished cutting on the underside (hence the 4 hold down screws). This was the "cut out" toolpath in essence.

Awesome.

As soon as I get my misting system working on my little Denford, I want to do the same. I am however limited to about 4400 RPM via a 1.5KW AC Servo, so my level of adaptive is not the same but Im keen to see how far I can push.

[JAZZCNC]

Awesome.

As soon as I get my misting system working on my little Denford, I want to do the same. I am however limited to about 4400 RPM via a 1.5KW AC Servo, so my level of adaptive is not the same but Im keen to see how far I can push.

Use larger cutter if possible and you'll stand more chance. Smaller cutters need the high rpm and will fail quickly if run with low rpm at high feeds.

[Chaz]

Use larger cutter if possible and you'll stand more chance. Smaller cutters need the high rpm and will fail quickly if run with low rpm at high feeds.

Currently use 8mm roughing and 10mm finishing end mills. I think Ive got a 10mm roughing one I can try.

[Chaz]

Use larger cutter if possible and you'll stand more chance. Smaller cutters need the high rpm and will fail quickly if run with low rpm at high feeds.

So I managed to get one set of cuts done and then snapped an 8mm roughing mill on the 2nd try.

Just uploading the vids now.

[Chaz]

Details there, 4K RPM, 1250 mm/min, 3 flute 8mm roughing mill. DOC 10mm, WOC 1mm.

[Chaz]

And then failed attempt. Surprised by the endmill snapping. Expected more but I am severely limited by RPM. Sorry. the Youtube info isnt shown unless you watch it there but its at 1500mm/min.

[JAZZCNC]

And then failed attempt. Surprised by the endmill snapping. Expected more but I am severely limited by RPM. Sorry. the Youtube info isnt shown unless you watch it there but its at 1500mm/min.

That looks like drove the tool into material on positional move rather than trying to take cut. Did you simulate the toolpath to check for any crashes.?

[Chaz]

That looks like drove the tool into material on positional move rather than trying to take cut. Did you simulate the toolpath to check for any crashes.?

Its the same path as the previous cut. The first one was done a bit slower. The stock dimensions are less than what was programmed, that's why it cuts a bit of air but it does look like it 'plunged' but it did path is the same cut as the first vid (just reset the zero and went again).

[Chaz]

I think I have another 8mm roughing mill. Will setup a toolpath that that goes around the square with constant contact and see how that works.