While cutting huge 1200mm letters from 10mm pvc signage foam on a 16mm thick sacrificial mdf board with a 6mm double flute bit in a router trimmer, I ran into a problem where the cut started going too deep into my backboard and the router started to strain.
I went to “Movement-Override” and looked for a way to simply lift out the bit about 2mm.
I found I could override the feed speed and solved my immediate problem by slowing down the feed.
My question is: Is there a way to lift the bit during the cut, like you can override the feed speed?
as far as im aware no
was it going to deep all over the bed or only in places?
did you surface you your 16mm mdf, what depth of cut do you have your tool set to be going so far into spoil board
the pvc foam ive cut is never a true 10mm , i set my DOC at 11mm i find it gives a clean cut
I throw a 3mm sheet of mdf on top of my spoil board than my sheets that way if it does cut to deep it goes into that and not my true spoil board also when taking screws out of mdf top always pops but with the 3mm sheet it doesn’t pop ur true spoil board
what machine are you running , have you checked your Z heights on both sides
Thank you for the advice.
No, I did not surface the spoilboard as I did not have a skimming cutter and working against a deadline with 4 sheets to cut lettering out of 4 full sheets
I was well aware that the table was not level. It was higher the whole width of x-axis for about half the board in the center by about 5mm.
My choices were to probe in the middle or near home. I did the first board accepting the 5mm deep cut into the spoilboard and working at a lower spead. I did the rest probing in the center and accepting that I had to trim about half the letters with by hand, but at a much higher speed.
It would have been nice to be able to lift the cutter out a little at the higher area and lower it again when past.
On Lightburm there is a feature that allows you to stop the job and restart from anywhere in the preview if you need to interrupt the work, but i cant find this feature in Millmage.
oh 5mm yeah thats alot
You are unable to do that with MM as a cnc coding is diffrent this has been ask many time, try searching pause mid job on the forum page .
i have aauctually given up probing on top of material due to its variance i find it easier to have a set position on table to probe from everything , i have it set up in the go to menu and in toolchange custom gcode
As far as I’m aware there are no commands in GRBL to adjust the Z axis height during a run.