Why does my machine go berserk on the final pass, with only seconds left. I’ve had this happen several times on other projects , always on the final pass. There were no obstructions
I’ve had this happen when the Z axis has hit something that will cause it to loose stepper counts. Typically it is the dust boot hitting a hold down. However, that does not look like what I am seeing here. Sorry, no help.
Are you cutting a slot just as narrow as the tool?
The new beta adds a “Cutout” toolpath to handle this where a second pass will be added when needed:
For an example of using this, see:
There were no obstruction or obstacles. .25 depth of cut each pass using using IDC 1/4” beast bit at 80 inches
I downloaded the beta version and I see the new tool path. I canceled the contour and used the cutout path but it seems to eliminate the tabs when I show simulation
Export the Gcode from CM and view it in ncviewer of something like it.
Just to confirm if the tool path was generated as expected.
Can you share the C2D file?
read Will Adams post and act accordingly: always if ever possible use a pocket cut instead of a contour. The deeper the whole cut is -not just the pass’ depth- the more chips get crammed, holding the bit from moving. That is worse with downcut bits or compression bits since they do not get the chips out, but also happens with upcut bits.
Now: do not understimate the power of a power tool: the cutting edge of an upcut bit cuts up the wood, but the edge pulls the bit down, out of the collet. Now it gets deeper and deeper every second, causing a much deeper cutting path, and of course much higher resistance against the feed, what the machine does not have the power to overcome, and thus it misses steps.
GL with your next attempt!
And don’t forget the hardness of the wood. The bamboo boards from CIC are excellent, unique stuff. But it is harder than oak. Speeds and feeds need to be adjusted accordingly.
Carbide Create, in the latest beta:
has a new toolpath, “Cutout”, which avoids the need to “add offset geometry and cut as a pocket down to tab height”:
which automatically, or when directed to will cut wider in multiple passes:
(but be careful w/ tabs — I misunderstood the UI and failed to test w/ tabs 'cause I’ve been on a belt-and-suspenders kick of using blue painter’s tape and cyanoacrylate glue w/ clamps so that no tabs are needed, but am going to be switching that up presently…)
I’m sure that @WillAdams has seen this thread
https://community.carbide3d.com/t/considerations-when-cutting-slots/102526/11?u=jeffish
Rob replied that the lack of tabs across the wide cutout toolpath will be addressed
I have issues when the depth of cut is more than the machine can handle. Z will go berserk going off path and maybe plunging into the work.
I also experienced problems with the tightness of the end mill if not changed or checked from the last job. It will get loose and mess with Z.
The new Cutout toolpath will help a great deal in deep cuts.
Hey Will…I must have missed the write up on the new Cutout tool. Is there something written up about what the parms mean and how it’s used?
I was just experimenting to see if I could figure out what was going on, and I don’t see any differences when playing with the Breakthrough parameter…and I don’t know why I’d need to use “Wide” to do a cutout…as that’s just wasted time and wood anyway…no?
If there’s a thread on it, I wasn’t able to find it (I did search first)…can you point me to it, if it exists?
D’anka.
There is a little bit at:
which I’ll fill in w/ my understanding presently.
OK…I’ll keep an eye out there. Seems, “young”.
