Can anyone tell me why my CNC is supper choppy running clockwise but smooth as butter running counterclockwise? I have a X50 Elite Forman with a PWN 1.5KW air cooled spindle. And I don’t know what other information is relevant. Just want to see if anyone is having this same issues?
Hey KnotAproblem,
do you mean the direction of the spindle? Or the direction of the toolpath when milling a circle?
Milling bits have flutes in one direction so work only in one direction.
Or do you mean Conventional milling vs. climb milling?
Note that when a three-phase induction motor has two wires exchanged it runs in the other direction.
Welcome to the forum!
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Hi and thanks for responding. I am running a conventional cut with the spindle running in a normal direction. When I area clearance a ring using I believe Raster is going back and forth around the inner portions of the ring. Then it has to clean the outer and inner perimeter. When cutting the outside of the ring it runs counters clockwise to feed into the cutting portion of the bit. When cleaning the inner edge of the ring the machine runs clockwise in order to feed into the cutting edge of the bit. When doing the clockwise rotation it is very choppy.
Does the “choppiness” occur only when machining a workpiece, or does it also happen when air-cutting (no workpiece)?
Even when cutting air it’s super choppy. I would share the video but it won’t let me. It’s smooth one way and it’s like it has hiccups when traveling the other way.
It may be due to the radius of the cut, rather than the direction of the cut. If you change from a conventional cut to a climb cut, that will reverse the directions.
If you still have the chattering at the inside diameter after reversing the directions, try lowering your junction acceleration from 200,000 to 100,000. That will force the system to take the curve at a lower velocity, and give the processor more time to process the motion segments. I found that the buildbotics controller couldn’t process them fast enough when I was doing small-diameter circles and helixes. That phenomenon is known as “data starvation”, or “controller overload”.
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That you so much for your help. I will try that. Will those be setting I make when creating my tool path or is that a system setting in my F1 screen on the masso unit?
Thank you. Sorry my last comment auto corrected to that.
Sorry, I thought you had an original/pro machine with a Buildbotics controller. As far as I know, the Masso controllers aren’t exhibiting the data starvation or controller overload problem. At least, I hope not … that’s one of the major reasons I upgraded my machine to an Elite!
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Here is the video clip I took of it cutting air. If this helps you understand what it’s doing. You can clearly see it here but it much worse when I have material on the bed.
(attachments)
Hey KnotAproblem,
have you ensured that your machine is accurately rectangular (“squared”) and coplanar (“not twisted”)?
Also Onefinity provides a help document which deals with many kinds of blocking of an axis:
I would check all points one by one to see why your carriage moves so strangely.
Besides this, there are three causes that are not mentioned in the document above:
- Should your machine not be properly rectangular (“squared”), the Y movement can stutter or even block.
- And the second possible cause not mentioned in the document above is: This mysterious issue some time ago.
- Electromagnetic interference (EMI), as e.g. mentioned here.
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I just checked my Square/Coplanar again and if I’m off it like a 32nd off which I would assume should be ok. I suppose I could dial it better but wouldn’t that cause it to be choppy in both directions?
Thanks again for all the advice. I, going to check out the articles you sent me.
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