Dimensions Slightly Off
- sandersjrs
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15 Jul 2024 17:31 #305252
by sandersjrs
Dimensions Slightly Off was created by sandersjrs
Hello,I recently retrofit an axiom router to use LinuxCNC. Everything works pretty decently. I am running into a problem where the dimensions of parts will be every-so-slightly off, but enough to know it's not just a tolerance problem. I think I've whittled down the problem to movement between cutting operations - when cutting a pocket (for example), the pocket is just the right size. But when it travels to the next operation (drilling a hole for example), the position of the hole will be slightly off from where it should be. Especially on longer parts when the travel is significant, the error is relatively larger. I've tested my stepper settings while setting up, and it jogs the correct distance.
I tried to lower the max velocity and acceleration, thinking that it could be overshooting at the higher travel speeds. This did not change anything (compared to the same part at a higher travel speed). Could it be a latency problem? I do get a latency warning every once in a while. Any other ideas?.hal and .ini files attached.
Let me know if this post should be moved to another category - first time posting here.
I tried to lower the max velocity and acceleration, thinking that it could be overshooting at the higher travel speeds. This did not change anything (compared to the same part at a higher travel speed). Could it be a latency problem? I do get a latency warning every once in a while. Any other ideas?.hal and .ini files attached.
Let me know if this post should be moved to another category - first time posting here.
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15 Jul 2024 22:30 #305287
by cornholio
Replied by cornholio on topic Dimensions Slightly Off
Thoroughly check the mechanical side, like every single component. More often than not that is where the problem is.
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15 Jul 2024 22:56 #305290
by sandersjrs
Replied by sandersjrs on topic Dimensions Slightly Off
It was running very accurately with the old controller (RichAuto B18) - and I did not touch any mechanical components when switching to LinuxCNC. That's why I ruled any bad mechanical components or connections out.
I changed the orientation of the part I was using to test error by 90 deg and got worse error. I may just run through a new setup of LinuxCNC and see if that will fix anything.
I changed the orientation of the part I was using to test error by 90 deg and got worse error. I may just run through a new setup of LinuxCNC and see if that will fix anything.
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16 Jul 2024 00:24 #305301
by cornholio
Replied by cornholio on topic Dimensions Slightly Off
There's something off with your ini & hal files. Both exactly the same size and seem to binary files.
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16 Jul 2024 22:17 #305426
by sandersjrs
Replied by sandersjrs on topic Dimensions Slightly Off
Here is an example of what I am experiencing
. Each run is a different pocket run with the steppers at different microstepping values. Each time the bit goes down to start pocketing a new layer, the edge of the X axis of each is off from where it was from the layer above. What's weird is that each layer is lined up with itself in the X axis.
I'm not getting latency problems. I did input random high values (I think 20000 ns for each field) for the driver setup page because there is literally no information online about that (yes, I did contact the manufacturer - Troy).
I'm about ready to throw in the towel and buy new stepper drivers, but the things is, the drivers worked just fine not one week ago with the old controller.
I'm not getting latency problems. I did input random high values (I think 20000 ns for each field) for the driver setup page because there is literally no information online about that (yes, I did contact the manufacturer - Troy).
I'm about ready to throw in the towel and buy new stepper drivers, but the things is, the drivers worked just fine not one week ago with the old controller.
Attachments:
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16 Jul 2024 22:38 #305427
by cornholio
Replied by cornholio on topic Dimensions Slightly Off
Like I said your hal and ini files are not readable. Please repost them.
What drivers are being used ?
What drivers are being used ?
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16 Jul 2024 22:42 #305428
by PCW
Replied by PCW on topic Dimensions Slightly Off
Losing steps should be quite easy to hear
if you run your program cutting air and with the
spindle off.
To verify that its not a mechanical issue that has crept in,
can you still run the old controller?
if you run your program cutting air and with the
spindle off.
To verify that its not a mechanical issue that has crept in,
can you still run the old controller?
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16 Jul 2024 22:58 - 16 Jul 2024 23:02 #305430
by sandersjrs
Replied by sandersjrs on topic Dimensions Slightly Off
Sorry about the .hal and .ini. Try these:
Drivers being used are old Troy (chinese) drivers (that worked fine with the old RichAuto controller):
User manual here (drive file because it's too large for forum limits): drive.google.com/file/d/1BSWBPFRsO2LLnaD...kK4/view?usp=sharing
I did switch the X and Y axis steppers and the issue still happened on the same axis.
Drivers being used are old Troy (chinese) drivers (that worked fine with the old RichAuto controller):
User manual here (drive file because it's too large for forum limits): drive.google.com/file/d/1BSWBPFRsO2LLnaD...kK4/view?usp=sharing
I did switch the X and Y axis steppers and the issue still happened on the same axis.
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Last edit: 16 Jul 2024 23:02 by sandersjrs.
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16 Jul 2024 23:01 #305431
by sandersjrs
Replied by sandersjrs on topic Dimensions Slightly Off
I can hear steps being lost while it is running, just not sure why they are being lost. I've tried each microstepping value I can, and I get the same problem.
I could try the old controller, but I'd like to do that as a last resort because that would take quite a bit of time to set back up.
I did tighten all mechanical connections.
I could try the old controller, but I'd like to do that as a last resort because that would take quite a bit of time to set back up.
I did tighten all mechanical connections.
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16 Jul 2024 23:27 #305434
by tommylight
Replied by tommylight on topic Dimensions Slightly Off
-set microstepping to 1/4 or 1/8
-set the current .... it can not be set!!!
-set the acceleration in the ini file to 150 or 200 or max 250
-do some tests
Attach pictures of the machine here.
-set the current .... it can not be set!!!
-set the acceleration in the ini file to 150 or 200 or max 250
-do some tests
Attach pictures of the machine here.
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