"Z axis Max Rate Exceeded" error

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martyscncgarage
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"Z axis Max Rate Exceeded" error

Post by martyscncgarage »

Friends machine.
Machine Specifics:
3 Axis CNC Knee Mill
Acorn driving closed loop DC Brushless servos
Durapulse GS3 VFD Low RPM tuned to within 20rpm of commanded speed.
100 Renco Line Driver/Differential Encoder its what he had. We thought we would give it a go.
CNC12 P34 = -400.00000 - Spindle Encoder Counts/Revolution (Verified 400 counts to one turn of the spindle on the PID screen)
Rigid tapping settings are all pretty much the default settings.


Issue:
When trying to run a tapping cycle created with Intercon
When it gets to the G84 X0.0 Y0.0 Q0.313 Z-0.9 R0.1 P0.10
Line, the control faults with a "Z Axis Max Rate Exceeded" and a 330 Canned Cycle Error:
Beevo Screen Shot.JPG
Normally, yes, we would run a 1000line encoder. Is the "Z Axis Max Rate Exceeded" error a direct result of the low encoder count or something else?
Thanks in advance.

Marty
Attachments
report_3403DE6533A0-1120192697_2021-05-30_13-12-13.zip
(770.4 KiB) Downloaded 6 times
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Mesa, AZ
Dave_C
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Re: "Z axis Max Rate Exceeded" error

Post by Dave_C »

Z axis max rate is set to 20 but not sure what the thread pitch is that you are cutting. Maybe 20 is too low?

Dave C.
Grizzly G0678 Mill ,CNC conversion with Acorn. G4004G Lathe, Mach 3 conversion to Acorn.
cnckeith
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Re: "Z axis Max Rate Exceeded" error

Post by cnckeith »

the programmed pitch and rpm determine the Z axis speed that the machine needs to move, the error message is saying the the machine configuration Z axis rate is lower than the programmed pitch and rpm need for the tap to move up and down the hole without breaking it.

so pitch could be wrong, RPM too high or Z max rate too low. and has nothing to do with the encoder counts.
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
martyscncgarage
Posts: 8441
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
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MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: "Z axis Max Rate Exceeded" error

Post by martyscncgarage »

cnckeith wrote: Sun May 30, 2021 8:08 pm the programmed pitch and rpm determine the Z axis speed that the machine needs to move, the error message is saying the the machine configuration Z axis rate is lower than the programmed pitch and rpm need for the tap to move up and down the hole without breaking it.

so pitch could be wrong, RPM too high or Z max rate too low. and has nothing to do with the encoder counts.
AH! (Slaps self on the side of head!) :)

24TPI thread

Axis Slow Jog Fast Jog Max Rate Deadstart Delta Vmax
(in/min) (in/min) (in/min) (in/min) (in/min)
1 20.0000 20.0000 75.0000 5.0000 5.0000
2 20.0000 20.0000 75.0000 5.0000 5.0000
3 10.0000 10.0000 20.0000 5.0000 5.0000

Also a couple other things don't look right now that I look at his report...will investigate further.
Thanks Dave_C & Keith!
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
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BrianL
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CNC Control System Serial Number: 100247

Re: "Z axis Max Rate Exceeded" error

Post by BrianL »

Your program feed rate is for 32 pitch, not 24. Can't help with the rest, but at 640rpm you are only moving 20ipm.
martyscncgarage
Posts: 8441
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: "Z axis Max Rate Exceeded" error

Post by martyscncgarage »

We resolved the issue
Working on correcting the encoder counts in the Logosol drives. Then he'll fix the turns ratio. Well then bump up the max feed rates.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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