Jumping Z axis when homing!

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toolmaker101
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Re: Jumping Z axis when homing!

Post by toolmaker101 »

Well I got an error this morning. I just reset it and turned the feed down. and re-homed it.
I did Pump a lot of way lube out the Z slide just to check that.
I will reset tools I will be using to ensure correct offset.
Attachments
error.jpg
martyscncgarage
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Location: Mesa, AZ

Re: Jumping Z axis when homing!

Post by martyscncgarage »

You might consider lubricating/replacing the Z+ home/limit switch. Make sure it is a little lower than the hard stop.
That "differs by X number of counts" is that the last time the control stored the number of counts between when the mechanical switch was tripped and the Z axis encoder index has changed by the number of counts displayed. Make sure mechanically all pulleys and belts are snug.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
tblough
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Re: Jumping Z axis when homing!

Post by tblough »

You might also run into this if your Z encoder index pulse is close to where your limit switch actuates. If this is the case, simple things like temperature difference can affect where your limit switch trips by a small amount making what used to be a small turn to the encoder pulse now almost a full turn.

The fix is easy - just disconnect your motor from the ballscrew and rotate the motor 1/2 turn and reconnect it. You'll get the encoder counts message the first time you home it afterwards, say yes, and hopefully you'll never see the message again.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
martyscncgarage
Posts: 9140
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC 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: Jumping Z axis when homing!

Post by martyscncgarage »

I just looked at the SYSTEST.OUT file found in the report. ASSUMING these are the results of your Systemtest conducted on 1/4/2018
Seems as it never passed the system test. So you are probably getting a white box on power up saying System test not completed and to Contact your dealer?

Here is your SYSTEST.OUT file:

-------------------------------------------
Starting system test
-------------------------------------------
Version Information
$Id: systest.cnc,v 1.1.1.1 2006/01/05 14:30:21 kdennison Exp $
;;;;;;;;;;;;;;;;;;;;;;;
System is NOT configured for ATC

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Checking travel limits and home set
Travel limits set and machine is homed.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Starting home switch testing
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 1 minus
1 / 8 turn distance is 0.0246
7 / 8 turn distance is 0.1722
full turn distance is 0.1969
Off switch| error | home | error | differnce
-0.1290 0.0000 0.0000 0.0000 0.1290
Off switch Max Min Difference
-0.1290 -0.1290 0.0000
home posiiton Max Min Difference
0.0000 0.0000 0.0000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 1 plus
1 / 8 turn distance is 0.0246
7 / 8 turn distance is 0.1722
full turn distance is 0.1969
Off switch| error | home | error | differnce
39.6927 0.0000 39.5675 0.0000 0.1252
Off switch Max Min Difference
39.6927 39.6927 0.0000
home posiiton Max Min Difference
39.5675 39.5675 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 39.5674
-Distance between travel limits is 39.6250
-Difference between distances is -0.0576
*** FAILURE Travel limits set incorrectly
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 2 minus
1 / 8 turn distance is 0.0246
7 / 8 turn distance is 0.1723
full turn distance is 0.1969
Off switch| error | home | error | differnce
-19.5429 0.0000 -19.4909 0.0000 0.0520
Off switch Max Min Difference
-19.5429 -19.5429 0.0000
home posiiton Max Min Difference
-19.4909 -19.4909 0.0000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 2 plus
1 / 8 turn distance is 0.0246
7 / 8 turn distance is 0.1723
full turn distance is 0.1969
Off switch| error | home | error | differnce
0.0800 0.0000 -0.0000 0.0000 0.0800
Off switch Max Min Difference
0.0800 0.0800 0.0000
home posiiton Max Min Difference
-0.0000 -0.0000 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 19.4909
-Distance between travel limits is 19.4770
-Difference between distances is 0.0139
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 3 minus
1 / 8 turn distance is 0.0116
7 / 8 turn distance is 0.0811
full turn distance is 0.0926
Off switch| error | home | error | differnce
-19.7498 0.0000 -19.6715 0.0000 0.0782
Off switch Max Min Difference
-19.7498 -19.7498 0.0000
home posiiton Max Min Difference
-19.6715 -19.6715 0.0000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 3 plus
1 / 8 turn distance is 0.0116
7 / 8 turn distance is 0.0811
full turn distance is 0.0926
Off switch| error | home | error | differnce
0.0722 0.0000 0.0604 0.0000 0.0118
Off switch Max Min Difference
0.0722 0.0722 0.0000
home posiiton Max Min Difference
0.0604 0.0604 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 19.7320
-Distance between travel limits is 19.6500
-Difference between distances is 0.0820
Finished testing home/limit switches
*** FAILED SYSTEM TEST ***
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
cncsnw
Posts: 2331
Joined: Wed Mar 24, 2010 5:48 pm

Re: Jumping Z axis when homing!

Post by cncsnw »

Note that the reason for failing the system test was an X travel limit 0.057" too long, and not the marginal Z+ homing search distance.
martyscncgarage
Posts: 9140
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC 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: Jumping Z axis when homing!

Post by martyscncgarage »

cncsnw wrote: Mon Nov 22, 2021 10:48 pm Note that the reason for failing the system test was an X travel limit 0.057" too long, and not the marginal Z+ homing search distance.
Yes, I failed to mention that....
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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