Hello
Is it possible to compensate backlash in just one direction? negative or positive Z direction
I want to mount steppermotor to the quillfeed on my mill and got backlash just in one direction because of springload/tention on the quill feed axel.
I know it is not the best solution, but i will mount Z feed on the knee at a lather stadium.
Btw it is a Bridgeport j-head mill
BR Christian
Backlash compensation
Moderator: cnckeith
-
- Posts: 9
- Joined: Sun Apr 12, 2020 5:34 am
- Acorn CNC Controller: Yes
- Allin1DC CNC Controller: No
- Oak CNC controller: No
- CNC Control System Serial Number: 0479B7ABD46B-0319203088
- DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
Backlash compensation
Bridgeport J-head retrofit
Just for fun
Just for fun
-
- Posts: 3072
- Joined: Tue Mar 22, 2016 10:03 am
- Acorn CNC Controller: Yes
- Allin1DC CNC Controller: Yes
- Oak CNC controller: Yes
- CNC Control System Serial Number: 100505
100327
102696
103432
7804732B977B-0624192192 - DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
- Location: Boston, MA
- Contact:
Re: Backlash compensation
Yup. Backlash tables have independent values for positive and negative directions.
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.
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.
-
- Posts: 728
- Joined: Mon Feb 19, 2018 2:52 pm
- Acorn CNC Controller: Yes
- Allin1DC CNC Controller: No
- Oak CNC controller: No
- CNC Control System Serial Number: 38D269594F9C-0110180512
- DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
- Location: UK
- Contact:
Re: Backlash compensation
Thinking about the physics of this situation, presumably the effect is not backlash as such - more likely to be either stiction and/or elastic behaviour. Interesting to understand how backlash would be different in 2 directions.....
-
- Posts: 366
- Joined: Tue Dec 11, 2018 4:03 pm
- Acorn CNC Controller: Yes
- Allin1DC CNC Controller: No
- Oak CNC controller: No
- CNC Control System Serial Number: F045DA80C8B8-0905181172
E415F6F70BC3-0318203049
98F07B91FC6B-0123236802 - DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
- Location: UK
Re: Backlash compensation
If you intend putting the quill under stepper powered axis control, surely you no longer need a strong spring return as the stepper will lock the quill in any position when at rest. This renders the return spring redundant and the quill may or may not be to one side of the lash. In that case, adjust the spring tension to achieve approx neutral buoyancy. You can and should then set the backlash in the conventional way
Hope this helps
Hope this helps
"You can lead a horse to water but you cannot force it to drink"
Hope this helps
Nigel
Hope this helps
Nigel