Is positioning mode or torque mode better?

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tblough
Posts: 131
Joined: Tue Mar 22, 2016 10:03 am
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Is positioning mode or torque mode better?

Post by tblough » Sun Feb 12, 2017 4:35 pm

I have two ABB Microflex drives and motors that I will be connecting to an Oak controller on a small Hardinge lathe. The Microflex can run in positioning (step/dir) , torque/current (0-10V), or velocity (0-10V) modes. Which mode will give me the better results? Will it make a difference if in the future I add glass scale feedback to the X-axis?
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.

cnckeith
Posts: 606
Joined: Wed Mar 03, 2010 4:23 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: Yes
DC3IOB: Yes
CNC11: Yes
CPU10 or CPU7: Yes
System Serial Number: none
Contact:

Re: Is positioning mode or torque mode better?

Post by cnckeith » Mon Feb 13, 2017 3:29 pm

the oak board doesn't output step and direction..so that's out.
i'd go for the velocity mode.
what is your goal with the hardinge? super accurate production machine? or occasional use in the garage?

cncsnw
Posts: 355
Joined: Wed Mar 24, 2010 5:48 pm

Re: Is positioning mode or torque mode better?

Post by cncsnw » Mon Feb 13, 2017 8:32 pm

... but if you do want to run positioning mode, the Oak will output a pulse train signal (A and B channels). Many drives will accept that as an alternative to step and direction.

tblough
Posts: 131
Joined: Tue Mar 22, 2016 10:03 am
Acorn CNC Controller: No
Allin1DC CNC Controller: Yes
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: Yes
DC3IOB: No
CNC11: Yes
CPU10 or CPU7: No
System Serial Number: 100505
100327
102696
Location: Boston, MA
Contact:

Re: Is positioning mode or torque mode better?

Post by tblough » Tue Feb 14, 2017 6:00 pm

CNCSNW,

I don't know why I didn't notice that. I had originally intended to hook it up in velocity mode and noticed the microflex drive had multiple modes and I remember seeing the Oak board had multiple modes, just didn't bother to check if the multiple modes matched. Sorry for wasting your time.

In answer to your question, this will be for a super accurate prototyping machine/short-run production.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.

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