Rotary Axis questions.

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xbartx
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Rotary Axis questions.

Post by xbartx »

When looking at the manual I see details on setting up for linear axis, what do I do about Overall Turns ratio values and Software Travel Limits for a rotary axis.
My stepper motor to Rotary tool turret is 30:1
-Brad


cncsnw
Posts: 4200
Joined: Wed Mar 24, 2010 5:48 pm

Re: Rotary Axis questions.

Post by cncsnw »

The turns ratio should be the number of stepper motor revolutions for one degree of table rotation. Usually this will be a number significantly less than 1.0

If your reduction is 30:1, then one revolution of the servo motor is 1/30 of a table revolution, or 12 degrees. So your turns ratio would be 1/12 motor turn per degree, or 0.083333.

A typical rotary table is mechanically capable of unlimited rotation, and so should have no software travel limits. In that case you would leave both limits equal to zero.

If it is a tilt table with clear limits; or if it carries a wired component and so had travel limited by the wiring harness, then you should enter travel limits, in degrees plus and/or minus from Home.


xbartx
Posts: 35
Joined: Thu Sep 12, 2024 2:09 pm
Acorn CNC Controller: Yes
Plasma CNC Controller: No
AcornSix CNC Controller: No
Allin1DC CNC Controller: No
Hickory CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: Yes
Location: So. Oregon

Re: Rotary Axis questions.

Post by xbartx »

cncsnw wrote: Mon Nov 11, 2024 8:00 pm The turns ratio should be the number of stepper motor revolutions for one degree of table rotation. Usually this will be a number significantly less than 1.0

If your reduction is 30:1, then one revolution of the servo motor is 1/30 of a table revolution, or 12 degrees. So your turns ratio would be 1/12 motor turn per degree, or 0.083333.

A typical rotary table is mechanically capable of unlimited rotation, and so should have no software travel limits. In that case you would leave both limits equal to zero.

If it is a tilt table with clear limits; or if it carries a wired component and so had travel limited by the wiring harness, then you should enter travel limits, in degrees plus and/or minus from Home.
Thanks for the info!
No limits, it is a tool turret. At some time I will have to figure out how to set it up properly, for now just trying to get it running.


cncsnw
Posts: 4200
Joined: Wed Mar 24, 2010 5:48 pm

Re: Rotary Axis questions.

Post by cncsnw »

For a tool turret, I typically set it up so that one unit of measure is one tool, rather than one degree.

In that case your turns ratio would be motor revs per tool position; your jog and rapid rates would be tools/minute; etc..

You can certainly use degrees as well; it just makes the tool-change macro a little less intuitive.


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