invDistPerCycle works?

Moderators: TomKerekes, dynomotion

Post Reply
gonzalo
Posts: 12
Joined: Wed Feb 27, 2019 4:03 pm

invDistPerCycle works?

Post by gonzalo » Fri Aug 30, 2019 11:29 am

Hi Tom,

I am triying to calibrate the movement for my setup and I see in the manual the variable invDistPerCycle to do that. I have a regular 1.8º/step motor with KSTEP and I want my units in degres. Then following the example1 of the manual:

Example #1 : A mechanism moves 0.001" for each full step of a step motorIt is desired for commanded distance to be in inches.
Result: One Cycle = 4 full steps = 0.004",Thus InvDistPerCycle = 1.0/0.004 = 250.0 (cycles/inch) Commanding a move of 1.00 will generate 250 sine waves, or the equivalent of 1000 full steps, or one inch of movement..


Then I shoul do like that:

the motor moves 1.8º/16=0.1125º (due the KSTEP microstep) for each full step of a step motor It is desired for commanded distance to be in degrees.
Result: One Cycle = 4 full steps = 4*0.1125º=0.45º,Thus InvDistPerCycle = 1.0/0.45 = 2.22 (cycles/º) Commanding a move of 1.00 will generate 2.22 sine waves, or the equivalent of 8.88 full steps, or one º

Is that correct?. The main problem is that does not matther waht I put in the InvDistPerCycle as always makes the same movement, why can be that?

Many thanks again!!

Gonzalo

User avatar
TomKerekes
Posts: 615
Joined: Mon Dec 04, 2017 1:49 am

Re: invDistPerCycle works?

Post by TomKerekes » Fri Aug 30, 2019 4:55 pm

Hi gonzalo,

The InvDistPerCycle setting doesn't apply to Step/Dir modes. It only applies to the modes where KFLOP is controlling sine wave currents to the motor (SnapAmp).

You can scale movement in Step/Dir mode with the OutputGain setting. With a standard 200 fullstep/rev motor and KStep's 16X microstepping there are 3200 steps/rev. So to scale to degrees:

OutputGain = 3200 steps/rev / 360 degrees/rev = 8.888889

Personally I prefer to leave KFLOP operating in Steps and do any scaling in the PC Application.
Regards,

Tom Kerekes
Dynomotion, Inc.

gonzalo
Posts: 12
Joined: Wed Feb 27, 2019 4:03 pm

Re: invDistPerCycle works?

Post by gonzalo » Mon Sep 02, 2019 9:05 am

Many thanks Tom!! :D :D

Post Reply