RAMPS 1.4 1/32 micorstepping?

[madfrankie]

Hi Quentin,

Having read through your blog I have become slightly confused with the electronics.

You are using a RAMPS 1.4 board with Pololu DRV8825 and I also remember reading 0.9 deg stepper motors.

I have unsuccessfully been able to google if the RAMPS can run 1/32.

Could you let me know if you are running 1/16 or 1/32? If 1/16 are the components for a future update?

Many Thanks

Sean

[RobertKuhlmann]

I have unsuccessfully been able to google if the RAMPS can run 1/32.

Why shouldn’t it? I thought the difference is, that one stepper type needs 200 steps for a full turn, the other needs 400. Ramps doesn’t “know” that. It just triggers the motor n-times if the software tells it so.

[Quentin Harley]

Ramps does not control the uStepping by itself. It only sets the flags for the drivers. If you have DRV8825 drivers, you would get 32 uStepping when all the tabs are installed.

[Earsmith]

Ah, ha….. Found it or might I say that confirms it.
I know the post is old but might help others with .9 stepper questions. The .9 stepper should not be confused with the half stepping proposed by some on the 1.8 motors by lowering the power to the stepper every other command, pulse or flag, to ‘simulate’ .9 stepping. On the POLOLU website it says High, High, High. With all the “tabs” installed. Meaning the full power will be sent to .9 motor for each step. Rather than half current every other step on a 1.8 to try and achieve .9 resolution. Know Im repeating my self but for the rest of us who are kinda thick it helps to repeat.
Wow what a learning curve. Going to try some hybrid steppers on the arms. Already posted the specs here. Ordered the Pololu DRV8824 to control them. The Hybrid stepper only pulls 600ma and the step stick supposedly‎ will choose high decay for lower power steppers. Will post on results but it will be some time out before vitamins can be installed.

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