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threaded rod steps.

Posted by rohit939

rohit939

threaded rod steps.
April 15, 2017 06:32AM

Registered: 7 years ago
Posts: 6

hello
i want to configure steps in marlin
but dont know how to and what to change.
i am using these threaded rod
[www.ebay.in]?
instead of lead screw, lead screw rods are way more expensive than threaded rod here.
please help.

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Srek

Re: threaded rod steps.
April 15, 2017 09:22AM

Registered: 12 years ago
Posts: 2,470

M8 thread has 1.25mm/1. If you have a standard 1.6° 200 steps/1 stepper motor 1mm will take 160 full steps These 160 full steps need to be multiplied by whatever microstepping you use, if it is 32 you get 5120 steps/mm.

[www.bonkers.de]
[merlin-hotend.de]
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seattle_phil

Re: threaded rod steps.
April 15, 2017 09:13PM

Registered: 7 years ago
Posts: 13

Quote
Srek
M8 thread has 1.25mm/1. If you have a standard 1.6° 200 steps/1 stepper motor 1mm will take 160 full steps These 160 full steps need to be multiplied by whatever microstepping you use, if it is 32 you get 5120 steps/mm.

Um, 360 degrees/200 steps = 1.8 degree/step but otherwise correct.

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rohit939

Re: threaded rod steps.
April 16, 2017 12:53PM

Registered: 7 years ago
Posts: 6

in marlin
its #define DEFAULT_AXIS_STEPS_PER_UNIT {100,100,400,100} // default steps per unit for Ultimaker
i think 400 is for z axis, still dont know what to change ? and what to write
can you guys help me with full calculation method?

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rohit939

Re: threaded rod steps.
April 16, 2017 01:07PM

Registered: 7 years ago
Posts: 6

here's the formula. steps_per_mm = (motor_steps_per_rev * driver_microstep) / thread_pitch
according to this i'm getting 2560 steps so what should i write instead of 400? calculations? and i'm talking about threaded rods not lead screw.

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Srek

Re: threaded rod steps.
April 16, 2017 02:44PM

Registered: 12 years ago
Posts: 2,470

Quote
seattle_phil

Quote
Srek
M8 thread has 1.25mm/1. If you have a standard 1.6° 200 steps/1 stepper motor 1mm will take 160 full steps These 160 full steps need to be multiplied by whatever microstepping you use, if it is 32 you get 5120 steps/mm.
Um, 360 degrees/200 steps = 1.8 degree/step but otherwise correct.

Bugger, it felt off, but i did not see the error. Thanks for the correction.

[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

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alex.me

Re: threaded rod steps.
April 20, 2017 12:51PM

Registered: 7 years ago
Posts: 23

I actually found this [www.prusaprinters.org] googling for an equation to calculate this.

You probably solved it but ... for future refference xD