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steps per mm help[SOLVED]

Posted by chris33 
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chris33
steps per mm help[SOLVED]
June 03, 2013 02:13PM
hi i have m5 for my z axis now in the josef prusa calculator i put it in the lead screw bit

Motor step angle 1.8 Driver microstepping 1/16

Leadscrew pitch 0.8 Presets m5 - metric(0.8mm rotation) mm/revolution

Gear ratio
1 : 1
Motor : Leadscrew (1:1 for direct drive - Prusa)
comes to 4000.0 that definatly not right what am i missing?

Edited 2 time(s). Last edit at 06/03/2013 06:36PM by chris33.
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Myles
Re: steps per mm help
June 03, 2013 02:20PM
Not sure if understand what you are asking, but if it is Z steps, then
1 revolution of the stepper motor is 3200 steps divided by the pitch
So 3200 / 0.8 = 4000
Hope this helps

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chris33
Re: steps per mm help
June 03, 2013 02:22PM
i thought stepper is 200 steps per 1 rotation
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chris33
Re: steps per mm help
June 03, 2013 02:24PM
so have i answered my own question
250 then 200/0.8=250
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Myles
Re: steps per mm help
June 03, 2013 02:24PM
Multiplied by the 1/16 micro steps I think
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chris33
Re: steps per mm help
June 03, 2013 02:27PM
nope thats for 1 full step but 1/16 is 4000 tried that motors squealed so that means ill need too run more current too them?
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Myles
Re: steps per mm help
June 03, 2013 02:29PM
1.8 degree angle gives 200 steps and then 1/16 micro steps gives 3200

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Myles
Re: steps per mm help
June 03, 2013 02:34PM
Nema 17 motors I think is 0.6 to 0.8 volts
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chris33
Re: steps per mm help
June 03, 2013 02:37PM
so my vref is at 0.4amps if i put it too 1amps will get rid of the squeal cos putting the steps at 4000 on z makes them squeal
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chris33
Re: steps per mm help
June 03, 2013 02:38PM
these are the motors


Part No.: 42BYGHW811
Frame Size: NEMA17
Step Angle: 1.8 degree
Voltage: 3.1V
Current: 2.5 A/phase
Resistance: 1.25Ohm/phase
Inductance: 1.8mH/phase
Holding torque: 70oz-in
Rotor inertia: 68g-cm2
Detent torque: 280g-cm
Number of wire leads: 4
Weight: 0.34 kg
Length: 48mm
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Myles
Re: steps per mm help
June 03, 2013 02:45PM
Sorry , electronics is not my strongest and I would hate for you to burn something out on my advice.
I used these instructions when I built my Mendel, [reprap.org]
Good luck
Edit, I did not mention Amps, I said 0.6 to 0.8 Volts

Edited 1 time(s). Last edit at 06/03/2013 03:00PM by Myles.

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miso
Re: steps per mm help
June 03, 2013 05:16PM
Have you tried reducing speed on Z axis? If it worked before without squeal, try multiplying it by factor (old steps per mm)/(current steps per mm).
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chris33
Re: steps per mm help
June 03, 2013 05:34PM
its 5 mm/sec
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