Tuning for Steppers (Marlin)

timne0

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Jul 7, 2016, 6:34:46 AM7/7/16

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Any tips for tuning?

I've finally got it working using laserweb 2.0 exports, however I get an excellent grinding sound which I assume means belt slipping (though I seem to overstep the finish point, so perhaps it's the step length or sommat)

timne0

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Jul 13, 2016, 4:40:31 AM7/13/16

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Turns out you need jumpers on the drivers on RAMPs. When we worked that out we could increase the steps from 8 to 80.

Whilst we're getting consistent results, we are still getting lovely grinding noises. The jumper issue muddied the waters and took about 5 hours to trouble shoot. I think the issue may lie in what motors and belt our RAMPS is using. It's not particularly obvious what is in the box.

On Thursday, 7 July 2016 11:34:46 UTC+1, timne0 wrote:

otas

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Sep 7, 2016, 3:10:56 PM9/7/16

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Check you stepper motor current, if it is too high, you will hear the grinding - drrrrdrrrr. Reduce current to point where you start loosing steps, than increase it slightly. Look for pololulu stepper motor current adjustment on Ramps14. There is tiny pot to do that. You can get it almost silent.

On Thursday, 7 July 2016 11:34:46 UTC+1, timne0 wrote:

timne0

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Apr 7, 2017, 6:59:50 AM4/7/17

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So almost a year on, we thought we'd solved the issue,but it was still grinding.

Not voltage, still jumper issues

Cheap copies of A4988 pololu drivers (still marked the same) only support 1/8 microstep not 1/16. MS3 on ramps boards literally does nothing. So if you think you've set 1/16, you've actually enabled full stepping. 1/32 (which we had working, sort of) was because it was supporting 1/2 rate stepping, as MS1 and MS3 where MS3 does not work = half step.