Hello,
I'm building a Rostock and using Ramps 1.4 + DRV8825 Drivers.

The default micro stepping in this board is 1/16 .
DRV8825 support 1/32 micro stepping.

When I configed my rostock to 80 steps per mm it moved half than it should move. When I change is to 160 steps per mm it was good.

It looks like the default micro stepping with these drivers is 1/32 and not 1/16, am I correct?

If i'm wrong, how can I change it to 1/32? because there is not refference about at the Ramps 1.4 page [reprap.org]

Edited 1 time(s). Last edit at 08/20/2013 06:00PM by itaysp.

Quote

If i'm wrong, how can I change it to 1/32?

Don't, because many people still use Allegro-based Pololus. Steps/mm have to be adjusted for each individual printer. There's no way around it.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

You either only use the last jumper of the three to set the steper to 1/16 or you configure your firmware as you have done it.

I use the 8825 on my z axis at 1/32 and the other three axis have the 4988 at 1/16. The jumper settings remain the same, all closed. Go to digikey and and download the datasheet. So yes, itaysp your original assumption was theoretically correct. Even so, Traumflug is right, you're going to have to recalibrate it.