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DRV8825 step problems

oldtimmer

DRV8825 step problems
July 05, 2020 05:46PM

Registered: 6 years ago
Posts: 26

Setup
Board: Re-Arm-Ramps 1.4
Firmware: Marlin 2.0.5.3
Stepper Drivers: DRV8825 on X Y Z E0 E1

The problem I am having is X and Y are running at 32 step
But Z E0 and E1 are running at 8 Step

Here are me Configuration.h and my Configuration_adv.h

Configuration.h
Configuration_adv.h

All jumpers are in place.
stepper driver are set to DRV8825 in marlin.
Any suggestions would be helpful.
Thank you

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dustinoff

Re: DRV8825 step problems
July 05, 2020 06:15PM

Registered: 3 years ago
Posts: 29

The problem I am having is X and Y are running at 32 step
But Z E0 and E1 are running at 8 Step

How do you know this?
I don't remember my h/w configuration, but I think all jumpers are out and the 8825 defaults to 32. Then you figure your s/mm and set that in your config.
The numbers for Z E0 & E1 look a little high compared to mine.
1600 vs 800 and 1000 vs 176.

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oldtimmer

Re: DRV8825 step problems
July 05, 2020 06:57PM

Registered: 6 years ago
Posts: 26

My Z screws are Tr8 x 2
If I set Z steps to 800 and I move Z 10 it Moves 10mm
If I set Z steps to 3200 and I move Z 10 it moves 40mm

E0 and E1 direct drive
If I set steps to 200 and move 10mm it moves 10mm
If I set steps to 800 and move 10mm it moves 40mm

According to ramps jumper settings for DRV8825
MS1 = 1 MS2 = 1 MS3 = 1

Also the setup is a CoreXY

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Dust

Re: DRV8825 step problems
July 06, 2020 02:37AM

Admin
Registered: 13 years ago
Posts: 7,000

Micro stepping jumpers for DRV8825 (Jumper on == High)

f8_800x400.jpg

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Dust

Re: DRV8825 step problems
July 06, 2020 02:39AM

Admin
Registered: 13 years ago
Posts: 7,000

Check you jumpers actually has bits of metal in them. some can lose the metal and look fine from the outside.

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oldtimmer

Re: DRV8825 step problems
July 06, 2020 02:45AM

Registered: 6 years ago
Posts: 26

Checked all jumpers and all have there metal inserts.
Tried a new DVR8825 in Z no difference
checked all wires for correct wiring and damage all good.
Tried removing all jumpers on E0 no difference with or without jumpers.
I am lost and quit frustrated.

Edited 2 time(s). Last edit at 07/06/2020 02:47AM by oldtimmer.

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oldtimmer

Re: DRV8825 step problems
July 06, 2020 03:15AM

Registered: 6 years ago
Posts: 26

E0 and E1 are moving at 32 step.
Found the formula to calculate the starting extruder mm/ss came out to 203 for 32 step.
Repetier Host lead screw calculator for Tr8x2 1.8 1/32 should be 3200 but it will only run correctly at 800 witch is 1/8.
I will try replacing the jumpers with new ones.
Thank you for the help

Edited 1 time(s). Last edit at 07/06/2020 03:16AM by oldtimmer.

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dustinoff

Re: DRV8825 step problems
July 06, 2020 11:46AM

Registered: 3 years ago
Posts: 29

OK, it appears you have been caught by the lead screw monster.

an 8x2 screw rises 8mm/rev
each rev = 200 steps for a 1.8° stepper
32 microsteps == 6400 steps/rev
6400/8=800 steps/mm

So your setting should be the same as mine == 800

StepsPermm.JPG

You can download the file here = 2nd post on page.
[www.machsupport.com]

The E settings are best done empirically. I run mine 400mm and measure how much comes out then figure s/mm

Edited 1 time(s). Last edit at 07/06/2020 12:10PM by dustinoff.

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3D-Freak

Re: DRV8825 step problems
July 07, 2020 12:05PM

Registered: 3 years ago
Posts: 14

Hello,

i am not really know your board,
but may like mine you must set RST and SLP

Note: if you are using A4988 or DRV8825 driver, you must connect RST and SLP with jumper cap.