high geared (1:100) Z steppers config

wydowaw

I am new to the forum.
I did not find anything on "high geared stepper problem"
So I am looking for some guidance on my Z stepper settings, the current config file is stalling both Z steppers instantly when performing the first stepper test.

Firmware Name: RepRapFirmware for Duet 2 WiFi/Ethernet
Firmware Electronics: Duet Ethernet 1.02 or later
Firmware Version: 2.04RC1 (2019-07-14b1)
Web Interface Version: 1.22.6
CoreXY, double Z steppers with high gear ratio (1:100)

0_1567713489752_config.g

Pronterface F33 speed setting worked, moving Z on a rumba board

Thanks for your help.

Phaedrux

M350 X32 Y32 Z1 I0 ; configure microstepping without interpolation
M350 Z1 E16 I1 ; configure microstepping with interpolation

Microstepping of 1 is likely the issue. I would suggest trying with x16 first.

Phaedrux

M201 X500.00 Y500.00 Z1.00 E250.00

Acceleration of 1 may also be too low. Try 10 or more.

Phaedrux

Also, for future ease, with RRF you can set your microstepping to x16 and set your steps per mm values based on x16, then you can modify the microstepping again on a later command and the firmware will automatically recalculate the steps per mm for you.

For example:

M350 X16 Y16 Z16 E16 I1        
M92 X80.00 Y80.00 Z20000.00 E420.00                ; set steps per mm
M350 Z1 E32 I1                                     ; configure microstepping with interpolation

So as long as you set the microstepping to x16 first, and your steps per mm are set for x16 on the following line, you can make changes to the microstepping afterwards and it will calculate the new steps per mm for you.

wydowaw

Problem solved; Spot on !!

The micro stepping, is the problem.
Although the high geared motors (1:100) have a large number of steps/mm
M92 X80.00 Y80.00 Z20000.00 E420.00 ; set steps per mm

The micro stepping 16 and even 32 works fine... (I thought it was impossible.
32 is even beter...I was able to crank up my Z speed from F58 to F190 before the steppers are stalling.

Thanks for the great help!!