All works fine except for Z-axis speed

caycee · March 12, 2022

Controlling my printer from Octoprint or bare G-codes my Z-speed is just fine as set in my Marlin firmware.

But if I try to move Z from my TFT35 knob any greater than 1mm at a time, the Z-motor stalls out from going WAY too fast.

I'm thinking it might be the same speed as is set for my X and Y axis. Note the speed needed for Z is 10x less!

#define DEFAULT_MAX_FEEDRATE { 6000, 6000, 600, 300 }

How can I change that? Firmware for the TFT? Some Marlin setting I've missed? Other?

BTT Tony · March 15, 2022

Hi,

Please set as attachment

caycee · March 16, 2022

Unfortunately, changing the Z value in that set does nothing.

I'm using TMC2208 stepper drivers, and changing the Z-value from its original value of 1066.67 (3mm * 16microsteps * 200 steps/rev for my old stepper drivers) up to 20000 and down to 200 and it made no change in the behavior at all. Not even for the Z-position. (It still goes 100 mm for a 100 mm input.)

BTT Tony · March 18, 2022

Hi,

The Z axis cannot be moved, please send m122 to test the drive status. and provide pictures

caycee · March 20, 2022

This was active during a stalled movement of the Z axis using the knob to do Z +/- at 1mm resolution. It stalled due to too many 1mm increments in a row. (likely about 3).

A normal G1 Znnn movement on my machine must have F650 or less, otherwise stall.

debug.txt