Speed of G28 Macro

General Discussion
1

Is there a way to set the speed of movement during the G28 macro?
The default Z movement speed is resonating with some part of the printer and is particularly loud. I checked all the fittings and fasteners and can’t find the cause. I’m hoping just to drop the Z moves out of resonant range to resolve it.

2

You may look here for homing_speed:

https://www.klipper3d.org/Config_Reference.html#stepper

Don’t make it too fast to:

  • Prevent crashes against the endstop
  • To give the MCU time to check the endstop.

If you use safe_z_home, you may look here:

https://www.klipper3d.org/Config_Reference.html#safe_z_home

3

Hi, default homing speeds for all axis throw no issues. However when control of Z axis is made via gui control tab or through BED_SCREWS_ADJUST, etc… Z is driven too fast, skips and tries to sing. Where should I be looking to change this? Many thanks.

4

Hello @poonholder !

Can you share the klippy.log?

5

Indeed, apologies for my delay.
Im sure im the issue, setting incorrect max vel, max acc, for z in config. But is there a global setting for the GUI tabs for axis movement? It grinds when positioning the z axis alone. Printer is a two trees pro, z is build plate. The federate is to high when using BED_SCREWS_ADJUST also. Other than that, whilst printing it is seemingly ok.
Many thanks.
Uploading: klippy-7 feedrate stall.log…

6

klippy-7 feedrate stall.log (2.5 MB)

7

If the Z speed is too high, you can set it in the [printer] section of the printer.cfg

[printer]
kinematics = corexy
max_velocity = 250
max_accel = 4000
max_z_velocity = 15
max_z_accel = 25
8

Many thanks Eddy, are the current settings not awfully low though?

9

Just give it a try and set it to 10 or 5

1 Like
10

I will do, many thanks.