Z homing homes to rear right ?
June 19, 2017 11:15PM
Marlin 1.1.3
Mks Gen 1.4
BLTouch probe

Folks Need some advice. Marlin 1.1.3 Mks Gen 1.4 board The issue is when I home G28 it goes to the rear right corner, but when I use G28 Y single home the Y or X they work just fine.
Re: Z homing homes to rear right ?
June 20, 2017 03:03AM
Not sure why it should behave differently with single axis homing than home all, but check your homing direction in config.g and motor direction are correct. If you ask it to move to x=0 does it move left? And if you ask for move to y=0 does it move towards the front?

Change motor direction in config (or by turning off the power and reversing the motor connector) then set homing direction depending on where your endstops are physically located, so min = left for x and front for y.

Edited 1 time(s). Last edit at 06/20/2017 03:06AM by DjDemonD.


Simon Khoury

Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions
Re: Z homing homes to rear right ?
June 20, 2017 05:32AM
If you are compiling Marlin 1.1.3

By Sending a G28 - You are sending a Home Message
By sending a G28 Y - You are telling it to go to Y-Zero Location
By sending a G28 X - You are telling it to go to X-Zero Location

// Configuration.h

Did you Set Your bed size Here
// Travel limits after homing (units are in mm)
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS 220
#define Y_MAX_POS 220
#define Z_MAX_POS 180

Did you Enable
//Home to the center of the bed
#define Z_SAFE_HOMING

#if ENABLED(Z_SAFE_HOMING)
#define Z_SAFE_HOMING_X_POINT (((X_MIN_POS + X_MAX_POS) / 2) + X_PROBE_OFFSET_FROM_EXTRUDER) // X point for Z homing when homing all axis (G28).
#define Z_SAFE_HOMING_Y_POINT (((Y_MIN_POS + Y_MAX_POS) / 2) + Y_PROBE_OFFSET_FROM_EXTRUDER) // Y point for Z homing when homing all axis (G28).
#endif

If your bed size is incorrectly Set Larger than it is, It would try to center in the Back-Right hand corner

Edited 6 time(s). Last edit at 06/20/2017 05:54AM by Roberts_Clif.
Re: Z homing homes to rear right ?
June 20, 2017 07:19PM
Here are the Config H and Adv files.

When I do a G28 it goes to the Rear right and probes

When I do a G28 Y and/or a G28 X it moves to the front left corner of the bed area where it used to go with RC7/8

When I do a G1 X0 it moves to the middle line of the bed
When I do a G1 Y0 it moves to the middle line of the bed

If I do a G1 Y0|X0 after a G28 it moves to the middle line on Y but is further towards to front of the bed (FR&FL)

I really don't know what is causing this other than a silly mistake from me.


Configuration_adv.hConfiguration.h

Edited 2 time(s). Last edit at 06/20/2017 07:20PM by Dunston-UK.
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