[Error] An error was detected while sending '$H': ALARM: Homing fail. Streaming has been paused.

[gadgetman53]

Feature request

Problem description

I am able to jog X, Y, and Z axis using UGS. I have hardwired limit switches which I have tested as well. When attempting to home, I receive the following errors and have yet to find what is actually causing the issue:

$H [Error] An error was detected while sending '$H': ALARM: Homing fail. Streaming has been paused. [Error] Error while processing response : An unexpected command was completed by the controller. Grbl 0.9j ['$' for help] $$ $0 = 10 (step pulse, usec) $1 = 25 (step idle delay, msec) $2 = 0 (step port invert mask:00000000) $3 = 0 (dir port invert mask:00000000) $4 = 0 (step enable invert, bool) $5 = 0 (limit pins invert, bool) $6 = 0 (probe pin invert, bool) $10 = 19 (status report mask:00010011) $11 = 0.010 (junction deviation, mm) $12 = 0.002 (arc tolerance, mm) $13 = 0 (report inches, bool) $20 = 0 (soft limits, bool) $21 = 1 (hard limits, bool) $22 = 1 (homing cycle, bool) $23 = 1 (homing dir invert mask:00000001) $24 = 25.000 (homing feed, mm/min) $25 = 500.000 (homing seek, mm/min) $26 = 250 (homing debounce, msec) $27 = 1.000 (homing pull-off, mm) $100 = 180.000 (x, step/mm) $101 = 180.000 (y, step/mm) $102 = 652.000 (z, step/mm) $110 = 500.000 (x max rate, mm/min) $111 = 500.000 (y max rate, mm/min) $112 = 500.000 (z max rate, mm/min) $120 = 10.000 (x accel, mm/sec^2) $121 = 10.000 (y accel, mm/sec^2) $122 = 10.000 (z accel, mm/sec^2) $130 = 200.000 (x max travel, mm) $131 = 200.000 (y max travel, mm) $132 = 200.000 (z max travel, mm)

Expected Behavior

Actual Behavior

Steps to Reproduce the Problem

1. 1. 1.

Specifications

Version

Operating system

Platform

Other

[gadgetman53]

I have toggled $23 between 0 and 1 with no change in Z axis direction. I thought the axis should begin upward, but it moves downward. When I just use the jogging, all of my axis move in their appropriate direction.

[gadgetman53]

I'm using an Arduino UNO with CNC shield 3.0 Product Version: Universal Gcode Platform 20200106 Java: 1.8.0_241; Java HotSpot(TM) 64-Bit Server VM 25.241-b07 Runtime: Java(TM) SE Runtime Environment 1.8.0_241-b07 System: Windows 10 version 10.0 running on amd64; Cp1252; en_US (ugsplatform)

[breiler]

So the machine starts moving the Z-axis?

Is it supposed to move more than 200mm that is setup in $132? This value also act as the maximum seek distance for homing so increase that value to your Z-max distance.

Regarding the homing direction you should have a look at this table: https://github.com/gnea/grbl/wiki/Set-up-the-Homing-Cycle#homing-direction

[abdset]

This may help. https://github.com/winder/Universal-G-Code-Sender/issues/1208

[gadgetman53]

Thank you all for the assistance. Based on feedback, I examined the shield as well as the Arduino and there was no visual soldering issues. So I swapped out the Arduino board with a replacement and that corrected the issue. Not sure why pin 12 did not work, but my issue is resolved.

[abdset]

The following text is token from config.h file of grbl 1.1h and its speaking about how to use pin11 or pin12 to be a Z limit switch or spindle enable:

// Enables variable spindle output voltage for different RPM values. On the Arduino Uno, the spindle // enable pin will output 5V for maximum RPM with 256 intermediate levels and 0V when disabled. // NOTE: IMPORTANT for Arduino Unos! When enabled, the Z-limit pin D11 and spindle enable pin D12 switch! // The hardware PWM output on pin D11 is required for variable spindle output voltages. //#define VARIABLE_SPINDLE // Default enabled. Comment to disable. // Aby: i disabled this to use regular D11 pin for Z limit switch.