Homing does not move motors

[plushvoxel]

Firmware and Board Version
grbl 1.1f
MKS-SBASE v1.3

Input and Output

$$

 $0=1
 $1=25
 $2=0
 $3=3
 $4=0
 $5=0
 $6=0
 $10=0
 $11=0.010
 $12=0.002
 $13=0
 $20=0
 $21=0
 $22=1
 $23=1
 $24=25.000
 $25=500.000
 $26=250
 $27=5.000
 $30=1000
 $31=0
 $32=1
 $33=1000.000
 $34=0.000
 $35=0.000
 $36=100.000
 $100=160.000
 $101=160.000
 $102=160.000
 $110=24000.000
 $111=24000.000
 $112=24000.000
 $120=1500.000
 $121=1500.000
 $122=1000.000
 $130=300.000
 $131=200.000
 $132=50.000
 $140=0.400
 $141=0.600
 $142=0.000

$H

 ALARM: 9 - Homing fail. Could not find limit switch within search distance. Defined as 1.5 * max_travel on search and 5 * pulloff on locate phases.

Expected Behavior
Motors moving in the -X and +Y direction until end stops.

Observed Behavior
Motors not moving at all.
Motors "locking" and making high pitch noise.

[tbfleming]

Do G0 and G1 moves work?

[plushvoxel]

Yes. everything else seams to work. We also had successful laser cuts and engravings.

[tbfleming]

Connect to it using a terminal (e.g. PuTTY) and send it the ? command. It should send a status block back. Look for |Pn:. Within that field will be X, Y, and Z values if it sees any switches active.

Repeat when you're holding down each switch to make sure they register properly.

[plushvoxel]

With the Head in the homing position:

$5=1
  ok
?
  <Alarm|WPos:0.000,0.000,75.000|FS:0,0|Pn:PXYZ>

$5=0
  ok
?
  <Alarm|WPos:0.000,0.000,75.000|FS:0,0|Pn:P>

With the Head not in the homing position:

$5=1
  ok
?
  <Alarm|WPos:0.000,0.000,75.000|FS:0,0|Pn:PZ>

$5=0
  ok
?
  <Alarm|WPos:0.000,0.000,75.000|FS:0,0|Pn:PXY>

A switch in the Z direction is not attached.

I assume $5=1 is the correct setting. But when I home with this, I get ALARM: 8 - Homing fail. Cycle failed to clear limit switch when pulling off. Try increasing pull-off setting or check wiring.

[tbfleming]

The Z switch input might be confusing it. Try tying it off to either VCC or GND (opposite of what your switches drive to).

[tbfleming]

Scratch that. It looks like you need to change config.h so it won't try homing Z:

#define HOMING_CYCLE_0 ((1<<X_AXIS)|(1<<Y_AXIS))
// #define HOMING_CYCLE_1
// #define HOMING_CYCLE_2

[plushvoxel]

Ah, in the grbl/config.h. It would be nice if this was optionally / disabled in laser mode or configurable via serial commands.
Shall I open an issue?

[tbfleming]

Some lasers use a Z axis to adjust focus based on stock height. I'm trying to avoid moving too far from grbl-328's way of doing things to make it easier to move grbl-lpc to grbl-hal when it comes out.

[plushvoxel]

My grbl/config.h now has the lines 106 to 109 as follows:

// #define HOMING_CYCLE_0 (1<<Z_AXIS)                // REQUIRED: First move Z to clear workspace.
#define HOMING_CYCLE_0 ((1<<X_AXIS)|(1<<Y_AXIS))  // OPTIONAL: Then move X,Y at the same time.
// #define HOMING_CYCLE_1 ((1<<X_AXIS)|(1<<Y_AXIS))  // OPTIONAL: Then move X,Y at the same time.
// #define HOMING_CYCLE_2                         // OPTIONAL: Uncomment and add axes mask to enable

Works for me and our K40 laser cutter.

Much Thanks!

[X3msnake]

@marble You can add this info to the wiki if it is not there yet it would help out others. Best regards No dia domingo, 9 de julho de 2017, Marble <notifications@github.com> escreveu:

…

My grbl/config.h now has the lines 106 to 109 as follows: // #define HOMING_CYCLE_0 (1<<Z_AXIS) // REQUIRED: First move Z to clear workspace. #define HOMING_CYCLE_0 ((1<<X_AXIS)|(1<<Y_AXIS)) // OPTIONAL: Then move X,Y at the same time. // #define HOMING_CYCLE_1 ((1<<X_AXIS)|(1<<Y_AXIS)) // OPTIONAL: Then move X,Y at the same time. // #define HOMING_CYCLE_2 // OPTIONAL: Uncomment and add axes mask to enable Works for me and our K40 laser cut. Much Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#8 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AKke-vLCIQeTQdyMhQnxMFCCZAwQy6vYks5sMVrdgaJpZM4OSI_D> .

-- Com os melhores cumprimentos, Vinicius Silva

[plushvoxel]

What wiki do you mean?
The cncpro wiki?

[X3msnake]

The GRBL wiki 2017-07-10 12:07 GMT+01:00 Marble <notifications@github.com>:

…

What wiki do you mean? The cncpro wiki <http://cncpro.co/index.php/65-documentation/initial-configuration/firmware/grbl-lpc-1-1e> ? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#8 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AKke-gJ5PDxR-_2WMp8EDdtm6aSBQ7Myks5sMgXkgaJpZM4OSI_D> .

-- Com os melhores cumprimentos, Vinicius Silva