Grbl homing switches

1

Hi, I’m new for CNC and GRBL 1.1f.
I’m trying to upgrade my CNC machine to get limit switches.

wldofkyw0zm31
wldofkyw0zm311148×1172 215 KB

This is my CNC board and all the 5 limit switches (connected as NO and one z axis switch) are connected as below image.

89c715ce-f2c2-11e6-9ffc-6f078f510d74
89c715ce-f2c2-11e6-9ffc-6f078f510d743114×2374 2.06 MB

All the 5 limit switches are working fine. But when I press the home button, it moves up along the z axis until it hits the limit switch and it tries to go up more about 5 seconds and the status goes to alarm . I was wonder why it is not stop or react when it hits the switch and why it only moves z axis even if it does not react the limit switch.

current my settings are as below
and I can communicate my board with arduino IDE (board: arduino nano, processor: ATmega328P (old))

$0=10
$1=25
$2=0
$3=2
$4=0
$5=0
$6=0
$10=16
$11=0.010
$12=0.002
$13=0
$20=0
$21=1
$22=1
$23=3
$24=25.000
$25=100.000
$26=250
$27=5.000
$30=9000
$31=0
$32=1
$100=800.000
$101=800.000
$102=800.000
$110=1000.000
$111=1000.000
$112=600.000
$120=30.000
$121=30.000
$122=30.000
$130=300.000
$131=180.000
$132=45.000

Please help me to solve this problem…

Thanks!

2

Change $27 to 5mm ($27=5) because each home switch is triggered twice. First at Homing Seek speed ($25), then Homing Feed speed ($24). If the trigger is not released due to insufficient pull-off distance ($27) it will throw an alarm and halt.

3

My current setting for $27 is 5mm which is $27=5.000

My problem is when I press “HOME” it goes up for Z axis and ignoring the limit switch then stops cause of the alarm status…

4

Your switch is not being recognized.
Hold the switch down and send a ? to the controller.
Paste the response here.

What sender are you using?

1 Like
5

I didnt read well enough, as Neil says the switch isnt recognized. (not reading the trigger)

If you use Easel it will display a “light icon” for each limit, which will turn green when registered.
Are the switched wired normally open (NO) or normally closed (NC)?

6

If that is the Version 3.4 board (can’t be sure from photos), on mine the Z and X limit switch pins have reversed markings.

7

Figured out!

on my Board, X and Z pins are switched…
I plugged Z limits on X pin and X limit switches on Z pins then It works as what I wanted.

I’m not sure what it will cause on this machine. I’m thinking that the manufacturer labeled it wrong (this is what I hoped)

Thanks guys