New Config, issues with homing.

Link to my current config: github.com/ccatlett1984/LinuxCNC_configs/tree/main/dmc_test 

I have attached a image of the machine, with limit switch locations and homing direction labelled.

I'm not getting past Z homing, it travels up (the correct direction), I can see the limit switch activate in hal show config, but it doesn't stop and mark the axis homed.

These are the limit switches: (I believe the not's are correct, as those switches are NC)
net min-home-x          <=  hm2_7c80.0.inmux.00.input-15-not
net min-home-y          <=  hm2_7c80.0.inmux.00.input-14-not
net max-home-z          <=  hm2_7c80.0.inmux.00.input-13

Is the Z axis switch Normally Open?

( a reversed axis and inverted home switch might behave like this as it would
back-off the activated switch instead of the search move )

 

Coorrect Z is a NO switch, X and Y are NC

Did you verify that

joint.2.home-sw-in

Goes true when the Z axis limit switch is triggered?



 

I think your latch velocity is going the wrong way. You need it to back off the home switch so it can't have the same sign.
in your ini try

Changing the latch velocity is worth a try _but_ having the same sign on search velocity as latch velocity is valid.

In this case, The homing logic is supposed to move towards the home switch at the search velocity, and when the
home switch is detected, reverse and back off until the home switch deactivates, and then move towards the home
switch again at the latch velocity for the final home switch detection.

I did check one of my known good configs with a shared home/limit before my last reply. It uses a negative latch velocity.
github.com/rodw-au/vmnmillqt/blob/main/VMNmillQT.ini#L247
(units are metric)

Latching happens so quickly its hard to see what is going on. Sometimes I've slowed homing velocities right down (to 10% or less) to troubleshoot.

tommylight wrote:

Just checked some 15 of my old and new configs, luckily i found one where search is positive and latch is negative (on Z), all others are same direction.

I checked another config of mine and it was positive.
github.com/rodw-au/showstopper/blob/master/my_Plasma.ini#L260

I wonder if the sign matters? I don't have the machine anymore to check.

Actually, the sign does matter because I have had machines where one side of the gantry does not home until the sign is flipped!