# Problem homing z axis

16 May 2021 11:25 - 16 May 2021 11:26 #209071
Replied by newbynobi on topic Problem homing z axis

HOME = -10.000
HOME_OFFSET = 0.5
HOME_SEARCH_VEL = - 8.0
HOME_LATCH_VEL = 0.5

This are the setting in your case, SEARCH and Latch need different directions
You do not need a HOME_FINAL_VEL entry, if not used, max vel will be used.

Norbert
Last edit: 16 May 2021 11:26 by newbynobi.

16 May 2021 11:46 - 16 May 2021 11:50 #209077 by anli
Replied by anli on topic Problem homing z axis

You're right - I missed the - in front of HOME_LATCH_VEL . With the config
```MIN_LIMIT = -190
MAX_LIMIT = 0.001
HOME = -10.000
HOME_OFFSET = 0.5
HOME_SEARCH_VEL = 4.000000
HOME_LATCH_VEL = -0.50000
HOME_FINAL_VEL = 0.50000
HOME_USE_INDEX = NO
HOME_SEQUENCE = 0
HOME_IGNORE_LIMITS = YES```

I get the following error (10 changed to 14):

What happens is that it moves towards the switch (right direction) and then stops once it hits the switch. It does not move further. I also tried with HOME_FINAL_VEL being negative - although it states in the documentation linuxcnc.org/docs/devel/html/config/ini-...html#_home_final_vel that it has to be a positive number. But the error is the same.

With
```MIN_LIMIT = -190
MAX_LIMIT = 0.001
HOME = -10.000
HOME_OFFSET = 0.5
HOME_SEARCH_VEL = -4.000000
HOME_LATCH_VEL = 0.50000
HOME_USE_INDEX = NO
HOME_SEQUENCE = 0
HOME_IGNORE_LIMITS = YES```
the axis moves towards the wrong direction.
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Last edit: 16 May 2021 11:50 by anli.

16 May 2021 11:56 #209080 by anli
Replied by anli on topic Problem homing z axis
Ah, once I looked at the source I think I know where the problem is!

This is the place where the first message is thrown:

It should not throw this message because HOME_IGNORE_LIMITS is YES in my config. However it does.

This is my config:

As you can see there is no line break at the last line - which is HOME_IGNORE_LIMITS = YES. So I think the missing line break is the problem. I'll try and be back in a minute.
##### Attachments:

16 May 2021 12:06 - 16 May 2021 12:07 #209081 by anli
Replied by anli on topic Problem homing z axis
That it was ! Once I added a line break after the last line homing works with this config as expected:
```MIN_LIMIT = -190
MAX_LIMIT = 0.001
HOME = -1.000
HOME_OFFSET = 2.000
HOME_SEARCH_VEL = 8.000000
HOME_LATCH_VEL = 0.500000
HOME_USE_INDEX = NO
HOME_SEQUENCE = 0
HOME_IGNORE_LIMITS = YES
#file needs a line break after last line!```

Thanks a lot to everyone who helped! Have a great sunday!
##### Attachments:
Last edit: 16 May 2021 12:07 by anli.

16 May 2021 13:10 #209090
Replied by newbynobi on topic Problem homing z axis
Hi,

glad you found it, I would never ever have looked at this!
My last lines are normally the spindle settings, so I might not have seen this behavior.

By the way, why do you have 4 digits in the DRO, being in metric mode?
Do you know it can be set on the settings page?

Norbert