How to prevent the torch from moving up?

Hi
I use QtplasmaC cutting configuration in Linuxcnc. How can I prevent the torch of the plasma machine from moving up, when I change material during the cutting process in Linuxcnc software?

When I use the following code which recommended by Linuxcnc, the torch goes up. but I don't want it.F#<_hal[plasmac.cut-feed-rate]>
M3 $0 S1
.
.
M5 $0

Could you please help me how to solve my problem?

Thanks

Not sure what you want???
Moving torch up is basic plasma stuff, so i do not get it why would you want it down during changing material?
To break it easier?

Thank you for your quick response.

You are right! When you use a plasma cutting machine, the torch should move up for every material change.
But, I want to use this configuration of Linuxcnc to run another machine which I designed for a special project.
All the features of the PlasmaC configuration are along with my purpose except moving up the torch!

The torch height is controlled using external offsets:
linuxcnc.org/docs/devel/html/motion/external-offsets.html

It is not a material change that causes the torch to rise, it is part of a sequence of events stated by a spindle stop (M5 $0) or an error/abort during a cut.

You could possibly prevent it with a bit of hal work on the axis.z.eoffset-enable pin. You would need to be very careful is this would cause repercussions later if the Z axis is not where it is expected to be.

Thanks,
You got my point.
So, is it possible to remap the M05 to prevent rising the torch?

Another question:
The safety height parameter controls the amount of rising of the torch.
But I cannot set this parameter to zero!
If I could have set it to zero, my problem would have been solved.
Do you have any suggestions?

Bl484 wrote:

Another question:
The safety height parameter controls the amount of rising of the torch.
But I cannot set this parameter to zero!
If I could have set it to zero, my problem would have been solved.
Do you have any suggestions?

It that will work for you then I will have a look tomorrow. 

A quick an dirty method to test whether this may work for you is to change the value via HAL while QtPlasmaC is loaded.
You cannot use zero as there is an inbuilt fallback which sets it to maximum Z height if zero is detected.
I am assuming a very low value will be good enough to test with.

Thanks a lot. It works.
 When I used your recommended HAL command, It worked. But I cannot use them in HAL files (and *.pref file)!
When I set the safe height parameter to a non-integer number, the software does not accept it, and this parameter will change to 100!
It means I should adjust it every time in the setting panel and use the HAL command.
Do you have any suggestions?
 

Can you try the commands in a postgui Hal file.

If it is worthwhile I could change the code so that you could set it to zero from the parameters.