Pen up/down translation - Z axis

[EhsanBaninajar]

Hi,

I wonder why when selecting Z axis as pen up/down the Gcode is like that:

(Move Pen to upper position)

$J=G90 F5000 Z100.000
(Move Pen to lower position)
G90 G0 Z-100.000

With G90 G0 the pen down is quite fast how ever the pen up took a long time! Is there a way to have G90 G0 for both up and down?

I guess we can use the individual option but if you want to control the pens pressure the same thing happens?

All the best,

Ehsan

[svenhb]

Good question, I don't remember. Should be $J=G90 F5000 Z-100.000 so you can stop movement. If you use grbl 1.1 a stop-button should be visible.
You can easily change the assigned command via right click on the custom button:

[EhsanBaninajar]

I think you did the right thing by including a feed rate on pen‑up. I replaced my servo with a stepper motor and later discovered that the stepper doesn’t have much pulling power if it moves too fast (I used a NEMA 8, which isn’t very strong to begin with).
In any case, thank you very much for your reply, this was really useful information to learn.