odd XY/Z pitch and max velocity

I may have asked that before, but still didn't get hands on changing configuration.
Instead I'm working around that issue on operating level.
So sorry for bothering again.

I have a router with steppers.
X and Y use rack and pinion with 62.8318mm/rev
Z has a lead screw with 2mm/rev

stepper drivers configured with
1600 steps/rev for X and Y
400 steps/rev for Z

That gives step-scales of 25.4647 for X/Y and 200 for Z

If I set max velocity high enough (axis shows 5000) , I get really good, fast and
smooth movements on X and Y but the stepper on Z doesn't like that speed if I
forget to reduce jog speed before moving Z.
On G-code level I go around by using G01 with feed rate instead of G00 for Z.

It kind of works, but there has to be a somewhat more elegant solution to that problem.

Anybody any idea?

Ju

I remember I've tried that once but it didn't have the effect I hoped so I discarded that out of my brain.
That was at a time configuring LinuxCNC for me was more guess work than anything else.
Now That I know a calculator is a useful tool in order to get that parameters right I should remember that.

Happily there is tommylight on the lcnc channel that brought it back to my mind.
It's working great now.
Thanks a lot.

Ju