how to temporary change a value without variables?

arhi

The idea

homeall.g (actually I have this in homex, homey and homez instead of here but this is easier to show the point):

M913 X30 Y30 Z50
M566 X0Y0Z0

M98 P"homex.g"
M98 P"homey.g"
M98 P"homez.g"

M913 X100 Y100 Z100
M566 X1000Y1000Z50

What I would like to do is

xc = ??
yc = ??
zc = ??
M913 X30 Y30 Z50
xj = {move.axes[0].jerk}
yj = {move.axes[1].jerk}
zj = {move.axes[2].jerk}
M566 X0Y0Z0E0

M98 P"homex.g"
M98 P"homey.g"
M98 P"homez.g"

M913 X{xc}Y{yc}Z{zc}
M566 X{xj}Y{yj}Z{zj}

Is this at all possible now or only after variables are implemented? I'm not sure if maybe push/pop can help here. They can't if I read the documentation right but better to ask then to be sorry.

I could not find the current modifier in the M409F"vd9" response, will this be part of the model at some point?

Danal

After variables.

I take it you are wishing to reduce current and jerk during homing. Current is a percent, so you can just set it back to 100. Jerk is a value, so you want to capture the 'before' value. Since you really don't want to set jerk to zero, how about dividing it by a factor, and then later multiplying by that same factor.

M913 X30 Y30 Z50
{move.axes[0].jerk} = {move.axes[0].jerk} / 8

... do the actual homing...

{move.axes[0].jerk} = {move.axes[0].jerk} * 8
M913 X100 Y100 Z100

arhi

Exactly. I had an expensive failure yesterday due to human error that I'd like to avoid in the future. The printer is able to home even with 10% of the power on the motors and on a 60+ hour print who care if homing procedure will take 3sec or 3minute so speeds can be low, jerk minimal. I did not yet test how will RRF report stall as I did not configure anything around it but even if nothing is reported still the motors should just skip steps and not break anything.

At the moment I don't see a reason why would I want current to be anything other than 100% after homing but I guess it would not hurt to just return it to previous values. Jerk too. The divide and multiply is a great idea, I'll test it out. Thanks for the tip! So far I only set these values in config.g and here so really not a huge deal even if I keep them static but I'm just exploring as I never before used "dynamic gcode".

Phaedrux

I store my motor currents in their own macros. Then I can just call the macro when I want to change it. It also keeps the values centralized to those macros for when I want to change them.

CurrentsPrint.g CurrentsHoming.g etc

Same for Z axis speeds for homing and printing.

Not as fancy, but until variables are here it works.

arhi

@Phaedrux that is an awesome idea, thanks!