[OpenPnP] strange behavior after first Homing (M204S problem)

[manu f]

Hello,

2 days ago I recieved a Dell Optiplex 9020 who is very nice to put under my PNP machine.

So I completly reinstall OpenPnP on this machine (and for these who have seen my message, recompile my smoothieware to add temperature controler for vacuum sensor). I also add backlash compensation (onesidedoptimizepositioning).

Well this is my life and this is not very interresting.. untill..I notice a very strange things!

After my first homing who work perfectly, when I asked for a new one, homing movements is very very very slow! WTF ?

So I log gcode and play it with ponterface, after playing the sequence I got the same problem, homing is very slow!

Whats hapened ? In fact OpenPnP send M204S with a very slow acceleration (M204S0.52...look the log file).

And when I home with $H, smoothieware home with the last M204S settings, so very slowly!

So I dont know if it could be considering as a bug but this is not an expected working I think?

So for now I add a M204S200.0 in my driver Home command and this work fine!

Regards

Manu

[ma...@makr.zone]

Hi manu,

yes, that's an artifact of using motion control Simulated3rdOrderControl.

https://github.com/openpnp/openpnp/wiki/GcodeAsyncDriver#gcodedriver-new-settings

On some controllers (Smoothie is one) the acceleration is not reset to the configured default when you home the machine, so it takes the last set acceleration from the simulated jerk. Which is typically very small.

Adding M204 Sxxx to HOME_COMMAND is the right thing to do.

I'll add this to the Issues & Solutions suggestion for HOME_COMMAND.

_Mark

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[manu f]

Thank you Mark for your return, very clear as usual!

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/90e0f1b0-de03-27fb-e75b-20893db5c6cd%40makr.zone.

[ma...@makr.zone]

Hi all,

This is available. It is even using variable substitution in the HOME_COMMAND, i.e. that will dynamically adapt to changed acceleration limits, when they are later changed on the Axes:

See here (with Instructions):

https://github.com/openpnp/openpnp/pull/1319

This is available as new testing version (in about 5 minutes):

Test Downloads – OpenPnP

_Mark