Acceleration of U-Axis asynchronous to XYZ

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25 Jun 2012 19:13 #21316 by poolspieler
Ok,
I found this linuxcnc.org/docs/html/man/man9/hypot.9.html#FUNCTIONS page.
This should explain, how to use it.

Now I have to understand, how to build an own comp.

Best Regards,

Andy

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25 Jun 2012 19:25 #21318 by andypugh
poolspieler wrote:

I found this linuxcnc.org/docs/html/man/man9/hypot.9.html#FUNCTIONS page.
This should explain, how to use it.


It would be handy, wouldn't it? Those pages are just auto-generated from the components themselves.
You could read this doc: www.linuxcnc.org/docs/html/hal/intro.html

But it boils down to adding this to your HAL (put it in the custom.hal if you don't want stepconf to over-write it)

loadrt hypot count=1
addf hypot.0 servo-thread
net xvel axis.0.joint-vel-cmd hypot.0.in0
net yvel axis.1.joint-vel-cmd hypot.0.in1

And then the cartesian velocity can be seen on the hypot.0.out pin.

You can compare it to motion.current-vel pin. If it is the same then there is no point having it. Whether it is the same depends on if U is part of the built-in velocity command.

I am wondering if there is any scope for using adaptive feed based on a goop-pressure sensor.

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25 Jun 2012 19:42 #21320 by PCW

I am wondering if there is any scope for using adaptive feed based on a goop-pressure sensor.


Or it that's too hard sensor wise, model the extruder and use that for the adaptive feed rate control

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25 Jun 2012 20:18 #21321 by poolspieler
Hi Andy,
I have done this plot:


Tomorrow I will try to write an own comp for my extruder.

Is there perhaps a tutorial or something else here in the forum?
I think, I have to install additional environment packages (e.g. gcc) - or is this already shipped with the LiveCD?

Best Regards,

Andy
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25 Jun 2012 20:25 #21323 by BigJohnT
Well you might start with the comp manual...

John

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