Low Speed for 3d Printing application

andypugh
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06 Dec 2019 20:26 #152172 by andypugh

Replied by andypugh on topic Low Speed for 3d Printing application

Swapping the letters in the G-code at the point that it is loaded is likely to be easier as LinuxCNC supports import filters.

linuxcnc.org/docs/2.7/html/config/ini-co...html#_filter_section

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Muz94
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06 Dec 2019 20:30 #152173 by Muz94

Replied by Muz94 on topic Low Speed for 3d Printing application

Of course, I was just trying to avoid having Z and U swapped in the dro, in the manual commands etc.

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Hakan
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06 Dec 2019 20:50 - 06 Dec 2019 20:52 #152174 by Hakan

Replied by Hakan on topic Low Speed for 3d Printing application

Give it a go at swapping Z and U.
If it changes things then...
If not then,...

Last edit: 06 Dec 2019 20:52 by Hakan. Reason: An s where needed. But my grammar suck big time anyways.

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Todd Zuercher
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06 Dec 2019 20:57 #152176 by Todd Zuercher

Replied by Todd Zuercher on topic Low Speed for 3d Printing application

There was an experimental branch that extends full blending capabilities to all linear axis XYZ and UVW. And it may even be possible that this has already been merged into Master. github.com/LinuxCNC/linuxcnc/issues/611

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Muz94
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06 Dec 2019 21:54 #152187 by Muz94

Replied by Muz94 on topic Low Speed for 3d Printing application

Does this mean that i'd have that functionality simply by updating to a newer version of linuxcnc?
At the moment i'm creating a simulator version of my config (for now i've just loaded sim_parport and edited my scripts so that linuxcnc doesn't crash even without the external temperature controller connected). The only issue in that it runs VERY slow, the control reports normal speeds, but it's actually going in slomo.
Am i missing something?

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andypugh
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06 Dec 2019 22:10 #152189 by andypugh

Replied by andypugh on topic Low Speed for 3d Printing application

Todd wrote:
And it may even be possible that this has already been merged into Master.

It isn't

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Muz94
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06 Dec 2019 22:15 - 06 Dec 2019 22:23 #152190 by Muz94

Replied by Muz94 on topic Low Speed for 3d Printing application

Muz94 wrote:
...The only issue in that it runs VERY slow, the control reports normal speeds, but it's actually going in slomo.
Am i missing something?

Setting base_period to 0 fixed this
Now the simulator works, and i can see the tool slowing down on curves.
Tomorrow i'll swap Z with U and see how it goes

Last edit: 06 Dec 2019 22:23 by Muz94.

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andypugh
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06 Dec 2019 23:51 - 06 Dec 2019 23:52 #152197 by andypugh

Replied by andypugh on topic Low Speed for 3d Printing application

I have written a filter file for you (as awarm-up to writing a more complicated one for somebody else)

save this code as "swapZU" in your linuxcnc directory, then make it executable [1]

#! /usr/bin/python

import re
import sys
import math

print '(Axes swapped, U to Z and Z to U)'

infile = sys.argv[1]

f = open(infile, 'r')

for line in f:
    line = re.sub(r'Z','&',line)
    line = re.sub(r'U','Z',line)
    line = re.sub(r'&','U',line)
    print line

Then edit the [FILTER] section of your INI to look like this:

[FILTER]
PROGRAM_EXTENSION = .ngc G-code
ngc = /home/andypugh/linuxcnc/swapZU

(Except using your home directory name, not "andypugh")

To keep it simple and obvious the regex will swap _every_ u and z, even in comments and variable names. Cleverer regexes could avoid this, but it shouldn't really matter.

Then all G-code files should have Z and U swapped.

[1] Either command line, or right click the file in the file manager, select "properties" select the "permissions" tab and tick "allow this file to run as a program"

Last edit: 06 Dec 2019 23:52 by andypugh.

The following user(s) said Thank You: tommylight, Muz94

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Muz94
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07 Dec 2019 13:19 - 07 Dec 2019 13:21 #152244 by Muz94

Replied by Muz94 on topic Low Speed for 3d Printing application

---- deleted ---

Last edit: 07 Dec 2019 13:21 by Muz94.

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Muz94
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07 Dec 2019 13:20 - 07 Dec 2019 13:21 #152245 by Muz94

Replied by Muz94 on topic Low Speed for 3d Printing application

Thank for the code!
I tryed (in the simulator) and it LOOKS like it definetly makes a difference, even tho it's not easy to see as swapping the axes messes up the preview pretty bad. I tryed setting GEOMETRY = X Y U hoping that the U axis would be rapresented as Z but it doesn't work.
I still think that fixing everything in linuxcnc would be better, having to jog the machine with swapped axes would be quite bad, i'd crash it every time xD

I'll have to look into the code and see if it's something feasible.
Is all this managed into tp.c?

ops: i quoted myself instead of editing

Last edit: 07 Dec 2019 13:21 by Muz94.

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