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svenhb / GRBL-Plotter

A GCode sender (not only for lasers or plotters) for up to two GRBL controller. SVG, DXF, HPGL import. 6 axis DRO.
https://grbl-plotter.de/
GNU General Public License v3.0
696 stars 176 forks source link

Tangential knife cut different size of figure when cutting by CW and CCW #401

Closed voleoo closed 6 months ago

voleoo commented 6 months ago

I made tangential knife for cutting and now have some strange issue.

I open the SVG file in GRBL-Plotter and it generates g-code. G-code for first figure generated cutting direction by CW and cutting the second figure CCW.

The figure that was cut CCW has the wrong dimensions. Should be 230mm but actual size 234mm. Looks like we have some compensations for tools. If direction CW sizes is correct.

How to generate g-code with direction by CW.

SVG

<svg enable-background="new 0 0 55.5 70" height="70cm" viewBox="0 0 55.5 70" width="55.5cm" xmlns="http://www.w3.org/2000/svg"><g stroke-linecap="round" stroke-linejoin="round" transform="matrix(1 0 0 -1 11.5 11.5)"><path d="m0-12h-10.5a1 1 90 0 1 -1-1v-21a1 1 180 0 1 1-1h10.5 10.5a1 1 270 0 1 1 1v21a1 1 0 0 1 -1 1z"/><path d="m41-21a3 3 90 0 0 3-3v-26a3 3 0 0 0 -3-3h-13-13a3 3 270 0 0 -3 3v26a3 3 180 0 0 3 3h13z"/><path d="m-10.5-11.5a1 1 270 0 0 -1 1v21a1 1 180 0 0 1 1h10.5 10.5a1 1 90 0 0 1-1v-21a1 1 0 0 0 -1-1h-10.5z"/><path d="m28-20.5h13a3 3 270 0 1 3 3v26a3 3 0 0 1 -3 3h-13-13a3 3 90 0 1 -3-3v-26a3 3 180 0 1 3-3z"/><path d="m10.5-35.5a1 1 90 0 0 1-1v-21a1 1 0 0 0 -1-1h-10.5-10.5a1 1 270 0 0 -1 1v21a1 1 180 0 0 1 1h10.5z"/></g></svg>

G-CODE

( Use case: ? )
( SVG import by GRBL-Plotter 1.7.3.2 )
( Source: SQUARES_5.svg )
(<Header >)
( G-Code lines: 306 )
( Pen Down/Up : 5 times )
( Path length : 5165.2 mm )
( Duration ca.: 00:05:09 h:m:s )
( Conv. time  : 00:00:00.0879049 )
( SVG dimension : 555.00 700.00 )
( Graphic offset: 0.00 0.00 new origin: 0.00 0.00)
( Original graphic dimension min:0.000;0.000  max:555.000;700.000)
( Option: Tangential axis: 'Z')
( Dimension XY: 555.0 700.0 )
(</Header >)
(<Tangential Axis="Z" UnitsFullTurn="3.6"/>)
G54 (Setup - GCode-Header)
G90

(<Figure Id="1" Geometry="path" PenColor="000000" PenWidth="0.1" Layer="001" PathLength="902.8"> )
G00 X20.000 Y-240.000 Z1.762

M3 S1000 (PD)

G04 P2

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G01 Z1.608
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G01 Z1.092
G01 X10.357 Y-232.658 Z1.092
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G01 Z-1.762
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G01 X20.000 Y-240.000 Z-1.800
M5 (PU)
G04 P2
(</Figure>)

(<Figure Id="2" Geometry="path" PenColor="000000" PenWidth="0.1" Layer="001" PathLength="902.8"> )
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M3 S1000 (PD)
G04 P2

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G01 X238.635 Y-249.953 Z4.766
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G01 X237.071 Y-247.929 Z4.914
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G01 Z5.362
G01 X230.000 Y-245.000 Z5.362
G01 X125.000 Y-245.000 Z5.400
M5 (PU)
G04 P2
(</Figure>)

(<Figure Id="3" Geometry="path" PenColor="000000" PenWidth="0.1" Layer="001" PathLength="902.8"> )
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M3 S1000 (PD)
G04 P2

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G01 Z-0.115
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G01 Z-0.192
G01 X233.892 Y-480.786 Z-0.192
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G01 Z-3.562
G01 X20.000 Y-480.000 Z-3.562
G01 X230.000 Y-480.000 Z-3.600
M5 (PU)
G04 P2

(</Figure>)
(<Figure Id="4" Geometry="path" PenColor="000000" PenWidth="0.1" Layer="001" PathLength="1228.4"> )
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M5 (PD)
G04 P2

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M5 (PU)
G04 P2
(</Figure>)

(<Figure Id="5" Geometry="path" PenColor="000000" PenWidth="0.1" Layer="001" PathLength="1228.4"> )
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M3 S1000 (PD)
G04 P2

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G01 X245.000 Y-365.000 Z-2.700
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G01 X246.072 Y-357.025 Z-2.815
G01 Z-2.892
G01 X247.358 Y-353.323 Z-2.892
G01 Z-2.966
G01 X249.096 Y-349.858 Z-2.966
G01 Z-3.040
G01 X251.251 Y-346.668 Z-3.040
G01 Z-3.114
G01 X253.787 Y-343.787 Z-3.114
G01 Z-3.186
G01 X256.668 Y-341.251 Z-3.186
G01 Z-3.260
G01 X259.858 Y-339.096 Z-3.260
G01 Z-3.334
G01 X263.323 Y-337.358 Z-3.334
G01 Z-3.408
G01 X267.025 Y-336.072 Z-3.408
G01 Z-3.485
G01 X270.929 Y-335.274 Z-3.485
G01 Z-3.562
G01 X275.000 Y-335.000 Z-3.562
G01 X535.000 Y-335.000 Z-3.600
M5 (PU)
(</Figure>)
G04 P2
M30
svenhb commented 6 months ago

Strange phenomenon. I'm assuming it's a hardware issue since the paths look identical. It is possible in Inkscape to reverse the path, to have it "correct" in your source. But you can also do it in GRBL-Plotter: Select path, right click "Reverse selected path" image

voleoo commented 6 months ago

Very strange issue, Universal G-code sender also cut not correct size when direction CCW. Made all figures to cutting by CW and that resolve my issue.

@svenhb Thank you.