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Mirror image toolpath
« on: June 02, 2013, 08:45:29 PM »
Running Mach3 on a Legacy Arty 58. G-code generated by Vectric VCarve Pro 7.0. Text wrapped around a cylinder is engraved in mirror image. How do I correct this?

Code:

( File created: Saturday, June 01, 2013 - 06:39 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 40.000, Z= 1.250)
( Diameter = 2.5000 Inches)
( Y Values are wrapped around the X axis )
( Y Values are output as A )
()
(Toolpaths used in this file:)
(V-Carve 1)
(Tools used in this file: )
(1 = V-Bit {90 deg 0.5"})
N130 G00 G20 G17 G90 G40 G49 G80
N140 G70 G91.1
N150 T1 M06
N160 G00 G43 Z1.4500 H1
N170 S24000 M03
N180(Toolpath:- V-Carve 1)
N190()
N200 G94
N210 A0.0000 X0.0000 Z1.4500 F100.0
N220 G00 X8.6922 A65.0763 Z1.4500
N230 G1 X8.6922 A65.0763 Z1.2082 F30.0
N240 G1 X8.6987 A65.7472 Z1.2083 F100.0
N250 G1 X8.7020 A66.3275 Z1.2089
N260 G1 X8.7037 A66.8905 Z1.2103
N270 G1 X8.7039 A67.5697 Z1.2121
N280 G1 X8.7014 A68.5623 Z1.2148
etc.

Line N130 sets absolute distance mode (G90), the Line N140 sets incremental distance IJK mode (G91.1). Could this be the problem?

I've never used G91.1 mode before. I use G91 when I'm turning or doing repetitive tasks with different start points. However, the output in lines 210 and on do not appear to be relative movement but absolute movements.

If I were to completely reverse the code, would that fix the problem?

Gary the Perplexed...

Offline ger21

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Re: Mirror image toolpath
« Reply #1 on: June 02, 2013, 09:20:02 PM »
No. I replied further at CNC Zone.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Mirror image toolpath
« Reply #2 on: June 02, 2013, 09:35:32 PM »
Thanks, problem fixed. I'm still perplexed as to why VCarve Pro generated "inverted" coordinates, but that's a discussion for another day.

Offline BR549

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Re: Mirror image toolpath
« Reply #3 on: June 02, 2013, 09:47:01 PM »
I would guess that 1 or more of your axis is backwards to standard convention.

(;-) TP
Re: Mirror image toolpath
« Reply #4 on: June 02, 2013, 09:53:44 PM »
I'll check it out. You may be right.