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: Generated Gcode in EMC2

Type	Extension of vector graphics editor Inkscape
Developer	Gcodetools develop team
Written in	Python
OS	Cross-Platform (Windows, Linux, MacOS)
Version	1.6.03
License	GNU GPL
Downloads	7800+

Gcodetools

Gcodetools is a plug-in for Inkscape. It prepares and converts paths from Inkscape to Gcode, using biarc interpolation.

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Wow awesome!
Will include that for sure!

By the way, I can include you into Gcodetools-team so you will be able to update the code dirrctly.

PS Hmmm... I'm thinking of moving the code to github...

Hallo everyone! I'm new on the forum.

First of all I must congratulate you Nick really usefull software you've developed.

But I have some troubles, I'm not shure if it works properly. When I do Path for Gcode options i fill G00 Z save over blank with 20, and I receive g code without any move in Z axis at all! Every path I selected and G00 pathes between them are on the same level at Z zero.

I've no idea what cause the problem, furthermore I was generating propper g codes with G00 moves safe height before.

Can you attach your svg and ngc so I'll be able to check them.
PS what version are you using?

Here are svg file and generated g-code:
https://drive.google.com/folderview?id= ... sp=sharing
Of course I selected only colored pathes, gray ones are for real elements after cutting. I use 1.7 version and as I said before I was able to generate propper tracks several times, but never as complex (and never open pathes, may be it's a reason?).

Thanks for quick response!

Hmmm just tested your svg everything seems to be fine...
Where do you set Z safe distance, (in Path-to-Gcode -> Preferences)?
Can you attach a screenshot of that window?

Yes, I set it on that tab. Here's the screanshot you asked for:

https://drive.google.com/file/d/0B1Ug7J ... sp=sharing

I tried it again, but with the same result:/

May be a piece of code I've just generated would help:

M3
(Header end.)
G21 (All units in mm)

(Start cutting path id: path4032)
(Change tool to Default tool)

G00 Z0.000000
G00 X791.977310 Y50.824528

G01 Z0.000000 F400.0(Penetrate)
G01 X790.442699 Y44.130556 Z0.000000 F1600.000000
G01 X759.945088 Y44.130556 Z0.000000
G01 X759.945088 Y46.935167 Z0.000000
G01 X760.744793 Y46.935167 Z0.000000
G01 X757.982317 Y46.935167 Z0.000000
G01 X758.736810 Y46.935167 Z0.000000
G01 X758.736810 Y44.130556 Z0.000000
G01 X729.615004 Y44.130556 Z0.000000
G01 X728.080421 Y50.824528 Z0.000000
G00 Z0.000000

(Change tool to Default tool)

G00 Z0.000000
G00 X727.401310 Y53.823139

G01 Z0.000000 F400.0(Penetrate)
G01 X725.866754 Y60.525917 Z0.000000 F1600.000000
G01 X794.190977 Y60.525917 Z0.000000
G01 X792.656394 Y53.823139 Z0.000000
G00 Z0.000000

Edited: And have you generated it succesfully?

My fault. I didn't notice 0.00 Z scale in Options tab. I changed it to 1 and everything's fine. I'll cut my work as soon as I get 2mm collet. I'm sorry for mess.

Keep going!

Hi there

This is my first post here, so I will explain a bit what I do.

But first, a LOT of thanks and congratulations for the job done making this plugin

It was something really missing to the open-source CNC world.

I use linuxCNC on my router for gluing solarpanels at work, and when work is done, I pretty often unscrew the glue pump from the machine, put a spindle on it, and play with gcodetools... And here is my Xmas gift of this year : a little bird's house. To be cut in a 800x600x10mm wood panel with a 6mm cylindrical tool, glue/nails-free assembly, suitable for chidren.

Here are the svg and the ngc files for those who want to try it :

ok_COMPLET_trous_larges_1passe_0001.ngc: (187.74 КБ) 1299 скачиваний

chemins -3mm, calepinage 800x600, chemins, trous larges.svg: (59.2 КБ) 1080 скачиваний

Should look like this at the end :

I would like to help you making this wonderful tool, but I understand mostly nothing to python... So as I'm french, I propose to help for french translation if needed.

Have a good day

Yann

Wow cool! Birds should like it

.

As of the translation... Gcodetools is included into Inkscape, so all translations are to be made inside inkscape's POT files.
But I've heard that they plan to put translations of the extensions outside, so probably we will be able to make our own translations without pushing the code into inkscape...

Great work on this extension! It's the only g-code generator I've seen that can generate lead-ins and lead-outs for plasma cutting. I am using the version 1.7, linked to on the first post. I assume this is the latest version?

Two questions though:
1. Is it possible to control the order of the cut paths? Right now if I have a hollow drawing object (say a circle with another circle removed from the inside of it), the generated g-code cuts the outer path first, before the inner path. This is not correct. The inner paths should always be cut first with a plasma cutter (well most 2-d cutters I imagine, such as vinyl).

2. Is it possible to change the direction of the paths? For plasma cutting the current generated directions are backwards. Outer cuts should always be clockwise and inner cuts should be counter-clockwise because of the way the plasma jet swirls. I understand that this is backwards of the direction rotary cutters are typically moved.

I can hack the python code easily enough, if I am pointed in the right direction.

torriem писал(а):1. Is it possible to control the order of the cut paths? Right now if I have a hollow drawing object (say a circle with another circle removed from the inside of it), the generated g-code cuts the outer path first, before the inner path. This is not correct. The inner paths should always be cut first with a plasma cutter (well most 2-d cutters I imagine, such as vinyl).

Right now you can control order by moving paths up/down along imaginary Z axis. I.e. the paths that are above others will be cut firstly.
(and you will probably need to uncheck auto sort paths to reduce rapid moves).

torriem писал(а):2. Is it possible to change the direction of the paths? For plasma cutting the current generated directions are backwards. Outer cuts should always be clockwise and inner cuts should be counter-clockwise because of the way the plasma jet swirls. I understand that this is backwards of the direction rotary cutters are typically moved.

In Inkscape - Path - Reverse path.

Thanks, Nick! That sounds like it should work out. When you say move the path up the Z axis, do you mean I do something in Inkscape once the plasma paths have been created but before I generate the G-code? I'll give it a go.

yes, you have to play with the objects position. With inkscape (or other vector drawing tool, for what i know) you can define objects (here, your pathes) to be in front of others. So the path in front will be cut before the path in back.

Got it. Many thanks! Looks very good! I just had to break my paths apart so that I could manipulate the inner path separately from the outer.

Is there any provision for setting a tool width so that the cut is always outside the shape instead of right on the line? Or do I just need to take that into account when drawing things up?

This is what I do myself : I draw my path right where it should be, and then I use the inkscape command "inset" or "outset" from the "Path" menu, Ctrl+( or Ctrl+)

Buuuuuuut....... I look into inkscape to see the exact english menu name to tell you... and there is a big problem, inkscape should ask for the amount of units you want to inset or outset the path... so you can move your path for half your tool size and it's ok. And now with the newest version I have, the amout of move is defaulted to 2px and I can't find any way to change this. Documentation just says the default is 2px. Looks like they changed a very usefull feature to a totally pointless one

Does anyone know if there is a way to change that value ?

EDIT : ok I found out one solution, it's explained into the "gears" tutorial here : http://www.cnc-club.ru/forum/viewtopic. ... rt=20#p194
you should use "dynamic offset" and do some boring xml editing to adjust the value. But at least you can do it.

bricofoy писал(а):inkscape should ask for the amount of units you want to inset or outset the path... so you can move your path for half your tool size and it's ok. And now with the newest version I have, the amout of move is defaulted to 2px and I can't find any way to change this.

There are two ways either Path - Dynamyc offset (Ctrl+J) and edit amount in XML editor (Ctrl+Shift+X), or you can define offset's step in Preferences- File-Preferences-Steps.

The bad thing that offset is really complicated procedure and it changes the path from time to time, i.e. offset can be not accurate.

Thanks for the tip ! Why the hell is this not mentionned in inkscape documentation ?

Can we imagine a future version of gcodetools can have an option to use G41/G42 for tool radius compensation when using path-to-gcode ? http://linuxcnc.org/docs/html/gcode/gco ... 41_1-G42_1
So we can draw the exact path, set a tool to use, and the rest is automatic...

Problem in that case can be for determining if it should use left or right compensation, but I think you can select this with the color asigned to the path stroke, e.g. green for right and red for left.

Or with the path direction, maybe ?

You can try to add G41/G42 into Tool's change Gcode.
But! If there are small segments in the sharp angles which can not be reached with defined tool's radius LinuxCNC will raise an error that those segments can not be reached and will refuse to execute the code.
As I've said offset is really complicated procedure... so even linuxcnc can not do it for every path...

I have used the engrave tool on the path shown, however it produces extra engraving paths at the upper "T" and the lower "d". Is this a problem with my settings, or could it be an issue with the gcode program? svg and ngc files are attached as well. Thanks - BillT

I eventually figured this one out.
There were duplicate path points that caused the engraving path problems.
After removing the duplicate points, the engraving path is now fixed.

For some reason the engraving is now offset from the original path.
I am not sure what causes this issue.
All of the paths have been combined prior to running the engrave operation.
Any help would be appreciated.

Thanks - BillT

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