Generating Gcode for Wood Gears With Inkscape

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Generating Gcode for Wood Gears With Inkscape

Postby jscook55 » Wed Oct 19, 2011 10:10 pm

So I've been playing around with generating gears with this website: http://woodgears.ca/gear_cutting/template.html. It's free, and after doing a printscreen and scaling it into Inkscape you can use that to generate Gcode using the "Gcodetools" extension http://www.cnc-club.ru/forum/viewtopic.php?t=35. There's also a pay version that takes care of some of the scaling and exporting, but either is useful.

I've had some success so far, like the gears below. Didn't get the toolpath offset quite right, but will still experiment some:

Image

Anyway, I put a more detailed write-up on my website at: http://www.jcopro.net/2011/10/19/generating-cnc-wooden-gears-the-easy-way/
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Re: Generating Gcode for Wood Gears With Inkscape

Postby calexander » Wed Oct 19, 2011 11:01 pm

That's cool.

Sooner rather than later I'm going to invest some time in making a set of gears to control a custom clock. I'm sure I'll be re-carving them several times over to get it right, but how would you score the usability of the material you used and were the interlocking spaces nice and tight or loosely fit?

I haven't cut gearing for anything yet, much less a clock, so I'm interested in the nuggets of knowledge one receives during "cast off"... :geek:
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Re: Generating Gcode for Wood Gears With Inkscape

Postby jscook55 » Thu Oct 20, 2011 5:08 pm

Hi,

Yeah, a clock is a project that's been in the back of my mind for a while now...

I used 1/4 inch MDF and I'd say it's pretty good machinability-wise. As far as being durable for a clock, I would guess it wouldn't be great, but that's not a lot of stress on the gears, so maybe it'd be fine.

The interlocking spaces are loose as I've done them in the picture. The program doesn't account for cutter offset, so I believe that's the reason for this. I tried to stretch the parts in Inkscape to account for the cutter, but was thinking it would stretch in both directions (which it doesn't, at least not how I did it). Because of this, my offset was around half of what it should be.
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Re: Generating Gcode for Wood Gears With Inkscape

Postby Sparky » Thu Oct 20, 2011 5:22 pm

Nice! The ability to create your own custom gears opens up a whole new area of creativity, eh?
It may have been mentioned earlier, but there is a freebie Sketchup plug-in called Involute Gears which can be downloaded here:
http://www.ohyeahcad.com/download/
It worked well for me although I haven't moved beyond the initial "yep, I can actually do that" stage after cutting a couple gears. I hope to eventually build a clock too. . . one of these days. Other projects are in the works, getting fine tuned.
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Re: Generating Gcode for Wood Gears With Inkscape

Postby jscook55 » Sat Oct 22, 2011 5:36 pm

So here's the device that I made with some of the gears that I generated. Sort of a model radial engine:

Image

This explains it and has a video:

http://www.jcopro.net/2011/10/22/a-radial-engine-model-made-by-accident/

Funny, as much as I like my ZTW router, it's really nice to have a manual mill as well for the simple stuff! Holes, slots, etc. Guess you can never have too many machine tools!
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Re: Generating Gcode for Wood Gears With Inkscape

Postby skrubol » Wed Oct 26, 2011 11:08 am

What about printing to a pdf and using something like
http://www.pdftodxf.com/
to convert to a dxf, then run through CAM? I did that, and was able to extrude in Solidworks (don't have a 2d cam here.) and it looks pretty good.
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Re: Generating Gcode for Wood Gears With Inkscape

Postby Nick » Tue Dec 13, 2011 8:03 am

Hi!

I just wanted to add that Inkscape has it's own Gears extension which could be used to generate gears instead of drawing them by hand.
And we (cnc-club.ru members) have improved it a little bit: see Gears extension improvements for more information.
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Re: Generating Gcode for Wood Gears With Inkscape

Postby RonGinger » Fri May 25, 2012 10:10 pm

If you really want a great gear cutting package see www.gearotic.com This lets you cut all manner of gears, including escapements.

It was written by Art Fenerty, the same guy that wrote the Mach3 software.
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