[Lab] make a timing pulley

Darcy Whyte darcy at siteware.com
Fri Jul 8 12:32:26 EDT 2011

Thanks Arron...

I managed to improvise and make a pulley out of hardboard (like MDF).

It should hold the fort for a while until I can make one out of aluminum
using the completed A-Axis.

I might break down and get one of those gear programs. They look fun.

But I found a way to get CAD files. You can download them for any part at


On Wed, Jul 6, 2011 at 10:05 AM, <aaron at ottawarobotics.org> wrote:

> **
> CamBam can generate timing gears for a regular 2.5D mill/router. The
> problem with cutting it that way is that you don't get nice sharp edges
> inside the teeth. I suppose you could do the first pass with a larger
> cutting tool to quickly cut the outline and then switch to a smaller tool to
> get better tooth definition.
> An A axis definitely makes better teeth though.
> A tool like this : http://svstuff.com/Gears/ does a nice job. Or
> http://www.cad2gcode.com/pulley/
> The better one is likely Gearotic (http://gearotic.com/index.html) from
> the same guy that does Mach3 for your CNC machine, but it possibly is
> overkill for what you need.
> If you dig around there are some free plug-ins or g-code generators that
> will do timing gears for free but I'd likely spend the $12 or $20 to get one
> of the nicer ones from above.
> Aaron
> On Wed, 6 Jul 2011 09:47:40 -0400, Darcy Whyte wrote:
> I'm just about to go to General Bearing Service to pick up a timing pulley.
> Once I have it and I complete my A-Axis for my mill I will be able to make
> pulleys.
> Does anybody know the exact shape of a timing pulley? I don't care about
> the flanges, just the teeth. Perhaps I could try and make one with a 3-Axis
> mill? Is there a code generator for that around? Or some shapes that will
> work?
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