[Lab] make a timing pulley

[aaron at ottawarobotics.org]

Fantastic! I had no idea that SPD-SI.com would have the cad files
for their stuff. I can see that being very handy in the future! 

Aaron


On Fri, 8 Jul 2011 12:32:26 -0400, Darcy Whyte wrote: 

> Thanks
Arron... 
> I managed to improvise and make a pulley out of hardboard
(like MDF). http://mambohead.com/2011/07/diy-timing-pulley/ [6] 
> 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 SPD-SI.com. 
> 
> Darcy 
> 
> On Wed,
Jul 6, 2011 at 10:05 AM, 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/ [1] does a nice job. Or
http://www.cad2gcode.com/pulley/ [2] 
>> 
>> The better one is likely
Gearotic (http://gearotic.com/index.html [3]) 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 
>> 
>> Â 
>> 
>> 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?
>> 
>> Â 
>>
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>>
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>> http://artengine.ca/mailman/listinfo/lab [5]

 


Links:
------
[1] http://svstuff.com/Gears/
[2]
http://www.cad2gcode.com/pulley/
[3] http://gearotic.com/index.html
[4]
mailto:Lab at artengine.ca
[5] http://artengine.ca/mailman/listinfo/lab
[6]
http://mambohead.com/2011/07/diy-timing-pulley/
[7]
mailto:aaron at ottawarobotics.org
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