[Lab] make a timing pulley

[Darcy Whyte]

Yeah, I consider it a huge breakthrough for me.

You can use their parts in design easier but you can also make some of them.

Once I get my A-Axis I want to go to town with making gears!



On Fri, Jul 8, 2011 at 12:39 PM, <aaron at ottawarobotics.org> wrote:

> **
>
> 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).Â
> http://mambohead.com/2011/07/diy-timing-pulley/
> 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 atÂ
> SPD-SI.com.
>
> Darcy
>
>
>
> 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
>>
>> 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.Â
>> 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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