Re: [CAD_CAM_EDM_DRO] Re: Toothed pully design information needed.

Let's see...without even using a book, I would figure the OD of a 3/8" pitch
timing belt pulley having 40 teeth as follows:

40 x .375 / PI = 4.774648....diameter. From this I would simply use a
cutter made like John mentioned as cut the tooth profiles using a dividing
head.

Does that sound reasonable?

Smoke

-----Original Message-----
From: ballendo@... <ballendo@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Saturday, November 11, 2000 5:23 AM
Subject: [CAD_CAM_EDM_DRO] Re: Toothed pully design information needed.

>Peter,
>
>Good advice on the HTD style belts. I'll never use the Xl(trapezoid)
>again, given Any sort of choice.
>
>I cut pulleys for htd from aluminum bar stock with a ball-end mill in
>the early 90's. That machine is still producing good work (sign
>router). The calcs were from the (then) current Stock Drive parts
>catalog.
>
>Hope this helps.
>
>Ballendo
>
>P.S. ORDER "one" in the size you need, make hundreds...
>Like mariss recently mentioned, Empirical "leads" theoretical.
>
>>>Yes, it would be nice to be able to cut timing belt pulleys. But
>>>don't you use a flycutter for someting like that?
>
>>BTW, see if information on HTD profile belts can be found as I
>>believe the profile is easier to cut. The teeth are deeper so the
>>sprocket is probably more forgiving of imperfections of the cut
>>profile etc. Also, since the teeth are deeper, the belts are less ?
>>prone to skipping under load.
>>Peter
>
>
>
>
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