Re: [CAD_CAM_EDM_DRO] Re: cutter or tooth profile for XL series timing belts/pulleys?

On Monday 29 August 2005 14:22, lcdpublishing wrote:

> There is another aspect similar to gears too, it has to do with the
> angle on the sides of each "tooth" so that the teeth on the belt can
> enter and exit the "tooth slots" in the pulley without rubbing. So,
> again, the angle on the sides of the "tooth slot" are important.

It seems to me that all of the motion is transmitted by the sides of the
"teeth" on the pulley and belt (for XL series anyway).

Therefore, a person could cut properly angled teeth in two passes, with the
blank first angled clockwise and offset left just the right amount to cut the
left of the tooth (and all the way round to cut the left side of all the
teeth) and then angled CCW and offset right an appropriate amount to cut the
right side of all the teeth.

The area between the teeth would look a bit like a "W", and a skinny cutter is
clearly called for, but so long as the tip of the W is lower than the tooth
on the belt (or a third pass taken to clean this up), this would seem to
work .. with no fancy cutter required .. just a 1/8" dia. or so endmill.

Am I missing something ?


Alan

--
Alan Rothenbush
Academic Computing Services
Simon Fraser University
Burnaby, B.C., Canada


Before me things create were none, save things
Eternal, and eternal I endure.
All hope abandon ye who enter here.