Re: [CAD_CAM_EDM_DRO] Re: Souces of Timing/Drive Pulleys

Just a thought....if your making you own taperlock hubs, it's a simple
matter to turn a threaded portion onto the hub and use a couple of thin nuts
for fastening the pulley to the hub. ONe nut would be used to draw the
pulley onto and tighten the hub and the other would be a lock nut. This
would eliminate having to drill and tap a set of matching holes in the
face(s) fo the hub and/or pulley.

This system would work even with the commercail pulleys if the tapers were
made the same as you've mentioned.
It would also eliminate the need for centering with a 4 jaw chuck...unless
you needed to surface finish the entire part for extremely high speed
balancing.

Smoke

>I agree, it would be wise to match the taper standards of
>commercially available parts.
>
>I'm not sure what you mean about not being able to turn the pulley
>taper first, tho'...
>
>If the pulley is mounted in a 4 jaw, and indicated in... Then the
>taper bore is made... Then a drill mounted to the crosslide/toolpost
>is used to drill/ tap the holes in the pulley (using indexing of the
>spindle)...
>
>Doesn't matter which is done first, holes or taper. It is all
>one "chucking".
>
>The hub material is chucked up. Turned down to the major dia. of the
>taper... Taper turned... Then the drill in toolholder is used, same
>as before, to drill and tap holes as needed... Finally, hub is parted
>off... Again doesn't matter if the taper is before or after the holes.
>
>Hope this helps.
>
>Ballendo
>
>