Re: [CAD_CAM_EDM_DRO] Re: best type of hub for pulleyts (DONT USE A KEY)

Hi Jon, list,

That's a pretty good chuck!

If a "chucking ring" as you say is bored with it's location known in
reference to #1 jaw, then even "lessor" chucks can be relied upon to
turn a pulley accurately if the ring is always chucked in the same location.

Alan KM6VV


Jon Elson wrote:

>
> If you have a decent 3-jaw chuck, there's no need to indicate, unless
> you want
> to prove that the pulleys are (or aren't) concentric. But, if you are
> going to
> bore them anyway, you just need the OD to run true when boring.
>
> What I did is cut a ring of aluminum that would fit between the pulley
> flanges.
> The OD is greater than the flange OD, the ID is a very close fit to the
> pulley
> cogs OD. I then cut the ring in two parts with a bandsaw. The ring halves
> are slipped into the flanges and the whole thing is placed in the
> chuck. (I have
> an adjustable 3-jaw chuck, so I can set it to run as true as I need it
> to. But,
> it generally is within .0003" or so, without even checking.) This makes
> very
> quick work of mounting a bunch of pulleys for boring out.
>
> Jon
>