Re: boring a timing gear

Dave,

In a similar situation where I had to bore out a 18 tooth hub to
5/8". I successfully used Rocksett, it's a ceramic cement not a
contact cement. Tensile strength is approx 250 psi, shear is 450
psi, it can work at up to 1100C.

Bernard

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude
<davemucha@j...>" <davemucha@j...> wrote:

> I have a 24 tooth nylon timing gear that has a 1/2 dia aluminum hub
> thru the center and a 1/4 inch bore.
>
> I'd like to open it up to a 3/8 bore to fit my NEMA34 single stack
> stepper to drive a 72 tooth pulley on my drill press.
>
> The setscrew is in a hub that is 0.875 inch dia so the screw will
> have enought grab.
>
> I am not sure if the 0.062" wall is too thin.
>
> any comments ?
>
> Dave