Re: How to you make a 1/8" collet on a 1/4" shaft

Dean,

Dumore has something that could be adapted to your situation. For
their small toolpost grinders they have a collet chuck which screws
onto the end of their threaded 1/4" spindle. You would only have to
accurately thread the end of your 1/4" rod.

Doug





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "deansala" <adsala@p...>
wrote:

> Hi everyone,
> I have not used this list in a while but when I did, I always got
> great answers. I have a situation. My mill needs a faster motor.

So

> I rigged up a Dewalt Laminate trimmer motor to the top of my
> drawbar. I connected a 1/4 in shaft to the motor which runs down

the

> drawbar hole(about 16" long). On the lower end (turret end) I
> installed a part that houses two high speed bearings in which the
> shaft runs through. Now sticking out the very bottom of the piece

is

> a 1/4" high speed shaft about 1-1/2" long which needs colleting.
>
> The whole idea is so that I can CNC engrave using high speed

engraver

> bits. I need to some how attach an 1/8" engraver bit to the 1/4"
> shaft. What I need (I think) is piece that has a 1/4 female

collet

> on one end and an 1/8 female collet on the other. It can not be

more

> that a couple of inches long. I have tried boring 1/4" and 1/8"
> holes in some round stock and use set screws to attach to the

shaft

> and mount engraver bit. I works ok but it's very hard to get it

all

> true at 30,000 rpms!
>
> Any thoughts or better yet can someone make me the part I seek?
> Dean