Re: BT30 drawbar

Henrik,

A few of the spindle mfrs. have cutaway drawings on their websites.
I agree; when i went looking for this it IS hard to find. But i DO
remember seeing some cutaway drawings... (I wasn't looking for a
specific industry standard; just the genearl way it was done.

On THAt note; here are a couple resources:

www.buildyouridea.com (A start to finish small ATC is described with
pics)

Cnczone has a few threads on the subject.

Hope this helps,

Ballendo

P.S. My Haas machine manuals show a bit, but for a different taper

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Henrik Olsson" <henrik-
olsson@...> wrote:

>
> Hi guys,
> What is the most common design of the drawbar for a 45degree BT30

pullstud?

> I mean the part that actually grabs the holder and pulls it

up/into the

> spindle. I imagine some kind of tapered "thingy" with balls that,

when

> pulled up, pushes the balls in making contact with the chamfer on

the

> pullstud. When the drawbar is pressed down the same 45deg chamfer

can push

> the balls backout and the holder is free to "fall out".
>
> I've searched the net but can only find info on the pullstud and

nothing on

> its mating part. Does anyone have a photo, drawing, sketch or

description of

> how this is supposed to made?
>
> Thanks in adavance!
>
> /Henrik Olsson.
>