Re: [CAD_CAM_EDM_DRO] BT30 drawbar

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".

There are 4 balls in the collet as far as I can see.

I just took a photograph, my digital camera had trouble focusing up in
that dark hole, but you can just see them if you zoom on the pic.

It can be seen here
http://homepage.ntlworld.com/fdosdesign/temp/DSCF0677.JPG

Wayne.....


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Wayne M Weedon Fdos Design Poole UK Email: wayne@...
Tel +44-1202-677025 Fax +44-1202-770515 Mob 07774 439915 Skype fdosdesign

Specialists in small batch & Production Mechanical/Electrical Engineering
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