On Mon, 28 Nov 2005 18:14:00 +0100, Dave <
wa4qal@...> wrote:
> One of the problem with a collet mount is that it only accepts
>
> certain sizes of bits. Fortunately, Dremel has a Jacobs style
>
> chuck that will attach to the business end of a Dremel tool and
>
> allow precision mounting of very tiny bits. It's item 4486, near
>
> the bottom of this page:
>
>
> http://www.dremel.com/HTML/products/accessories/accessories.pdf
>
>
> Dave
That doesn't really change that jacobs chucks have awful runout, esp. the
cheaper ones (but then, dremel collets are probably no better).
I don't say there are no precision jacobs chucks, just that most aren't
precision.
Most carbide drills come with the same size shank, so i never changed the
collet, and for HSS the runout of a jacobs chuck doesn't matter anyway.
There are a few carbide drills out there with the shank same dia. as the
business end, but i simply avoid them.
ST