Some might consider the fixed size an advantage. :) The mechanism is
inherently simpler, and centering can be much more accurate. I don't find
the "specialness" at all a handicap. Good carbide bits can be had rather
inexpensively:
http://store.yahoo.com/drillcity/pcbkit.htmlResharpened bits are just as serviceable, and cost under $1 each.
----- Original Message -----
From: "Dave" <wa4qal@...>
> 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