I'm curious how the flex shaft affects spindle speed for you. The flex shaft
that came with my Dremel drags the speed down so much I wouldn't feel
confident using it for the really small PCB drills even of the runout was
I have an air spindle I got at HF for $15 that has the same problem. The
runout seems fine, but the stinkin' collet isn't true. If I fiddle with it
by twisting it to different angles in the spindle I can usually get the bit
to run true enough to get the job done without breaking.
I wonder if anyone has had any success in making custom collets for these
tiny drill bits.
----- Original Message -----
Sent: Sunday, July 31, 2011 10:21 PM
Subject: [SherlineCNC] Re: Printed Circuit Board Favrication
> For what it's worth, I have an older Dremel set that came with a flex
> shaft and handset. The handset has FAR less run-out and bearing play than
> the Dremel itself. The weak link is the crappy collets. I fortunately
> found a collet amongst my assortment that runs true and thus the handset
> is adequate for my hobby engraving needs. No idea if this is the norm or
> not for the handset.
> --- In SherlineCNC@yahoogroups.com, "Jeffrey T. Birt" <birt_j@...> wrote:
>> A Dremel tools makes the world's worst spindle, the run-out is horrible.
>> would be much better off with something like a Wolfgang spindle or Bosh
>> with PreciseBits collets: