--- In
Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
>
> http://www.delorie.com/pcb/dremel-stand/
>
> My big drill press has too much runout for the tiny drill bits, and my
> hand isn't steady enough to drill manually with the dremel. So, I
> made something simple that would just hold the dremel steady so I
> didn't snap any more drill bits. I drilled a couple of 13 mil holes
> with it, seems to do the job (although there's some runout even still,
> partly due to the bits vibrating).
>
Another great example of simple woodwork providing an elegant solution.
The design, heavy dremel on the end of long flexible arms, is going to
show vibration components but there are techniques to try that may
dampen them.
Assuming the dremel is a snug fit it the arms, I would try the mass
weight technique used to stop flutter on aircraft control surfaces.
Bluetac a large-ish lump of steel just behind the dremel on the lower
arm and see if a large mass here will dampen the vibration, at the
drill speed you need. This weight may bend the lower arm and this may
attempt to set the dremel free so tape the arms together for the
experiment.
Once the weight gets up a bit you may need to arrange a counterbalance
for the weight. Perhaps fit a bungee from the top of the uprights to
the area the weight is sitting or alternatively temporarily install
some compressible rubber between the lower arm and base board.
All the best, great job.