JOOI, is there anything special about the motors used in dremel tools (or
look-a-likes)? Do they normally have any kind of gearbox between the
motor and chuck, or are they directly coupled?
One of my projects is to build myself a little CNC mill (for cutting/
shaping wood, not metal), and I was going to buy a dremel tool for the
business end of it - but TBH I can't* think of any reason for owning a
dremel except for this specific application, so it's a bit of a waste if
I can source a suitable motor at a fraction of the cost.
* well, I'd probably find uses - but nothing that I can't do well enough
with other tools already.
in fact people are throwing away old model aircraft BRUSHED electric motors.
So there are lots available.
RC car motors are probably the best bet..replaceable brushes and quite
well made and powerful.
Both. Cordless drills use epicyclic gearboxes, high-torque mains
drills don't (sometimes a simple spur gear reduction if they're two
speed). "Dremels" are either direct drive for the fast / mains ones,
or epicyclic gearboxes for (some of) the lightweight battery ones.
You can't mill wood, you rout it. This needs higher speeds. Most
metals (aluminium, brasss, silver) used for hobby CNC are also routed
at high speed with small carbide burrs. Unless you have particularly
high torque leadscrew drive, you can't make a CNC mill that handles
the forces of real milling cutters.
The usual choice is either a cheap Proxxon mill with steppers added
and the original head, or else a slightly heftier mill converted by
the addition of a router head. Kress is a popular choice (web order
from Germany, now that Wickes have stopped selling them).
For a few foot sqiuare MDF / plywood profiler, (cheap to build, with
an MDF frame) the favoured cutter head is the small blue Bosch 1/4"
On Sun, 04 Sep 2011 02:41:33 -0700, Andy Dingley wrote:
Ahh, I don' think any of my local sheds even sell the battery ones (and
mains would be more practical in this situation anyway). If I go
searching for an equivalent motor only, I'm just not sure what to be
looking for at present.
Yes, good point ;-)
Yes, that's the kind of thing I'm needing - nothing more heavy duty than
that. I'm not sure if the steppers that I have are up to the job yet,
though (hopefully I'll get chance to test them later today).
On Sun, 04 Sep 2011 12:10:27 -0700, Andy Dingley wrote:
Sadly all the ones I've harvested from things are unipolars and not
particularly meaty ones at that - if I pick up one of the rotary tools
(mentioned in a reply to TNP) then I can try simply hooking them up and
see if they're good enough to deal with thin ply (I do have some suitable
gearing to play with)
On Sun, 04 Sep 2011 20:06:44 +0100, The Natural Philosopher wrote:
Yes, 1/4" ply would be the main material (rarely something thicker, which
I could probably do in two passes with some manual finishing afterwards)
The motor problem might have solved itself - I spotted that there's a
dremel clone on sale in a local shed earlier for $10 (which must be
around 6 or 7 quid). At that price I may as well just buy one and ditch
the case. Unfortunately I won't make it into town until Tuesday -
hopefully they still have some left then.
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