[chbot] building CNC router - was Free stepper motors

[Chris Hellyar]

On 01/07/11 22:48, Volker Kuhlmann wrote:
>> I'll second that.
> of rigidity. I've made my own spindle but have blown it up twice now&
> If they're no good for a CNC job, try the leftovers from a dead battery
> drill?
>
> Volker
>

Battery drill motors wouldn't give you the revs you need, and running 
for an hour on end would kill them as they are very simple brazed brush 
motors.  They'd also have very low rotor inertia which would cause cut 
quality issues if you could get the revs/feed right to keep the chip 
loading right for the tool you're using.

The issues with dremels (and other cheap rotary tools) are the plastic 
case flexing, junk bearings and the cheap chunk/collets used.

There are some very reasonably priced options rather than sticking with 
a dremel.  A lot of people use them as they are the easy-access option I 
suppose and they take a lot of punishment before they expire.  I used 
mine because I already had it and I was really just messing around.  I 
never expected I'd be using it 4 years later, that's for sure.

Cheers, Me.