AVR-Chat

--- In AVR-Chat@yahoogroups.com, erikc <firewevr@a...> wrote:
> Dave Mucha wrote:
> > Hi all,
> > 
> > I'm trying to find more data about the R/C throttle control.
> > 
> > as I am to understand, the control input to an
> > ElectronicSpeedController (ESC) is over a repetitive 20mS frame.  and
> > in that frame there is a range between 0.5 and 2.0mS that is the
value.  
> > 
> > That would make it so 0.5mS is a zero speed and 2.0mS would be
100% speed.
> > 
> > am I correct on this?
> > does anyone have a schematic for an ESC for a burshless motor ?
> > 
> > I'm looking for a 25,000 RPM motor to use on a PCB drilling machine
> > and these seem small enough and high speed enough to do the job. 
> > Unfortunatly, the combination of motor and ESC can run upwards of
$1750 !
> > 
> > Any comments or suggestion are welcome.
> > 
> > Dave
> 
> Have you considered using a Dremel or similar motor and mounting it
into 
> some kind of holder?
> 


I have thought about that, but am hoping to find a higher quality set-up.

the dremel with it's plastic housing is not as ridigid as I would
like.  It is also much taller and heavier than I'd like to wind up with.

It is a fall-back though.

Dave