Homebrew PCBs

Hi Roy,

My more modern inkjet has the head driven by a 2 wire
motor, and rides along a clear plastic encoder strip
with black lines for feedback.

I was thinking along the lines od a hobby servo that
was modified for continuous rotation.

Since I'm building a light duty xY table, it might be
powerful enough. Some of the mini sumo's can bush a
brick. As for as cost goes, I've got a couple in my
junk box if I want to try them out.

Myc



--- "Roy J. Tellason" <rtellason@...> wrote:

> On Sunday 12 June 2005 10:37 am, Stefan Trethan
> wrote:
> > On Sun, 12 Jun 2005 15:28:51 +0200, mycroft2152
> <mycroft2152@...>
> >
> > wrote:
> > > Hi robert,
> > > Hadn't thought of using servos for this, just
> steppers. But that is
> > > an interseting idea. For hobby robots, the
> servos are modified for
> > > continuous rotation. May just be possible.
> > > The picaxe has built in servo routines and is
> programmed in BASIC.
> > > Should be easy to hook up a couple of servos to
> the screws to try it
> > > out.
> > > Myc
> >
> > I thing the reference to servos was meant more
> general, not RC model
> > servos.
> > They often use DC servo motors on larger CNC
> machines, for faster speeds
> > and more power.
> > There is a severe increase in control circuit
> complexity (you need
> > rotational feedback and a closed loop control).
> 
> I believe that some of the motors I have salvaged
> are servo motors -- there 
> being only two wires instead of the usually larger
> number for steppers, and 
> also the encoder on one side gives it away.  :-)
> 
> > If you do not need to advantages of servos (power
> and speed) it is MUCH
> > easier to go the well tried route of using
> steppers.
> 
> Which is why I plan to use those first!
> 
> > RC servos would not last very long, in this
> application, and would not
> > move very fast or with any amount of force. They
> are more expensive than
> > steppers with no advantages, so i would not
> suggest using them.
> 
> To some people those _are_ "servos",  the term
> having been distorted into tha 
> context,  I guess.
> 
> 
> 
> 
> 
> 
> 
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