Homebrew PCBs

if it is anything like the one I tore into the "encoders" may surprise you
on that one they were an odd type with raised spiral magnetic arms 
spinning over opposite spiraling traces on the pickup board with a
daughter card to convert the signals 
nothing like the slotted disk optical encoders I was expecting

you might be able to use the motors with the original main board and
build a stronger gantry to hold the drill rig ,HP claims a resolution of 
1/40th mm on those plotters but the motors aren't any bigger than they 
need to be to move the original parts (paper and pen holder)
maybe if you use a belt reduction to get more torque and scale up
the HPGL output to get it back to the right size?


Brian
-- 
"Nemo me impune lacesset"

> > That plotter has servos with encoders!  Whiz-bang thang, it is!

> If it has encoders then it is pretty valuable.  at least to me.
> it would be a great start for a pcb driller.  encoders help make the
> unit more accurate than steppers.
>
> even without the encoders, the DC servo motors can be used as a
> drilling head.
>
> I guess when I pull it apart, I'll find out !
>
>
> Dave