Re: Poor Mans DRO

Why is it that almost all DROs seem to use rotary encoders vs linear
encoders? (at least that I've heard of - bearing in mind I'm new to
this and haven't actually ever _seen_ a DRO... :-) Is it a matter of
it being easier to match the rotational step of a motor directly to a
a rotary encoder - vs trying to get a rotational step, once driven
through a lead/ball/etc screw arrangement, to match up to a linear
increment?

Thanks for any input!

Jim



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "eewizard_1"
<eewizard_1@y...> wrote:

>
> After reading about the mouse guts DRO maybe some would be
> interested in a low budget linear encoder.
>
> The head burned out on an inkjet printer I had so I took it
> appart to get the little motors. It had a nice 12" linear scale

with

> an HP quadrature detector for print head positioning. Some of the
> printers go up to 2400DIP so don't just dump the old printers.
> They're a gold mine of neat small parts (and full of ink from head
> cleaning).
>
> Al