Re: encoder

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ebiz_59" <chuckm@...> wrote:
>
> Some may remember me asking about electronics merit badge about 3
> weeks ago. We had a good evening and will have more, but night turned
> out to be more of intro to electronics rather than all the work for a
> merit badge. We did some soldering/desoldering, took apart several
> old mice and an inkjet printer, built a couple simple circuits with
> Radio Shack 300 in 1 kits and played a little with a VEX robot.
>
> Have a couple kids interested in continuing.
>
> My questions - I've been looking for quadrature encoders to learn
> about and use for DRO on school mill etc. I presumed that the black
> plastic wheel encoders we've taken out of copy machines and now mice
> have not been quadrature, and that MAYBE some of the are clear disks
> and the long plastic tape with very small lines might be quadrature,
> but after thinking about it, might the mice ones be quadrature - and
> if not, how can they tell which way my hand is moving?? And ques 2 -
> how do we tell if the printer stuff is quadrature or not?? thanks in
> advance, Chuck
>