Plastic wheeel with magnets

[The Real MicroMan]

I'm looking for a company that sells magnetic encoder wheels. Such as below. Anybody know any place ?

 

[jrz126]

you should fill in your location, might be easier for people to recommend suppliers if they know where you are.

what dimensions are you looking for?

 

[The Real MicroMan]

I'm in Detroit MI by the way. The dim is 1" diameter

 

[nbucska]

use iron wheel with gaps/holes and one permanent magnet in series
with the sensor

 

[zevon8]

As nbucska said, it is often easier to use a permant magnet pick-up sensor, like those used to drive a speedometer , along with a slotted wheel, or gear. You can even use a metal disc that you have cut slots into. I have done this on trucks, using a drive shaft U-Joint 's four wrist pin ends as the "wheel", or a balancing weight on the drive shaft.

You may need to do some shaping of the waveform, since it will be similar to a sinewave, but that is easy to do.

They are called "inductive or magnetic pick-up senders " and you could even get one from an auto scrap yard for cheap.

 

[williB]

if you want to make one yourself this might help..

**broken link removed**
they should fit nicely on a one inch disk..