Hello All,

I have a need to know the position of a shaft, within one degree accuracy,
that rotates at a speed of one revolution in two minutes. The shaft can only
make one turn.

I have been experimenting with a Hall Effect device (UGN 3503U) trying to
count the teeth on the sprocket that turns the shaft. Although promising, I
only get a one millivolt difference between the tooth and the gap and the
Hall Effect device has to almost tough the sprocket. To make matters worse,
there is a lot of grease in the area.

While searching for inspiration I came across a linear pot that uses a Hall
Effect device and so contacted the distributer. Unfortunately, they didn't
respond.

Does anyone know of any information that will show me how to construct such a
linear pot?

I could use a photo optic device to count the sprocket teeth and if I don't
get any further with the Hall Effect device that's what I'll do. However a
direct read out device such as a very precise linear pot would make the job
so much easier.

--
Regards,
Phil.

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