14 years ago
I want to use this in an application where I have this on a PC board,
engaging a shaft. My problem is one of tolerancing: I'd like to have a
tolerance stack-up that just lets me just assemble the whole unit and
have it work, without adjusting and without the shaft binding up on the
pot. But the part doesn't come with any mechanical specifications for
the radial tolerance of the shaft, nor does it come with any guidelines
for using the pot as a bearing (so I assume that's a big no-no).
I got samples and looked at one under a microscope -- it appears that the
rotor can move about 0.005" in any direction before it touches the case.
Using "don't touch" as a guideline, I end up with tolerances that drive
my mechanical assembly costs through the roof. I can't imagine that's
the intended way to use this -- it's for consumer products, so there's
got to be a way to make it happen.
So, how do people make these things work as rotary position sensors? Is
there a mechanical specifications document buried on the MuRata web site
that I'm missing? Is there a cost-effective shaft coupler to be had
that'll couple the angle without coupling off-axis motion?
Comments, advise, brickbats -- all are appreciated.