Hi,
i am thinking of fitting a encoder to the 3.2kw 24.000rpm water cooled spindle.

Now i know of the rotary encoders, though there needs to be some fitting done and they are not so cheap.

I was thinking of sticking reflective material to the shaft and using some kind of infrared sensor mounted apart very near to the shaft. The best would be if no additional electronics are necessary and that the signal output is 24v or 5v, so that it can be read by the BOB. My BOB/galil/ has separate encoder inputs also. And if can be found cheap-20-30euro .

Any ideas how that can be done? Any reason not to be done like this?