Shaft encoders, tachs, madness...

[billydanger]

I have two motors with 0.5 inch shafts that I need to keep track of and compare during operation. Speed only, not angular position. What would be some likely culprits as far as abandoned equipment that I might be able to salvage something like a rotary encoder or tach?

Thanks in advance,
Billy Danger

[ramancini8]

Look at old printers which use shaft encoders to monitor print head position. You will need/want the associated circuitry.
Look at position control systems such as valve drivers, etc.