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| NormanV:
Andrew, it didn't trigger from the hole alone. I was concerned about the screw sticking out also, I will build a guard to cover the it. |
| Arbalist:
Looking good Norman! :thumbup: Where did you get the tachometer and proximity sensor? |
| vtsteam:
What is the pulley made from -- I had thought you had cast it from aluminum, Norman. If ferrous, I can see why Andrew says it could be done with a hole. Or do these things merely need a conductor of any sort passing by? It seems like there is a fairly large gap to the transducer -- did you try it closer with the hole? |
| awemawson:
Most proximity sensors will work on a 1/4" hole in a rotating wheel or whatever. But they do vary in sensitivity. most work in the 1 to 3 mm range. I've worked on many machines where the detector is sensing the hole for a grub screw that retains the part on a shaft |
| NormanV:
Arbalist, I bought the tachometer on Ebay, item number 261307045946. Steve, I have just been out to the workshop to check it again. The transducer does not see the hole even when it is just 1mm from the pulley. The pulley is in fact cast iron, it is a taperlock pulley that I turned the groove off as I just wanted it for locking onto the spindle of the collet chuck to allow me to fit the screws for adjusting the preload in the main bearings. |
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