I purchased a Thai made bicycle speedometer for my band saw several years ago and mounted that on the top wheel. Using a formula I found somewhere like this forum I set it to read blade speed in metres per second tho it could also be set to read rpm or fpm. I may still have the setup instructions and formula if you need them.
I should have been smart and kept it when I replaced that bandsaw.
I think you could probably find a suitable location for the small magnet that provided the pulse AND the peanut sized sensor so that it would read chuck rpm
So much TO LEARN! Apparently, I need to add electronics to curriculum. That a speedometer could interpret as FPM is like made to order. I'd recommend posting the setup and formula an individual thread. Sure to be appreciated by many.
...we'll learn more by wandering than searching...
Here is a pic from the listing
You need no knowledge of electronics, it will measure the rpm of whatever device you put the pickup on.
Firm proof that one can find the answer to anything on the web. (Well, at least stuff that has an answer. "Meaning of life" and such questions are referred to the religious shamans.)
Home Shop Freeware
The above only applies to the use of the bicycle speedos (mentioned in post 3) or other tachos which allow for a method of calibration. IT DOES NOT APPLY to the type of tacho shown in the first post. These have no calibration or adjustment features, they are made to display RPM based on a single pulse per rev.
However, it would be a simple project to put an Arduino or similar micro between the pickup and display, programmed to convert the pulse rate into a linear measure which could be made m/s or FPM at the press of a button or flick of a switch. The programme (confusingly called a sketch in Arduino speak) could have the bandsaw wheel diameter hard coded before being downloaded from a PC. That would keep the programming simple but would mean that minor software changes would be needed for each wheel diameter or there are various ways to set it up to accept the diameter data via controls on the device itself, like programming a VFD or setting the time on a digital clock. The Arduino programming would be more complex in that case.
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