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Re: Tach pickup Location

 

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I started with a bicycle speedometer.?
This is a 9”?
Magnet super glued to spindle take up nut.?


The sensor was stuck on the headstock near it.?

Requires some calculation to convert mph to rpm



I used it once and the I got a strobe app for my phone. That only requires a piece of white tape and reads direct.?

Jim B,

On Dec 20, 2023, at 6:22?PM, Gary Johnson via groups.io <gwj@...> wrote:

?This is for a heavy 10L, but maybe it will give you some ideas. I used 1/8" dia rare earth magnets (four), mounted in 3/8" dia aluminum pucks epoxied to the gear. They are sized so that the magnets would pass very close to the Hall-effect sensor. The sensor was mounted on an aluminum tee bracket affixed to a spot I flattened off and added a tapped hole. This sensor was part of the accessories offered with the old MachTach kit which unfortunately is no longer made.

-Gary

<Heavy 10L tach sensor mount.jpeg>

--
Jim B
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