I have a problem that I hope someone can clear up. Recently, while refurbishing a large machinery space we upgraded all of the engines controls including digital tachometers.
At first no problem, but then we found that the engines flywheel had to many teeth for the tachometers programmable selection.
I moved the magnetic pickup to the front of the engine (accessory gear train) where there are smaller gears and figured it would be a cut and dry fix to the problem.
A new problem came up when we could not put the Mag. pick up directly on the Crank Shaft drive gear, instead we are picking up our signal from a driven gear that is more accessible.
The Crank Shaft gear 113 teeth is driving an oil pump gear 80 teeth. At first I had planned to set up the tachometer to read as if it were sensing 113 teeth because that is the number on the shaft gear. Other people here feel that we should set up to read 80 teeth. In my mind obviously wrong becouse we would then be simply measuring the speed of the pump and not the engine. But will the idea of simply setting up to read 113 be the solution or am I missing something?
Your help and criticism will be appreciated.
Gear Reduction
Re: Gear Reduction
