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Re: Mechanical speedometer drive solution
“GM old standard was always 1000cableRPM = 60MPH. Start dividing by 2 and get down to 2MPH needs about 33RPM.”
(1000RPM=60MPH)/30= (33.3RPM=2MPH)
1000 Revolutions per minute = 60MPH, and 60MPH = 1 Mile per Minute so
1000 Revolutions per minute = 1000 Revolutions per mile
How to get 2000 pulses per mile 12 volt square wave to drive the motor 1000RPM?
At 60MPH, 2000 ppmile = 2000 ppminute. So (60MPH=2000ppMin)/30 = (2MPH=66.6ppMin), and 66.6ppMin/60seconds = 1.11ppSecond, or 1.11Hz
1000cable revolutions per minute = 2000 pulses per mile at 60 miles per hour, so
1.11Hz = 33.3RPM at 2MPH.
I’ll need to take the 1.11Hz signal from the DRAC and convert that to drive my motor 33.3RPM at 2MPH.
We need an electric motor capable of starting around 15RPM that can increase to something above 1000RPM.
I set up a test jig and tried several motors:
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