28BYJ-48s cannot run at 60 RPM shaft speed, try steps per rev = 32 and rpm = 640, that should give about 10 RPM shaft speed, remember, the 28BYJ-48 has a 32 step motor and 64 to 1 gear reduction.
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28BYJ-48s cannot run at 60 RPM shaft speed, try steps per rev = 32 and rpm = 640, that should give about 10 RPM shaft speed, remember, the 28BYJ-48 has a 32 step motor and 64 to 1 gear reduction.