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of Involve, Same as Involute.
Not certain what you mean but try google / involute curve , then click on the involute curve
the involute curve is the fundemantal shape of (amongst others) a spur gear tooth profile, generated from the gear base circle diameter.
how to calculate different stresss on the involute internal spline
impossible
EXTERNAL INVOLUTE SPLINE
MAJOR DIA : 140mm.
MINOR DIA : 128mm.
NO. OF TEETH : 22
SPLINE WIDTH : 8mm.
IS : 3665