Garage torsion spring
Richard J Kinch writes:
Everett M. Greene writes:
And what's wrong with it?
Everything. Method and results.
Very enlightening.
Method:
C = pi * D (geometry 101)
Unstated assumption of D = 6"
turns = distance / C
Results:
approx. 5 turns. Actually, less for typical 7' garage door
Now what's wrong?
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