- #1
Femme_physics
Gold Member
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Machine parts, conic clutch...two teachers, two different results! :(
So a friend of mine who studies for the same test scanned me his teacher's solution to a problem they solved in class. We solved the same problem with a different teacher. I could really use your help to figure out who out of the two teachers went wrong (or maybe they both did?). This is important.
The Question:
A conic clutch, shown in the drawing, rotates at 700 [RPM].
Calculate the power that can be conveyed (calculate by uniform surface stress).
http://imageshack.us/photo/my-images/577/hwhwscheme.jpg/
Uploaded with ImageShack.us
Since there is a conflict between the used formulas, I won't list them here. I will write the variables...
Rf = Friction's Radius
P = Power
n = rotational speed [RPM]
Fa = Required axial force for the conveyance of the moment
Dm = Needed average radius
α= Conical Angle
[P] = Max allowable surface contact stress
[τ]= Max allowable torsion
THE SOLUTIONS
My friend's teacher:
http://imageshack.us/photo/my-images/267/hwhw1.jpg/
My teacher:
http://imageshack.us/photo/my-images/339/hwhw2.jpg/
So a friend of mine who studies for the same test scanned me his teacher's solution to a problem they solved in class. We solved the same problem with a different teacher. I could really use your help to figure out who out of the two teachers went wrong (or maybe they both did?). This is important.
Homework Statement
The Question:
A conic clutch, shown in the drawing, rotates at 700 [RPM].
Calculate the power that can be conveyed (calculate by uniform surface stress).
http://imageshack.us/photo/my-images/577/hwhwscheme.jpg/
Uploaded with ImageShack.us
Homework Equations
Since there is a conflict between the used formulas, I won't list them here. I will write the variables...
Rf = Friction's Radius
P = Power
n = rotational speed [RPM]
Fa = Required axial force for the conveyance of the moment
Dm = Needed average radius
α= Conical Angle
[P] = Max allowable surface contact stress
[τ]= Max allowable torsion
THE SOLUTIONS
My friend's teacher:
http://imageshack.us/photo/my-images/267/hwhw1.jpg/
My teacher:
http://imageshack.us/photo/my-images/339/hwhw2.jpg/
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