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Join this group to post and comment. vish4me • May 18, 2009

# calculation of torque in a rectangular section

hi,
how do you calculate torque in a rectangular section due to rotation.do we follow the same method as we use for circulaer cross section. that is torque=force * perpendicular distance/ Rohan_sK • May 18, 2009
Actually FORCE*PERP.DISTANCE = MOMENT OF THE FORCE and NOT torque.
TORQUE would be exclusively the TURNING EFFORT for the rotation of the shaft.
The rectangular section of the shaft would not change the torque required, it depends on the load to be turned and the mass moment of inertia for the particular geometrical shape of the shaft c/s ( in this case its rectangular).
So for Torque calculations use the formula I have mentioned in an answer to your earlier post. vish4me • May 19, 2009
hi,
in this case, the shaft c/s is circular. but a rectangular c/s load is mounted on the shaft. how do i calculate the torque. vish4me • May 22, 2009
hi,
i used the formulae torque=I*alpha. the section mounted on shaft should rotate by 180 degrees in 25 minutes. so the speed of shaft came to be 0.02 rpm. hence alpha was very small. so the torque i calculated was of very low value. also the power caame to be in watts even though the weight to be rotated was 15 tonnes. wat is the mistake? vish4me • May 22, 2009
hi,
i am doing a project on frame tilting arrangement where the sheet metal stacks mounted on a shaft have to be rotated by 180 degrees. the mass of the shaft is 15 tonnes. to calculate the torque required i found the mass moment of inertia and multiplied it by angular acceleration. the total time taken to rotate the stacks is 25 minutes.so the speed is extremely slow. since the setup reaches the speed instantaneously, for calculating angular acceleration i took time as 0.1 sec(i don know whether this is right). i got very low torque value and also low power.(it came in watts!). i donot know the mistake . please help asap.

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