rotating shaft considering self load and overcome the friction
rotating shaft considering self load and overcome the friction
(OP)
I am trying to rotate 60" long shaft of dia 4" made of SST 630 need to rotate at 60 rpm. If the shaft is resting on a bearing at both the ends, which formula do I use to calculate the power required to rotate this shaft considering self load of shaft and overcome the friction of bearing.





RE: rotating shaft considering self load and overcome the friction
RE: rotating shaft considering self load and overcome the friction
We need more information than you have given, can you tell us what the shaft is for and the bearing material, finally how soon do you want the shaft to reach running speed (ie how much time have you got between starting and reaching full speed).
regards
desertfox
RE: rotating shaft considering self load and overcome the friction
RE: rotating shaft considering self load and overcome the friction
RE: rotating shaft considering self load and overcome the friction
RE: rotating shaft considering self load and overcome the friction
The power you need is given by this formula:-
P= 2*3.142*T*N/60
T = I*angular accel
where I= Moment of Inertia = M*r^2 where M= mass and
r= shaft radius
T= Torque
N= RPM
This assumes no friction
regards
desertfox
RE: rotating shaft considering self load and overcome the friction
RE: rotating shaft considering self load and overcome the friction
Where T is in Kips,
represented T = I*angular accel
In the formula P= 2*3.142*T*N/60
What is the unit for T
RE: rotating shaft considering self load and overcome the friction
The T is Torque.
Also I think I made a mistake with moment of inertia it should be divided by 2.
ie I=M*r^2/2
Regards
desertfox
RE: rotating shaft considering self load and overcome the friction
In the formula P= 2*3.142*T*N/60
What is the unit for T
I appreciate your help.
Thanks you,
RE: rotating shaft considering self load and overcome the friction
T is in Nm
desertfox
RE: rotating shaft considering self load and overcome the friction