Torque Calculation of the Roll

What impinges on this roller that might impede its rotation?

(Information thus far is sorely lacking.)

Hello,

This assembled on an shaft which inturn supported at both ends by roller bearings.This shaft is connected to universsal joint shaft and which is connected to gearbox and motor.My intention is to confirm some of the calculation i did is correct or not.My end when i calculated i got approx 127 N-m as the required torque. But i considered the wt of the material only as the force.Now i need to know weather need to consider any other factors like Moment of inertia and all to be considered.I f you have any information about the same please do share with me.

Regards,

RR

Why don't you just admit you're out of your depth with this pipe roller system?

No. Anybody cannot help you do your job because you do not understand the requirements that must be known to do your job. What you need is not anybody but somebody that knows your job better than you do. Spinning this roller without any frictional load applied can be easily done by even an HO gauge electric locomotive motor. Spinning this roller quickly up to 10,000 RPM to test the uniform integrity of the of the composite material of the roller will take a much different motor and mechanical design. If your roller will be supporting some added mass on the roller that will be moved laterally or vertically then this will also change your drive requirements. Your drive requirements will also depend greatly on the bearing friction added to this roller that are not in your drawing.

Now, do your own homework.

All you need is gravity and 3° of slope.

if its a retrofit then just test the thing:

Wind a rope around the roller, hang different weights from your rope and decide which weight spins the thing fast enough for you.

Use T=Fr to calculate the required motor torque.

If its not a retrofit then: (please note - this is quess work)

a) Estimate the rotational friction of the system - maybe contact your bearing supplier, they might be able to give you a rotational friction coefficient? - if not search a bit and try to see if you cant find one.

b) Use T=kW where k= rotational friction coefficient and W is your weight (in Newtons) to calculate the torque required to overcome friction.

c) From here on you need to know how fast you need to accelerate the roller (lets call it a (measured in rad/s^2))

d) also you need to know the rotational moment of inertia (do a search - you'll find it) (lets call it E for now)

e) Use T=Ea to calculate the torque required to accelerate your thing

f) Add the two T's (one calculated in b one calculated in e) and multiply by a safety factor

h) Then go and buy the strongest motor your budget allows.

cheers

KPG