I am currently working on designing a conveyor for feeding 1t material to a furnace. Not going into detail of how it works, I would just like to confirm my approach.(adsbygoogle = window.adsbygoogle || []).push({});

Goal: To move 1000 kilograms of mass using steel rope/pulley system. Determining power requirement

It would be a bucket mounted on two wheels running at a very low speed (0.3 m/s) over a mild steel I-beam. From literature around the internet, friciton values are:

mild steel on mild steel (0.74 static, 0.6 dynamic)

rail wheel on steel rail rolling resistance 0.0020

I am calculating power as follows:

Speed desired: 0.3 m/s

Time to achieve the speed: Not important but taking it to be 1s

Mass to be moved: 950 kg + bucket assembly (~50 kg) = 1000 kg

Friction to be overcome while driving: 1000 x 9.8 x 0.002 = 19.6N (2 wheels so 39.2N)

Force to move the mass from rest: F=ma > F=1000 x (0.3-0/1s) = 300N

Total force= 340N

Power required: F x v = 340 x 0.3 = 102 W or 0.13 hp

Am I missing something ? I am a bit skeptical about finding force required to move the mass from rest as it uses the static friction value of 0.72 which makes the required power go up by a large amount.

Regards

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Is my power calculation correct?

**Physics Forums | Science Articles, Homework Help, Discussion**