How to Calculate RPM | How to Calculate RPM or Diameter of Driven Pulley |

N1 D1 = N2 D2

[thomasreber]

Nicely done, very clear and concise. Everything should be this understandable

[justinsmith]

Right, However couldn't help myself but to add that dividing the Pully ratio from the speed would simplify the problem as 120 ÷ 40 = 3 & 1420÷3 = 473.33

[slakjawnotsayin]

WOW, I almost asked if the RPM on a motor is from the shaft or the pulley on it, then realized the motor with or without the pulley is the same RPM regardless of how large the pulley is, and that the difference comes from the next pulley in line...

Figured I'd explain my ignorance incase anyone else asks the same question without logically thinking about it first...

Also, awesome vid and explanation, thank you!

[carmelitallego]

I really... really love this video...❤❤❤

[thingsbeensaidanddone.]

Hi, Thanks for nice and clear video . What about power ?
Since you run slower but you have more torque . Does that mean you can do a 2kw job with a 1, 5 kw electric motor ?

[dinesh.j]

Well done frnd
You make me clear the problem

[carmelitallego]

Excellent presentation thanks for sharing with us...🙏🏻💖

[bhimavaramdentalcare]

Mere paas ek pulley type air compressor hai, jis se tyre me hawa bharatha.
Isko 1hp wala (1500 rpm) AC motor hai, isko DC motor pe convert karke solar se chalana cahta hu, kitne volt(V), watts(W) ka DC motor chahiye, please guide me.

[dominocweber]

Do i need to convert the pitch diameters of pulleys from inches to millimeters?

[TheVcasf]

Hi, I just watched a video you posted on pulley size calculation. thank you for sharing.
If you would, I need guidance. I'm helping someone install a DIY microhydro system. We're using a multiple pulley system to achieve required rpm at alternator. Three shafts and four pulleys. The main driver needs to spin at 65 rpm to achieve 1300rpm at alternator pulley.
The higher the electric load on the alternator the more resistance and it slows the system down.
My question is, does installing a larger driver pulley help overcome the braking force that the alternator exerts when under load? or is my only option increasing force/power at driver pulley?
Would you mind if I sent you an email regarding the problem I'm facing?
I understand if you don't reply. Thank you anyway

[REVNUMANEWBERN]

I want to convert sprocket to sprocket with chain to pulley to pulley with cog belt, is there a conversion calculator anywhere that I can input the chain info & get the equivalent ratio in a pulley setup?

[MohibulIslam-bfeu]

very good sir,
very good sir,
thank you so much sir.

[Nazrul-Rana]

Should the pulley diameter be in inches or mm?Which one is correct?In some videos MM and in some videos inches.

[wrongfullyaccused]

Yes, but what if you are using inches instead of that blasted metric system?

[mr.rastogi]

If i have to Slow the speed of big wheel then what should I do..??

[beljannuenoz]

Is the formula still the same to calculate the rpm when the pulley has teeth?