Torque formula to throw a mass with two pulleys and a belt

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Discussion Overview

The discussion revolves around determining the force (torque) required to throw a mass using a system of two pulleys and a belt, specifically in the context of a snowblower. Participants explore the necessary calculations involving density, mass, power, and the mechanics of the system.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants clarify that 500kg/m(3) is a density, not a mass or force, and emphasize the need for a collection of formulas rather than a single equation.
  • There is a suggestion to define the parameters of "throw," such as height and speed, and to consider air drag in the calculations.
  • One participant proposes calculating the mass of snow in a cylinder with specific dimensions to estimate the force needed for the pulley.
  • Another participant suggests that it may be easier to work with power rather than speed and acceleration, proposing the formula power = torque * RPM.
  • There is mention of available snowblowers with varying power ratings, indicating that the choice of equipment may depend on specific needs.
  • A participant expresses concern about the current setup not throwing snow effectively and indicates a need to change the pulley for better torque transmission.

Areas of Agreement / Disagreement

Participants generally agree on the need to clarify definitions and parameters for the calculations, but multiple competing views remain regarding the best approach to determine the necessary torque and power for the snowblower system. The discussion remains unresolved regarding the specific calculations and equipment adjustments needed.

Contextual Notes

Limitations include the need for precise definitions of terms like "throw," the dependence on specific measurements for the snowblower setup, and unresolved calculations regarding mass and force.

jayjay
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Hey guys
What's is the formula to find the force(torque) to throw a mass in the air that is 500kg/m(3) with 2 pulley and a belt.
Thanks
 
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jayjay said:
ok so i need to find the mass like in kg? like for an exemple a 5 gallon bucket full of snow

Yes. More important, you need to define "throw" numerically. How high? How fast? Is it fast enough that we need to consider air drag on the thrown object?
 
anorlunda said:
Yes. More important, you need to define "throw" numerically. How high? How fast? Is it fast enough that we need to consider air drag on the thrown object?

well just trying to figure out how much force i need to the pulley to throw snow with a snowblower. that's why i found 500kg of density of snow in the snowblower cylinder that is 14 inch diameter and 5 inch deep roughly. but i might be wrong.
maybe this can't be solve.

also found that 1 cubic foot of water weight 62.4 lbs and they said snow weight around 30% of that.
so trying to calculate how many pounds of water in a cylinder that is 14 inch diameter by 5 inch.
that could give me a rough number in kg than found out how many force that pulley will need to throw that weight.
 
jayjay said:
well just trying to figure out how much force i need to the pulley to throw snow with a snowblower.
That puts in context. It is far easier to work with power than speed, acceleration and those equations of motion.

First, figure out how much power your snow blower needs? Then, power=torque*RPM is the remaining formula.

You can buy snowblowers in the store with power ratings from 2 hp to 15 hp or more. Which of those fits your need?
 
anorlunda said:
That puts in context. It is far easier to work with power than speed, acceleration and those equations of motion.

First, figure out how much power your snow blower needs? Then, power=torque*RPM is the remaining formula.

You can buy snowblowers in the store with power ratings from 2 hp to 15 hp or more. Which of those fits your need?

i have everyting settup already but it doenst throw snow so i have to change the pulley and that's why i want to make sure i have the right pulley for the troque

you'll understand better with the video
there's a shaft with 2 3inch pulley that trasmit the torque but they are to small
 

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