Estimating force required in a hand operated plunger

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Discussion Overview

The discussion revolves around estimating the linear force required for a hand-operated plunger used in making String hoppers. Participants explore methods for mechanizing the process with a linear actuator and seek ways to quantify the necessary force.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests estimating the linear force by determining a typical person's arm strength and converting that to torque and linear force.
  • Another participant questions whether it is possible to measure the force directly on the handles of the plunger.
  • A participant expresses their novice status in measuring forces and seeks advice on how to measure the force on the handles, asking for recommendations on measuring instruments.
  • One suggestion includes using two force meters to measure the force applied to each handle and then summing the results.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants present different approaches and seek clarification on measuring techniques without agreeing on a specific method.

Contextual Notes

Participants mention limitations in their expertise, particularly in measuring forces, and the discussion includes assumptions about average human strength without definitive measurements.

skarthik94
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Santhagai+Machine.png


In the image attached, you can see a hand operated plunger for making String hoppers. The handle is rotated and the screw descends and plunges into to canister containing the batter.

To mechanize this process, one can use a linear actuator, but the catch is estimating the linear force required.

Can anyone provide some ideas to this?
 
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skarthik94 said:
To mechanize this process, one can use a linear actuator, but the catch is estimating the linear force required.

You can find an upper limit by finding a typical person's arm strength then converting that to torque and to linear force.

Are you not able to measure the force on the handles?
 
I majored in electronics, not mechanical engineering, so I am a novice to measuring forces.

Finding out average man's arm strength can be done.

How do I measure the force on the handles? Can you suggest which measuring instrument to use?
 
skarthik94 said:
I majored in electronics, not mechanical engineering, so I am a novice to measuring forces.

Finding out average man's arm strength can be done.

How do I measure the force on the handles? Can you suggest which measuring instrument to use?

You could use two force meters like this, and have one person pull each handle with one, then sum them.

http://www.chinatraderonline.com/scale/Fish-Scale/
 

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