Can a Linear-Coil Spring Improve the Accuracy of a Weighing Machine?

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SUMMARY

The discussion centers on improving the accuracy of a weighing machine utilizing a linear-coil spring. The current setup employs a board attached to springs, which leads to uneven force distribution when weights are applied. A proposed solution is to replace the board with a basket suspended from the spring, allowing for more uniform force distribution. Additionally, the design principles of a 2-pan Roverbal balance are suggested as a reference for achieving consistent weight measurement regardless of weight placement.

PREREQUISITES
  • Understanding of linear-coil spring mechanics
  • Familiarity with potentiometer-based weighing systems
  • Knowledge of force distribution principles
  • Basic concepts of balance scales and their operation
NEXT STEPS
  • Research the design and operation of 2-pan Roverbal balances
  • Explore the mechanics of linear-coil springs in detail
  • Investigate methods for achieving uniform force distribution in weighing systems
  • Learn about potentiometer calibration techniques for improved accuracy
USEFUL FOR

Engineers, product designers, and anyone involved in the development or optimization of weighing machines and measurement systems.

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Project: Weighing machine based on potentiometer
Principle: On changing the length of the wire current in the circuit will change which will change the deflection in the ammeter

Set up: On top of four or three spring(same spring constant) a board is attached so when a weight is kept on top of it, the spring will compress and Jockey/slider attached with the board will slide on the wire and length changes

Problem: the problem is that when a weight is kept on top of the board, the spring tries to bend and the distribution of the force is not uniform. So is there a way out so that the force of the springs will be uniformly distributed and the spring will not bend?
 
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is there a way out so that the force of the springs will be uniformly distributed and the spring will not bend?
A linear-coil spring is usually more laterally stable on expansion rather than compression.
Replace board with basket - suspend basket from spring - put weights to be measured in basket.
There are many designs that do what you want with your equipment - eg. look at how a 2-pan Roverbal balance works (with those it does not matter where the weights are placed in the pan: how do they do that?)
 
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