Elimination OF Abrupt Mechanical Shock Loading

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Discussion Overview

The discussion centers on the challenge of mitigating abrupt mechanical shock loading when an 850 kg machine comes to a sudden stop at the end of a tether. The scenario involves ramps inclined at 20 degrees and a request for calculations to size an appropriate in-line spring for shock absorption.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant describes the problem of an 850 kg machine coming to an abrupt halt and seeks spring sizing calculations.
  • Another participant suggests using block-and-tackles as a safer alternative to reduce shock loading.
  • Concerns are raised about the inability to provide accurate spring calculations due to unknown variables in the described scenario.
  • A later reply emphasizes the safety implications of the project and states that advice cannot be provided on the topic.

Areas of Agreement / Disagreement

Participants express differing views on the safety and feasibility of the proposed methods, with no consensus reached on how to proceed with the project.

Contextual Notes

The discussion is limited by the lack of detailed circumstances surrounding the machine's operation and the inherent risks involved in the project.

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It's a problem of reducing an abrupt shock load as an 850 kg runaway machine trundles down ramps, and comes to an abrupt halt at the end of its tether fixed to a van's tow hitch. Ramps fixed to the van's rear door sill incline at 20 degrees to ground level and their length is 2.5 metres. I need to pass on figures to size a suitable in-line spring.
 
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Why not use block-and-tackles to lower it gently? That sound much safer.

If we give you a spring calculation, it might be wrong because we can't know all the circumstances no matter how much you describe it.

We don't allow discussion of dangerous topics here on PF.
 
anorlunda said:
Why not use block-and-tackles to lower it gently? That sound much safer.

If we give you a spring calculation, it might be wrong because we can't know all the circumstances no matter how much you describe it.

We don't allow discussion of dangerous topics here on PF.

This is not an existing current risk which has been resolved with a valid working tether used as a backup to a self propelled machine that is successfully being driven down ramps under its own power. I am trying to improve the tether---should on the unlikely off chance it be needed--- by reducing its shock load with a suitable spring. There are no further circumstances to describe? It is a straight forward 850kg mass down a 20 degree incline requiring buffering on a tether. (KISS)
 
Sorry, it involves the safety of people and equipment, so we can't really offer you advice on your project. Thread is closed.
 

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