Suspension Cable Length Tolerance via Controlled Stretching
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Solution Overview
Problem
Current methods for manufacturing suspension cables fail to achieve the required tight tolerances necessary for applications like rope shovels and draglines, where deviations can lead to inefficiencies and damage.
Innovation Solution
A method involving stretching the cable to a desired percentage of its rated breaking strength, measuring its length, and determining the position of a final pin hole within a predefined tolerance, followed by machining to create the pin hole, allowing for precise adjustment and adherence to tight length specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current manufacturing methods are used for suspension cables, then the manufacturing process is simple, but the length tolerance is too loose (greater than 1 inch for 176 feet cable)
Solution Approach 1:
The cable is stretched to a desired percentage of its rated breaking strength before final assembly to pre-establish the correct length and tension characteristics, ensuring that when installed, the cable will be at the proper length without requiring complex post-manufacturing adjustments
Solution Approach 2:
The method changes the physical state of the cable by applying controlled tension (stretching to a percentage of breaking strength) during manufacturing, which permanently alters the cable's length and tension parameters to achieve the required tight tolerances
2Manufacturing precision
If the cable is stretched to a high percentage of breaking strength, then the length precision is improved, but the risk of cable damage increases
Solution Approach 1:
The cable is stretched to a desired percentage of its rated breaking strength (not necessarily 100%), which provides sufficient length precision while maintaining a safety margin to prevent actual damage. This partial action achieves the required precision without excessive stress
3Reliability
If tight tolerances are required for cable length, then the performance and durability are improved, but the manufacturing complexity increases
Solution Approach 1:
The pin hole position is determined based on the measured cable length after stretching, allowing the manufacturing process to self-adjust to achieve tight tolerances. This preliminary measurement and determination step ensures reliability without requiring overly complex control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the production of suspension cables with precise lengths and tolerances, enhancing their performance and durability in demanding applications by ensuring accurate fitting and reduced risk of damage.
Implementation Method 1
stretching the cable to a desired percentage of a rated breaking strength of the cable
Data Source
AI summary
A method for making a suspension cable to a desired length is provided. The method includes providing an initial pin hole on a tab of a socket associated with the cable. The method includes stretching the cable to a desired percentage of a rated breaking strength of the cable. The method includes measuring a length of the cable. The method includes determining a position of a final pin hole to be formed on the tab based on the measured length of the cable and a predefined tolerance. The method includes creating the final pin hole at the determined position.