Slack string on linear slides when using a different slide lengths

  • Thread starter Quietrabbit
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Quietrabbit
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String slack possibly because of different length linear slides?
We have multiple 400mm length linear slides as used in the FIRST tech challenge robotics. However, our very last and innermost set of slides are 300mm length mounted such that they are not closer to the end of the extension (the black slides in the picture). We are having a lot of trouble keeping the string tensioned regardless of if we use springs (not currently in the photo). We were wondering if the two different extension length slides we used would contribute to this but we’re not sure why that would be. I would love to elaborate on this further but I’m not sure what details would be important.
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Quietrabbit said:
We have multiple 400mm length linear slides as used in the FIRST tech challenge robotics.
Please provide a web link to the "FIRST tech challenge robotics", so we can see how the slides are arranged.
 
  • #3
Quietrabbit said:
... We were wondering if the two different extension length slides we used would contribute to this but we’re not sure why that would be. I would love to elaborate on this further but I’m not sure what details would be important.
We neither.
Please, show us the whole picture in more detail.
 

1. What causes slack in the string when using linear slides of different lengths?

Slack in the string when using linear slides with different lengths typically occurs due to the unequal distribution of tension along the string. This happens because the slides might move at different rates or start at different positions, causing the string to have excess length on one part and not enough tension to keep it taut.

2. How can I prevent slack in the string on linear slides of varying lengths?

To prevent slack, ensure that all linear slides start from the same initial position and move synchronously. Using a tensioning mechanism like a spring or a tensioner pulley can also help maintain consistent tension throughout the string. Additionally, regularly checking and adjusting the tension and alignment of the slides can prevent slack from developing.

3. What are the impacts of string slack on the performance of linear slides?

String slack can significantly impact the accuracy and repeatability of movements in linear slide systems. Slack can cause the movement to be jerky or uneven, which in turn can lead to errors in positioning. This is particularly critical in precision applications such as in robotics or CNC machinery where exact positioning is crucial.

4. Are there specific types of strings that are better at maintaining tension on linear slides?

Yes, certain types of strings are better suited for maintaining tension. Strings made from materials with low elasticity and high tensile strength, such as Kevlar or steel wire, are generally more effective. These materials are less likely to stretch under tension, which helps in maintaining consistent tension and reducing slack.

5. Can the use of software or automated systems help in managing slack on linear slides with different lengths?

Yes, using software or automated control systems can significantly help in managing slack. These systems can precisely control the speed and position of each slide, ensuring they move in unison and maintain proper tension in the string. Advanced systems can even dynamically adjust parameters in real-time based on feedback from sensors to minimize slack and optimize performance.

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