Common Mistakes in Torsion Spring Design & Use
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- Опубликовано: 20 мар 2022
- There are 4 key Torsion Spring design flaws that can affect the performance of a torsion spring.
1. Incorrect direction of operation
2. Inside diameter too small
3. Body length too large
4. Overstressing
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This is a very informative and well presented lesson in torsion springs
Is their a specification for the correct dowel diameter vs spring ID? E.g. the dowel should be 10% larger than the shaft the spring is intended to ride on?
We can calculate how much the torsion spring ID will reduce in operation. It depends on the design of the torsion spring and how far the spring is required to deflect. It is important that the spring does not bind on whatever is on the inside of it as this will prevent the spring from working correctly and lead to the spring failing prematurely. If you need any help with a torsion spring design, please get in touch.
Hello sir, thanks for the video. I got one simple question, should a torsion spring deforms only in the direction of reducing it's diameter?
Is extending-diameter-way of operation is not appropriate for torsion spring?
Hello JM, glad you found it useful! Yes that's correct, a torsion spring should always operate in the opposite direction to the wind direction. For example, a right-hand (clockwise) wound torsion spring should work going anti-clockwise and a left-hand (anti-clockwise) wound spring should work going clockwise. Another way of thinking about this is the spring should always “close up” in operation. If a torsion spring operates in the wrong direction for its design, it will become overstressed very quickly and is likely to fail. Hope this helps!
@@JBSprings Thank you for your kind reply. It helped a lot. Have a nice day!
Could it be used to help retract a string?
No, that would be a clock spring, which can be found in a tape measure and many other things.
Is there a rule of thumb for stress limit in torsion springs? e.g. 80% of yield stress
Hi Michael, ideally you do not want the stress to go over 70% of the tensile of the material. However, with torsion springs, this is often difficult to maintain and in reality higher stresses can be accommodated. Allowances can also be made for the spring to take a set (effectively to be pre-stressed) in initial operation. If you need any help with torsion spring designs then please contact us.
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