Cable fatigue
Cable fatigue
(OP)
I have a devices that incorporates hand pieces that are used very rigorously , and I am experiencing a cable fatigue phenomenon. The hand piece is moving in circular motion on the patient body .The breaking point occurs at the entrance point of the cable onto the plastic housing.
I seek for a prompt solution to this cable fatigue problem as a first aid.I came to learn that my application needs a cable that could withstand both twisting and bending.
Redesign would take a lot of time but I need now some guidance on how to improve the situation with what I have.
I would appreciate your guidance and assistance on what would be the best way and fastest way to solve this problem.
A picture of the inside of the handpiece is attached.
Udi
I seek for a prompt solution to this cable fatigue problem as a first aid.I came to learn that my application needs a cable that could withstand both twisting and bending.
Redesign would take a lot of time but I need now some guidance on how to improve the situation with what I have.
I would appreciate your guidance and assistance on what would be the best way and fastest way to solve this problem.
A picture of the inside of the handpiece is attached.
Udi





RE: Cable fatigue
Some 'connectors' have a boot on them with becomes gradually more flexble the further out you get.
I've seen 'coil springs' used to similar effect.
What unique requirements do you have, cleanliness concerns or the like?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Cable fatigue
I need nothing special, but need it it avilable fast and to match to current plastic design with minimum changes.
Could you direct me to the connectors solution? does it come on top of the plastic sleeve?
Udi
RE: Cable fatigue
RE: Cable fatigue
http://heyco.com/products/sec_02/2-04.html
Not sure how to handle the twisting problem though.
RE: Cable fatigue
RE: Cable fatigue
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Cable fatigue
> reduce the incremental bending, i.e., keeping the deflection to less than ~10% of the incremental length. precoiled cable like telephone cord might work
TTFN
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RE: Cable fatigue
Thanks for your support-
brian- will look into the pig tail connector.Thnaks
Chicopee - I was referring to the inner conductors.This cable is comprised of 4 thick wires to conduct an RF signal and 8 thin ones for control.Usually the thinner ones break.
Kenat - I tried using a spring .it did extend the lifrtime of the cables but problem only moved downwarth...I can place a spring on all the cable length as it will stiffen it and it wont be comefortable for work.
IRstuff- the telephone cord might be interesting.can you give me alink to such wire or charachtristic as I am not from this field.
If you have any more ideas, you are most welcomed!
Udi
RE: Cable fatigue
A conical spring (or other way of gradually decreasing stiffness) may alleviate this or something like the specially designed items from Brian. Heck a simple leaf spring that gradually tapers aligned to the primary bending direction might work, but I don't think it's the best way.
Strain relief of this kind isn't exactly a new problem or idea. Try looking at similar items and see what they do for it.
http://www.cablescience.com/
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Cable fatigue
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Cable fatigue
RE: Cable fatigue
Multiple layers of heat shrink but with each layer being slightly shorter than the previous to give a gradual transition of stiffness.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Cable fatigue
Great Idea!
RE: Cable fatigue
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If we learn from our mistakes I'm getting a great education!
RE: Cable fatigue
Thanks again.
I was looking through "heyco" site, and I came about the following :
http://heyco.com/products/sec_03/3-17b.html
Whats the difference from what scotty had mentioned?
Udi
RE: Cable fatigue
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If we learn from our mistakes I'm getting a great education!
RE: Cable fatigue
2.Check out this conduit system for robots:
http://www.mtgmoltec.com/robotic.html
David Baird
Sr Controls Designer
EET degree.
Journeyman Electrician.