3
$\begingroup$

We are looking for a solution to hold two Power cables on a 3D printed part. This part is installed in a vibrating environment. So we need the cables to be pressed not to move and not to transfer vibrations to electrical components. We have thought about a C shape holder, but it would surely not maintain cables enough. We also looked for components sold on the market but nothing meets our requirements. Here is a picture to help you to understand. Thank you in advance !

enter image description here

$\endgroup$
7
$\begingroup$

A clamp and strain relief are used all over the place. You'll see this everywhere from domestic electrical plugs to the cable exit of power tools.

The choice of cable and sheath/insulation is a factor too. For example, vehicle power cables are designed to handle vibrations (but also high temperature and to be light weight, so maybe not the perfect compromise for your use). Thinner cables might help you, so optimise that, perhaps. Similarly, the extra flexibility of finer stranded conductors would help, as might using multiple wires for each power rail, and using individual wires instead of multi-core cables.

Reducing the strain by way of a cable drag chain etc will mean the clamp can be less substantial, strain reliefs can be more flexible, and wear on the cable sheath reduced.

As with automotive and aviation electrics, use rubber grommets where cables pass through enclosures. Use cable sleeving on long runs subject to abrasion. Soldering wires can weaken strands when flexed, so crimp or fasten them instead. Do not tin (solder) wires that enter screw terminals, as it will loosen with time due to the softness of the solder; the same goes for crimp terminals. Instead, use bootlace ferrules.

In your position, it sounds like you'll need to experiment. Try a design, and when there's a failure, improve the design to address that specific weakness. You might need to use a tougher PCB, a tougher cable clamp, tougher connectors, more flexible cables, tougher sheaths. Look at other design solutions: connections between loud speakers' voice coils and terminals, other 3D printers...

When all else fails, glue-gun the heck out of it. It has been done! Electronics can be encapsulated in specialist epoxies to prevent vibrations weakening components' leads (among other reasons). Just remember to allow for heat dissipation - most circuit designs will have some components that are at their limit already.

| improve this answer | |
$\endgroup$
  • $\begingroup$ To add to Jodes excellent answer, Panduit Corp makes a large selection of cable routing / mounting products, you will want some type of cable hold down that screws on to the side of your enclosure so you will have to drill and tap a hole somewhere to mount the hold down . Also Microflex Inc has a large selection of very flexible silicone insulation hook-up wire, very good for vibration isolation. Good luck! $\endgroup$ – William Hird May 4 '16 at 19:59
  • $\begingroup$ Actually, we are not able to modify cables. They are two and separated. Our enclosure has to be adaptable to the existing wires. It is not easy to do and we have to find a solution that we can use, not depending on flexibility and diameters of both wires. $\endgroup$ – Mathilde May 9 '16 at 8:42
  • $\begingroup$ @Mathilde, you say nothing meets your requirements, is there more information you can add to your question? I'm not sure how anyone can help you further without knowing more abouthan your project, what it is, the constraints, etc $\endgroup$ – CL22 May 10 '16 at 22:32
  • $\begingroup$ The thing is that our product will be installed in a system where we can have small vibrations (I don't have any rate) and has to be adaptable to the existing system. Which means that we can't control the diameter of the existing wires or their flexibility. We have to find a solution to fix these wires for the vibrations not to be transmitted to the electronic components. I can't tell anything more, because we don't have more information... $\endgroup$ – Mathilde May 11 '16 at 7:31
2
$\begingroup$

I would suggest modifying your 3D printed part so that you can use cable lacing to secure the wires. It's how NASA builds wires into cables and harnesses for space vehicles. If it can withstand vibrations during launch, I'm pretty sure it would work for your application. I was lucky and learned from a retired NASA technician, but you should be able to figure it out from the NASA standard.

Reference chapter 9 of NASA-STD-8739.

| improve this answer | |
$\endgroup$
  • $\begingroup$ That is not a bad idea and would surely support vibrations ! But I don't really understand how I can integrate this solution to our product. The wires have to be fixed on this enclosure. And do we have to destroy it when we come for maintenance ? $\endgroup$ – Mathilde May 11 '16 at 7:34
  • $\begingroup$ Integrating this solution into your product is up to you. You've provided so little information and so few details, it's impossible to give a more detailed solution other than you'll have to make some modifications. Generally during maintenance or modification, the lacing is removed and replaced. With practice, it should not take very long. $\endgroup$ – DLS3141 May 11 '16 at 12:33
  • $\begingroup$ I can't provide more information, because we don't have more information. Our product has to be adaptable on a existing system, so adaptable to existing wires. This is kind of a challenge ! But thank you very much for your help. $\endgroup$ – Mathilde May 12 '16 at 7:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.