The following discusses a simple and effective method of making your own cable strain reliefs.
You will need:
- 4:1 heat shrink tubing with glue lining (~1 ½” length).
- Step drill and/or reamer and a file for tuning our hole size.
- Nylon cable tie.
- Assorted M2 screws and M2 washers.
- Brass standoffs.
https://www.ebay.com/itm/Qty100-M2-Knurled-Brass-Spacer-Standoff-Female-Female-/182524389953
We first need to add 4:1 heat shrink to our cable.
When we shrink the heat shrink, we see the jacketed portion has a larger diameter than the stripped portion.
If this difference in diameter needs to be increased, add a short piece of heat shrink under the outer heat shrink.
For the left side of the heat shrink shown, 1/2 inch over the stripped wires should be adequate.
It is this portion that will be tied to a standoff.
Use a step drill to make a hole in the chassis back or side.
The cable hole fit should be tight; use a reamer or file to tune the diameter.
Four methods are shown for tying the cable.
Each method prevents our cable from turning or being removed from the hole in the chassis.
I prefer the ‘Brass standoff’ or ‘Brass standoff plastic nut’ method.
