Tubular Needle Type Cold Press Needle Wire Stripping And Usage

The use of tubular needle type crimp contact looks simple, but details determine success or failure when actually operating crimp contact pin. Choosing the right tools and mastering the skills are the key, let's do it step by step.
In terms of tool preparation, the wire stripper must match the thickness of the wire. If the wire is too thin, it is easy to strip the copper wire, and if it is too thick, the insulation layer will remain. Choose color-coded wire crimping pliers, red corresponds to 0.5-1.5 square millimeters, blue corresponds to 1.5-2.5 square millimeters, and yellow labels handle 4-6 square millimeters of thick wire. Needle-nose pliers are prepared to adjust the shape, and diagonal pliers are used to trim burrs. Multimeter is essential, and the conduction must be checked after crimping.
There are three common errors in the wire stripping process: stripping too short will result in insufficient exposure of the metal part, stripping too long will easily press the insulation layer, and the copper wire will spread out and reduce the contact area. The correct operation is to strip the wire length 2 mm longer than the contact socket crimp metal tube, for example, if the crimp contact female tube is 8 mm long, strip 10 mm wire. The copper wire should be twisted into a tight strand without forks.
Pay attention to the direction when inserting the wire, with the barbed open end facing outward. The wire head is in place only when it hits the metal baffle at the bottom of the tube. At this time, the copper wire should not be visible from the outside. If the wire is too soft to be inserted, use needle-nosed pliers to clamp the wire head and rotate it to push it in, don't force it.
The crimping position must be accurate, and the crimping pliers are stuck in the crimping area marked with crimp contact male. Hold the handle with both hands and apply force at a constant speed. When you hear a "click" sound, it means that it is pressed in place. Shake the wire after crimping. If crimp socket contact shakes with it, it means that it is not pressed tightly and needs to be crimped again. The crimping mark is qualified if it is a regular rectangular depression. If there is a diagonal pattern or the indentation is too deep, it is considered a failure.
Three checks must be done after crimping: visually check that there is no gap between the wire and female crimp contact, hand pull test to withstand 3 kg of tension without falling off, and multimeter test that the on-resistance at both ends is less than 0.5 ohms. If poor contact is found, it must be cut and redone, and male crimp contact cannot be crimped twice.