Cutting, Stripping and IDC Crimping UL1007 18 AWG Wires
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Cut, Stripped, Striped and Tin Dipped
Table of Contents
Cutting, stripping and IDC crimping a wire harness is a simple job to complete, and I’ll go through each step to describe exactly what’s happening. UL1007 18 AWG hookup wire arrives on a spool, gets cut and stripped on a wire processing machine and gets crimped through the insulation into a terminal-housing. Once the wires are cut and stripped on the machine they get crimped into the house but a quick conductivity test is important on IDC crimps and I’ll let you know why as I move through this harness.
UL1007 18 AWG Wire
Underwriter’s Laboratories (UL) tests and approves 1007 to 300 volts and 105°C, then approves that the manufacture can in fact produce hundreds of thousands or millions of feet at a time. Customers and end users see the UL1007 style printed on the insulation and know that it’s been tested and approved by not only the manufacturer but also the third-party approval source.
The American Wire Gauge (AWG) is the thickness of the copper or the overall thickness of multiple strands of copper. For instance, the outer diameter of UL1007 18 AWG wire is approximately 0.081” and the insulation thickness (set based on voltage and temperature ratings) is 0.016” on both sides. The copper underneath the insulation is 0.049” (or .081 - .016 - .016), whether it’s solid or stranded. It’s been determined that a solid strand of copper at 0.049” thick will conduct the same amount of electricity as 16 strands of copper wound together with an overall diameter of 0.049”.
This wire uses tinned copper strands rather than bare copper as well, so the strands, when exposed, could appear to be silver when they aren’t. To help with the soldering process later, copper strands are commonly coated with a layer of tin so that it slightly melts when heat is applied.
Cutting and Stripping UL1007 18 AWG Wire
The cutting and stripping process is completed at the same time on the wire processing machine. In this case, the insulation is only stripped on one end at 0.25” in preparation for the end user. The other end will get IDC crimped directly through the insulation, explained in the paragraph below. Some things to look for in the cutting process are measurements, scrapes on the PVC insulation and scrapes on the copper strands. Roughly 5% of the pieces should be measured during the cutting process after the machine operator is sure that the machine is set to the correct settings.
The blades that cut and strip the wire need to be set to crunch down to 0.049” as stated above when I mentioned the diameter of the copper inside the insulation. However, it’s very important that the machine doesn’t push the blades too far down causing strands to cut or get scraped. It’s easy to see a scraped tinned copper strand because the tin will be removed and a copper (brass look) will appear in plain view. Cut, broken or scraped copper strands can change the current, conductivity and overall settings for the end user’s application, so it’s important to put these items on a checklist for the machine operator to be aware of as they cut the wires.
IDC Crimping UL1007 18 AWG Wire
Insulation Displacement Crimping (IDC) is the process of pushing the wire into a V-shaped metal blade until the insulation is broken and the copper conductor meets the metal. Later, when this wire harness is plugged into an electronic device, it will be looking to run current through the metal and through the copper conductor to meet another connection on the other side. It’s the responsibility of the wire harness manufacturer to be sure there’s a current running through this harness, so an electronic conductivity test will suffice in terms of quality control. The video shows how the wire is pushed in to a level of 0.049” which is just enough to break through the insulation and meet the copper conductor. But again, the conductivity test will assure quality and allow the assemblers to be positive that the assembly is manufactured to the customer’s specifications.
Final Quality Control Check
When purchasing wire harnesses or cut and stripped wire from a contract manufacturer you can be assured that they have a quality process in place by asking if they’re ISO 9001 certified. It’s an international standard for quality that organizations follow to make and ship a quality product every time. For example, a quality management system would typically request a first article approval from the customer which takes a significant risk off the table immediately. Upon approval, the manufacturing process begins with a manager signing off on the first piece, as a sample for the assemblers to view as they work. From there, in-process quality checks are completed and signed on a quality inspection report that check measurements, damaged wire or parts, part numbers and electrical conductivity. Finally, the manager spot-checks the lot and signs a final quality check at the end of the process.
The ISO 9001 certificate is gained through a difficult training process in the initial stage, and audited annually to be sure that the company still complies with the standard. Also, continuous improvement initiatives are mandatory, forcing companies to prove that they are documenting errors and using their data to improve processes going forward. Stagnancy is not acceptable in the world of international standards compliance. You can rest assured as a customer when in the hands of a veteran ISO certified company, not only that they meet the standard obligations, but also that they improve on a yearly basis to further support their biggest stakeholder of long term sustainability, their customers.