Cold-pressed Needle Crimping Device: Why The Copper Wire Must Reach The Bottom During Stripping And Crimping
Why Full Wire Insertion Matters
When using a Cold-pressed needle crimping device, the copper conductor must be inserted fully into the terminal barrel before crimping. If the wire does not reach the bottom, the crimp may appear acceptable externally while creating poor electrical and mechanical performance.
A copper wire should always reach the bottom of the terminal when using a Cold-pressed needle crimping device. Full insertion ensures maximum conductor contact, stable pull-out strength, lower resistance, and consistent contact crimping quality.
Risks of Incomplete Wire Insertion
A partially inserted conductor can create several problems:
- Increased contact resistance.
- Reduced pull-out strength.
- Intermittent signal transmission.
- Premature terminal failure.
- Higher maintenance costs.
Even a small insertion gap can significantly affect connection reliability in vibration-prone environments.
Inspection Points Before Crimping
Verification Steps
Before operating a contact crimper, the following checks are recommended:
- Confirm the stripping length matches terminal specifications.
- Ensure no copper strands are missing or damaged.
- Verify the conductor reaches the terminal stop position.
- Check that insulation remains outside the crimp area.
| Inspection Item | Acceptance Standard | Result |
|---|---|---|
| Strip Length | Within specification | Pass |
| Copper Strand Condition | No damage | Pass |
| Wire Insertion Depth | Reaches terminal bottom | Pass |
| Insulation Position | Outside crimp zone | Pass |
Effect on Connection Reliability
A properly inserted conductor allows crimping force to distribute evenly across the terminal barrel. This improves electrical conductivity and mechanical retention. Many connection failures originate from insufficient insertion depth rather than tool malfunction.
Application Example
During assembly of signal connectors, a d sub contact crimper can produce consistent results only when the stripped conductor fully contacts the terminal stop. Tests often show higher pull-force values and lower resistance when insertion depth is correctly controlled.
