Wire Stripping Defects: Causes and Corrective Actions

Stripping defects should be diagnosed from the failure pattern, not corrected by increasing blade depth until the insulation comes off. An aggressive correction may hide incomplete stripping while creating conductor damage.

Defect-to-cause matrix

Symptom	Likely causes	First checks
Conductor nicks	Excess depth, off-center cable, ovality, wrong blade profile	Magnify nick location and compare around circumference
Incomplete insulation removal	Insufficient depth, dull or contaminated blade, inadequate pull	Inspect cut line before changing pull distance
Pulled or broken strands	Blade contact, excessive pull, loose strand lay	Count strands and inspect both cut and pull direction
Insulation stretching	Soft material, heat, dull blade, excessive clamp pressure	Stabilize material temperature and inspect blade edge
Strip length variation	Feed slip, guide movement, cable compression	Mark cable and compare programmed movement with actual result
Roller marks	Excess pressure, unsuitable roller surface, contamination	Reduce pressure gradually and clean the feed path

Diagnose in a fixed sequence

1. Stop and retain failed samples in order.
2. Record machine program, blade, cable lot and approximate piece count.
3. Inspect the cut line under magnification before pulling the insulation away.
4. Change one variable at a time.
5. Produce a new sample set and record the result.
6. After correction, run long enough to confirm that the defect does not return as the blade and material warm.

Separate feed defects from blade defects

If cut and strip lengths vary together, investigate feed slip, guide alignment and cable compression first. If cut length is stable but the exposed conductor varies, focus on blade position and pull-off behavior. This distinction prevents unnecessary blade changes.

The WM-167 represents conventional programmable cutting and stripping. Large cable may need rotary separation such as the WM-193, where depth, concentricity and layer construction become more important.

Shielded cable needs additional inspection

A jacket can look clean while the braid underneath is cut. Open the shield and inspect the full circumference. If braid preparation follows stripping, a machine such as the WM-819 braid brushing machine should be evaluated as a separate process rather than using aggressive stripping to expose the braid.

See the coax assembly process and EV harness process for downstream risks. The case library distinguishes measured factory evidence from general guidance. For recurring defects, send failed and acceptable samples with the cable specification.