Two-Point Taping of Small Wire Coils: Check the Fixture Before the Machine

For a small finished coil, the first selection question is whether the loaded fixture fits the complete tape-wrapping path. A machine’s wire-bundle range alone does not answer that question. Measure the coil, fixture and moving tape head together at both wrap points; clearance on an empty fixture does not establish clearance during a loaded cycle.

This application note is based on an anonymized inquiry. The dimensions below are customer-reported requirements. No completed machine trial or customer acceptance result is reported here.

Define the part at the taping station

The requested job uses approximately 1 mm outside-diameter plastic-coated steel wire, cut to 48 inches (about 1,219 mm) and already wound into a coil with a reported inside diameter of 32–38 mm. The existing winding process is satisfactory. The operator wants to secure that coil with two tape bands approximately 180° apart while it remains on a removable fixture.

Dimension or feature	Why it matters	Evidence to collect
Individual wire OD	Identifies the material; does not size the taping opening	Coating and wire specification
Bundle width and thickness at the band	Determines what the tape must surround	Measurements with the coil held in its working shape
Coil inside diameter	Limits access through the centre of the coil	Smallest opening with the fixture installed
Fixture arms and support blocks	May obstruct the rotating head or tape path	Dimensioned loaded-fixture drawing and all-side views
Band width and overlap	Determines coverage and whether the coil remains secure	An accepted manually taped sample

Our WM-4105 spot-taping workstation lists a 3–12 mm taping diameter and 15–45 mm tape width. Treat those as screening limits. They do not establish that a 32–38 mm coil opening can accommodate the head, tape path and fixture together. An irregular bundle also needs more description than a single equivalent diameter.

Compare three ways to hold the coil

Route	When to evaluate it	Main question before committing
Keep the existing removable fixture	Its openings expose both band locations	Can the fixture enter and leave without contact throughout the wrap?
Modify the fixture	A support arm blocks an otherwise accessible band	Can support move without releasing stored spring force or changing coil shape?
Make a dedicated locating nest	Repeat positioning is difficult or the existing fixture cannot fit	Can the nest retain the coil while leaving a complete tape path?

If none provides sufficient clearance, review the taping equipment range or a custom fixture and binding approach. A larger machine is not automatically a solution for a small centre opening.

Trial the complete two-band operation

The requested sequence is: load the fixture, trigger the first band, rotate the fixture 180°, trigger the second band, then unload. Confirm the trigger arrangement on the chosen configuration. Include the operator’s repositioning time when measuring output; tape travel speed is not completed coils per hour.

Before a powered trial, our engineering team needs to check the full swept path with the fixture secured. The trial record should then include:

• material and fixture identifiers, tape type and width, wrap settings and machine configuration;
• a continuous view of loading, both wraps and unloading, plus close views of the finished bands;
• the agreed sample count, tape-position tolerance and criteria for tail adhesion, coil shape and coating damage;
• elapsed time, accepted coils, rejected coils and the reason for each rejection.

The limits and sample count must be agreed for this application; they are not inferred from a single attractive sample. Use our sample-trial checklist to keep the drawing, settings and finished samples connected.

Send the coil and loaded-fixture dimensions so we can evaluate access and define the trial before confirming a machine.