Braid Brushing vs Wire Untwisting: Choose the Right Cable Preparation Process

A braid brushing machine opens metallic shielding; an untwisting machine separates insulated wire pairs. Neither operation is the same as removing insulation. Choose from the required finished cable end, then identify the operations needed to produce it. For shielded cable, check whether the drawing also calls for jacket stripping or braid trimming; those are separate operations.

This distinction matters when searching for equipment: “wire brushing,” “wire straightening” and “cable stripping” can return machines that act on completely different parts of the cable. A photo of the incoming cable beside the required finished end is often the fastest way to remove the ambiguity.

Match the operation to the material

Required result	Process to specify	Equipment starting point
Open woven metallic braid into separated strands	Shield braid brushing or unbraiding	WM-819 braid brusher
Separate and straighten insulated twisted pairs	Cable pair untwisting and straightening	WM-1216 network cable untwister
Remove excess braid while retaining a specified shield length	Shield cutting or trimming	Shield-processing equipment
Open, trim and turn braid back for the connector	Combined braid preparation and fold-back	WM-181 brush, cut and fold-back machine
Remove jacket, shield and dielectric to stepped lengths	Multilayer cable stripping	Coaxial and multilayer strippers

A metallic braid, a spirally served shield and a foil shield have different structures. Send a close-up of the actual layers; do not use “shielded cable” as the complete material specification. Connector designs also require different shield terminations, as TE explains in its backshell selection guidance.

When the job is opening braid

Our WM-819 lists a brushing length of 10–200 mm. The setup must still match the exposed braid, cable construction and intended next operation. Establish brush engagement and handling with samples, then inspect the inner insulation and remaining strands.

Ask the trial to show the cable before brushing, the complete operation, and the result from more than one side. A wide fan of strands may be correct for one termination but unusable for a connector that needs a controlled fold-back. Define whether the output should be open braid, a gathered pigtail, an evenly trimmed sleeve or folded shielding.

When the job is separating twisted pairs

Our WM-1216 lists 10–60 mm of untwisting length. This describes the machine’s adjustment range. It does not define the acceptable untwist remaining in a finished Ethernet termination.

Keep the final exposed pair geometry within the connector instructions and applicable requirements. Fluke Networks’ connector-termination guidance explains the importance of preserving cable geometry near the connection. Evaluate the finished assembly using its required transmission tests; correct wire order and electrical continuity do not alone establish Ethernet performance.

For a mixed production batch, identify which products require pair separation and which require conductor-end twisting. These operations move the wire toward different finished conditions. Compare them in our twisting, untwisting and straightening category.

When the connector needs a folded shield

Start with the connector preparation drawing. Record jacket strip length, remaining shield length, fold-back location and the surface over which the shield must lie. Our WM-181 lists a cable OD range of 3–9 mm and a remaining shield length of 3–10 mm; use those limits to screen the application before a trial.

For other cable sizes or layer sequences, review the shield-processing range with the complete end drawing. A larger machine is not automatically the right one if its process removes a layer that the connector needs to retain.

What to include in an acceptance sample

Check the prepared length, loose strands, damage to underlying insulation, debris and whether the prepared cable actually fits the next connector or fixture. Time any manual gathering, trimming or cleaning still required after the machine cycle. Keep accepted and rejected samples with the settings used.

Send an incoming-cable photo, the required finished end and the connector drawing. We can then match the preparation sequence to the appropriate machine rather than relying on an ambiguous equipment name.