Common engineering questionsWire and cable measurement FAQ
These answers provide a starting point. Final capability depends on the product construction, process, required accuracy and repeatability, machine geometry, and integration plan.
Which system measures wire or cable OD and ovality?
A laser micrometer measures external dimensions without touching the product. A single-axis gauge measures from one direction. A dual- or triple-axis gauge measures from two or three directions, making ovality and shape variation easier to see without depending as much on product rotation.
Can one laser micrometer measure several parallel strands?
Yes, when the strand sizes, spacing, and presentation are compatible. A horizontal multistrand roller guide or custom spaced fixture keeps the strands separated and aligned as they pass through the laser micrometer. Total Vu Multi-Strand software can then display a separate diameter measurement for each strand. This is different from measuring the combined outside envelope of a twisted or fully assembled cable, so the strand count, diameter range, spacing, speed, and guide design should be reviewed.
Where should diameter gauges go on a two-head taping line?
A gauge before the first head establishes the incoming twisted-pair or cable geometry. A gauge between the heads isolates the dimensional buildup produced by the first tape layer, and a final gauge verifies OD and ovality after the second layer. Not every line needs all three stations: a before-and-after arrangement may be sufficient when intermediate access is limited or only finished dimensions matter. These stations measure external geometry and dimensional buildup; they do not directly measure one-sided tape thickness, overlap, or adhesion.
Can a laser micrometer measure insulation wall thickness?
Not directly. A laser micrometer measures external diameter. Two OD stations can calculate dimensional buildup by comparing the bare conductor with the coated product, but direct wall thickness and concentricity require a compatible ultrasonic or other wall-measurement method.
What is the difference between concentricity and ovality?
Ovality describes how much the outside shape differs from round. Concentricity describes how centered one layer or conductor is inside another. A cable can have a stable OD and still have uneven insulation wall if the conductor is off-center.
When is FlawSense needed instead of a laser micrometer?
A laser micrometer is the right tool for external dimensions and can flag defects that create a measurable OD change. FlawSense is used when the application needs a 3D surface map of localized raised or lowered flaws that may not produce a reliable overall diameter change.
Does FFT software directly measure structural return loss?
No. FFT analyzes repeating dimensional patterns in measurement data. Those patterns can identify process mechanics or geometry associated with SRL risk, but FFT does not directly perform the electrical return-loss test or replace cable certification.
Why measure individual strand tension instead of total tension?
A correct total value can hide an uneven distribution. Some strands may be too tight while others are too loose. Individual sensors show the balance across the strand bundle so the source of instability, breakage, or geometry variation is easier to identify.
What is the difference between RTM X42 and RTM MP Plus?
RTM X42 is designed to monitor tension across many individual strands. It can support displays, limits, reports, PLC integration, and optional brake control. RTM MP Plus sends a smaller mix of encoder, on/off, analog, and limited force-sensor signals from rotating equipment to stationary controls.
Does tension monitoring automatically control tension?
No. A monitoring system measures and reports tension. Automatic adjustment requires a compatible control system, brake or drive hardware, machine safeguards, and a reviewed control strategy.
What information is needed to size a wire tension sensor?
Start with minimum and maximum material tension, pulley diameter and weight, wrap angle, entry and exit geometry, speed, mounting space, environment, and required output. For rotating machinery, also provide the machine type, payoffs, bays, cradles, strand count, available power, PLC, reporting, and control requirements.
Can the systems connect to an existing PLC or quality system?
Often, yes. The available path depends on the selected LaserLinc or FMS hardware and software. Define whether the plant needs analog signals, an industrial network, OPC UA, recipes, reports, alarms, raw data, closed-loop control, or enterprise connectivity during application review.
