How to use a wire gauge off-line ?

CERSA MCI introduced its LDS range initially to measure very fine wires. How can one measure these wires without distorting them, as happens with conventional devices ? Diffraction technology was the solution because it provides a very high accuracy to measure wire diameter without any contact and independent of wire vibration. Another question was : how to calculate the ovality of a wire sample simply, accuratly, quickly and with a very good repeatability ?

A diameter and ovality gauge

One solution is to hold the sample in your hands and rotate it on itself in the laser beam and record the different diameters as you go along. The disadvantage is that this is not very reliable or repeatable because it depends on the technician who performs the measurement. It is also very difficult to keep the sample sufficiently taut during rotation, especially for super-fine wires.

The second solution is to mount the sample on a bracket, then either rotate the sample automatically around its entire circumference or rotate the measuring instrument instrument around the sample.  CERSA has chosen to develop an accessory called WSR (Wire Sample Rotation) that is able to hold the sample efficiently and rotate it 360° while the measuring device calculates the various diameters to obtain the ovality value. Rotation is done by hand. An internal angular coder renders the measurement insensitive to the rotation speed. It is absolutely not necessary to use a costly automatized rotation system! This high-precision laser micrometer therefore displays the average, min, max diameter and ovality of the sample with excellent repeatability and very high accuracy.

Solution for tiny wire measurement