How to use a wire gauge offline ?
CERSA MCI introduced its LDS range initially to measure very fine wires. How to measure these wires without distorting them as with conventional devices ? Diffraction technology was the solution because it provides a very high accuracy to measure wire diameter without any contact independently of the wire vibration. The other 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
The first 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 operator who performs the measurement. It is also very complicated to keep the sample sufficiently taut during rotation, especially for super-fine wires.
The second solution is to fix the sample on a support. Then either rotate the sample automatically around its entire circumference or rotate the measuring instrument around the sample. CERSA has chosen to develop an accessory called WSR (Wire Sample Rotation) able to hold the sample efficiently and to rotate it 360° while the measuring device calculates the different diameters in order 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
To measure wire thickness and ovality, CERSA has developed two versions of its accessory :
· WSR-F : for wires less than 100µm
. WSR-S : for wires from 50µm to 450µm