Surface Texture – Contour

Measuring Instruments

Software

Data processing software

Contour Profile Measurement and Analysis System

Pitch calculation Input range

Pitch calculation Calculation result

Master ball calibration unit

Since the probe moves in a circular motion vertically around

the support on the contour measuring instrument's probe arm,

error will be produced in the X-axis data because the probe

tip position also moves in the X-axis direction. These error

elements must be corrected in order to achieve high measur-

ing accuracy. The ACCRETECH contour measuring system

performs calibration using a master ball calibration unit which

enables simple circle error as well as tip R error calibration.

Masterball calibration function

Circle Correction Calculation

Although the contour measuring instrument's probe tip is R-shaped, tip R-correction is indispensable for high measuring accuracy.

Measurements are taken from the center of probe tip R and correction is performed by offsetting in the normal direction at 11 dividing

points on the tip. Though there is no problem with fixed quantity correction when probe tip R is near maximal generalized roundness

zero, large errors can occur in the correction amount due to tip R processing tolerance error or wear after long term use.

Tip R-Correction

Stylus calibration is performed by the masterball calibration

unit. During masterball measurement and level difference

measurement, tip R correction and arc error correction can

be executed automatically or manually. The wizard takes you

through all necessary steps in the

following order: calibration condition (inputting reference

value) setting, placement of the calibration unit, confirmation

of measurement start point, and execution of calibration.

Stylus Calibration Wizard

Calibration can be specified at any time.. In addition to the

stylus replacement time, a calibration alert based on mea-

surement frequencies or elapsed time is displayed periodically,

ensuring accurate, stable measurement on a continuous basis.

Calibration Alert

When analyzing the same profile repeatedly, it is possible to

switch from manual operation to targeted analysis during CNC

execution by setting the condition for recalculation, enabling

detailed analysis.

Calculation Point Manual Input

For the same multiple profiles composed of circles and straight

lines, the pitch between line intersections or the pitch between

circle centers can be automatically output just by specifying

the arc with the mouse. Analysis efficiency can be improved by

using the dimension line auto output function at the same time.

Pitch Calculation Function

Workpiece

height

X-direction deviation

Probe arm support

Figure b

Profile when new

Profile after wear

Master ball correction screen

Probe

Probe R center locus

Probe R center locus

Probe R-correction

only in normal direction

Post-correction data

Figure a

62

TOKYO SEIMITSU