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Utilities Related to CMM Inspection

This page contains utilities that may be benificial for users of Coordinate Measuring Machines. All utilities are written in Javascript and produce a result from data input by the user.

Calculate Maximum Scan Speed

Controller Sample Rate:		ms
Desired Scan Point Density:		points per millimeter
Result:		mm/sec

The CMM controller samples points from an analogue probe at a fixed rate. If the scanning speed is faster than the maximum sample rate of the controller the resulting data is interpolated and may not be reliable. To maximize accuracy the scanning speed should not exceed the sample rate of the CMM controller.

Calculate Difference Between Points Parallel to an IJK Vector

Point X1:
Point Y1:
Point Z1:
Point X2:
Point Y2:
Point Z2:
Vector I:
Vector J:
Vector K:
Result:

This function calculates the signed difference between two points parallel to a specific vector. For PC-DMIS users this would be the same as the 'T' value.

Calculate Distance Between Points Perpendicular to an IJK Vector

Point X1:
Point Y1:
Point Z1:
Point X2:
Point Y2:
Point Z2:
Vector I:
Vector J:
Vector K:
Result:

This function calculates the distance between two points perpendiclar to a specific vector.

Expansion Error

Ambient Temperature (CMM and Part):		C
CMM Axis Expansion Coefficient:		um/m/C
Part Expansion Coefficient:		um/m/C
Result:		mm/m

This function calculates the expected error when measuring a part on a CMM with an environment other than 20 C. One assumption is that the axis and part temperature are the same. The resulting error is absolute or unsigned. Note: This kind of error can be corrected using temperature compensation.

Units Converter

Metric value:		mm
Imperial value:		in

Temperature Converter

Metric temperature:		C
Imperial temperature:		F

Convert between Azimuth/Elevation Angles and IJK Vector

Elevation:		deg
Azimuth:		deg
Vector I:
Vector J:
Vector K:

This function converts between azimuth/elevation angles and an IJK vector. The elevation angles are between -90 and 90 degrees. The calculated azimuth angle is positive between 0 and 360 degrees but signed azimuth input values are accepted.

Test Uncertainty Ratio (TUR) Calculator

Upper specification:
Lower specification:
Uncertainty (k=2):
Result:

This function calculates the Test Uncertainty Ratio. The input values for specification are independant of length or measured result. The uncertainty is the expanded uncertainty (k=2) assigned to the measurement. The lower specification for single sided limits should be set to zero.

Probe Deflection Force Converter

This function converts deflection force into an equivalent distance. Some inspection software use deflection force for analogue probes which can be difficult to interpret. When using an analogue probe for a defined scan it is important to know the real distances with respect to expected part errors otherwise data outside of the measurement window will be dropped.