Measurement, Quality & Compensation
Probing, tolerancing, surface quality, datum control, offsets, wear, and correction loops.
Angular Tolerance
Permissible deviation of angular dimensions.
Calibration
Adjustment to keep measurement or equipment accurate.
Caliper
Common length measuring tool.
Characterization
Process of establishing measurement references or parameters.
Circular Runout
Runout deviation of a single cross-section during rotation.
Clearance Fit
Fit where hole size is larger than shaft size.
Coaxiality
Deviation in concentricity between two axes.
Coordinate Measuring Machine (CMM)
High-precision spatial measuring equipment (CMM).
Cylindricity
Overall deviation of a cylindrical surface.
Datum
Reference feature used for inspection or machining.
Datum Measurement
Dimensional measurement based on datums.
Dial Indicator
Pointer-type displacement measuring instrument.
Dimensional Tolerance
Permissible deviation for a nominal dimension.
Fit
General term for hole-shaft fit relationships.
Flatness
Deviation of a surface from an ideal plane.
Gauge Block
Standard length reference block.
Geometric Tolerance
Control of allowable shape and position deviations.
Height Gauge
Instrument for height measurement and layout marking.
Inspection
Measuring and evaluating dimensions and quality.
Interference Fit
Fit where hole size is smaller than shaft size.
Laser Tool Setter
Device that measures tools using a laser.
Measurement Coordinate Alignment
Aligns measurement coordinates with machining coordinates.
Measurement Uncertainty
Evaluation of the confidence range of measurement results.
Measuring Instrument
General term for various measuring instruments.
Micrometer
High-precision length measuring tool.
Off-Machine Measurement
Measurement performed outside the machine.
On-Machine Measurement
Measurement performed on the machine tool.
Parallelism
Deviation from parallelism to a datum.
Perpendicularity
Deviation from perpendicularity to a datum.
Pitch Error Compensation
Compensation for leadscrew pitch error.
Position Compensation
Compensation used to correct positioning error.
Position Tolerance
Deviation of a feature position relative to a datum.
Profile Tolerance
Deviation of a line or surface profile.
Quality Control
Management activities ensuring stable product quality.
Ra
Arithmetic average roughness parameter.
Repeatability
Accuracy of repeatedly returning to the same position.
Rework
Corrective machining performed on nonconforming parts.
Roundness
Circularity deviation of a circular cross-section.
Rz
Maximum roughness height parameter.
Straightness
Straight-line deviation of a linear feature.
Surface Quality
Comprehensive indicator describing surface condition.
Surface Roughness
Measure of microscopic surface irregularity.
Surface Texture
Pattern left on the surface after machining.
Thermal Error Compensation
Compensation for errors caused by temperature rise.
Tolerance
Permissible range of dimensional deviation.
Tolerance Stack-Up
Dimensional relationship formed by multiple chained dimensions.
Tool Diameter Measurement
Measurement of tool diameter for compensation.
Tool Length Measurement
Measurement of tool length for compensation.
Tool Presetting
Pre-measuring and setting tools outside the machine.
Tool Setter
Device used to measure tool length or diameter.
Tool Setting
Process of establishing tool offset relative to workpiece zero.
Tool Setting Block
Reference block used for manual tool setting.
Tool Wear Compensation
Corrects deviation caused by tool wear.
Total Runout
Total surface runout deviation during rotation.
Touch Trigger Probe
Probe that triggers a signal on contact.
Transition Fit
Fit condition between clearance and interference.
True Position
Geometric tolerance that controls feature location relative to datums.
Workpiece Alignment
Adjusting the workpiece to align with datums.
Workpiece Probe
Probe for on-machine workpiece measurement.
Yield Rate
Ratio of qualified products to total output.