ANSI/AGMA 2116-A05 pdf free download.Evaluation of Double Flank Testers for Radial Composite Measurement of Gears.
5 Condition of the measurement system
5.1 System characteristics
The characteristics of the measuring instrument and readout system should be checked or verified before proceeding with artifact measurement.
5.2 Suitability for calibration
The instrument should be suitable for calibration and representative of the normal operating conditions.
5.2.1 Double flank tester alignment
Double flank composite testers must be checked for axis alignments on a regular basis. Axis alignment includes the cross- and inline- axis parallelism of the work holding and master gear mount. These mounts include but are not limited to such things as solid and live arbors, solid and live centers, or a combination thereof. Double flank tester alignment and methods must be within the original manufacturer specifications or AGMA 935- A05. The alignment accuracy must be adequate for the accuracy grade of gears being inspected, or by agreement between the purchaser and supplier. These tests should be done before calibrating the instrument linear measuring system.
5.2.2 Readout condition
Meter movements and chart recorders should be checked to the manufacturer’s specifications such as magnification, linearity, lost motion, and frequen- cy response. See AGMA 935- A05.
5.2.3 Checking load calibration
The checking load should be calibrated at the load used to check the actual gears. If the instrument has adjustable loads, then several loads throughout the range should be checked. Checking loads can be calibrated with a dead weight tester or an appropriate force gage. Double flank testers and methods must be within the original manufacturer specifications or AGMA 935- A05. The checking load accuracy must be adequate for the accuracy grade of gears being inspected, or by agreement between the purchaser and supplier.
5.3 Table load considerations
Consideration must be given to the size and weight of the gear being tested in relation to the capacity of the instrument being used. Oversize or overweight parts may deflect or change the instrument alignment. In such cases, instruments should be calibrated with a simulated load on the table. Gears with significant mass may also cause measurement deviations in the moving slide that are reflected in the instrument readout. The effects of driving methods such as center size, friction characteristics, and live or dead centers should be considered.
5.4 System frequency response
System frequency response dictates the maximum rate of inspection on the composite tester. Frequency response error primarily affects short wavelength errors (tooth-to-tooth deviation). The following conditions in the measuring system have varying effects on system frequency response: mass of moving head stock, response rate of the measuring system，lost motion, mechanical and electronic filtering, and rotational speed of the inspection cycle.
5.5 Tooling and gages
Any tooling or gage used in the set up or calibration of a measuring instrument shall be calibrated at suitable intervals.ANSI/AGMA 2116 pdf download.