CSS FY20-0008.pdf

CALIBRATION STANDARD SPECIFICATION

NAVAIR

FORCE AND TORQUE

CALIBRATOR

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

PAX CSS FY20-0008

DISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE, DISTRIBUTION IS UNLIMITED.

FEBRUARY 2025

CALIBRATION STANDARD SPECIFICATION

NAVAIR

FORCE AND TORQUE

CALIBRATOR

Prepared by:

Melanie Habiby Trevor Appler

Project Engineers

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

Table of Contents

1.0 Scope

1.1 General

1.2 Usage

2.0 Requirements

2.1 Electrical Power Source

2.2 Environmental Requirements

2.3 Warm-Up

2.4 Material

2.5 Markings

2.6 Range and Accuracy

2.6.1 Torque Requirements

2.6.2 Force Requirements

2.6.3 Tension Requirements

2.7 Digital Display

2.8 Connections

2.9 Size Requirement

3.0 Accessories

3.1 General

3.1.1 Various Adapters

3.1.2 Torque Multipliers

3.1.3 Compression and Tension Force Gages

3.1.4 Cable Tensiometers

3.2 Mounting Accessories

1.0 Scope

1.1 General

This document specifies the minimum requirements for a Torque and Force Calibration Bench, herein referred to (for the Calibration Standards Specification, CSS) as the “Calibration Bench”. The Calibration Bench will be used to calibrate torque screwdrivers, torque wrenches, torque power tools, compression and tension gauges, cable tensiometers, torque multipliers, and any other torque equipment that may be found in the Naval inventory. The Calibration Bench shall be of a commercial design or a modified commercial design.

1.2 Usage

The requirements of this CSS are tailored to the intended use of the equipment. The Calibration Bench covered by this CSS is intended for calibration of testing equipment in controlled environments in which Naval test equipment is operated. The Calibration Bench will be used by civilian and uniformed Navy personnel in shore-based laboratories, land vehicles and sea vehicles.

2.0 Requirements

2.1 Electrical Power Source

The Calibration Bench shall operate at a nominal value between 110 and 120 VAC and 50 to 60 Hz.

2.2 Environmental Requirements

The temperature ranges and humidity limits for both the operating and non-operating conditions are as follows. The Calibration Bench shall be able to perform at its specified requirements at a temperature between 60 and 85 degrees Fahrenheit. The Calibration Bench shall be able to perform at its specified requirements when the relative humidity is 20 to 60 percent.

2.3 Warm-Up

The Calibration Bench shall comply with the specified performance requirements after a warm up time not exceeding 30 minutes and a warm up time between transducers not exceeding 15 minutes. This will allow for the range to be varied in an efficient manner.

2.4 Material

The Calibration Bench shall be made of materials that are durable and capable of withstanding corrosion due to the environment in which the benches will be; this includes, but is not limited to, temperature controlled laboratories and calibration laboratories on Naval vessels.

2.5 Markings

The transducers shall be permanently and clearly marked with their operating range as well as an easy way to identify them (ex. Marked 1-5). The Calibration Bench itself, at a minimum, shall be permanently and clearly marked with the manufacture name, manufacture model number and serial number in a spot that is easily accessible when the Calibration Bench is against a wall.

2.6 Range and Accuracy

2.6.1 Torque Requirements

The Calibration Bench shall have the required equipment and transducers to cover the entire range of 4 in-oz to 6,500 ft-lbs of torque with an accuracy of at least ± 0.5% indicated value (IV). The Calibration Bench shall also be able to calibrate both clockwise and counter-clockwise torque.

2.6.2 Force Requirements

The Calibration Bench shall have the required equipment to cover the entire range of 2.5 to 500 lbf with an accuracy of at least 0.125% IV.

2.6.3 Tension Requirements

The Calibration Bench shall have the required equipment to cover the entire range of 5 to 2,400 lbf with an accuracy of at least 2% IV.

2.7 Digital Display

The digital display for the system should clearly display the value of the torque being applied. The system should have a tracking mode (where the number moves as the torque is applied) as well as a peak hold mode (where the peak torque applied is held on the display when the applied torque is removed). The display should also be able to show several units of measurement including, but not limited to ft-lb, in-lb, in-oz, Nm, mkg and lbf. The digital display should also allow a technician to change between the different transducers with less than 3 user inputs to change between the different transducers in order to receive the correct reading. The display should at a minimum show the following resolution.

ft-lb in-lb oz-in Nm mkg lbf up to 20 in-lb 0.01 0.01 0.1 0.001 0.001 0.01 up to 240 in-lb 0.01 0.1 0.1 0.01 0.01 0.01 up to 200 ft-lb 0.1 0.1 1 0.1 0.01 0.01 up to 500 ft-lb 0.1 1 ---- 0.1 0.01 0.01 up to 6,500 ft-lb 1 1 ---- 1 0.1 0.1

2.8 Connections

Provisions shall be made to ensure that the transducers are easily connected to the Calibration Bench both for storage purposes and when in use. The connections from each transducer to the Calibration Bench shall be clearly marked if multiple cables are used. The transducers shall be easily removable along with the display system (if needed) in order to send the transducers and display system to another location for periodic calibration.

2.9 Size Requirement

The Calibration Bench shall be capable of assembly and disassembly for the purpose of transport and delivery in and out of laboratories on US Naval vessels. It must fit through doors and hatches in segments that can be safely carried.

The Calibration Bench shall be constrained to the following dimensions: 60”L x 30”D x 72”H.

3.0 Accessories

3.1 General

The Calibration Bench shall, at a minimum, be equipped with all accessories and adapters necessary in order to calibrate various sizes of torque screwdrivers, torque wrenches, torque limiters, torque drivers, torque watches, torque multipliers, force gauges, and cable tensiometers as listed in this section.

3.1.1 Various Adapters

The Calibration Bench shall be equipped with adapters in order to allow all necessary torque tools to be calibrated. Adapters will be required to interface between the Calibration Bench and the various torque test instruments. The required adapters are as follows:

• Adapter to allow capability to calibrate torque wrenches with up to a 5-foot handle

• A reaction post or similar adapter in order to hold the torque wrench handle stationary during calibration

• Square Hole Adapters in the following sizes: 3/8”, 1/2”, 3/4”, 1” and 1 1/2”

• Torque Watch Adapters to calibrate the following sizes:

o Waters Torque Watches 1 5/8” Hex (6-pt.)

2” Hex (6-pt.)

o Tonichi Torque Watches 2.45” (12-pt.)

2.64” (12-pt.)

o Snap-On TEX Torque Watches 1 1/8” (Irregular Square) 1 3/16” (Irregular Square)

• Square Drive Bar Adapters in the following sizes: 3/8”, 1/2”, 3/4”, 1”, 1 1/2”

• Hex Drive Bar Adapters in the following sizes: 1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, 3/4”, 13/16”, 7/8”, 15/16”, 1”, 1 1/16”, 1 1/8”

• Square Bushing Adapters in the following sizes: 1/4”, 3/8”, 1/2”, 3/4”, 1”

3.1.2 Torque Multipliers

The Calibration Bench shall have an extension (either permanent or movable) apparatus that will allow for the calibration of Torque Multipliers ranging from 0 to 6,500 ft-lbs. The calibration apparatus will also require a 1 1/2” x 12” square drive bar, a #43 spline to a 1 1/2” square adapter, a drive bar stop plate and a multi-pattern adapter to fit a variety of torque multiplier sizes, if the calibration bench does not allow them to be mounted without adaptation.

3.1.3 Compression and Tension Force Gages

The Calibration Bench shall have a test system kit in order to test compression and tension gages across the range.

3.1.4 Cable Tensiometers

The Calibration Bench shall have a test system kit in order to test cable tensiometers across the range.

3.2 Mounting Accessories

The Calibration Bench shall come with either a bracket or some type of system to mount the Calibration Bench to the floor of a Naval Vessel. The attachment system should be resilient enough to keep the Calibration Bench in place while the vessel is in motion, which includes, but is not limited to rough waters, high speed maneuvers and sharp turns of the vessel.