Tolerancing and Testing - SMI MEMBER

This 43-page book discusses the principles and procedures for testing springs, and provides guidelines for tolerances. Includes both U.S. and Metric units.

Table of Contents:

Tolerances

* Introduction, warning

* Compression Spring Load Tolerances; Quality Grades

* Compression Spring Free Length Tolerances

* Extension Spring Load Tolerances; Quality Grades

* Extension Spring Free Length Tolerances

* Torsion Spring Load Tolerances (Torque); Quality Grades

* Tolerances for Hot-Coiled Springs

* Tolerances for Retaining Rings; Diameter Tolerances

* Tolerances for Belleville Washers

* Tolerances for Special Spring Washers

* Tolerances for Flat Springs

~ Guidelines for Spring Testing

Helical Compression Springs

* Purpose

* Scope

* General

* Workmanship: Surface, Burr, Ground Ends, Closed Ends

* Dimensions: Wire Diameter, Spring Diameter, Number of Coils, Squareness, Parallelism, Bow, Free Length

* Performance Characteristics: Load/Rate Testing, Fixtures, Buckling

* Procedure for Load Testing: Stress Relaxation, Fatigue Life

Helical Extension Springs

* Purpose

* Scope

* General

* Workmanship: Burr, Surface, Tool Marks

* Dimensions: Special Terminology, Wire Diameter, Outside Diameter, Free Length, Number of Coils, Hook/Loops, End Relation, Pitch

* Performance Characteristics: Load/Rate, Initial Tension, Stress Relaxation, Fatigue Life

Helical Torsion Springs

* Purpose

* Scope

* General

* Workmanship: Burr, Surface, Shot Peening, Ends

* Dimensions: Wire Diameter, Spring Diameter, Number of Coils, Direction of Winding, End Relation, Length, Other Dimensions

* Performance Characteristics: Load/Moment/Rate Testing, Fixtures, Procedure for Load/Moment Testing

* Stress Relaxation

* Fatigue Life

For bulk discounted pricing, please contact Gaby at gaby@smihq.org.