Runout Controls

Hillsborough Community College, Brandon Campus

Alessandro Anzalone, Ph.D.

Runout ControlsSections:1. Introduction2. Circular Runout3. Total Runout4. Comparison Between Circular and Total Runout5. Runout Calculations6. Summary7. References

IntroductionRunout is a composite control. A composite control controls the form, location, and orientation of a part feature simultaneously (in a single gage reading). Runout controls are often used to control the coaxiality of diameters. A runout control always requires a datum axis. There are two types of runout controls: circular runout and total runout.A runout control can be applied to any part feature that surrounds, or is intersected by, the datum axis. A runout tolerance value specified in a feature control frame indicates the maximum permissible indicator reading (gage travel) of the considered feature, when the part is rotated 360° about its datum axis.

Circular RunoutCircular runout is a composite control that affects the form, orientation, and location of circular elements (individually) of a part feature relative to a datum axis. A circular runout control is a geometric tolerance that limits the amount of circular runout of a part surface. Circular runout applies independently to each circular element of a diameter. It is referred to as a composite control because it controls the form, location, and orientation of a part feature simultaneously (in a single gage reading). Circular runout is frequently used to control the location of circular elements of a diameter. When applied to a diameter, it controls the form (circularity) and location of the diameter to a datum axis.

Circular Runout

Circular Runout

Circular Runout

Circular Runout

Circular Runout

Circular Runout

Circular Runout

Circular Runout

Total RunoutTotal runout is a composite control affecting the form, orientation, and location of all surface elements (simultaneously) of a diameter (or surface) relative to a datum axis. A total runout control is a geometric tolerance that limits the amount of total runout of a surface. It applies to the entire length of a diameter simultaneously. It is referred to as a composite control because it affects the form, orientation, and location of a part feature simultaneously. Total runout is frequently used to control the location of a diameter. When applied to a diameter, it controls the form (cylindricity), orientation, and location of the diameter relative to a datum axis.

Total Runout

Total Runout

Total Runout

Total Runout

Total Runout

Total Runout

Comparison Between Circular and Total Runout

Comparison Between Circular and Total Runout

Runout Calculations

Summary

Referenceshttp://www.dimcax.com/gdt_web/march-98.htmhttp://www.emachineshop.com/machine-shop/Runout/page607.htmlhttp://www.toolingu.com/definition-350200-36199-total-runout.htmlhttp://www.tec-ease.com/tips/june-97.htm