Dimensional Consulting

  • Home
  • About
  • Contact
  • Free Online Textbook
  • Training Classes
    • Fundamentals Class
    • Tolerance Stacks Class
    • Applying Statistics Class
    • Functional Gaging Class
  • Tolerance Stacks
  • GD&T Store
    • The Stacks Wizard
    • Fundamentals of GD&T Textbook
    • Tolerance Stacks Textbook
    • Applying Statistics Textbook
    • Functional Gaging Textbook
Cylindricity
Back to Table of Contents
We discussed Harley's toy before when we wondered how straight it is. Now we take that a step farther and discuss how cylindrical it is.
Picture
The cylindricity specification is as shown below.

Picture
Cylindricity is always applied to a surface.   It never has a datum reference.  It never has any modifiers in the feature control frame except the Free State Modifier if applicable.

In our case below, the entire surface must fall between two concentric cylinders that are 0.1 apart. The 0.1 is a radial distance.

It says nothing about the size of the cylinders. It's just any two concentric cylinders that are radially 0.1 apart.

Cylindricity applies over the entire part at the same time.

Picture
Cylindricity must always apply to a cylinder - nothing else.

As with all form tolerances, rule #1 applies a cylindricity tolerance whose value is equal to the size tolerance.  Therefore any cylindricity tolerance that is applied must have a value that is smaller than the size tolerance.

Powered by Create your own unique website with customizable templates.