ME180 Lecture 14 Geometric Tolerancing

Dimensions describe where the holes are to be frame

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: s describe where the holes are to be Frame contains tolerance for the holes Frame is actually "feature control frame" Used for holes, slots, tabs, surfaces, etc. Controls features & gives instructions 13 Feature Control Frame 1st compartment Geometric symbol 2nd compartment Zone symbol diameter, etc. Total tolerance Feature modifier 14 Feature Control Frame 15 GD&T Tolerance Zones 16 Datums Measurement origins used implied datums in past Edge of a part, etc. GD&T uses specified datums next compartments Need to know the order Measurements are basic no tolerance Tolerance in feature control frame with other requirements Placed under feature being located or controlled 17 18 Maximum Material Condition Concept Increases available tolerance Smallest hole or largest pin 19 Maximum Material Condition Concept 20 Maximum Material Condition Concept 21 22 Maximum Material Condition Concept Can give more tolerance while ensuring functional fit Was not available with plus/minus system MMC used most often (90%) Most parts are loose fitting Allows functional type gaging Used with location, form or orientation tolerances Modified features must have size 23 Least Material Condition Concept 24 Least Material Condition Concept 25 26 Least Material Condition Concept Used in unique situations such as: Controlling wall thickness Castings Gaging Tooling Least used method (5%) Used with location, form or orientation tolerances Modified features must have size (same as MMC) 27 Regardless of Feature Size Tolerance only as indicated in feature control frame No additional tolerance as in MMC...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern