Engineering Drawings MeEn 476 Department of Mechanical Engineering Brigham Young University

Engineering Drawings

MeEn 476

Department of Mechanical Engineering

Brigham Young University

This week in class

• January peer reviews due Friday

• Career Fair Prep Wednesday

• Career Fair Thursday

• Monday’s class will be Integrity in Engineering and Technology

• Robust Design will move to Feb. 13

Today’s objectives

• How to make a great drawing• Anatomy of a component drawing• Anatomy of an assembly drawing

• Guidelines for checking drawings

• Assignment 2 is to check a drawing package.

How to make a great drawing

Put yourself in the shoes of the outsider who will make your parts…

• Can I make this part from the drawing I made?• Can my drawing be misinterpreted by

someone else?• Has the required Geometry, Material, and

Processing been addressed?• Does my work look good and professional?

How to make a great drawing

Know what to include in the drawings• Can I make this part from the drawing I made?• Can my drawing be misinterpreted by someone else?• Has the required Geometry, Material, and Processing

been addressed?• Does my work look good and professional?

Know the anatomy of a drawing…

Palm Treo Dock

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Anatomy of a Component Drawing

Ask yourself…

• What level of detail is included in the drawings?

• Is this level of detail important? And Why?

• Do the drawings have more or less information than the solid model?

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Standard Views of Orthogonal Projections


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Auxiliary Views


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Dimensions with Tolerances


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Cross Section Views


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Detail Views


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Manufacturing Details


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Notes on Material, Processing, and other important information

Level of Detail in Notes

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Detail in Reference Documents

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Title Block

The Title Block

Tolerances and Drawing Items

Approvals

Document Information

Bill of Materials / Parts List


Revision Block


Statement of Confidentiality

Comments and Questions?

Assembly Drawings

BOM and Assembly Intent

Not all information contained in Solid Model

Quality and Manufacturing Notes

Reflection…

Ask yourself…

• What level of detail is included in the drawings?

• Is this level of detail important? And Why?

• Do the drawings have more or less information than the solid model?

• Are these detailed drawings really needed?

Checking Drawings

• Format Check• Have we properly applied the recommended

format?• Equivalent to word processing spell checking

• Design Check• Have we executed the design intent properly?• Equivalent to proofreading and editing a

document

Format Check

• Title block -- is it completely filled out?

• Dimensioning -- are standard practices followed? Do we have tolerances and surface finishes specified?

• Notes -- are they complete

• Views -- do we have the proper number and kind?

Design Check

• Are the dimensions accurate? Do the dimensions make sense for the intended function?

• Are the surface finishes and tolerances appropriate for the part?• Let tolerances be loose where they can be

• Can the design be simplified?

• Can the drawing be misinterpreted?

Exercise

• How many improvements can you identify on each of the drawings in your handout?