GD&T Tips

Datum Feature Control

Primary Datum Surface Control - 1994, 2009 & 2018

Tie your datum features together - 1994

Keep It Simple

Example

With General Tolerance

Tie your datum features together - 2009 & 2018

Datum Feature Selection

Function Example

Slot as Primary

Application - Video!

Two Holes

Horizontal - Video!

On a Diagonal - Video!

Datum Feature Types

Primary

Linear Extrusion - Video!

Complex - Video!

Hole and Slot - Video!

Hole and Slot Simulation - Video!

Secondary

Watch the Placement of Datum Identification Symbols... 1994 & 2018

Watch the Placement of Datum Identification Symbols... 2009

Datum Features

Must Be Referenced - Video!

Axis vs. Center Line - Video!

Datum Not on Part - Video!

Datum Reference Frame

Oblique Angle

Establishing

Displacement (Shift)

Tolerances Do Not Change

Rotational Shift - Video!

Geometry Effect - Video!

Example - Video!

Application - Video!

Datum features can give you a shift-not a bonus - 1994

Datum features can give you a shift-not a bonus - 2009, 2018

Exact Constraint

Over Constraint

Rocking Datum Feature - Video!

Orienting Datum Planes

Tertiary Datum Feature

Using a Slot - Video!

Sufficient Size

Thin Feature

Short Hole - Video!

Symbol Placement

Watch placement of datum triangles in the latest Standard - 1994, 2009, 2018

Watch where you put that triangle!

Basic and +/- Don’t Mix - Video!

+/- vs. Profile Example - Video!

Dimensioning vs. Tolerancing - Video!

Multiple In-Line Features - Video!

Implied - Video!

Slots - Video!

Reduced Dimension Drawings

Rounding

Converting

Schedule of Tolerances

Basic

Do Not Tolerance

Toleranced Dimensions

Don’t Mix Dimensioning

General Notes

Trailing Zeros

Half Dimensions - Video!

Angles

Consider the Reader

Compound Angle - Video!

Placement

Get Back to Datums

And Composite - Video!

Basic Dimension Placement Doesn’t Matter - Video!

Give Production the Dimensions They Need - 1994, 2009, 2018

Direct Tolerancing

Time to Stop the Nonsense - 1994, 2009 & 2018

Don’t Located With +/- - Video!

Tolerance Zone Shape - Video!

Continuous Feature - Video!

Interrupted - Video!

Determining - Video!

Locating Dimensions to Centers

Irregular Features of Size - Video!

Envelopes

Determining Size and Center - Video!

Irregular Features of Size

Locate with Profile

Locate with Position

Inspecting at MMC - Video!

Center Plane Control - Video!

Unit Base

Never a Datum Reference

Drawing Previews - Video!

Selecting Controls - Video!

Pyramid

Profile

Features of Size

Simulating a Hard Gage

CMM Simulating Gage

Uncertainty

Measurement versus Verification - Video!

Notes

An Individual Tolerance - Video!

Never Locate

Say What You Mean - Video!

When to Use It - Video!

Stabilizing the Zone - Video!

Extension of Principle - Video!

Threads at MMC

Formulas

Oblique Features

Locating Features of Size

Calculating Bonus - 1994

Bi-directional Control

Boundary Control

MMC and LMC Are Single Limits

Calculating Bonus - 2009 and 2018

Think Boundary, not Bonus - 1994, 2009, 2018

Composite

Datum Feature References

Second Segment

Using a Note - Video!

Several Examples - Video!

Feature to Feature Control - Video!

Composite l - Video!

Composite ll - Video!

Composite lll - Video!

Composite l Gage - Video!

Composite ll Gage - Video!

Composite lll Gage - Video!

Single Segment

Example l

Composite Vs Single Segment - 1994, 2009, 2018

Cpk Calculation

Coaxial Example

From CMM Data

Placement - Video!

At MMC - Video!

Calculating Size Tolerance

Tolerance on Two Surfaces

Of a Line

Controlling Size Part l

Controlling Size Part ll

Unequal and Unilateral

The most important control in GD&T is location, location, location - 1994, 2009, 2018

Protect your boundaries with Profile - 1994, 2009, 2018

Controlling Size and Form

Unit Basis - Video!

Between - Video!

Use Profile to Control Size and Form - Video!

Applications

Cutter Ring

Irregular Feature

As a General Tolerance

Simplify Your GD&T - 1994 & 2009

Profile can Control Location of Irregular Features - Video!

Simplify Your GD&T - 2018

Composite

On a Single Surface

Position can Control Location of Irregular Features - Video!

Coplanarity

For Coplanarity use Profile - 1994

And Parallelism

For Coplanarity Use Profile - 2009 & 2018

Inspection

Simplified Inspection

Reporting ll - Video!

Remember, inspection is work versus risk!

What Are The Rules? 1994, 2009 & 2018

Defaults - Video!

Rule #1

Inspection - 1994, 2009, 2018

Size Controlling Form - 1994, 2009, 2018

Is Not an Option

Break the Rule - Video!

Simultaneous Requirements

Overriding the Rule

Creating a Pattern

Simplifying the Dimensions - Video!

Application - Video!

Keep Your Runouts Straight

Circular vs. Total

When in Doubt - Use Runout - 1994 and 2009

Don’t give runout more credit than it deserves - 1994, 2009, 2018

When in Doubt, use Runout! - 2018

Molded Part Symbols - Video!

Default Tolerances - Video!

Difference in Revisions - Video!

Y14.41 - Video!

Other Standards - Video!

2009 Symbols - Video!

Are Voluntary - Video!

Addendum - Video!

2009 Revision - Video!

Matter of Life or Death - Video!

Get Up to Speed with the ASME Y14.5-2018 Edition - 2018

Consider straightness on your parts made from flat stock - 1994

Consider Runout

Two Kinds of Straightness Tolerance - 1994

Center Plane at MMC - Indicator Inspection

Two Kinds of Straightness Tolerance - 2009 and 2018

Consider flatness at MMC on your parts made from flat stock - 2009 & 2018

Use Position - 1994

Use Position - 2009

Use Position - 2018

Projected Tolerance - 1994 and 2009

Projected Tolerance - 2018

Free State

Restraint with Datum Targets - Video!

Use the Free State Symbol for your Flexible Parts - 1994, 2009, 2018

Tangent Plane

Application

No Form Control

GD&T and Engineering Resources

GD&T Tips and Symbols

Online GD&T Quiz

Most Recent GD&T Tips:

Remember, inspection is work versus risk!

Watch where you put that triangle!

Consider straightness on your parts made from flat stock - 1994

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GD&T and Engineering Resources

GD&T Tips and Symbols

Online GD&T Quiz

GD&T Tips

Most Recent GD&T Tips:

Remember, inspection is work versus risk!

Watch where you put that triangle!

Consider straightness on your parts made from flat stock - 1994

Select the Tip category below to view Tips. Tips in Red are available on-line for free. Tips with a video has "Video" next to the title. For access to all Tips, including PDFs, become a member of our Premium site. Only $19.95/year Tips only or $49.95/year for full access. Join Today!

Register to Receive Updated GD&T Tips in Your Email Box

Select the Tip category below to view Tips. Tips in Red are available on-line for free. Tips with a video has "Video" next to the title.

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