Dimensioning Guidelines for Drawing Creation

Guidelines

Drawing Levels

Standard
Compliant
Drawing

Mixed
Method
Design

Functional Design with Analysis

Drawing indicates all the dimensioning and tolerancing standards that apply

X

X

X

The drawing fully defines each surface of the part (for size, location, orientation or form)

X

X

X

No coordinate tolerances are used to locate holes, tabs, or slots

X

X

X

Position tolerances are used to locate all holes (also slots and tabs)

X

X

X

Profile tolerances are used to locate part surfaces

X

X

X

Orientation tolerances are used to orient all angular relationships

X

X

X

Datum(s) are specified       

X

X

X

All geometric tolerances are specified in accordance with Y14.5

X

X

X

All general notes, title block tolerances, and notes show clear definition and do not conflict with other tolerances

X

X

X

General tolerances are specified for non-functional (or non-critical) part features with geometric tolerances that are mathematically robust

X

X

X

All part features assemble at nominal

X

X

The dimensioning is based on a combination of functional dimensioning, dimensioning for manufacturing, and/or inspection (organization must define the mix)

X

x

Tolerance stacks exist to ensure part assembly at worst case

P

X

Part tolerances are adjusted based on tolerance stacks for assembly

X

Dimensioning is based on the function of the part

P

X

Part mounting features should be used as datum features; additional datum features are specified to document functional relationships.

P

X

Part functions are identified and prioritized

P

X

A functional analysis has been completed for each part

X

Where a part feature affects several product functions, the dimensioning represents at least one of them

X

All important functional part feature relationships are directly dimensioned using GD&T

X

Design has been adjusted to ensure that tolerance values are maximized and based on product function

X

The stacks that ensure product function have been completed

X

A tolerance stack exists for each tolerance (for a functional relationship) on the drawing

X

P = Begin to work on this guideline as much as practical             X = Use this guideline on new drawings