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Planchard Copyright 2012 Planchard Copyright 2012

Planchard Copyright 2012 - PowerPoint Presentation

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Planchard Copyright 2012 - PPT Presentation

Drafting and Dimensioning Standards Instructors Name Course Number Planchard Copyright 2012 Drafting Standards In order for drawings to be dimensioned so people can understand them we need to follow various drafting dimensioning standards Below are a few ID: 574384

dimensions standards copyright drafting standards dimensions drafting copyright 2012 planchard ansi dimension dimensioning lines line holes location extension illustrated

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Slide1

Planchard Copyright 2012

Drafting and Dimensioning Standards

Instructors NameCourse NumberSlide2

Planchard Copyright 2012

Drafting Standards

In order for drawings to be dimensioned so people can understand them, we need to follow various drafting dimensioning standards. Below are a few:Slide3

Planchard Copyright 2012

Drafting Standards Institutions

ANSI - American National Standards Institute - This institute creates the engineering standards for North America

ISO

- International Organization for Standardization - This is a world wide organization that creates engineering standards with approximately 100 participating countries.Slide4

Planchard Copyright 2012

Drafting Standards Institutions

DIN - Deutsches Institut für Normung - The German Standards Institute created many standards used world wide such as the standards for camera film.

JIS

- Japanese Industrial Standard - Created after WWII for Japanese standards.Slide5

Planchard Copyright 2012

Drafting Standards Institutions

BSI - British Standards Institute - The national standards organization for the UK and an influential member of the ISO.

GOST

- Gosudarstvennye Standarty State Standard - Standards cover over 20 industries including Petroleum, Chemical, Mining & Mineral Resources, Power & Electrical Equipment, and Oil & Gas products. This body of standards has been adopted by the Commonwealth of Independent States (CIS) and is administered by the Euro-Asian Council of Standardization, Metrology, and Certification (EASC). Slide6

Planchard Copyright 2012

Drafting Standards Institutions

GB - Guojia Biaozhun, Standards - A set of mandatory and recommended standards regulated by SAC (Standardization Administration of China). Each GB Standard has a GB Standard number followed by the year when it's issued. Slide7

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Dimensioning: is the process of defining the size,

form

and

location

of geometric features and components on an engineering drawing.

Two general types of dimensions are used in drawings:

Size dimensions

- size of holes and size of features.

Location dimensions

- location of holes. Slide8

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

A dimension in a drawing consist of the following items:

dimension arrow,

dimension line, dimension value, and extension line

. Slide9

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Arrowheads are used to

terminate dimension lines

. The point of the arrowheads

on the leader line

must make contact

with the Feature line. The standard

size ratio for all arrowheads on Mechanical Drawings is ~2.5:1 (Length to width).Slide10

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Insert a gap so people are

not confused between the Feature line and

the extension line (ANSI standard).

Extension Line - extended from the view to indicate the

edges referenced with the dimension line.

Dual Dimensions – Primary units – IPS; Secondary units (MMGS)

.Slide11

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Remember - a

location dimension

locates holes or other part features.

A

size dimension

provides a radius, diameter, length, width, thickness, etc. Slide12

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

A

leader dimension

is a leader line

used to point toward a diameter or radius.

A

linear dimension

is a dimension that is either horizontal or vertical to the dimensioning plane.Slide13

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

An

arc

is always dimensioned by its radius. ANSI

standards require a radius dimension to be preceded

by the letter (symbol) R as illustrated.

A

angular dimension

is used to specify the

amount of degrees between two lines. Slide14

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ANSI Drafting Standards - Dimensions

A point or a center of an arc or circle is generally measured from two finished surfaces. The method of location the center is preferred to making an angular

measurement. As illustrated, the center of the circle and arc may be found easily

be scribing the vertical and horizontal center lines from the machined surfaces.Slide15

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

If a number of holes are to be equally spaced on a circle, then the exact location

of the first hole is given by a location dimension. To locate the remaining holes,

the location dimension is followed by 1.) the diameter of the holes,

2.) the number of holes, and 3.) then the notation EQUALLY SPACED or “EQ SP” as illustrated. Slide16

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Holes are often dimensioned in relation to one another

and to a finished surface.

Dimensions are usually given, in such cases, in the view which the shape of the

holes, that is, square, round, or elongated. The preferred method of placing

these dimensions as illustrated. Slide17

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

There are basically two types of dimensioning systems use in creating parts and drawings

U.S.

(IPS)

Metric

(MMGS)

*

Dimensioning standards based on ASME Y14.5-2009.Slide18

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

The U.S. system uses the decimal inch value. When the decimal inch system is used, a zero is not used to the left of the decimal point for values less than one inch

, and trailing zeros are used as illustrated.

Leading zero

Trailing zeroSlide19

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

The Metric system is normally expressed in millimeters and is rounded

to the nearest whole number - No trailing zeros as illustrated

.

Leading zero

Trailing zeroSlide20

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Working drawing are usually drawn with all U.S. or all metric dimensions. Sometimes the object manufactured requires both U.S. and metric measuring system. Dual dimensioning may be necessary. The optional secondary units are normally displayed in brackets [ ].Slide21

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Hole dimensions are used to denote drilled hole information by a bent leader line as illustrated. Slide22

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Hole dimensions are used to denote drilled hole information by a bent leader line as illustrated. Slide23

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Placement of Linear Dimensions - Order of Preference. When there is not enough room on the drawing view between the extension lines to accommodate either the dimension value or the dimension lines - located the outside extension lines as illustrated.

Slide24

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Linear Dimensioning Ordinate dimensioning is also known as

Datum dimensioning

or

Baseline dimensioning

Used when the

location

of features must be controlled from a common reference point or plane.

Baseline dimensioning

ensures the tolerance in manufacturing does not add up

.Slide25

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Linear Dimensioning Dimensioning from feature to feature is known as Chain Dimensioning

. Chain Dimensioning is commonly used and easy to insert. Slide26

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Linear Dimensioning Chains of dimension should only be used if the function of the object won't be affected by the accumulation of the tolerances.

View the two examples!Slide27

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Dimensioning Check ListEach dimension should be written clearly with only one way to be interpreted.

A feature should be dimensioned only once.

Dimensions and extension lines should not cross.

Each feature should be dimensioned.

Dimension features or surfaces should be done to a logical reference point.Slide28

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Dimensioning Check ListDimension features on a view should clearly show its true shape.

Enough space should be provided to avoid crowding and misinterpretation.

Extension lines and object lines should not overlap.

Dimensions should be placed outside the part.

Center lines or marks should be used on all circles and holes.

Slide29

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Dimensioning Check ListExtension lines do not cross unless situation is unavoidable.

Stagger dimension text.

Largest dimension placed farthest from profile.

Dimensions should be evenly spaced and grouped. Slide30

Planchard Copyright 2012

ANSI Drafting Standards - Dimensions

Dimensioning Check ListArrow heads do not overlap.Break extension lines that cross close to arrowhead.

Flip arrows to the inside if needed for room.

Move dimensions to the view that displays the outline of the feature.

Insure that all dimensions are accounted for. DO NOT OVER OR UNDER DIMENSION