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THE PURPOSE OF PRINTS

The Language of Industry

A picture is worth a thousand words. Especially true for industrial products.

Calculations and ideas of the engineer must be transferred to the workers in the field.

Impractical for the engineer to be present during fabrication.

Something other than verbal communication is needed.

Impossible for the engineer to describe shape,size, and relationship with other parts sufficiently for a skilled worker to produce the object.

Have the students try to describe various objects.1. Corvette2. Weld3. Welding Machine4. How to do something

Drawings are the universal language used by engineers, draftsmen, designers, andskilled workers to accurately communicate necessary information to produce, assemble,or service an industrial product.

The original engineer’s drawing is seldom used in the field. Prints are made anddistributed.

What is a print?

A copy of the original drawing. (Print, Blueprint, Drawing, Sketch)

Prints provide details of size and shape description, tolerances, materials used, finishand other treatments (notes). Different views (normally front, side, and top).

Have a sample for students to look at.

Why prints are used:

Original drawings would often be destroyed.

Several sets needed at one time at different locations.

The original may be used and stored indefinitely.

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How prints are made: ACAD is taking over. Be familiar with it.

BlueprintsOldest techniqueSeldom used today

DiazoQuick, inexpensive, and versatileOriginal on semitransparent paper Exposure to light and ammonia vaporsBlack on white, color

Microfilm – Originally used to reduce storage

Xerography

Dry materialsElectrostatic chargeZoom capabilitiesInexpensive

Computer Assisted Drafting – CADAccurate, quality, quick

Have samples for all types of prints

Print Reading:

There are three basic elements to be found on a print:LinesDimensionsNotes

Lines: show edges of objects, aid in dimensioning the object, and used information of symbols.

Dimensions: give sizes and locations.

Notes: give details of construction not shown by lines. (Found adjacent to a viewor in a rules space provided on the print for this purpose.

Have sample of lines, dimensions, notes, and views.

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Views:

Print reading is securing information from a print. This task involves two principalelements – visualization and interpretation of the print.

Visualization is the ability to see or envision the size and shape of the object from printsthat show various views.

Importance of reading prints:

Prints also provide the welder with all the technical information needed to prepare andcomplete the weld.

ProcessWeld SizeWeld TypeFiller Metal

FinishMany industrial products such as airplanes, ships, and automobiles are manufactured inseparate facilities.

The moment of truth during final assembly or field work (spare parts).

Care of prints:

Prints are valuable records of information.With proper care they can be used many times.

Good rules to observe when working with prints.1. Never write on a print unless you have been authorized to make plan changes. (red

line)2. Keep prints clean and free of oil and dirt.3. Fold and unfold prints very carefully to avoid tearing. (The print number should

show).564. Keep prints clear or the work place.

Have students practice folding prints.

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