Envelopments (Leaving Cert DCG): Flashcards

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Envelopments
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What is an envelopment in technical drawing?

Wrapping a flat pattern around an object to create a 3D shape

Envelopment vs development

Envelopment wraps flat patterns around objects; development unfolds 3D objects into flat patterns (opposites)

Complete envelopment definition

Wrapping entire development around a 3D object

Partial envelopment definition

Only part of object's surface is covered

Partial envelopments when laid flat

Appear much more complex than when wrapped around object

Circumference formula for cylinder with radius RR

2piR2pi R

Development length for cylindrical envelopment

Must equal the circumference of the cylinder

First step creating pentagonal prism envelopment

Start with orthographic views of the object

Purpose of fold lines in envelopment

Indicate where pattern bends to form 3D shape

Example of partial envelopment

Labels on bottles and jars

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