EP_dimensions

Drawings Components

and Properties

Multiple Choice

Sketch entities that are under-defined are displayed in which color?

• Blue

• Grey

• Black

• Red

Multiple Select

[Multi-select] Select ALL answers that are correct.

What can the Dimension Tool be used for?

• Define angles between lines

• Define distance between points/lines

• Define length of lines

• Define diameter of circles

• Define radius of arcs

Multiple Choice

Which icon is the Sketch Fillet Tool, used to add fillets (rounded corners) on a sketch corner.

There are many different components and
properties that make a well-formed and
complete CAD drawing. These include:

● Units and precision ● Dimensions ● Annotations

● Views ● Construction geometry ● Formats

● Tables ● Inspection

​

​Drawings Components and Properties

In Onshape, settings that allow a user to customize all of these elements can be found by clicking on the wrench icon on the right-hand side of an Onshape CAD drawing.

​

​Drawings Components and Properties

Multiple Choice

What icon to you click on to customize the elements such as units and precision, dimensions, annotations, views, construction geometry and more?

• the tape measure

• the wrench

• the magnifying glass

• the green check

Units and Precision

Different types of drawings may require different units, depending on the application.

Unit

Example

Inches

12.875

Inches Fractional

12 7/8

Millimeters

327.025

Feet and Inches

1'-0 7/8"

Units and Precision

Two decimal precision is
sufficient in many engineering applications.

Mismatched units

Source:https://commons.wikimedia.org/wiki/File:Mars_Climate_Orbiter_-_launch.jpg

Source: https://www.simscale.com/blog/nasa-mars-climate-orbiter-metric/

Agreeing on and setting your units correctly can be the difference between success and failure.

In September of 1999, after almost 10 months of travel, the Mars Climate Orbiter arrived at Mars. On entry into the Martian atmosphere, it burned and broke into pieces.

Upon investigation, NASA discovered
that the failure was due to mismatched units. The navigation system used metric

units, but the commands from Earth were sent in English units.

Multiple Choice

What precision is typically good enough for most engineering application?

• 8 decimal places

• 6 decimal places

• 1 decimal place

• 2 decimal places

Multiple Choice

What is an assembly in Onshape?

• A collection of instances of parts, sketches, surfaces, or subassemblies that define both position and movement.

• A feature used to position instances in an assembly and define movement.

• A flat, two-dimensional surface that extends infinitely far.

• The cube in the top right corner of the graphics area when you open a document.

Multiple Choice

 A flat, two-dimensional surface that extends infinitely far.

• View Cube

• Plane

• Normal

• Mate

are used in sketches to control sizes and in plan drawings to communicate to others

​

​Dimensions

Dimensions in Plan Drawings

Dimensions are used in CAD Drawings to specify model details, where features are, how big they are, and how they relate to other model features.

There are many different types of dimensions. Drawing standards dictate when and how each should be used, but a CAD engineer has some freedom to edit some aspects of the style and
appearance of dimensions on the drawing.

Dimensions in Plan Drawings

Rules of thumb:
● Include enough dimensions to fully define the part. Over-dimensioning a part can make the drawing confusing.

● Dimensions should be based on the function of the part. They should be clear, and convey the design intent.

Multiple Select

[Multi-select] Select ALL answers that are correct.

Which of the following can be used to draw rectangular shapes?

Multiple Choice

Which icon is the Mirror Tool, used to draw a copy of selected entities about a line

Match

Match the following

• The cube in the top right corner of the graphics area when you open a document.

• A collection of design data organized into Onshape tabs.

• A collection of instances of parts, sketches, surfaces, or subassemblies that define both position and movement.

View Cube

Onshape Document

Assembly

• View Cube

• Onshape Document

• Assembly

Multiple Choice

Which end type of an Extrude is used to add an equal amount of material to both sides of the sketch plane?

• Symmetric

• Through All

• Blind

• Up To Face

notes added to the drawing that clarify or provide specific information relevant to the part. These can include information on holes, weldments, etc. Always use official annotations, such as “THRU,”defined in the ANSI standards.

​

​Annotations

​ More Annotations

​Even More Annotations

​Use the Annotations dialog box in Onshape to set the annotation preferences.

Multiple Choice

The American National Standards Institute (ANSI) developed and now maintains what? 

• A universal language of symbols for all who draw to use so everyone can understand floorplans
• the standards that must be followed by people who draw plans
• Both are correct

Multiple Choice

A uniform code or description of lines used in design drawings. It was developed by the American National Standards Institute.

• Alphabet of standards

• Alphabet of lines

• Alphabet of symbols

Multiple Choice

ANSI stands for

• Another Nautical Society Institute

• Automotive National Security Information

• American Nations Society International

• American National Standards Institute

Multiple Choice

Projection method used in the US

• 1st angle

• 2nd angle

• 3rd angle

• 4th angle

Formats

Drawing revisions

Notes to specify
standards,
materials,etc.

Tolerance block

Title block

Drawing border,
used to allow easy
reference to some
part of the drawing

Space for drawing
views and
dimensions

All together,
the drawing
elements
shown at left
are referred to
as the drawing
“frame” or
“format”

Format properties
can be changed in
the formats dialog

box

Formats

Standard format sizes

When creating a drawing, the user can
choose the size and format type from
standard Onshape formats or create
their own.

Standard format sizes

Important note: Throughout these units, we will often use A-size and B-sized sheets for ease of viewing. But C-size and above are more common, and often preferred, for anything other than extremely simple parts.

Multiple Choice

Which standard size is the largest?

• English D

  Metric A1

• English C

  Metric A2

• English B

  Metric A3

• A0English D

  Metric A1

Multiple Choice

Which icon is the Trim Tool, used to trim/remove a selected line or curve?

Multiple Choice

What is the purpose of the extrude feature in Onshape?

• To create a 3D solid by extending a 2D sketch in a specific direction.

• To create a 2D sketch by extending a 3D solid in a specific direction.

• To rotate a 3D solid around a specific axis.

• To mirror a 2D sketch across a specific plane.

Multiple Choice

Sketch entities that are fully-defined are displayed in which color?

• Blue

• Grey

• Black

• Red

Poll

Which Amazon review most closely describes how you feel about Onshape?

• I had a two wolf shirt for awhile and I didn't think life could get any better. I was wrong. Life got 50% better, no lie.

• Haribo sugar free gummy bears: Words can not express what happened to me after eating these. The gummi bear cleanse.

• Meh.

• Horse head mask: Why don't you have one? I get asked this question and then gallop away happily and eat some grass.