CAD Flashcards
What does the extrude tool do and how do you use it
Can be used to add and subtract material. To use it, finish sketch and select the area you want to extrude. Enter the height and direction
What is the revolve tool and how do you use it
An axis and profile is needed. Select the profile and then the axis and choose whether you want a full 360* or a partial revolve. These can have offset/removed axis (when the axis of rotation is not touching the profile) or attached axis (when the axis is touching the profile)
What is the helice command and how do you use it
Creates springs or coils or customised thread’s . The four specifications include; profile, axis of revelation, radius and the pitch. The pitch is the distance the helice will move up or down with every full rotation. A taper cab be added + will give a widening affect, - will give a narrowing affect.
What is the loft tool and how is it used
Turns one shape gradually into another e.g. Circle-hexagon. This is used by having two different profiles sketched on two work planes offset from each other. Select the first profile and then the second whilst on the loft tool.
What is a CAD library and what benifit comes with it
Gives access to many standard components (nuts and bolts) which saves time and reduces chance of error as it eradicates the need to make the same part several times
What are the free types of 3D views
Think S.W.S: Solid, Wire frame, shaded
What is radial array
(circular array) requires the number of repeated shapes and the angle/axis to follow
What is rectangular array
(box array) requires the pitch, number of rows, number of times the shape is repeated.
What is the shell command
Used to hollow solid objects, giving a. Uniform wall thickness throughout
Top down modeling
Ensures components fit together in final assembly by using one part to help make another. Very efficient, fast and reduces chance of error.
Top down modeling (projected modelling)
Copying or mirroring 3D parts. If symmetrical then one half of the model is created. This is them mirrored and the original is deleted. After this the two parts are assembles as normal.
Top down modeling (projected geometry)
Model is created for the projected geometry. Do this for all areas of the model. Delete the original part (source of projection) and save the new part separately. Assemble these two components and any other parts required.
Bottom up modeling
Think bottom is bad. Each part is made separately so errors are not noticeable until final assembly. Absalout accuracy is required. If there is errors in the preliminary sketches then this will lead to errors in the model. This high risk method can be time consuming and inefficient
