LINE CONVENTIONS
Shows size variances not given in the drawing.
What is the tolerance block?
The view that shows the most detail.
What is the front view?
The bottom between the two ridges.
What is the root?
The term used to show the origin from which the location of features is established, (reference plane)
What a datum?
It is the ratio of the part as drawn and the actual part.
What is the scale block?
What a viewer sees when looking at the object in a glass box. The object is unfolded so the top view is above the front view.
What is third angle projection?
The most important diameter of the thread.
What is the pitch diameter
A system for showing any changes on a drawing.
What is the revision history block?
Thread that tightens in the counter clockwise direction.
What is a left hand thread?
.Type of tolerance that permits variation from the dimensional value in both directions.
What is a bilateral tolerance?
This is used to specify an area of a large print, similar to what is used on a highway map.
What is zoning?
An inclined surface when looked at straight on not sideways looks smaller.
What is foreshortened?
The distance between one point on a screw thread to the same point on the next thread.
What is the pitch?
Thin line composed of long dashes with pairs of short dashes, primarily used to indicate alternate positions of moving parts, adjacent positions of related parts, or for repeated details.
What is a phantom line?
Mental picturing of 2D and 3D shapes and objects.
Spatial visualization?
The three classes for an external thread.
What is 1A, 2A, and 3A?
A general term used for a commercial product to designate size. An example is a 2x4.
What is nominal size?