Unit One Vocab O-R

Question 1

Oblique Surface

Answer 1

A flat surface slanting in two directions. It will appear distorted in all principal views.

Question 2

Orthographic Projection

Answer 2

The process of projecting the essential views of a 3D object onto a flat plane, like a piece of paper.

Process is used for machinist blueprints.

Question 3

Pad

Answer 3

A raised projection on a casting used to provide extra metal around a series of holes or a slotted holes.

Question 4

Parallel

Answer 4

Extending in the same direction, such as two lines, everywhere equidistant and not meeting.

Question 5

Pattern

Answer 5

A model, made of wood metal, or other material, used to form a cavity in the sand for pouring castings.

Question 6

Perpendicular

Answer 6

Being at a right angle (90 degrees) to a given line or plane.

Question 7

Pickle

Answer 7

To remove stains or oxide scale from parts by immersion in acid solution.

Question 8

Pinion

Answer 8

The smaller of two mating gears.

Question 9

Pitch

Answer 9

The distance from a point on a thread to a corresponding point on the next adjacent thread measured parallel to the axis.

Question 10

Profile View

Answer 10

The view that most clearly illustrates the shape of a feature is considered the profile view of that feature. With a hole it would be the view showing that it is round.

Question 11

Quenching

Answer 11

Cooling metals rapidly by immersing them in water, oil, brine or air.

Question 12

Radius

Answer 12

The distance from the center of a circle or an arc to its circumference Equal to 1/2 a diameter.

The plural of radius is “Radii”

Question 13

Ream

Answer 13

A machine operation consisting of enlarging a hole slightly.

Question 14

Reciprocation

Answer 14

A straight-line, back and forth motion. To move in alternative directions.

Question 15

Reference Dimension

Answer 15

Used only for informational purposes. Does not receive the Standard point tolerance and should not be used for production or inspection.

Question 16

Regardless of Feature Size

Answer 16

The condition where tolerance of position or form must be met irrespective of where the features lies within its size tolerance.

Question 17

Relief

Answer 17

The amount one plane surface of a piece is set below another plane, usually for clearance.

Question 18

Rib

Answer 18

A relatively thin, flat member acting as a brace or support.

Question 19

Round

Answer 19

A convex surface (exterior radius) at the intersection of two surfaces of a casting or forging.