Unit One Vocab S

Question 1

Scale

Answer 1

Refers to the relative size of the drawing and the size of the part. The first number represents the size of the drawing and the second number of the size of the part.

Dimensions always represent the size of the part, not the print.

Question 2

Section

Answer 2

An interior view of an object, drawn to expose features not otherwise visible.

Question 3

Serrated

Answer 3

A surface or edge having notches or sharp teeth is said to be serrated.

Question 4

Shim

Answer 4

A thin piece of metal or other material placed between two parts to adjust the fit.

Question 5

Shoulder

Answer 5

A plane surface on a shaft, normal to the axis and formed by a difference in diameter.

Question 6

Spline

Answer 6

A raised area on a shaft (external) or hub (internal) parallel to the axis and designed to fit into a recessed area of a mating part.

Question 7

Spotface

Answer 7

To machine a round spot on a rough surface, usually around a hole, to give a good seat to a nut or bolt-head.

Abb. SF or SFACE

Question 8

Springs

Answer 8

Basically springs fall into two categories: Helical or Flat.

Most common helical springs:
Compression
Extension
Torsio

Question 9

Compression

Answer 9

Tends to supply force when compressed, either in a hole or around a hole.

Question 10

Extension

Answer 10

Tends to supply force when its extended (pulled from end to end) contains hooks on each end for connections.

Question 11

Torsion

Answer 11

Designed to resist twisting or rotary motion. Contains hooks or projections for connections.

Question 12

Stud

Answer 12

A round piece of metal threaded on both ends.

Question 13

Surface Roughness

Answer 13

Roughness refers to the finely spaced irregularities produced in fabricating a part. The height of the irregularities is rated in micrometers or micro inches.

Question 14

Symmetrical

Answer 14

The same on each side. Equal halves. A center line usually indicates symmetry.