9.1 BASIC MATH - BASIC MILL OPERATOR

An important conversion in a machine shop is millimeters to inches. How many millimeters are in one inch?

25.4

There are two types of scales that are common when dealing with "inches" in a machine shop. The two types are:

A fractional scale and a decimal scale

A steel ruler, or steel rule, found in a machine shop is also referred to as a:

A scale

It is not important to be able to convert fractions to decimals in the machine shop environment.

False

When the Metric System is in use in the machine shop, the size of the part is usually shown in:

Millimeters (mm)

It is helpful to have a Fraction-Decimal Conversion Chart in the shop, as a guide.

True

It is important to be able to estimate how long a job will run, based on the total number of parts needed and how many you can run per hour or day.

True

While the tape measure and the scale most often display fractional measurements, the machine shop world works primarily in decimals.

True

This video outlined the minimum math skills you will need to work in a machine shop. For additional math skills, we suggest that you:

Use a simple Google or YouTube search to find the necessary additional help

In the thread callout 1/4-20, what does the 20 stand for?

There are 20 threads per inch

In the video, there was a need for a 3/8" drill. What is the decimal equivalent for 3/8"?

.375

It is important to be able to read a tape measure when you are asked to find the correct raw material from the raw material inventory. To read the tape measure, it is important to understand the divisions on the tape. Typically, the smallest division on a tape measure is:

1/16"