# CTE Resource Center - Verso - Precision Machining Technology I Task 326125415

# Describe the formulas for determining speeds and feeds.

## Definition

Description should include
• the formulas and their variables
• where to locate the speeds and feeds charts containing standard information.

## Process/Skill Questions

• How is the spindle RPM determined for a lathe with a 2-inch diameter aluminum shaft?
• What are the inches per minute for a half-inch diameter end mill (two fluted) when cutting aluminum?
• What is the maximum spindle speed for a 6-inch diameter, half-inch wide, 80-grit grinding wheel? How might this information be located?

## Science

### PH.2

The student will investigate and understand how to analyze and interpret data. Key concepts include
1. a description of a physical problem is translated into a mathematical statement in order to find a solution;
2. relationships between physical quantities are determined using the shape of a curve passing through experimentally obtained data;
3. the slope of a linear relationship is calculated and includes appropriate units;
4. interpolated, extrapolated, and analyzed trends are used to make predictions; and
5. situations with vector quantities are analyzed utilizing trigonometric or graphical methods.

### PH.4

The student will investigate and understand how applications of physics affect the world. Key concepts include
1. examples from the real world; and
2. exploration of the roles and contributions of science and technology.