Mr. Retherford's Lecture Notes
I. There are two types of portable drills, electric & battery powered.
a. The size of the drill is determined by the maximum chuck capacity. Ex. If the largest drill bit that will fit in a chuck is ½”, the drill is a 1/2” drill.
b. Electric Drills are stronger and therefore more dangerous.
II. Safety Rules
a. Disconnect the power plug before installing or removing drill bits
b. Be sure that the drill is in the off position when connecting to a power supply
c. When changing bits be sure that the bit is securely clamped in the chuck
d. Be sure that they key has been removed before using the drill
e. Do not force the drill, use steady, even pressure
f. Do not lay the drill down until it has coasted to a complete stop
g. Always clamp small pieces, do not try to hold them with your hand
h. Stock must be held so that it will not move during the operation.
i. During operation, always keep the drill aligned with the direction of the hole.
j. Never try to drill through cloth.
III. Demonstrate the process of changing bits for both types of drills
IV. Allow class to practice changing bits while in the classroom.
Worksheet
Student Name: __________________________________
Date___________________________________________
Objective: This lesson is designed to help you understand the safety principles involved with using a Portable Drill.
Directions: Please answer the questions on this sheet of paper. Doing this will help you identify the most important parts of the lecture and class discussion concerning the installation of fiber cement siding. The worksheet will be turned in, graded, and returned to you to help you study for your test. Point deductions will be made for spelling and grammar errors.
1. What determines the nominal size of the drill?
2. List the two types of drills.
3. What should you do before changing drill bits?
4. What position should the drill switch be in when connecting to a power supply?
5. When changing bits what should you check for?
6. Is it ok to use a drill with the chuck key in the chuck?
7. Is it ok to force the drill?
8. What should you check for before laying the drill down?
9. What should you do with small pieces when you have to drill them?
10. How should stock be held be held before drilling?
11. When drilling how should the drill be held?
12. Is it ok to drill through cloth?