Lesson 3: Clamps and Screwdrivers
WORD LIST
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1. parallel |
Going in the same direction and at the same distance from each other, as with two parallel lines. Example: the jaws in the parallel clamp are parallel to each other. |
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2. clamp |
a part with jaws for holding two things together. Example: a clamp has jaws that can be tightened. |
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3. fastener |
any small metal object that holds two pieces together. Example: some common fasteners are nails, screws, nuts and bolts. |
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4. tighten |
to fasten something strongly, to make the hold stronger. Example: Pedro, use the screwdriver to tighten that screw. |
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5. loosen |
to make less tight, to unfasten. Example: to remove the screw you must first loosen it. |
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6. screw
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a metal fastener with threads in the sides and a slot in the head. Example: a standard screw has a straight slot in its head. 7. slot = a narrow opening cut into the head (top) of the screw. Example: the slot in a standard screw is like a minus sign (-); the slot in a Phillips screw is like a plus sign (+). |
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8. narrow |
not wide; having little space to work in. Example: he could not put the screwdriver into the slot, because the space was too narrow. |
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9. offset |
the end of the screwdriver is bent at an angle. Example: this offset screwdriver permits me to tighten a screw in a narrow place. |
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10. bent |
not straight; turned at an angle. Example: the standard screwdriver has a straight blade; the offset screwdriver has a bent blade. |
Vocabulary practice
The Purpose of These Tools
The parallel clamp and the C-clamp are both used for holding workpieces, like the vise that we saw in the last lesson. The parallel clamp is used by machinists to hold small parts. The C-clamp is used to hold parts together and to hold a workpiece on a large machine.
Screwdrivers are used to tighten and loosen screws. Screws are kind of fasteners. A fastener holds two or more parts together. In the picture, there are two kinds of screws – the standard screw and the Phillips screw. Each screw has threads cut into its sides and a slot cut into its head. The end of each screwdriver is made to fit the slot. The standard screwdriver fits into the standard screw and the Phillips screwdriver fits into the Phillips screw. The slot of the Phillips screw is shaped like a star.
Another way to remember the different slots of the two screws: The Phillips is shaped like a plus sign (+) and the standard is shaped like a minus sign (-).
The offset screwdriver has one or two ends that are bent. The ends are bent so that the screwdriver can fit into narrow places where a straight screwdriver will not fit.
It is important to learn the names of these tools, so that you will understand the directions the instructor gives you. In the next few practice sheets let’s learn the names and purposes of these tools.
CLAMPS AND SCREWDRIVERS vocabulary practice 1
CLAMPS AND SCREWDRIVERS vocabulary practice 2
CLAMPS AND SCREWDRIVERS vocabulary practice 3
CLAMPS AND SCREWDRIVERS vocabulary practice 4
“What Tool Should I Use?”
Follow these directions:
(1) Listen to the following conversations
(2) continue to listen to the tape and say the parts after you hear them,
(3) practice the conversations with another student.
Conversation #1:
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Jorge: |
I need to hold these two pieces of metal together while I drill a hole through them. What tool should I use? |
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Pedro: |
Use a clamp. There’s a parallel clamp in the box under the bench. |
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Jorge: |
I have a C-clamp already. Can I use that? |
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Pedro: |
Sure! Go ahead! |
Conversation #2:
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Jorge: |
I need to loosen this screw on the machine. What tool should I use? |
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Pedro: |
That looks like a Phillips screw. Use a Phillips screwdriver. The end of the screwdriver will fit into that star-shaped slot. |
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Jorge: |
Yes, it’s a Phillip screw. I’ll get a Phillips screwdriver from my tool box. |
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Pedro: |
Here, you can have mine. But please give it back. |
Conversation #3:
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Jorge: |
I need to tighten a screw on this lathe, bit it’s in a narrow place. What should I do, Pedro? |
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Pedro: |
Use an offset screwdriver. You will be able to reach it. |
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Jorge: |
Yes, you’re right. The offset will go inside that narrow place and fit into the slot. |
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Pedro: |
Jorge, if you don’t have an offset screwdriver, you can make one by bending the end of any screwdriver that has a straight blade. |
CLAMPS AND SCREWDRIVERS vocabulary practice 5
Read again the Student Information Sheet, The Purpose of These Tools.
End of Lesson Listening Test Questions
Look at the pictures. Listen to the words on the recording. Write the correct letters next to the numbers below.
Click here to listen to the recording.
End of Lesson Writing
