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15 Cards in this Set
- Front
- Back
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Where is a protractor used?
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for constructing lines for angles other than 45 or 90 degrees
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How is a point marked with a prick punch?
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By using light taps with a small ball peen hammer.
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WHat is used to scribe a circle with a radius larger than dividers?
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Trammel points
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Where are dividers used?
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To scribe arcs and circles, to transfer measurements from a scale to the layout, and to transfer measurements from one part of the layout to another.
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What is a stretchout?
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A pattern on a flat sheet which has not been formed into a three dimensional object.
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How do you compute circumferance?
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multiply the diameter by PI or 3.1416
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Why are edges formed?
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To improve the appearance of the work, to strengthen the piece or to prevent a sharp edge
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How are sheetmetal edges formed?
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form the metal itself by inserting wire, or by attaching a band or angle iron.
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Name the three kinds of lap seams?
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plain, offset, and corner.
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How are lap seams joined?
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By drilling and riveting , by soldering or by a combination of both riveting and soldering.
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What is the rivet allowance for a lap seam?
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5 times the diameter of the rivet.
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Where are grooved seams used?
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In the construction of cylindrical shapes.
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What are the two types of grooved seams?
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Outside and inside.
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What is the allowance for a grooved seam?
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3 times the width of the lock.
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What is the pittsburgh lock seam?
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A corner seam which is used to advantage in rectangular ventilation lines, elbows and boxes.
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