forging new generations of engineers. scale reading basics
TRANSCRIPT
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Forging new generations of engineers
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Scale Reading Scale Reading BasicsBasics
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The English Scale
The English scale is an instrument that is used to measure linear distances. A typical English scale is made up of 12 inches.
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Scale Accuracy
The inch is fractioned into smaller increments. Usually, the smallest increment is 1/16th of an inch.
How big is 1/16th on an inch? You would need to stack about 16 sheets of paper to equal 1/16th of an inch.
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Two sheets of Paper stacked Human hair dia.
Paper Clip dia.
Proportioned section diagrams
1/128 inch.008
1/32 inch.031
Common Items: Size Comparison
1/256 inch.003
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The INCHThe divisions on an English scale are easily identified by different sized markings. The largest markings on the scale identify the inch.
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The INCHAll subsequent sized markings can be found by taking half of the previous measurement. i.e., half of an inch = ½ inch
1/2
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The INCHHalf of a half = ¼ inch. An English scale shows ¼ inch and ¾ inch marks. All fractions must be reduced to lowest terms.
1/4 3/4
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The INCHHalf of a quarter = 1/8 inch
1/8 3/8 5/8 7/8
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The INCH
1/163/16
5/16 13/167/16 11/16
9/1615/16
Half of an eighth = 1/16 inch
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Now Let’s practice
Question 1: What is the distance of A?
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¼”
The Fractional answer is:What would be the metric answer? .25 x 25.4= 6.35 or 6mm if rounding to the nearest mm.6mm
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The Metric Scale
The metric scale is another instrument that is used to measure linear distances. A typical metric scale is made up of approximately 300 mm.
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Scale Accuracy
The metric scale is divided into very small increments called millimeters (mm). There are 25.4 mm in one inch.
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The MillimeterThe millimeter is the smallest increment found on a typical metric scale.
1 mm
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The MillimeterThe next larger marking on a metric scale shows 5 millimeters.
5 mm
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The MillimeterThe largest markings on the metric scale represent centimeters (cm). These are the only marks that are actually numbered.
1 cm = 10 mm
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Let’s Practice
What is the metric answer for B
19mm
What would the answer be if converted to inches?
¾”