Trade Related Preperation Exam

How To Read A Micrometer.

https://youtu.be/856QfHWjXHo?si=7Flqo4f5puvejxl4 https://youtu.be/j0ARvWwMZX8?si=tZtQR_sf7jRQAcwe Main Scale Sleeve: First Tick .25 second Tick .50 Thrid Tick .75 etc... 1... 1.25... 1.5 Gauge Line: If the line, lines up perfectly with the THIMBLE then good pick that number If it is in between two numbers than you selec the lower number ie. if its in between 5 & 6 you Pick 6

Principle of the Vernier

https://youtu.be/fnp4HvDltUI?si=LgHYDES8ha0QngX- Main scale reading = Cm Vernier Scale Reading = Mm

What is A try square..?

is used strictly for setting or checking lines or surfaces that have to be at right angles to each other. 90 Degrees

Which of the following is a correct statement about a vernier scale?

A vernier scale is a small set of graduations placed alongside a main scale.

You're planning to buy a boat, a motor, and some miscellaneous boating equipment. The boat costs $325, the motor costs $225, and the equipment costs $79. If you've saved $438 toward these purchases, how much more do you need to save?

A. $191 You're planning to buy a boat, a motor, and some miscellaneous boating equipment. The boat costs $325, the motor costs $225, and the equipment costs $79. If you've saved $438 toward these purchases,$191 more do you need to save. total cost = $325 + $225 + $79 = $629. Amount saved = $ 438 , More saving = $629 - $ 438= $191.

Which one of the following distances is the longest?

A. 7 feet B. 3 Yards = 15 feet C. 525 inches D. Deez

2. The ability to get the same answer when compared to a reference standard is called _______.

Accuarcy

Whats is a Combination Sets in relation measuring instruments.

All you need is a ruler, a square head, the protractor head, and the center head.

How many full turns of a thimble will move the spindel of an english micrometer 1/2 inch?

Answer 20 .. why? becuase... inch system micrometer look at the division on the sleeve and thimble. The spindle screw is made so that one revolution moves the spindle 0.025 inch toward or away from the anvil . This means that 40 turns of the screw will move the spindle exactly 1 inch (40 ×0.025=1.000). So 20 x 0.025 = .5

Using symbols, write write two feet six inches.

Answer: 2′6′′

Using symbols, write 1. sixty degrees, twenty-two minutes, and ten seconds..

Answer: 60°22′10′′

3. When you're measuring a workpiece with a micrometer, you place the piece between the _______ and the _______ of the micrometer.

Anvil and the Spindle of the micrometer.

4. Convert 0.750 inches to millimeters. _______.

0.750 inches x 25.4 millimeters = 19.05 millimeters

STUDY THE RULER FAM

1 1 3 1 5 3 7 1 9 -- | -- | -- | -- | -- | -- | -- | -- | -- | 16 8 16 4 16 8 16 2 16

3. What is the length of the piece of tubing shown being measured below?

1 and 5/32 in. LOOK AT THE RULER WHAT IS IT BROKEN DOWN INTO?? 32nds How? Count all the little ticks starting at 1 inch up to 2 inches there are 32 ticks. so 1 inch plus 5 ticks according to this ruler.... 5/32 Watch video copy and paste https://youtu.be/8SQswYo4mbM?si=hr3SZ2rFCZ5NV3EJ

Conversion Factors

1 m = 39.37 in. 1dm = 3.937 in. 1 cm = 0.3937 in. 1 mm = 0.03937 in 1 dm = 0.1 m 1 cm = 0.01 m 1 mm = 0.001 m 1 in. = 0.0254 m 1 in. = 0.254 dm 1 in. = 2.54 cm 1 in. = 25.4 mm

Some Conversion Factors

1 meter = 39.37 in. 1dm = 3.937 in. 1 cm = 0.3937 in. 1 mm = 0.03937 in.

Convert 2 meters to inches.

1 meter is equivalent to approximately 39.37 inches. Therefore, to convert meters to inches, you multiply the number of meters by the conversion factor (39.37 inches/meter). So, if you have 2 meters × 39.37 inches ≈78.74 inches This multiplication of 2 meters by the conversion factor gives you the approximate equivalent in inches, which is 78.74 inches for 2 meters.

6. If the radius of a circle is 50 mm (millimeters), its circumference is _______ mm.

100mm

5. Convert 12.7 millimeters to inches. _______.

12.7 millimeters / 25.4 inches/mm = .5

Final Exam Question !!! you better know how to convert mm to inches and inches to mm Convert 12.7 Millimeters to inches.

12.7 mm / 25.4 = .5 inches

6. What is the reading on the 0 to 25 mm micrometer shown below? _______

15 + The First Little Tick which equal .5 becuase it it in Millimeters + look at the thimble it is lined up perftefly with the sleeve which says 20 so 15. .50 + .20 = 15.70mm

Subtract the quotient of 15 / 3 from the sum of 33 and 7 NOWWWWW.

15 / 3 = 5 33 + 7 = 40 40 - 5 = 35

Convert 150 cm to inches

150 / 2.54 = 59.05511811023622

solve 16.24 / 1000

16.24 divided by 1000 = 0.01624

Write 1,386 as the product od it prime factors?

2 x 3 x 3 x 7 x 11

To turn 2/5 into a decimal, what operation must you perform?

2/5 = 2 ÷ 5 = .4

Final Exam Question!! you better know how to convert mm to inches and inches to mm Convert 203.2 millimeters to inches.

203.2 mm / 25.4 = 8 inches Remeber there is .0393701 inches in a MM so if you get a answer that seems to high like 20 or 140 inches you propably did something wrong beacuse they would of had you convert it in feet cause who is gonna say 144 inches when you could just say 12 feet

What is 3/10 as a percent?

30%

2. What is the measurement between the arrows in the sketch below?

4 & 3/8 inches 0 | 1/8 | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 1 inch https://youtu.be/8SQswYo4mbM?si=hr3SZ2rFCZ5NV3EJ

1. What is the measurement indicated by the arrows in the sketch below? _______

4 3/8 inches

2. What is the reading on the vernier caliper scale shown below? The scale is graduated in inches. _______

4 INCHES 3.1cm .014mm = 4.314inches https://youtu.be/npPjzJ8oKc4?si=mquRvxB1nfVY7DfU https://youtu.be/fnp4HvDltUI?si=vLnBD1zZtHhNS7K4

You sold your soul for $189,000. Coulda been records commission was 4.5% of the selling price. How much money are you left with after they get thier money?

4.5 x 189,500 = 852750 ------------------ 100 x 1 = 100 852,750 / 100 = 8,527.5 189,500 - 8,527.5 = YOUR ANSWER ($180,500)

4. How much fencing would you need to fence in a rectangular storage area that measures 40' x 20'?

40 + 40 + 20 + 20 = 120 feet

Which of the following shows why the commutative property doesn't work under subtraction?

5 - 1 = 1 - 5 shows why the commutative property doesn't work under subtraction. 5-1 = 4 1-5 = -4

Which is another way to check the sume of 104 + 34 +228 + 887?

887 + 228 + 34 + 104

What is Traceability?

A company can then state that they can trace their measurements directly to the national standard. Traceability is an unbroken chain of comparisons from your measurement to a national standard. Traceability is how we maintain accuracy between companies and throughout the world.

3. The smallest graduation on a measuring instrument is called its _______.

A exmaple is a tape measure... it has marks every 1⁄8 of an inch. Each mark is a graduation. The smallest graduation is the RESOLUTION of the measuring tool.

Master Precision Level

A master precision level, shown in Figure 18, is designed for use in setting up machinery of all types. The efficiency of modern high-speed machinery depends to a large degree upon the levelness of the machine setup. When a machine doesn't work properly, the machine itself often is condemned when, actually, the trouble is caused by improper leveling of the machine. With a master precision level, machine operators, setup personnel, and maintenance workers can tell at a glance the exact variation in the levelness of machinery and make the necessary adjustments.

Whats is A Steel Straightedge

A straightedge is simply a fairly long bar of steel having one or both of its longer edges perfectly straight. To test the trueness of a surface, place the steel straightedge on the surface and note whether the straightedge is in contact with the surface at every point. If the straightedge touches the surface at only some points, indicated by visible light between the straightedge and the surface, the points of contact are higher than the surrounding portions of the surface. Such a surface isn't true.

2. Which of the following describes the size of a cabinet that's 4 ft long, 6 ft wide, and 2 ft high?

c. 4' x 6' x 2'

What are calipers

Calipers are another type of tool used for measuring distances.

if postage costs $.54 for the first ounce and $.22 for each additional ounce, calculate the cost of mailing a 10-ounce envelope.

If postage costs $.54 for the first ounce and $.22 for the each additional ounce, $2.52 is the cost of mailing a 10- ounce envelope. 10-first oz=9oz 0.54 for first 0.22 times 9=1.98 total is 1.98+0.54=2.52

1. The length, the width, and the height of an object are called the _______ of the object.

Dimensions

A dial caliper would provide a(n) _______ measurement.

Direct nstead of using a vernier mechanism, which requires some practice to use, the dial caliper reads the final fraction of a millimeter or inch on a simple dial. In this instrument, a small, precise rack and pinion drives a pointer on a circular dial, allowing direct reading without the need to read a vernier scale.

How can you tell if a number is divisble by 3?

Divisibility rule for 3 states that a number is completely divisible by 3 if the sum of its digits is divisible by 3. Consider a number, 308. To check whether 308 is divisible by 3 or not, take sum of the digits (i.e. 3+0+8= 11). Now check whether the sum is divisible by 3 or not. The sum of the digits is a multiple of 3

Which operation is the opposite of multiplication?

Division

Drill Point Gage

Drill point angle gauges, also known as drill point gauges and drill sharpening gauges, are used to gauge the angle of a bit to ensure it's been sharpened to the correct angle.

3. The foot, yard, and inch are (English, metric) units of length.

English system

What is a Center Head?

FIGURE 14—You can use the center head to find the center of round stock or to extend a line around a corner.

Steel Rulers

Figure 7A, to ensure the end of the rule is truly flush with the edge of the workpiece. If the entire end of the rule is also worn down, you may still get an accurate measurement by offsetting the rule as shown in Figure 7B. With this method, you can use one of the graduations unaffected by the wear on the edge of the rule as your index mark. Simply align the end of the workpiece with this index mark and measure to the end of the piece.

Solve 2/3 +5/6 and put the answer in simplest form

First Find the LCM = 6 2x3 = 6 2x2 = 4 4 + 5 9 -------- = ------ = 3/2 6 + 6 6

Each graduation on the thimble of a metric micrometer is equal to?

For a standard metric micrometer, the pitch might be 0.5 mm, and if the circular scale (thimble) has, say, 50 divisions: Least count = Pitch / Number of divisions Least count = 0.5 mm / 50 Least count = 0.01 mm Therefore, each graduation or division on the thimble of this micrometer represents 0.01 millimeters (or 10 micrometers) in measurement. Or This moves the spindle by 0.01 millimeter. This means each graduation on the thimble is equal to 1/50 of 0.5 millimeter or 0.01 millimeter. Thus least count of metric micrometer is 0.01 mm.

Using the information in the tolerance notes the tolerances of the dimension shown in Figure 5 can be easily understood.

For example, the dimension 5⁄16, in the left view, shows that the height of the main casting is 5⁄16 in.; the note shows that this can vary ± 1⁄64 in

Tape Meausre

For measuring longer distances, a tape rule like the one in Figure 9 is most often used. A tape rule usually has a hook attached at the end for catching the edge of a workpiece. The hook may appear loose, but it's really made that way on purpose. The play in the hook's movement is equal to the thickness of the hook.

0.011811 inches to millimeters?

Given 0.11811 inch: 0.11811 inch × 25.4 millimeters/inch ≈3 millimeters Therefore, 0.11811 inch is approximately equal to 3 millimeters.

Conversion Factor 1: INCHES

If starting with INCHES use the number the thre number 2.54 This value represents the conversion factor between inches and millimeters or centimeters. There is 0.0254 meters in 1 Inch There is 0.254 decimeters in 1 inch There is 2.54 cm in 1 inch There is 25.4mm in 1 Inch

Accuracy and Precision

Imagine throwing darts at a dart board. Suppose you're able to hit the same place every time on the dart board, but it's not the center. In other words, the darts are in a tight grouping some distance away from the center. Your dart throwing is precise. You can hit the same place every time, but it's not in the bull's-eye. Precision is the ability to get the same answer each time you measure an object.

A striper pole is 78 inches long and is to be cut into pieces 3 3/4 inches long. How many peices can be cut?

LOOK take 3/ 34 = 3.75 so 78 / 3.75 = 20.8 20 IS YOU ANSWER CUH

What is Machinist's Level?

Levels are tools designed to prove whether a plane or surface is true horizontal or true vertical. The frame of a machinist's level (Figure 17) is generally made of cast iron or aluminum and has two comparatively long parallel sides. When the bubble in the bubble tube is at the center of the tube, as indicated by its position with respect to centering marks on the tube, the long sides of the frame are exactly horizontal. If the sides aren't horizontal, the bubble will be nearer the higher end of the tube. The instrument may be used to find out whether a line or surface is horizontal.

What is Linear measurements?

Linear measurement is a means for expressing the distance between two points. Each linear measurement begins at a reference point and ends at a measured point.

Convert 10 mm to inches.

MILLIMETERS TO INCHES = DIVISON To convert 10 millimeters to inches: 10 millimeters÷25.4 millimeters/inch≈0.39 inches Therefore, 10 millimeters is approximately equal to 0.39 inches.

When combining leaves on a thickness gauge, you should?

Make sure each leaf is clean.

The number on top of a fraction is called the?

Numerator

On a 50-question test, a student answered 5 questions incorrectly, what percent didi the studnet answer correctly?

On a 50-question test, a student answered 5 questions incorrectly. The percentage of the students who answered correctly is 90%. 5/50 = 50/5 = 10 Percent leaves with 90 percent remaing

if you suspect the edge of your rule has a rounded corner from use, you should?

Overlap the edge of the work piece with the rule and measure from another graduation.

5. The formula for the perimeter of a square is _______ .

P = 4a

If the measurement of one side of a square piece of tile equals 250mm, the perimeter of the tile is????

P=4a 250mm x 4 = 1000mm

find the difference between the product of 21.33 and 2.04 and the sum of 1.115,3.18 ,22.0613 and 12.2384

Product = 21.33 * 2.04= 43.5132; sum = 1.115 + 3.18 + 22.0613 + 12.2384 = 38.5947; The difference between the product of 21.33 and 2.04 and the sum of 1.115, 3.18, 22.0613, and 12.2384 is 4.9185.

1. A strip of metal graduated in English or metric units of measurement and used for measuring is a(n) _______.

Rule Or Scale

Inch Visiual Break Down

Study it watch a yt video on it, remeber it you gonna need to know it..

what would be the metric equivalent of 1/2 inch?

Sure, to convert 1/2 inch to millimeters: 1 inch is approximately 25.4 millimeters. So, 1/2 inch in millimeters would be: (1/2) inch * 25.4 millimeters/inch = 12.7 millimeters Therefore, 1/2 inch is equal to 12.7 millimeters in the metric system.

Final Exam Question !!!! Rule of 10

The Rule of 10 states that any measurement instrument you use should be 10 times more accurate than the tolerance you're trying to hold. Tolerance is the amount of variation allowed from the target dimension or size. Another way to state the Rule of 10 is to say that the error in your measuring tool shouldn't account for more than 10% of the tolerance.

The basic unit of length in the metric system is??

The basic unit of length in the metric system is the meter (metre in British English).

Distance

The distance between any two points on a workpiece is relayed to the machinist by a shop print similar to that shown in Figure 1. Such a distance is referred to by the machinist as a dimension, and the workpiece is often called the part

What is (NIST)?

The government keeps the national standards at the National Institute of Standards and Technology (NIST)

4. On a metric micrometer, one full turn of the thimble will move the spindle (0.5 mm, 1 mm).

The graduations on a micrometer sleeve are arranged so that one complete turn of the thimble moves the spindle 0.025 INCHES., or one graduation on the sleeve. So, four turns of the thimble will move the spindle 0.100 INCHES., or four graduations on the sleeve. In Terms of MILLIMETERS one complete turn of the spindle will be .5 or .50 MILLIMETERS and 2 Complete turn would be 1 MILLIMETER. FINAL ANSWER 0.5mm

If the outside diameter of a pipe is 36 inches, the length of a piece of insulation wrapped around it is...

The length of a piece of insulation wrapped around a pipe, also known as the pipe's circumference, can be calculated by using the formula: In this case, since the given outside diameter of the pipe is 36 inches, we multiply this by π (approximately 3.14) to find the circumference. So, the calculation would be: Circumference = π * 36 = 113.04 inches approximately. Hence, the correct choice is A. 113.04 inches.

The meter can be subdivided into units of tens

The meter can be subdivided into units of tenths, hundredths, or thousandths. The decimeter (dm) is equal to 1⁄10 m, or 0.1 m. The centimeter (cm) is equal to 1⁄100 m, or 0.01 m. The millimeter is equal to 1⁄1000 m, or 0.001 m. Thus, there are 10 dm, 100 cm, and 1000 mm per meter.

If the length of a rectangular room is 22 feet and its width is 20 feet, the perimeter of the floor area is

The perimeter of a rectangle can be found by adding together the lengths of all its sides. For a rectangle with length L and width W: Perimeter P = 2L + 2WP=2L+2W In your case, the length of the room is 22 feet and the width is 20 feet: P = 2 \times 22 \, \text{feet} + 2 \times 20 \, \text{feet}P=2×22feet+2×20feet P = 44 \, \text{feet} + 40 \, \text{feet}P=44feet+40feet P = 84 \, \text{feet}P=84feet Therefore, the perimeter of the floor area of the rectangular room is 84 feet.

if your measurement of one side of square piece of tile shows it to be 300mm, the perimeter of the tile

The perimeter of a square is found by multiplying the length of one side by 4 since all sides of a square are equal. If one side of the square tile measures 300mm, the perimeter would be: Perimeter = 300mm * 4 Perimeter = 1200mm So, the perimeter of the tile would be 1200 millimeters.

6. Where on the screw pitch gage can you find the number of threads per inch?

The pitch of a thread is the distance between each thread and is expressed as the number of threads per inch. To determine the pitch of a thread, you find the leaf that will exactly fit into the thread of the screw or workpiece and read the size on that leaf. Screw pitch gages are made in a wide range of sizes and come with different numbers of leaves each for a different pitch. The number is printed on each leaf of the gage.

The proper way to position the rule is???

The proper way to position the rule is shown in the lower view of Figure 8. A light downward pressure should be exerted on the rule, and a light horizontal pressure to the left should be exerted on the outer end. This ensures full contact with the workpiece. The reading can now be taken with a degree of accuracy.

Final Exam Question !!!!! 1. The range of variation allowed on the dimension of a manufactured part is the _______ .

The range of variation allowed for dimensions is the tolerance.

The solution to 2 × 27 will be what kind of number? A. Perfect square B. Prime C. Even D. Odd

The solution to 2 × 27 is an Even number. 2 x 27 = 54

The solution to 5 × 1 will be what kind of number?

The solution to 5 × 1 will be a prime number.

Using the information in the tolerance notes the tolerances of the dimension shown in Figure 5 can be easily understood. Further Explained..

The tolerance for the 0.4731 turned boss is + 0.000 − 0.001, and the tolerance for the 0.375 hole is + 0.001 − 0.000. The tolerances accompany these dimensions because they're less than the ± 0.003 noted. The tolerances shown on this print don't apply to every machine shop. Although the prints themselves are used, the tolerances will vary from one company to another.

5. What exactly are you feeling for when you use a feeler gage?

Thickness gages are also called feeler gages because of the way they're used. To use a thickness gage, select a gage close to the size of the gap you wish to measure. Pass the gage through the gap. You should feel a slight drag on the gage as you pass it through the gap. If you don't feel anything, select the next larger gage and try again. https://youtu.be/QPcBU6P-rjk?si=n-PpMPn6Qm7Y6Tzt

A feeler gage may be made out of...?

Thickness gages are thin strips or leaves of metal of a known thickness and are usually sold as a set as you see in Figure 16.

What is a thickness gage?

Thickness gages are thin strips or leaves of metal of a known thickness and are usually sold as a set as you see in Figure 16. They're used to measure a gap or the space between two objects.

4. The type of caliper shown below is used for taking (direct, indirect) measurements from the (outside, inside) of objects.

This is an inside Spring Caliper Spring and transfer calipers provide indirect measurements

convert 5 cm to inches.

To convert 5 centimeters to inches, you can simply divide 5 by 2.54: 5 centimeters÷2.54≈1.97 inches So, 5 centimeters is approximately 1.97 inches.

Convert 0.625 inches to millimeters

To convert inches to millimeters, you can use the conversion factor: 1 inch = 25.4 millimeters So, to convert 0.625 inches to millimeters: 0.625 inches * 25.4 millimeters/inch = 15.875 millimeters Therefore, 0.625 inches is equal to 15.875 millimeters.

Convert 3.125 inches to millimeters

To convert inches to millimeters, you can use the conversion factor: 1 inch = 25.4 millimeters So, to convert 3.125 inches to millimeters: 3.125 inches * 25.4 millimeters/inch = 79.375 millimeters Therefore, 3.125 inches is equal to 79.375 millimeters.

How might one determine accuracry?

To determine accuracy, you compare your measurement to a standard. A standard is an object that everyone agrees to use as the correct value for comparison Ie you can use a Gage Block

Final Exam Question !!! If a triangle shaped machine part has sides of 2 1/2 inch., 3 1/4 inch., and 5 inch., the perimeter of the triangle is

To find the perimeter of the triangle, add up the lengths of all three sides. Given: Side 1 = 2 1/2 inches = 2.5 inches Side 2 = 3 1/4 inches = 3.25 inches Side 3 = 5 inches Perimeter = Side 1 + Side 2 + Side 3 Let's calculate: Perimeter = 2.5 inches + 3.25 inches + 5 inches Perimeter = 10.75 inches Therefore, the perimeter of the triangle-shaped machine part is 10.75 inches.

Micrometer in meters VS inches

VERY IMPORNTANT TO KNOW IF YOU MICROMETER IS IN INCHES OR MILLIMETERS.. https://youtu.be/C--TRJcABho?si=NFnMHdYVWBvWY0_k The Big Difference When Reading A Micrometer is when reading for the SLEEVE if it is in inches the it starts at 0 -> .25 of an inch then .50, .75, 1, 1.25 etc Inches: .25 of An Inch = 0 -> .25 of an inch then .50, .75, 1, 1.25 etc Meters: .50 Of A mm = .5 , 1, 1.5, 2, 2.5, 3

Cylindrical Square in realtion to finding the ¨out-of-squareness¨ on a workpiece

You use the Cylindrical square to the mate part or the part that we want to insepct to see how square it is. One way to check to see if the part is not square is to use a peice of paper and a light. Look at the picture to see an exmaple.

before measuring with a digital caliper, you should

close the and jaws and zero the caliper

Final Exam Question! 1. The ability to get the same answer each time you measure is_______.

percision