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Mill Theory 1300 > Mid-Term > Flashcards

Mid-Term Flashcards

1
Q

When is it safe to leave operating machinery unattended?

A

Never

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2
Q

What is the hazard of rags around moving machinery?

A

They can pull you in.

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3
Q

What state must a machine be in before repairing?

A

Zero-Energy State.

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4
Q

Storage drums must be grounded to avoid which hazards?

A

Static spark and combustion.

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5
Q

A safe pressure for shop airlines is?

A

30 psi.

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6
Q

What shape is a class A fire extinguisher symbol?

A

Triangle.

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7
Q

What shape is a class B fire extinguisher symbol?

A

Square.

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8
Q

What shape is a class C fire extinguisher symbol?

A

Circle.

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9
Q

What shape is a class D fire extinguisher symbol?

A

Star.

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10
Q

Proper lifting requires?

A

A straight back and leg muscles.

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11
Q

A Class A fire could be?

A

Paper or wood combustibles.

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12
Q

A Class B fire could be?

A

Chemicals/solvents ie. Varsol, grease.

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13
Q

A Class C fire could be?

A

Electrical components.

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14
Q

A Class D fire could be?

A

Metals ie. Magnesium, lithium, etc.

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15
Q

What is the typical function of V blocks?

A

Hold round, square or octagonal stock.

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16
Q

Which angles are quickly compared with the square head of a combination set?

A

45 or 90 degrees.

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17
Q

The centre head of a combination set has which included angle?

A

90 degrees.

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18
Q

What is the function of a protractor head in a combination set?

A

To compare or layout semi-precise angles.

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19
Q

Which liquid is used to contrast steel for scribing lines?

A

Layout blue.

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20
Q

What is the function of dividers?

A

Bisect any angles, scribe arcs and circles, compare layout points.

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21
Q

What is the function of trammels attached to a beam?

A

Layout large arcs and circles.

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22
Q

Which method is used to check squares of large layout pieces?

A

-

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23
Q

Why are surface plates used with care?

A

They maintain a level of accuracy for the shop work.

24
Q

Which is the best material for surface plates?

A

Granite.

25
Q

What is the purpose of prick punching before machining?

A

Layout lines are often removed with machining.

26
Q

How is cross filing done?

A

Using a double cut file for fast removal of material by cross cutting.

27
Q

What is the function of a file card?

A

To clean a file.

28
Q

Why don’t you use a scale for deburring?

A

It reduces the accuracy of the scale.

29
Q

How is a micrometer calibrated?

A

Measure a known distance and adjust the nut using a C Wrench.

30
Q

What is the smallest bore size an inside micrometer can measure?

A

1.500”

31
Q

One rotation of a metric micrometer thimble advances it how much?

A

0.50 mm

32
Q

How is a depth micrometer read?

A

Graduations are reversed from an outside micrometer.

33
Q

What two levels of accuracy can be obtained with a metric vernier micrometer?

A

0.05 mm - 0.02 mm

34
Q

What level of accuracy can be obtained with a Standard (non-vernier) micrometer?

A

0.001” (One Thousandth)

35
Q

How many graduations on either side of zero on a bevel protractor?

A

12

36
Q

How many graduations on the thimble of a metric micrometer?

A

50

37
Q

How would you compare outside dimensions?

A

Outside calipers.

38
Q

Layout of angles with a Sine bar and gauge blocks is?

A

The most accurate method.

39
Q

Which tool is used to measure small diameter holes?

A

Hole gauges.

40
Q

Calipers and dividers (protractors) are which type of tool?

A

Comparison.

41
Q

Which tool is used to quickly check accuracy of specific parts?

A

Fixed gauges (Go/No-go).

42
Q

What is the smallest graduation on a 6” scale?

A

1/64th of an inch.

43
Q

How is imperial tap drill size calculated?

A

TDS = D -1/N

Major Diameter minus 1/ Number of threads per inch

44
Q

What hand tool is designated second cut?

A

Machinist file.

45
Q

For safety a cold chisel head should be ground to prevent?

A

Mushroom head that creates shrapnel.

46
Q

Tap drill size for M8 x 1.25 is?

A

6.75mm

TDS= M - P
* Major Diameter minus Pitch

47
Q

What is the ideal tip angle of a flat chisel for steel?

A

70 degrees. *Less for softer material.

48
Q

In which stroke is moderate pressure applied when filing?

A

Forward.

49
Q

What material are soft face hammers made of?

A

-

50
Q

How many teeth of a hacksaw should be in contact at all times?

A

Minimum of 2, Maximum of 24.

51
Q

Which hand tap is best suited to start a hole?

A

Taper.

52
Q

Which hand tap is best suited to finish a blind hole?

A

Bottoming.

53
Q

Which taps are used to cut threads in hard material?

A

Serial.

54
Q

What material are the hard jaws of a bench vise made of?

A

Cast steel.

55
Q

The temperature of the workpiece of will affect?

A

Accurate measurement.

56
Q

Draw filing gives a good finish and can be very accurate if using?

A

Single cut file, held 90 degrees to the direction of the work.

Mill Theory 1300 (1 decks)

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