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Machine Theory > Drilling > Flashcards

Drilling Flashcards

1
Q

Which variable is the most important when determining spindle speed?

A

Diameter of the drill

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2
Q

Any machined surfaces on a drill press that could rust must be ________________.

A

Kept clean and oiled

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3
Q

When using a magnetic base drill to drill horizontally, what safety precautions must you take and why?

A

Be sure the power supply to the drill is secure and that any joints in the electric cord are knotted at the joint. Chain the drill to a secure support. This drill is heavy and can cause serious injury if it drops suddenly.

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4
Q

When installing a taper shank drill into the spindle bore, you must take several precautions. What are they and why?

A

Make sure that the drill taper and the bore are both clean. Wipe them with a rag. Be careful not to scrape or mark the internal taper of the spindle bore. Any burrs in the taper will throw your drill bit off centre and prevent a tight fit for the drill.

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5
Q

Cutting speed refers to:

A

Peripheral speed

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6
Q

How fast should a 1/2 inch drill turn when drilling mild steel if the cutting speed (CS) is 90 surface feet per minute?

A

720 RPM

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7
Q

Small drills require a higher feed per revolution than larger ones.

  1. True
  2. False
A

False

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8
Q

Which abbreviation is used to express the feed rate on a drill press?

A

IPR - Inches Per Revolution

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9
Q

A drill press spindle has a #2 Morse taper. A twist drill with a #3 Morse taper shank must be mounted in the spindle. How should you secure the drill in the spindle?

  1. Use a drill sleeve
  2. Use a drill socket
  3. Use a Jacob’s keyless drill socket
A

Use a drill socket.

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10
Q

To remove a tapered shank twist drill from the drill press spindle, use a:

A

Drill Drift

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11
Q

Drill chucks may be mounted in the drill press spindle or a tapered shank by means of a:

A

Taper of Thread

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12
Q

V-blocks are used mostly on the drill press for?

A

For holding round stock for cross drilling

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13
Q

To clamp a workpiece correctly with a straight clamp, you must?

A

Place the bolt close to the workpiece, and the clamp should be level or slightly raised on the tail end.

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14
Q

When using a sensitive drill press, what should you do as the drill breaks through the workpiece?

A

Ease up on the pressure

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15
Q

The recommended drill size for reaming a 3/8 inch hole on a drill press is:

A

23/64th

Leaving 1/64th for the reamer.

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16
Q

The included point angle of a countersunk hole for most flathead screws is:

A

82 degrees

17
Q

Which type of machine tap will push the chip out ahead of the tap?

A

Spiral point (gun) tap

18
Q

The lip relief (clearance) angle on a drill should be:

A

8 to 12°

19
Q

A general-purpose drill bit for drilling most metals has an included point angle of:

A

118°

20
Q

Carbide drills may be operated at a cutting speed how many times faster than high-speed steel drills?

A

Three

21
Q

A drill that is ground with lips of unequal length will drill a hole which is:

A

Oversized

22
Q

The hand drill is quicker and more versatile than any drill press for:

A

For drilling small non-vertical holes

23
Q

Electric hand drills are limited by :

A

The amount of feed pressure (and rpm) that can be applied to large-diameter drills

24
Q

A magnetic-base drill offers:

A

More control of the feed pressure, torque and drilling angle than are possible with a large hand drill

25
Q

The most common sizes of three-jaw chucks found on a magnetic-base drill are:

A

1/2 inch and 3/4 inch only.

26
Q

Name 5 types of drilling machines:

A
  1. Sensitive Drill Press
  2. Upright Drill Press
  3. Hand Drills
  4. Magnetic Base Drills
  5. Radial Drilling Machines
27
Q

Name the three parts to a twist drill bit:

A
  1. Point
  2. Body
  3. Shank
28
Q

Name the two types of shanks commonly found on a twist drill bit:

A
  1. Taper Shank
  2. Straight Shank
29
Q

What is the TPF of a Morse taper?

A

5/8 inch taper per foot

30
Q

For Review

A
  1. Flute
  2. Heel
  3. Lip or cutting edge
  4. Web
  5. Chisel Edge
  6. Lip Clearance
  7. Margin
  8. Land
31
Q

Fractional size drills are available in diameters from 1/16 inch to 4 inches. They increase in size by increments of 1/64 inch, up to a diameter of 1 3/4 inch. Thereafter they increase by increments of 1/32 inch.

A

For Review

32
Q

Number size drills range from #97 (0.0059 inch) to #1 (0.228 inch) in diameter. The increment between sizes increases as the drills get larger.

A

For Review

33
Q

Letter size drills range from 0.234 inch to 0.413 inch in diameter and are identified by a letter ranging from A (smallest) to Z (largest). The letter range picks up where the number range leaves off.

A

For Review

34
Q

Metric size drills range from 0.04 mm to 80 mm in diameter. The increment between sizes increases as the drills get larger.

A

For Review

35
Q

What is the general rule for sizing a pilot hole?

A

Pilot hole should be the same size as the chisel edge.

Machine Theory (7 decks)

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