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Machine Theory > Lathe Operations > Flashcards

Lathe Operations Flashcards

1
Q

What is the imperial formula for determing RPM?

A
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2
Q

What is the metric formula for determing RPM?

A
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3
Q

Although lathes perform many operations, __________ is the most common.

A

Turning.

Turning refers to roatating a workpiece and reducing its diameter with a cutting tool

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4
Q

The feed rate is the speed at which the tool is fed into the workpiece. It is measured in _______________.

A

Millimetres or Inches per revolution.

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5
Q

A right-hand turning tool cuts from the __________ to the __________.

A
  • Tailstock
  • Headstock
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6
Q

A left-hand turning tool cuts from the _________ to the __________.

A
  • Headstock
  • Tailstock
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7
Q

For reamed holes smaller than 1/2 inch use a drill that is __________ undersize

A

1/64

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8
Q

For reamed holes larger than 1/2, use a drill that is __________ undersize.

A

1/32

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9
Q

What are the two primary purposes of cutting fluids?

A
  • Reduce heat
  • Provide lubrication to reduce friction
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10
Q

The most common lathe operation is:

A

Turning

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11
Q

Cutting speed refers to:

A

How fast the workpiece travels past the tool.

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12
Q

Turning is most commonly done with a?

A

Right-hand tool

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13
Q

An infeed of 0.050” on a direct reading cross-slide would result in a diameter reduction of?

A

0.050”

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14
Q

You are maching a 4.5 inch diameter steel shaft with a carbide tool. To machine it at 290 surface feet per minute, what should the approximate RPM of the spindle be?

A

255 RPM

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15
Q

What would the spindle rpm need to be for drilling a 1.25 inch hole in a 3 inch diamter steel shaft with a cutting speed of 100 SFPM?

A

320 RPM

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16
Q

The boring operation on a lathe increases the?

A

Diameter of a hole in a workpiece.

17
Q

The reamer is used to:

A

Produce smooth and accurate holes

18
Q

How does the speed and feed of a reamer compare to a drill?

A

Rpm is slower and the feed is faster.

“Half the speed, twice the feed.”

19
Q

What is the correct spindle speed when drilling a 3 inch diameter piece of aluminum with a 1/2 inch HSS drill and a cutting speed of 600 SFPM?

A

4800 RPM

20
Q

The pitch of a thread cut on a lathe is controlled by the?

A

Lead screw.

21
Q

The finish on a thread can be enhanced using?

A

Cutting Oil

22
Q

The thread chasing dial tell you when?

A

To engage the split nut.

23
Q

When finishing with an emery cloth, the end held in your left hand passes under the workpiece and the end coming over the top is held in your right hand.

  1. True
  2. False
A

True

24
Q

The result of knurling is?

A

A workpiece slightly larger in diameter

25
Q

To achieve a good knurl, you should?

A

Flood the workpiece with coolant

26
Q

When grinding a workpiece between centres, you would feed with?

A

The carriage feed

The carriage traverses the grinder along the workpiece. The crossfeed is used for depth.

27
Q

What is a negative result of using a tool post grinder on a lathe?

A

The dust can destroy the ways.

28
Q

Cutting fluids are used mainly for?

A

Decreasing Heat and Friction.

Machine Theory (7 decks)

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