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Custom Metal Fabrication > Shop Power Equipment > Flashcards

Shop Power Equipment Flashcards

1
Q

Power shears are not made to cut materials in excess of 1/4”, True or false?

A

False

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2
Q

It is acceptable to remove the guards on a power shear, True or false?

A

False

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3
Q

List the parts of a shear?

A

Bed, side gauge, back gauge, knives, hold down fingers, knife guard, foot treadle, control panel, and shadow line

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4
Q

What does rake angle refer to?

A

The shearing made between the upper and lower shear knives of a guillotine-style plate shear, or ironworker flat bar shear.

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5
Q

On a power press brake, what is stroke length?

A

It is the amount of travel of the moving beam.

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6
Q

For what are the mechanical stops on the brake used for?

A

Ensure repeat ability, allows moving die to not travel at its full length, and allows change of speed.

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7
Q

What are the 3 advantages of rubber die?

A

Unlimited number of shapes can be formed, lower set up time, and reduces scuffing and marking.

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8
Q

Air bending requires ___ pressure than bottom bending.

A

Less

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9
Q

When braking metal, spring-back is compensated by?

A

Over bending the material slightly

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10
Q

When air bending metal up and including 1/2”, it is good practice to have the V-die opening of?

A

8 times the material thickness.

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11
Q

Shearing machines are broken down into which types?

A

Shear design and the drive systems

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12
Q

Power shears are capable of making cuts on metal ranging from?

A

30 Ga to materials in excess of a 1/4” plate steel

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13
Q

Stainless steel reduces the shear’s capacity by?

A

4 gauges

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14
Q

One should not expect a good cut on a strip that is smaller than?

A

8 times the material thickness

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15
Q

What machine uses power only when activated?

A

Direct-drive mechanical shear

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16
Q

What is the shear bed?

A

The flat horizontal portion in the front of the shear.

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17
Q

What is the side gauge?

A

The portion of the shear that is used to keep material at 90 degrees to the shear knives. It also has a ruler built into it.

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18
Q

What is the back gauge?

A

Allows you to make multiple cuts simultaneously and accurately and is adjustable.

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19
Q

What happens if the clearance becomes too large between the shear’s knives?

A

The metal being cut will be left with a burr.

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20
Q

What are the hold down fingers?

A

They are located in front of the knives and are used to hold the metal in place

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21
Q

What are knife guards?

A

They are mounted directly in front of the hold down fingers, and their main function is to keep you from accidentally slipping your fingers into the knives or hold down fingers.

22
Q

What is the foot treadle?

A

It is located on the front bottom of the shear and is usually a bar that runs along the entire length of the shear or a foot pedal that actives the shear when it is depressed.

23
Q

What is the control panel?

A

It is located at the front of the shear and it is the point at which you can set up the length, material gauge, and where the back gauge is adjusted.

24
Q

What is the shadow line?

A

A line that runs parallel to the knives on the shear. Its function is to provide a guide for cutting material.

25
Q

What is blade clearance?

A

The distance between the upper and lower shear knives.

26
Q

The guards on a shear must never be ____

A

Removed

27
Q

What must you do before you operate a shear?

A

A visual inspection

28
Q

What is one of the most versatile pieces of equipment in any shop?

A

The power press brake

29
Q

All power press brakes are rated in?

A

Tons

30
Q

If the brake is 120 tons and you are braking a 6’ long piece of material, how much tons/foot of braking power would you need?

A

120 divided by 6 = 20 tons

31
Q

What is the opening height?

A

The distance between the lower surface of the top beam and the upper surface of the bottom beam when the movable beam is at its maximum stroke length with no dies in place.

32
Q

What is the overall length?

A

The overall distance from the left side to the right side of the braking tool.

33
Q

What is throat depth?

A

This is the distance of the cut-out in the side frame machine housing that determines the maximum length of flange.

34
Q

What is the distance between housing?

A

The distance between the side frames of the brake allowing for free passage of material between frames.

35
Q

What is coining/bottom bending?

A

A method of bending where the material is expected to take its shape from the forming punch.

36
Q

What is air bending?

A

The method of bending where the material is expected to take its shape from the amount of depth penetration of the punch.

37
Q

What is bend allowance?

A

The amount of compensation considered for the stretch of the material at the bending point.

38
Q

When using inside dimensions add ___ of the thickness of the metal you are working with on each side of the bend lines.

A

20 percent (0.2)

39
Q

When using outside dimensions subtract ___ of the thickness of the metal you are working with on each side of the bend lines.

A

80 percent (0.8)

40
Q

On a power brake the upper bending tool is known as a?

A

Punch

41
Q

On a power brake the lower bending tool is known as a?

A

Die

42
Q

Which punch is very useful when performing channels or deep boxes?

A

Gooseneck punch

43
Q

What die is the lower tool the punch uses to form bend angles?

A

Lower die

44
Q

What die incorporates a special combination allowing for the production of bends by performing a sharp bend and then flattening it on the second operation?

A

Hemming die

45
Q

What are the 3 basic methods of bending that are used in forming sheet metal?

A

Coining, bottom bending, and air bending

46
Q

Which bending method offers the most accuracy but requires the highest amount of pressure?

A

Coining

47
Q

Which bending method is used in medium to high production and is excellent for producing sharp corners with consistent accuracy?

A

Bottom bending

48
Q

Which bending method offers less accuracy but requires the least tonnage?

A

Air bending

49
Q

What is the surest and most accurate methods to determine bend allowance?

A

Make a trial bend of the metal being used

50
Q

When materials are thicker than 1/2”, the V-die opening should be ___ times the thickness of the material.

A

10 times

51
Q

Which die eliminates scuffing?

A

Rotator die

52
Q

What counteracts spring-back?

A

Coining

Custom Metal Fabrication (4 decks)

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