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Red Seal Study Prep > Belts > Flashcards

Belts Flashcards

1
Q

When reading stadia lines how do you figure out the distance?

A

Upper stadia - lower stadia / 100

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2
Q

What are the thread classes and which fit class requires the most torque

1/2 - 12 UNC -3A LH

A

1/2 major diameter
12 threads per inch
UNC - thread class
3 tolerance class (class of fit)
- 1 loose 2 standard 3 close
A - thread type
A is external B is internal

3 close for requires the most torque

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3
Q

When drilling brass how do you stop the drill bit from catching

A

File or hone rake angle to 0

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4
Q

What are _______ for
Snub pulley’s
Take up pulleys
Bend pulleys
Idler pulleys
Troughing pulley

A

Increase arc contact
Increase belt tension
Change direction of belt travel
Support the belt on the unloaded side
Generate trough shape

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5
Q

The ability for grease to resist deformation stiffness

A

Consistency

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6
Q

Bearing codes

A
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7
Q

When calculating safe working load the formula is? And if you have two different slings lengths which one do you use for the calculation and why?

A

Use the shortest sling because it will give you the smallest swl
H=vertical distance from load to shackle
L = length of sling

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8
Q

Why is oil applied to the slack side of a chain?

A

When the chain is slack it will allow oil to get in between the plate

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9
Q

What do you risk if the hourly volume is exceeded when using acetylene?

A

Acetone may begin to be expelled from the cylinder

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10
Q

How is chain pitch designated

Al1022

A

First 2 numbers in 1/8th

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11
Q

Where does the v belt ride in the sheave?

A

Sides of the belt

Gets its grip from the wedging action
Must not ride at the bottom of sheave

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12
Q

When do you adjust variable speed belts?

A

Always adjust when machine is running

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13
Q

What is a disadvantage of an open ended belt

A

Can only carry 1/3 of the load

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14
Q

Why is preliminary clean up important for v belts?

A

Dirt and deposits degrade belts and create an imbalance which prematurely wears out equipment

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15
Q

Why is it important to clean and inspect sheaves?

A

Check for cracks especially around the hub.

Build up of deposits can cause vibrations

Inside of groove is what grips belt must be free of contamination

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16
Q

What two ways can you check sheave grooves?

A

Sheave groove gauge

New belt in sheave groove

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17
Q

Cause of belt swell, soft and bottom seam starts to open up?

A

Excessive exposure to oil

18
Q

Cut bottom or sidewall of belt?

A

Pried over with screw driver or damaged during install

Make sure tension is loose enough before forcing the belt on

19
Q

Belt turnover?

A

Belt misaligned
Worn sheeves
Excessive vibration

20
Q

Spin or burned belts

A

Insufficient tension

Contact with obstruction

21
Q

Ply separation in a belt

A

Excessive tension

Substantial drives

22
Q

Excessive belt stretch

A

Improper matching
Mixed old belts with new belts
Non-parallel shafts
Different manufacturers
Belt/pulley incomparable

23
Q

Hardening and pre mature belt cracking

A

High ambient temperature

24
Q

What defects are corrected by changing worn sheeves?

A

Uneven envelope wear
Ply separation
Belt turnover
Excessive stretch
Mismatched belts at installation
Cut through on top (joined belts)

25
Q

What problems are resolved by proper tension?

A

Spine or burn
Envelope wear
Belt squeal
Excessive stretch
Excessive vibration

26
Q

What symptoms call for replacing belts

A

Weathering or case cracks
Envelope wear
Excessive vibration
Mismatched belts at installation

27
Q

What is most important about a belt tensioning system?

A

Must be reliable in holding the belt to specific tension and holding the drive in alignment

28
Q

When installing a new belt how much do you loosen the take up?

A

Enough so that you don’t have to pry the belts and they do not roll over upon assembly.

29
Q

Fitting new belts involves?

A

Aligning the sheaves and tensioning the belt

30
Q

Before installing new belts and/or sheaves you must:

A
  • check for worn bearings by bumping, pushing, and pulling the shaft
  • check axial movement in the shaft by setting a dial indicator on the end.
    -check shaft for runout
    -if bearings and shaft runout are good. Rough align by placing straight edge over the two sheeves and shim accordingly
31
Q

Maximum belt misalignment per foot is

A

1/16 “

32
Q

Once sheaves are mounted on the taper what do you check for?

A

Axial runout (wobble)

Place indicator reading of the face of the sheave

33
Q

When using taper bushings what can cause runout on sheaves?

A

Improper tightening of the taper bolts

34
Q

To tension individual belts what do you use?

A

Belt deflection gauge and deflection table.

Tension belt until you get a deflection equal to the value on the deflection table.

35
Q

How do you check tension on a banded v belts?

A

Us a special deflection gauge that spans the width of the belt

36
Q

When should you not used idlers?

A

Reversing drives

37
Q

What are some signs of to much tension on a new belt?

A

Bearings running hotter

Higher amperage draws from motor

38
Q

What are signs of not enough tension

A

Squealing sounds
Smell of burning belts

39
Q

What are signs of misalignment

A

Flapping belts on the tension side

Excessive vibration could be sign of misalignment or run out

40
Q

Repeat start up check after how many hours of running after new belts have been installed?

A

Every 8 hours for the first 24 hours

41
Q

Chirps indicate

A

Dirt or dust in the sheave grooves or on the sides of the belt

42
Q

If operating conditions for belts is above 60 degrees c what should you do?

A

Use heat treated belts

Red Seal Study Prep (5 decks)

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