Midterm Flashcards

1
Q

Screw pin anchor shackle

A

Bell handles 2 connections
Pin handles 1 connection

Size up 1 from rope, if 1/8 wire rope, use 3/16 or 1/4 shackle

CM uses 5/8 shackle

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2
Q

Yield point

A

When an object bends outside it’s elastic range

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3
Q

What if risk?

A

Increase design factor to reflect the risk

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4
Q

Synthetic

A

3 strand

Kernmantle- climbing ropes with sheath

Double braids - sta-set braided rope covered with another braided rope

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5
Q

Eye bolts

A

We want forged shoulder eye bolts

Eye bolts used for straight pull

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6
Q

Fatigue

A

Repeated applying and removing of force on an object

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7
Q

Bending (flexure)

A

One area of beam is in compression; another part is in tension

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8
Q

Ultimate strength

A

The unit stress (strain) just before an object breaks

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9
Q

Hitch

A

Implies securing it to something

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10
Q

3 natural ropes and how good

A

Hemp is hemp
Manila is good
Sisal is crap

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11
Q

Shock load

A

1 cause of accidents with moving things

Rapid application of force to an object

rapid acceleration or deceleration

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12
Q

Knots reduce strength by

A

As much as 50%

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13
Q

Strength reduction factor

A

Factors that will decrease the strength of the materials
Knots in a rope
Type of termination on a wire rope

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14
Q

Knot

A

1 rope

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15
Q

Ac cable

A

7x19

7 bundles of 19 wires

Plow steel

Thimbles support sides

Don’t crimp middle last

Never less than 2 clips

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16
Q

Forces (4)

A

Compression
Tension
Shear
Torsional

Rigging is generally compressive

17
Q

What is scope?

A

When you get a rigging assignment ask this.
What do we have to do?
When?
With who?

18
Q

Working load limit

A

A percentage of the ultimate breaking strength

Allowable load limit
Allowable working load
Recommended working load
Safe working load

We size hardware according to this

19
Q

Torsion

A

Twisting force

20
Q

What is rigging?

A
Hanging something from something
Scenery
Speakers
Truss
Lights
People
21
Q

New rope SWL

A

5:1 with new rope

Smaller the diameter the higher the safety factor

22
Q

Rope process

A

Organic fibers
Yarn
Strands

23
Q

Bend

A

Implies two ropes

24
Q

Trim chain

A

Grade 30 proof cool chain

25
Q

Breaking point

A

When material continues to stretch in a plastic state until it reaches the point of ultimate stress

26
Q

Plastic state

A

When object goes beyond yield point

27
Q

Bridle

A

Went two ropes are coming down to the same point, has a concurrent point of force

28
Q

Pair ring

A

Yup

29
Q

Design factor

A

Ratio of allowable load to ultimate breaking strength
Determined by dividing the ultimate breaking strength by the allowable load

We mitigate shock loads by this

30
Q

Strain

A

Change in length of an object as force is applied to it