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M7 > 7.6 > Flashcards

7.6 Flashcards

1
Q

What size is biggest and smallest drill diameter?

A

Z biggest
A smallest

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2
Q

What are the 3 types of fit?

A

Clearance
Interference
Transition

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3
Q

How many classifications do ISO provide?

A

28

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4
Q

What are the 2 grades of bilateral holes?

A

A and B

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5
Q

What is the difference to class A and B?

A

Class A is more Accurate than class B

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6
Q

What are the 2 grades of press fit?

A

F and D

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7
Q

What’s the class of transition fit?

A

P

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8
Q

What are the 3 class of clearance fit?

A

Z, Y and X

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9
Q

What is the remark for interference (F) fittings?

A

Mechanical pressure

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10
Q

What is a remark for Driving (D) fittings?

A

Less tight than force fit one part can be driven into another

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11
Q

What is a remark for push (P) fittings?

A

Suitable for detachable parts but not moving

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12
Q

What is a remark for clearance/Running (X, Y Z) fittings?
What is special about Z

A

Suitable for moving Parts
Z is finest

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13
Q

What is deviation?

A

Difference between a size and corresponding size

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14
Q

What is FIt?

A

Mating shaft and hole

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15
Q

What is clearance?
And what does it allow

A

Shaft smaller than hole allows for movement

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16
Q

If a parts clearance becomes to large what are the 3 characteristics to look for to know its been worn?

A

Quality
Bow
Twist

17
Q

How do they Heat/Shrink parts to fit in different assembly’s?

A

Heat with heating element
Shrink with dry ice or liquid nitrogen

18
Q

What is a Press/Transition fitting?

A

Part is pressed into the assembly

19
Q

What is a clearance fitting?

A

Parts are slid into the dedicated slot

20
Q

When a shaft or tubes centre line is not straight what is it called?
And what can this cause when rotating at high speeds?

A

Bowing
Vibrations

21
Q

For an example a shaft that rotates at 1500 Rpm what is the limit of Bow allowed?

A

0.25mm or 10’ thou

22
Q

What is Wear?

A

Removal of material and deformation

23
Q

What is Dimension New in relation to Wear?

A

Size of part when its new to relevant tolerances

24
Q

What is Permissible Worn Dimension in relation to Wear?

A

Size which parts can wear before becoming unserviceable

25
Q

What is permissible worn clearance in relation to Wear?

A

Maximum allowable clearance in reassembly

26
Q

How do you check for ovality in holes and shafts?

A

GO/NO-GO Gauges

27
Q

What is used to check a rotating part for roundness and true clearance (thing they use to check crank shafts)?

A

Dial Test Indicator

M7 (14 decks)

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