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Millwright Third Year 2018 > Leveling and Bore Alignment > Flashcards

Leveling and Bore Alignment Flashcards

1
Q

Define flat

A

To be put in the same plane, but not level. It is on on incline on the same plane

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2
Q

Define plumb

A

To plumb is to align perpendicular to horizontal. A plumb bob can be used but becomes inaccurate in even the slightest of breeze

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3
Q

Define level

A

To put into same plane as the horizon

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4
Q

Define straight

A

To be in direct line of Eg. Several different components of a lathe all have different OD, but are straight with the centreline

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5
Q

Define square

A

Square refers to something that is aligned 90° to a reference line

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6
Q

What are some advantages of optical lines of sight

A

It does not sag because there is no weight involved, they cannot be kinked, it does not vibrate, there is no tripping hazard, it remains straight for long-distances,can measure accurately to within thousands of an inch over long distances

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7
Q

What can happen to optical rays through a change in temperature?

A

They can become distorted, like looking through heat sources

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8
Q

What is refracting?

A

The line of sight bends and gives false readings

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9
Q

How does line of sight differ when looking through different materials

A

Light bends differently through different materials

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10
Q

What is diffraction?

A

When you shoot too close to the edge of an opening or through too small of a hole it can bend the line of sight

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11
Q

Why can vibration be a source of error?

A

Vibration can travel through the stand and cause the target To blur

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12
Q

What is the difference between angle of incidence and angle of reflection

A

The angle of incidence is the one which you were looking at, and the angle of reflection is the image that is reflected off a polished surface or mirror

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13
Q

When looking through a medium the The light is always refracted toward or away from the normal. what does normal refer to?

A

Normal is a line perpendicular to where the two surfaces meet

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14
Q

When light rays look through tilted glass plate what happens

A

The light rays are displaced but always remain parallel

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15
Q

What is the difference between a convex lens and a concave lens

A

The convex lens focuses light to a single point, in the concave lens disperses light in all directions

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16
Q

What is the purpose of the eyepiece

A

It flips the image back from upside down

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17
Q

What is the purpose of the objective lens

A

It is located near the front end and directs the light rays of the object being sighted into the focus lens

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18
Q

What is a prism

A

A prism has a glass body with three or more optically flat surfaces that are not parallel. Prisms control the direction of light rays through refraction and reflectio

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19
Q

What is a penta prism

A

It is a five sided prism that has a special use an optical tooling and as the basis for the optical Square. No matter how you look through it the image is 90°

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20
Q

When you hear “auto” what should you think?

A

Mirror

21
Q

When you hear “collimation” what should you think?

A

Light

22
Q

What is auto reflection?

A

A mirror placed perpendicular to the eyes line of sight, gives you an exact reflection of yourself

23
Q

What is auto collimation

A

It is similar to auto reflection, but it is more accurate because the line of sight of the telescope is aimed at the reflected image of the crosshairs of the telescope itself

24
Q

Which is the most accurate out of collimation, auto-collimation auto reflection

A

Auto collimation

25
Q

What is collimation?

A

The light source projects crosshairs of one telescope onto the crosshairs of another telescope

26
Q

What is a collimeter?

A

There is no eyepiece It is used to align with a telescope and read off a collimeter reticle

27
Q

What is an optical micrometer?

A

It is used for precision levelling, and is accurate to within .001” It can be an attachment or a self contained optical tool

28
Q

What is s coincidence striding level?

A

It is used on an alignment telescope or collimator to establish the tool in a level position

29
Q

How accurate is a coincidence striding level?

A

Accurate to within one arc second

30
Q

What is an optical square?

A

It mounts to the end of a telescope, and is used to establish a plane perpendicular to the reference line of sight. The penta prism is the basis for the optical square

31
Q

What is a lateral adjuster

A

They are similar to the crossfeed on a lathe. They are used for bucking in targets

32
Q

What is the most accurate instrument for a straight line of sight?

A

An alignment telescope

33
Q

What is the purpose of an alignment telescope?

A

They are used to see a reference line only. Using special attachments they can establish a vertical reference line or a perpendicular reference line

34
Q

Why is the alignment telescope so accurate?

A

Because it has a built-in optical micrometer

35
Q

What is a tilting level?

A

They are used to establish a level plane and are you strictly for leveling procedures

36
Q

What is a tip in regards to accuracy of the tilting level?

A

To maintain accuracy the tool must be kept equal distance from the backsight and the foresight

37
Q

What is the backsight?

A

It is also known as the benchmark. It is the one that you reference all other measurements from

38
Q

When levelling a fish eye level what is the rule?

A

The bubble will move in the direction of the thumb on the left hand. It will move towards any clockwise direction rotation

39
Q

What must be done before every shot

A

The coincidence level must be re-leveled every shot

40
Q

When shooting with an optical level or jig transit what is the highest elevation?

A

The lowest number is the highest elevation

41
Q

What is bucking in

A

Getting two targets in line

42
Q

Describe the procedure of bucking in

A
  1. Rotate to sight of far target
  2. Move laterally to near target
  3. Rotate to sight of far target Continue repeating until both objects are in line
43
Q

I was the accuracy of a jig transit or theodolite checked?

A

Using a plumbob immersed in a bucket of oil

44
Q

What is the procedure for using a jig transit to establish a straight line of sight?

A
  1. Establish straight line of sight to one target

2. Transit the line of sight to other targets in a vertical plane

45
Q

What is a theodolite?

A

A theodolite can be used to measure angles in a horizontal and vertical plane It measures-horizontal and vertical angles, horizontal planes, inclines, vertical heights

46
Q

What is a theodolite usually equipped with?

A

And optical plumbob make me a easy to set up accurately over a set point

47
Q

If a wire alignment is done properly how accurate can it be?

A

They can be accurate as close as .0001

48
Q

What two things are needed to determine which sag chart to use

A

The wire thickness and the weight amount

49
Q

What are laser glasses (laser awareness glasses)

A

They help improve the visibility of the laser dot, they do not protect the eyes at all from the laser

Millwright Third Year 2018 (15 decks)

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