Layout Flashcards
Lay out angled from 0 to 180 degrees
With the centre head attachment can also be used on pipe or cylinders
Bevel protractor
Small arc and circles
Transfer small measurements
To draw a circle set to any radius
Divider/ compass
Large arcs and circles
Transferring large measurements
Can be attached to any steel or wooden bar
Trammel points
Has an articulating arm to scribe along any contour
Contour markers
Used for fine detail
High degree of accuracy
Layout dye
Mark up for alignment
Use punch marks to mark the material if good fit up is achieved but you must move the piece to continue to work on it.
What tool is good to mark heavily scaled plate to be cut
Centre punch
Used to check the id of rolled plate
Sweeps
What is the best template material to use to mark circles on pipe
Gasket material
….. is measured by OD only
Tube
What is the last size of pipe that is measured in NPS
12
What is the best way to divide a pipe in quarters
Fold a paper in half twice
What is the centre finder mainly used to find
TDC
NPS
Nominal pipe size
Directly related to wall thickness and will determine how much pressure that a pipe can handle
Schedule
L shape (angle iron)
Can be used as a straight edge on pipe
For marking reference points 0 - 180 degrees opposite each other
Centre finder
When does pipe begin to be measured in OD
14
How many wraps of a wraparound is recommended to ensure alignment
2
Templates
Benefits of
Improve accuracy
Reduce labour and time spent on layout work
Provide better nesting of components
AIT
What is this template
Middle piece of a multiple piece elbow slot on exaughsts (mitre)
Provides TDC (top dead center) pin acts as a centre punch
Centre head
Two common uses for dividers/ compass
Scribe smaller circles and arcs
Accurately transfer repeated measurements
Two uses for trammels
Scribe larger circles and arcs
To accurately transfer repeated measurements
What layout tool is specially designed for developing cut lines at any given angle on pipe and structural shapes
A contour marker
The divisions marked on a protractor head measure
Degrees
The most accurate method of placing repeated measurements on a piece of steel plate is to use a
A set of dividers
List two markers that are preferred for accuracy when marking steel
Scribers
Soap stone
Permanent layout marks are made using
A centre punch
Centre punch marks on a cut line are used to
Act as a guide for improved cutting accuracy
Three general template categories
Layout templates
Checking templates
Guiding templates
Two materials suitable for temporary templates
Gasket paper
Cardboard
Three materials that may be used for permanent templates
Metal
Wood
Plastic
Templates marked with quadrant lines are most likely used when working with
Pipe
Define
Nominal pipe size
Piping by name only. Nominal pipe size is NOT equal to outside diameter for pipe 12” and smaller, but is equal to the OD for pipe 14” and larger
What factor determines the nominal pipe size for 12” and smaller pipe
And
14” and larger pipe
12” - the inside diameter of standard pipe
14” - the outside diameter
What significant factor remains the same for any size pipe
The outside diameter
Explain the difference between sched 40 pipe and standard wall pipe
Each size of sched 40 pipe has a dif wall thickness whereas standard pipe 10” and over has a wall thickness of 3/8
When dealing with pipe what does the term sched number mean
The strength of pipe with reference to its wall thickness
In the metric system what unit of measure is used for pipe wall thickness
Millimeters
Two tools that are handy for custom layout of mitre lines on pipe are a ________ and a ________
Contour marker
Wraparound
Consists of a series of rounded bumps
Min stress and reduces notch effect
Low stress stamps
Neither to large or complicated, usually 45 degrees
Oblique drawing
3 types of templates
Layout template - mark lines for cutting , bending shearing or braking
Checking templates - check amount of forming, rolling and braking operations
Guiding templates - punch and drilling
Used to check the ID of rolled plate
Sweeps
Temporary template material
Paper and cardboard
Wear resistant template material
Gasket, plastic or metal
The last size of pipe that is measured in NPS
12”
Original 3 thicknesses with pipe are
Standard
Extra strong
Double extra strong
True or false
Standard and sched 40 have the same wall thickness through 10”
True
True of false
XS and sched 80 have the same wall thickness through 8”
True
True or false
Nominal pipe size is not equal to the outside diameter for 12” and smaller but equal to OD for 14” pipe and larger
True
True or false
Standard pipe 10” and larger has a 3/8” wall thickness
Extra strong pipe 8” and larger has a 1/2” wall thickness
True
Tools needed for isometric drawings (2)
Tee square and set square 30 - 60 - 90
Oblique drawings are usually 45 degrees true or false
True
Unidirectional (dimensions on blue prints)
One direction
Aligned (dimensions on blueprints)
Will line up with whatever side it is on. Vertical and horizontal.
Find the bolt hole angle
360 degrees divide by number of holes
Schedules of wall thickness uses a numbering system in divisions of ten: 10, 20, 30, 40, 50….
True or false
True
Schedule is more variety and doesn’t have to be as thick, directly related to how much pressure that pipe can handle
True or false
True
