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24 Cards in this Set
- Front
- Back
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Abbreviations and symbols
BC BCD BDC CL Cir D,Dia, ID O/C OD PL R or Rad TDC Typ |
BC - bolt centre BCD - bolt circle diameter BDC - bottom dead centre CL - centerline Cir - circumference D,Dia, - diameter ID - inside diameter O/C - on centre OD - outside diameter PL - plate R or Rad - radius TDC - top dead centre Typ - typical |
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What does a bevel protractor do? |
To check or lay out angles from 0 to 180° |
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1)What does a divider do? 2) when are they used? 3) When is a divider advantageous? |
1) Dividers transfer measurements 2) used in scribing arcs and circles in layout work
3) When the same measurement is repeated many times
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What is a trammel? What is it's purpose? |
Used to transcribe arcs and circles transfer measurements that are beyond the range of dividers |
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What are contour markers used for? What are they good for?
Which surfaces can they be used on? |
Used for pipe and structural layouts
cut lines for any angle
They can be used on pipe as they have a cupped surface. They can be used on structural shapes as they have an L shape side |
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What are stamps?
What is a low stress stamp? |
Provide permanent marking of heat numbers, job numbers, serial numbers, part numbers and other important information series of rounded bumps to minimize stresses and reduces notch effect on critical applications |
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What are the factors that determine the material markup process? |
*Material type
Thickness
Size of object and level of accuracy required
* permanent or temporary marking
Fabrication preparation. Flame cut, sheared, rolled or subjected to breaking operations
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What are the three flame cutting? Markups? |
Single line layout, usually accompanied by stylized s to denote scrap side of the cut
Double line layout - when you cut several adjoining pieces from one sheet, it provides clearance for any cuts between pieces
Double line layout with center punch marks - used when cutting heavily scaled, painted or coated surfaces. |
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When do you use layout dye? Which tool do you use along with dye? |
Went a high degree of accuracy is necessary A Scriber and divider |
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When marking up line layouts for shearing, what type of line do you use? What type of markups Do you use? |
Single line layout
Center punched and highlighted with crayon or paint |
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What tool can you use for alignment purposes or for match marking? |
A center punch |
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What are the advantages of templates? |
Improve accuracy
Reduce labor and time spent on layout work Better nesting of components, especially when cutting small or outshaped pieces |
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What's are the three general categories of templates? |
Layout templates - used to mock lines for cutting, bending, shearing, breaking operations, or to mark holes for drilling or punching Checking templates - check for the amount of forming during rolling, bending and braking operations Guiding templates - act as a guide for cutting, punching and drilling operations |
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What are checking templates? How are they used? |
Represent the shape, or a portion of the shape, of the objects final form They match the curvature of the object when finished. This allows a comparison when braking or rolling. |
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What are guiding templates? |
Guiding templates for magnetic trace, cutting machines and electric eye-guided cutting machines. |
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What materials can templates be made from? |
Heavy paper - pipe Cardboard -temporary - sweep template Fiber gasket material - permanent - pipe Sheet aluminum - pipe Wood - sweep template Plastic - sweep template Steel - magnetic trace cutting templates |
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What is nesting? |
Maximize materials, lay out work on material can include parts for other projects that can fit into any remaining space. Suits it for CNC cutting operations |
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How is pipe specified?
How is pipe different from tube? Which significant factor remains the same for pipe size? |
Diameter, wall thickness, length
Tube is generally available in smaller sizes and has a thinner wall than pipe. It is also specified by its outer diameter and wall thickness Outside diameter |
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What is the imperial system measurement for pipe?
How does categorization differ for 12' and smaller pipe in NPS and 14" and larger pipe? |
Nominal pipe size Pipe size is equal to the OD for 14-in pipe and larger, but not for 12-in and under |
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How is pipe referred to in the metric system? |
It's actual OD wall thickness in millimeters Aka dimensional nominal pipe size DN |
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What are the three pipe wall thicknesses? |
Standard - sch 40 Extra strong - sch 80 Double extra strong - |
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What is a wraparound?
What's are some important procedures. |
Useful for making square or angled lines around a pipe.
Wrap it around twice. Went marking pipe at an angle, the wrap round should be aligned to at least three reference points.
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What is the center head? Aka flange wizard |
To mark reference points on a pipe at any angle up to 90° on either side of top dead center. |
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Mark a template with pertinent information such as |
Intended purpose Type of material it is to be used on Process Job type Job number Part number |
