PRINCIPLES OF FABRICATIONS EXAM 1

the three views necessary to describe most objects in orthographic drawings are:

front, top, and end

T/F: the architect’s scale is used in drawing curves for ellipses and circles

false

a 2-d, head on view of each side of an object is also known as ? projection

orthographic

T/F: the nominal size of lumber is smaller than the actual size

false

a ? line is used to show visible edges of a drawing

object

which of the following types of technical drawings are needed for most shop work?

orthographic and pictorial

a dashed line, showing edges that cannot be seen from a particular view on a drawing is known as a ? line

hidden

a 45 degree triangle would be most useful in drawing the axis indicating depth in which of the following types of drawings

oblique

T/F: the main difference between drawings and sketches is that drawings represent the shapes and sizes of objects, while sketches do not

false

in a drawing of a wooden object, nominal sizes of lumber should not be used

false

why is it important for the shop worker to read plans?

more effective communication, can develop bills, reduce waste

T/F: an extension line is used to indicate length

false

what is the rim speed of a 7.6 inch grinding wheel that is turning at 1740 rpm

3460

the eye protector on a bench grinder eliminated the need for safety glasses

false

which of the following is not a synthetic abrasive

emery

which of the following types of bond would most likely be used on a cutoff wheel

rubber

T/F: when operating a bench grinder, it is sometimes okay to remove your gloves, especially if they get in the way

true

what is the rim speed of a 6.2 inch grinding wheel that is turning at 1788 rpm?

2901

T/F: the cutting edge of a tool is ground to a convex, concave, or straight edge, depending on what type of metal you are using

false

what is the term that describes the hardness of a grinding wheel

grade

what grit would most likely be used for sharpening fine edge tools

100 grit

T/F: the finer the grit size, the higher the number

true

T/F: the eye shield on a grinder should be positioned 1/8” from the grinding wheel

false

what is the least hard abrasive

flint

T/F: natural abrasives are used much more commonly than artificial abrasives for grinding wheels

false

T/F: the nut on the arbor of a bench grinder is loosened in the direction of rotation when changing wheels

false

T/F: one of the reasons that you want to cool tools frequently when grinding is so that the metal does not lose its temper

true

what edge has the most backing material

convex

T/F: in addition to re-establishing a straight edge and improving the balance of a grinding wheel, dressing the wheel can also be done to remove glaze from it

true

which of the following bond types would most likely be used for binding diamond abrasive to a cutoff wheel

metal

T/F: some different types of grit include vitrified, silicate, and resinoid

false

which of the following bond types would most likely be used on the type of wheel used on an angle grinder

resinoid

is A or Z a harder grinding wheel grade

Z

what would result in the drill bit spinning in place, without making any cut at all

clearance angle too small

in sharpening a wood chisel, how many times the thickness of the blade should the length of the bevel be

2x

T/F: sharpening a pocket knife on a bench grinder or pedestal grinder is a sustainable practice

false

T/F: if a burr develops when sharpening a tool with a single cutting edge, the best practice is to turn the tool over and grind lightly on the flat side of the cutting edge to remove the burr

false

what would most likely lead to the cutting lips on a drill bit breaking off

clearance angle too large

T/F: when re-tooling a wood chisel or plane iron, the best practice is to sharpen both sides of the cutting edge

false

what happens if the bevel of a wood chisel is too long

the chisel may be used to cut soft wood, though it will likely nick or dull easily

for sharpening which type of cutting edge would be used in an up and down motion

convex and straight

T/F: steeling a knife blade does not actually sharpen it; there are generally no abrasives involved. It simply straightens the blade edge between uses and sharpening

true

when sharpening a wood chisel on a grinding wheel. the best procedure is

use only a side by side motion to obtain a bevel that is approximately twice the length of the thickness of the chisel

when only using a side to side motion on a grinding wheel to sharpen a cutting edge, which of the following types of cutting edges will result?

concave

which of the following metals is most brittle (tungsten, steel, copper, aluminum)

aluminum

which of the following metals is most ductile (tungsten, steel, copper)

copper

which of the following materials would be the hardest (aluminum, copper, steel)

steel

T/F: alloy steels are much more commonly used than carbon steels because they can be customized to different applications

false

what are the effects of adding carbon to steel

increase wear resistance, decreased malleability and ductility, increases hardness

tensile strength

resistance to stretching forces

shear strength

resistance to eccentric forces

impact strength

resistance to shock

according to its space lattice, what metal is most similar to lead

nickel

what has the most to do with a metal’s corrosion resistance

its chemical properties

hardness

resistance to deformation

brittleness

likeliness to break when subjected to pressure

ductility

ease at which a material can e drawn out of hammered thin

strength

power to resist strain or stress

what would be the best additive to steel in the manufacturing of drill bits

carbon

if you wanted a standard box wrench, what would you need to do first?

alleal

compressive strength

resistance to squeezing forces

fatigue strength

resistance to yield from repeated loads

flexure strength

resistance to yield from a single load

under what classification would monel fall

non-ferrous alloy

iron, chromium, and carbon make up what

chromium steel

a steel given the SAE classification of 1018 would be described as

carbon steel, no main alloy element other than carbon, .18% carbon

under which classification would pewter fall

non-ferrous alloy

what metal if hard, brittle, and used to make wrought iron or steel

pig iron

what iron is brittle, corrosion resistant and used for galvanizing steel

zinc

what classification would low carbon steel fall

ferrous metal

what metal is strong, hard, elastic, tough, durable, corrosion resistant, and used in manufacturing of tool steel, springs, cables, axles, shafts, and armor plates

nickel steel

under what classification would chromium fall

non-ferrous metal

magnesium, aluminum, and manganese make up which of the following

dowmetal

iron, nickel, chromium, and carbon make up what metal

stainless steel

under what classification would copper fall

non-ferrous metal

under what classification would pewter fall

non-ferrous alloy

what metal is brittle, corrosion resistance, and commonly used in the manufacturing of sprockets, stoves, manifolds, and engine blocks

cast iron

what metal is hard, brittle, and used to make wrought iron or steel

pig iron

under what classification would monel fall

non-ferrous alloy

under what classification would pig iron fall

ferrous metal

what metal is rust, scratch, and stain resistant and also used in the manufacturing of bearings, safes, and ore crushers

chromium steel

under what classification would dowmetal fall

non-ferrous alloy

under what classification would aluminum fall

non-ferrous metal

copper and tin make up what

bronze

what is the thread pitch of a ¼'“ NF bolt?

28

which screw has a pitch of 13 threads per inch

½” NC

what file shape would be most useful in removing material from square inside corners

triangle

T/F: the degree coarseness is greatest in longer files

true

what has the coarser thread, ½”-13 or ½”-20

½”-13

you have a full set of NC and NF taps, but only one drill bit handy (a letter U bit). What size threads will you end up tapping

7/16” NC

T/F: a claw hammer should be used to strike a center punch when marking the center of a hole

false

“pitch for hack saw refers to

distance between teeth

what size drill should be used when tapping ½”coarse threads

27/64”

T/F: a ball peen hammer should be used to strike a scratch awl when marking the center of a hole

false

what isa composite of two different structures: one containing very little carbon, and one containing up to 6.7% carbon

pearlite

what is formed when steel is heated to cherry red

austenite

T/F: to harden steel you must light to cherry red and then let cool slowly

false

T/F: when you upset metal, you actual shorten it

true

T/F: an anvil is a major component in Hot Metalwork

true

what are the steps involved in heat treatment

hardening, tempering, annealing