line C-2 use portable power tools Flashcards
at what speed does the fastener move in low- velocity
under 100m/s
what component does a low- velocity tool have that is not found in high - velocity tool
piston
name 3 safety features of the low velocity powdered actuated tool
must be within 7 degrees
2 actions needed before it can fire
captive piston
when the powder actuated tool is fired , the piston travels down the barrel to strike the fastener like a hammer , what is the type of propulsion called ?
impact
what is the method of contact propulsion ?
the piston is in contact with the fastener which in turn is in contact with the work surface
what kind of propulsion is it called when the piston and the fastener are not in contact with the work surface
co-acting
what is medium velocity and its speed
when fired , the fastening pin travels 100-150 meters per second
what is low velocity and its speed
a powder actuated tool that contains a captive piston , less than 100meters per second
what is high velocity and its speeds
they have no pistons and the fastening pin is discharged at a higher velocity greater then 150 meters per second …. speeds of 460 meters per second is not unusual
for brass case ( low-velocity) what is the order from strongest to weakest in color and number
grey 1
brown 2
green 3
yellow 4
red 5 ( most common)
purple 6
for nickel case ( high-velocity) what is the weakest to strongest from color and number
grey 7
brown8
green 9
yellow10
red 11
purple 12
What are the 2 different types of cartridges and the way the are fired
crippled and wadded
center fire and rim fire
what are 3 types of fasteners for powder actuated tools
threaded , headed and eyelet
when designing fasteners what are the 3 rules manufactures must follow ?
the piston must match the fastener
the fastener washer guide must fit snuggly in the barrel
the proper cartridge must be used
when selecting fasteners consider the following what ?
the type of material to be penetrated and the amount of penetration required
why would you use additional washers
to prevent shearing of soft material on steel , concrete
what are 3 examples of requirements for fastening to concrete or concrete block
concrete cannot be less then 3’’ (75mm) thick
fastening must be 3’‘(75mm) away from edge of concrete
do not fasten into horizontal or vertical mortar joints of concrete
fastenings should be spaced no closer than 3’’ ( 75mm)
what are 2 situations to avoid when using a powder actuated tool
do not fasten into spalled areas
do not fasten into pre cast concrete beams or slabs containing pre stressed cables
what are 3 things to consider when using a powder actuated tool into steel
-fastners must be at least 13mm(1/2’’) away from edge of steel
- fasteners should be installed at least 25mm(1’’) apart
- steel must be at least 5mm (1/4’’) thick
what are 4 basic types of chainsaws
gasoline powered
electric
battery powered
pneumatic
what are common chainsaw hazards
kickback
chain cuts
noise
vibration
exhaust fumes
chain breaks
what dcbs do chainsaws cut at
90 and 120
what are 3 cutting techniques for chain saws
top cut
under cut
plunge cut
before you start cutting with a chainsaw what should you consider and check for
for cracks
loose bolts
excessive wear
what are common uses of a chainsaw in construction
timber framing
demolition
cutting rough openings
what do chainsaws emit the most
carbon monoxide
name 2 safety devices that help prevent injuries resulting from chain breaks
rear hand guard
chain catcher
what is the only accepted method of starting a chainsaw
with the saw on the ground
what is the easiest and safest cut
top cut
when undercutting the natural tendency of the saw is to
push away from the wood
which cut is the hardest and most dangerous
plunge cut
to properly adjust the chain tension the guide bar must be ?
slightly slack
what are hammer drills capable of drilling , think diameter
20mm or ( 3/4’’)
what is the difference between a hammer drill and a rotary hammer drill
the action is delivered by a piston like device and delivers a blow about 10x harder than a hammer drill
what diameter can rotary hammer drills get to
50mm ( 2’’)
what are demo hammers sometime referred to as ?
breakers or jack hammers
what are 3 types of cut off saws
handheld
benchtop
walk behind
what are most handheld saws powered by ?
gasoline
what are common uses of a handheld cut off saw
control joints
cutting concrete
asphalt
what are benchtop cut off saws commonly referred to as ?
chop saws
what are some of the uses of a walk behind cut off saw
cutting concrete or asphalt
can walk behind cut off saw cut as deep as 8’’ ?
yes
what are the 2 types of blades used for cut off saws
abrasive disks and superabrasive blades
what are the sizes for many handheld and metal cutting saws
14’’ or 16’’
describe the two difference between abrasive and superabrasive
abrasive is made up of composite material
super abrasive is made of diamond impregnated , cubic doron
name 2 types ferrous metals
steel and iron
what are 3 types of metals grinding / cutting disks use with angle grinders
ferrous metals
non- ferrous metal wheels
cut off wheels
what do the following contain ferrous metals , non-ferrous metals , cut off wheels
ferrous - cast iron , steel
non-ferrous- brass copper aluminum
cut off wheels - zip disks
what does the rpm of router run at commonly
20-30,000 rpm
what are the 2 types of routers a there is a 3rd what is it
standard and plunge router laminate trimmer
what are the 2 factors the determine the size of a router
the horsepower of the motor and the max shank diameter of the bit
what is a collet
is a tapered metal piece that is split
what are 6 types of router bits
chamfer
dove tail
flush cut
laminate
ogee
cove
how often should the brushes be checked
every 50 hrs
how does a collet work
compresses on bit
how do you measure the cutting depth of a bit
distance between cutting edge to outside of bearing
what type of sander is used for sanding the edge of a wood floor
disk sander
what type of sander is used to fit a preformed countertop
belt sander
list 5 types of sanders
disk
belt
orbital
random orbital
oscillating
what motion should be used with the belt sander
oval with the grain
what is the main advantage of a orbital sander
No specialty paper is needed , uses 1/4 or 1/2 sheets of standard 9’‘x11’’ sand paper
how many different grits of sandpaper are usually required for finishing
3
course, medium, final
what are 3 toxic sanding dusts
yew , redwood, cedar
how deep should the cut be when planing a board that is the full width of the plane blade
shallow cuts
what is the position of the cutting knife in relation to the planes shoe
cutting knife should just touch straight edge when it rests evenly on rear base/ outfeed
describe how to plane wood with mixed grain
shallow cuts
how wide to handheld power planes get to
3 1/4
what fastening system is a biscuit joint similar to
dowel
when edge joining where should the biscuit be located
slightly off center
What should be done to determine if the material is suitable for a powder actuated tool
Do a test with a fastener to be used fastener as a centre punch
How far must you stay away from a torch or weld when using a powder actuated tool
50mm
Which tools use a 2”-6” coring bit
Rotary hammer drills
What’s the main difference between abrasive and super abrasive blades
Super abrasive creates less dust
Which stationary power tool is a portable power planer similar to
A Jointer
When installing sharpening knives what is considered correct
The depth adjustment must be at zero
How can you adjust the depth of a cut for different size biscuits when using a biscuit jointer
Depth adjustment knob
