C2 - Use Portable Tools LT #1 Powder-actuated tool Flashcards
What is the most widely used tool in the construction industry?
Low-Velocity
Speed of fastener and driving piston for Low Velocity?
Less than 100 meters per second
What is the function of a captive piston?
when a cartridge is fired, the force of the explosion acts first on the piston, which then acts on the fastener and drives it into the material
How fast does a fastening pin in a medium-velocity fastener travel?
100 to 150 m per seconds
Does a high velocity fastener have a piston?
No
What speeds does a fastening pin discharge in a high-velocity fastener?
150 m/s or even 460 m/s
Describe the impact method of propulsion
The gap between piston and fastener, tool is fired, piston travels down the barrel to strike the fastener like a hammer
Describe the contact method of propulsion (Fastener)
The piston is in contact with the fastener which is in turn contact with the work surface
Describe the co-acting method of propulsion (Fastener)
The piston and the fastener are not in contact with the work surface, the piston and fastener reach considerable speed before the fastener strikes the work surface, penetrating more deeply
When selecting a cartridge (fastener) which should you start with?
Start with the weakest, work your way up in strength until fastening begins to work properly
What is a threaded fastener for?
for bolting an object after a fastener has been driven
What is a headed fastener for?
For fastening an object directly to concrete or steel
What is an eye fastener for?
Holding wire attachments or other lightweight loads such as suspended ceilings
Describe holding action (holding ability of a fastener)
On penetration, the fastener displaces and compresses the material, the material then tries to return to its original form and that effort squeezes the fastener
What is acceptable in a center punch test?
If the fastener makes a distinct dint in the material, the material is acceptable for fastening
Fastening concrete and concrete blocks requires:
1) Minimum thickness of concrete into which a fastener can be set must be three times the penetration of the fastener, but at no time may the concrete be less than 75 mm (3”) thick
2) Fastening must be 75 mm from concrete edge
3) Fastening to a concrete block, fasten into the web, not the hollow
4) Do not fasten into horizontal block, fasten into the web
5) Fastenings must be sent only into the horizontal or vertical mortar joints
6) Fastenings should be spaced no closer than 75 mm (3”)
At what speed does the fastener move in a low-Velo, powder-actuated tool?
Less than 100 m / second
What component does a low-velocity tool have that is not found in a high-velocity tool?
A piston
Name three safety features of a low-value, powder-actuated tool.
1) Captive piston
2) tilt fire safety
3) requires 2 distinct action
4) has a built-in stopping mechanism
When this tool is fired, the piston travels down the barrel to strike the fastener like a hammer, name the type of propulsuion used.
Impact method
List the six load colors and power level numbers of cartridges with brass cases. Start with the weakest load and power level and proceed to the strongest
1 - Grey
2 - Brown
3 - green
4 - Yellow
5 - Red
6 - Purple
Cartridges are available in two metal types
Brass (low velocity)
Nickel (high velocity)
When selecting a cartridge for fastening with a low-velocity tool, what power level must you start with?
Weakest
When selecting a cartridge for fastening, with low-velocity tool, what power level must you start with?
Weakest
Name two ways powder-actuated cartridges are fired
- Rim-fired
- Centre-fired
List three rules for loading a fastener into a powder-actuated tool
1) Piston must watch the fastener
2) Fastener washer guide must snugly fit
3) Proper cartridge for the tool must be used
What are the two purposes of the plastic or metal guide around the fastener?
They hold the fastener in the fastener guide and keep them straight when fired
You are attempting to fasten a soft material to concrete. You discover that the fastener is penetrating the material too deeply. What should you use to decrease penetration?
A washer
What is the minimum thickness of steel for accepting a powder-actuated fastener?
5 mm (1/4”)
How much penetration should there be when setting a fastener into steel?
Protrude through the material by 5 mm
What’s the minimum distance from a torch cut or a weld a fastener can be placed?
50 mm (2”)
What minimum thickness of concrete for fastening with a powder-actuated tool?
The minimum thickness of concrete into which a fastener can be set must be 3 times the penetration of the fastener, but at no time may the concrete be less than 75 mm
Does high velocity powder-actuated tool have a piston?
NO
What are the types of cartridges from weakest to strongest?
Brass (low velo)
Nickel (high velo)
1) Grey
2) Brown
3) Green
4) Yellow
5) Red
6) Purple
How to select the length of the fastener?
Think of the material and the amount of penetration EX 65 mm is needed to penetrate 89 mm member into concrete
When fastening soft material what must you do?
You need to use an additional washer to prevent shearing the stop ring and damaging the base plate of the tool
Before fastening to steel:
Use a centre punch
