Portable Power and Air Tools, and Explosive Actuated Tools Flashcards
When using a power tool when should you use a ground fault interrupter circuit (GFCI)?
When there is possibility of damage to your extension chord or when using the tool in damp locations.
Where should the guard be positioned on a handheld grinder?
Between the grinding disc and the operator to protect against sparks and fragments.
How are hammer drill bits or concrete and masonry drill bits different from regular drill bits?
They have a carbide tip that is strong enough to take the scraping and hammering action of the drill.
Is it safe to carry a portable grinder by the power chord?
No.
Is it safe to use standard sockets with electric impact wrenches?
No.
If a power drill is larger does it operate at lower rpms and higher torque?
Yes.
Can you use conventional drills with a hammer drill?
Yes, as long as you can switch off the hammer action.
Do most cordless drills have torque control?
Yes.
Does prolonged use of power or air tools cause carpal tunnel syndrome?
Yes.
Is it safe to run an impact wrench with a universal joint and socket attached?
No, because it may throw the attachments off.
In an explosive actuated tool, what is the power load?
The loaded cartridge. It provides the energy to drive the fastener.
A power load with a crimped end should only be used in what velocity of tool?
Low velocity.
How is power load strength identified?
A numbering system form 1 to 6 indicates power, with 1 being the weakest.
The colour of the box, and on the end of the load, also indicates power load.
Why should fasteners or other metal objects not be carried in the same pocket as power loads?
They may set off, causing serious injury or death.
Why is adequate ventilation required when operating explosive actuated tools?
To prevent the ingestion of lead.
What is the most common fastener for most practices?
Drive pins.
What type of fastener is comprised of a shank that is driven into the base material and a threaded portion to which an object can be attached with a washer and nut?
Threaded studs.
Why must you never overtighten a nut on a threaded stud?
It could pull out the stud.
What type of fastener is used to mount a bracket, fixture or clip?
Drive pin assemblies.
By what dimension are light and heavy duty fasteners categorized?
The diameter of the shank.
Under 3/16-inch is light duty.
Over 3/16-inch is heavy duty.
What are unsuitable types of base materials for driving explosive fasteners into?
- Hard - can deflect off.
- Brittle - cracks or shatters.
- Soft - passes completely through.
How does using the fastener as a center punch allow you to test the material for hardness?
If the fastener becomes blunted than the material is too hard. If not, carry on with testing brittleness and softness.
To determine the suitability of a base material, use a fastener as a center punch struck by a single hammer blow. If the material cracks or shatters, should you fasten to the material?
No, the material is too brittle.
To determine the suitability of a base material, use a fastener as a center punch struck by a single hammer blow. If the fastener penetrates easily, should you fasten to the material?
No, the material is too soft.
What is the correct depth for a properly set fastener?
The fastener should penetrate 6 to 8 times the diameter of the shank, but should only penetrate the base material to a depth of 1/3 the total material thickness.
what can setting fasteners too close together or too close to the edge of the base material cause to happen.
Cracking.
At what strength should concrete be before attempting to fasten into it?
65- to 75- percent of its design strength.
What is spall?
Fracturing of the base material at the surface.
What are two things that can be used to reduce spall?
Use a finishing disc or a spall reducing adaptor.
Why should you not fasten into pre-cast concrete or pre-stressed concrete without approval from an engineer?
Fasteners may damage the steel cables within the concrete and failure may occur.
What are the general spacing requirements for driving fasteners?
No closer than 3-inches (75 mm) from the edge of concrete.
No closer than 3-inches (75 mm) apart.
When fastening to steel, how can the load strength be increased?
Use a knurled shank.
Is a fastener set in thick steel members in which the point cannot completely penetrate still an acceptable fastening?
Yes, if the correct power load and fastener size are used.
How deep through the steel should the fastener penetrate to get the maximum holding power?
1/4-inch (6 mm).
Why should you not use a fastener with a shank longer than required when fastening to steel?
The burnishing effect of a long shank passing through the steel enlarges the hole, reducing holding power.
What is the general recommendation for spacing when fastening to steel?
1/2-inch (15 mm) from the edge.
Spaced 2-inches (50 mm) apart.
Can you fasten into areas that have been welded or cut by a torch?
No, the metal can be to hard for explosive actuated system fastening.
Why should you avoid overdriving a fastener into steel?
- Excessive force can damage the fastener.
- Rebound of the fastener reduces its holding power.
- It reduces useful thread length.
How is the explosive actuated tool cleaned?
Apply a slight film of solvent to all the parts, scour them with a wire brush to remove all traces of carbon, and wipe them dry with a cloth.
How often should the explosive actuated tool be cleaned?
Every day after use.
Should you use lubricant on the explosive actuated tool?
Do not use lubricant. It fouls the operation of the gun.
How should explosive actuated tools be stored?
Unloaded and in a locked container.
