Saws Flashcards
Types of blades on the Rotary Saw
Abrasive blade
Combi-Blade
Diamond Blade
Carbide Tooth Blade
Size of Blades on Rotary Saw
14 inch
Abrasive Blades are used on what kind of surfaces
steel, steel alloy, and other hard metals
Minimum size of blades on rotary saw to remain in service
12 inches
Combi Blades uses
bare metal, concrete, reinforced concrete, masonry, or Robertson decking
Are combi Blades bi directional?
yes
Cut depth of Combi blades
4 3/4
When shall combi blades be replaced
Any one segment is fractured, broken or missing.
● Bald spots along any of the segments occur.
● Matrix bond is equal to the thickness of the blade body; a step or lip no longer
exists
Carbide tip blades are used for cutting what
roofing material, wood, and lexan
The purpose of the decompression valve is to ___
reduces the pressure in the cylinder to assist with starting the saw
You should press the air purge diaphragm how any times prior to starting the chain saw
6
Flooding procedure for rotary saw
Ensure the Choke is pushed in and the half throttle is engaged. This allows the maximum
amount of air to flow through the carburetor, combustion chamber and out the exhaust.
2. Pull starting cord and cycle the saw quickly about 4-5 times. As the air to fuel mixture in
the combustion chamber lowers it will start.
The rotary saw shall not be run for more than __ seconds without a load
6 seconds
Checks are documented on what form
F-973M
Forces that cause resistance to the intended movement when cutting is called ____
the gyroscopic effect
Which color fuel can supplies 50:1 premix?
Yellow
Which color can supplies normal gasoline
Red
A 2 stroke engine takes what kind of fuel?
50:1 Premix (Yellow Can)
A 4 stroke engine takes what kind of fuel
Normal Gasoline (Red Can)
What are the 2 Different chain brakes on the chain saw
Manual and automatic
How can you engage the chain break on the chain saw
Press your left wrist forward on the hand guard to engage it
START position for a cold rotary saw
Decompression valve IN, Choke OUT, STOP switch pulled left (run position), pull chord until you hear it want to turn over, press Choke IN, continue pulling until it starts, disengage fast idle with throttle interlock
START position for warm rotary saw
Decompression valve IN, Choke IN, STOP switch pulled left (run position), pull chord
The chain brake on the chainsaw engages in how many tenths of a second?
1/10th
The safety member of a chain saw should remain in contact with them while they are cutting utilizing what kind of grip?
underhand grip on the scabbard belt
START position for chain saw while cold
Chain Break OFF, grasping the throttle interlock, and place master control lever in choke position.
Crank engine until it begins to fire, place master control in to start position, pull chord unti engine starts, once it starts immediately squeeze throttle interlock to take it out of fast idle
cut depth for the chain saw depends on what factors
- Type of construction
- Thickness of roof covering
- Thickness of decking
- Intended operations
carbide tips on the chain saw should be replaced when-
- Missing/damaged tips on 3 or more cutters in a row.
- Missing /damaged tips on 6 or more cutters at random.
- Cracked/broken tie straps
- Dull chain
To adjust the chain tension, you need to-
- Loosen drive sprocket cover nuts.
- Grasp tip of guide bar and raise to remove slack between guide bar and mounting studs.
(Figure 6) - Adjust tension screw, located inboard of the guide bar on the front of the chain saw. Turn
clockwise to tighten - While tightening adjusting screw, pull chain through its travel to locate any high spots.
Make final tension adjustment to tightest place on chain. - Tension is correct when the chain travels freely around the bar as it is pulled by hand and
the bottoms of all tie straps and cutters touch the underside of the bar rails. - Tighten drive sprocket cover nuts.
A daily check of the chain saw includes-
- Check fuel level. Add mixed fuel if necessary.
- Check lubricating oil level. Add if necessary.
- Check chain condition, tension, and proper direction of travel.
- Check controls for proper starting position.
- Check carrying strap and hooks for condition.
- Check gauntlet gloves for proper location and condition.
- Make a visual check of tile chain saw for loose fasteners and/or covers.
A weekly check of the chain saw includes-
- Perform daily checks.
- Start chain saw.
- Depress manual oiler several times if chain saw is so equipped.
- Run up RPM by alternately depressing and releasing throttle trigger. Run until warm
- Check to see if chain is oiling properly.
- Place chain saw on firm surface. At idle speed, engage chain brake. Improper chain brake
operation shall be reported to the shops. - Shut off chain saw and allow to cool.
- Check chain tension and readjust if necessary.
- Inspect starter cord for fraying and contamination. Inspect security of starter cord handle.
- Top off fuel and chain lubricating oil levels if necessary.
A monthly check of the chain saw includes-
- Perform daily checks
- Remove spark plug. Check gap and condition. Clean, regap or replace if necessary.
- Inspect engine case for cracks and/or leaks.
- Inspect the fuel assembly for leaks, cracks or soft fuel lines. DO NOT operate chain saw if a
fuel leak exists. - If a tank of fuel has not been used in the previous 30 days, drain fuel and refill with fresh
fuel mix. - Remove air cleaner housing. Check air cleaner for tears and general condition.
- Inspect security of carburetor and all linkage.
The clutch on the chain saw engages at
3,000 rpm
the chain saw engine is what size and how much horsepower
4.4 cubic feet engine
4.69 hp
The chain saw idles between what
2,400 - 2,600 rpm
Lattle throttle position ion the chainsaw develops at what
7,000 rpm
Blades less then ___ inches must be replaced
9 inches
Which blade is used to cut steel
abrasive
which blade should be used to cut metal, concrete, reinforced concrete, or masonry
combi blade
concrete diamond blades proper cutting direction can be found where
an arrow stamped on the blade indicating cut direction
which blade is used to cut composition roofing material
carbide tip blades
