1. Teknologi Dan Rekayasa
POWER DRIVENS HAND TOOLS

2. USE THE POWER DRIVENS HAND TOOLS
Objectives :
After studying this unit, the student will be able to :
Select the power driven hand tools.
List the uses for power driven hand tools.
List the precautions to be followed to insure the safe operation of power driven hand tools.
List the safety rules for the use of power driven hand tools.
Teknologi dan Rekayasa

3. POWER DRIVENS HAND TOOLS
All power driven hand tools are energized by an electric current. The electric current drives an electric motor which is the heart of the tool. The motor converts the electrical energy to mechanical energy wihch does the work for which the tool is intended.
The worker must always follow certain precautions in the use of power driven tools to prevent the possibility of a shock.
An electric shock is the passage of an electric current through an individual’s body to the ground to complete an electrical circuit.
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4. POWER DRIVENS HAND TOOLS
It necessary to check that :
The tool is grounded properly with a third wire
The cord and tool are properly insulated
The operator is not in contact with wet or damp ground
The operator is not in contact with an outside source of current.
The cord is not crimped.
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5. POWER DRIVENS HAND TOOLS
For proper operation, electric tools a constant line voltage as specified on the nameplate of the tool.
A low line voltage will cause a decrease in the speed of the tool and a high voltage will increase the speed. In both cases, the tool will heat up quickly. Excessive heat will damage the tool.
The value of the line voltage supply should be compared with the rating on the nameplate of the tool to insure that they are compatible.
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6. POWER DRIVENS HAND TOOLS
As the distance between the point of use of the tool and the source of power increases, extension cables must be used. The conductor wires of the extension must be of the correct size so that a constant line voltage is maintained.
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7. ELECTRIC DRILL
One of the most useful power driven tool is the electric drill.
Both standard general purpose and heavy duty drills are available. Both types of drills can be obtained with chucks sized to hold ¼, 3/8 or ½ inch drills. Single speed and available speed electric drills are available.
Trigger speed controls are mounted in the drill handle. There are three types of drill handles: in-line grip, pistol grip, and side grip.
Teknologi dan Rekayasa

8. ELECTRIC DRILL
For variable speed drills, the speed can be controlled from zero rpm to the maximum rpm rating of drill. Some drills have reversible motors controlled by a switcth located bellow the trigger switch.
All drills have heat treated, helical alloy steel gears and hardened shaft, key type chucks.
The following accessories added to any type of drill: right angle drive unit, grinding wheel, wire wheel brush, cloth buffing wheel, or extension shanks.
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9. ELECTRIC DRILL

10. HOW TO USE AN ELECTRIC DRILL
Variable Speed Drill
Mark the center of the hole to be drilled.
Tighten the drill bit in the chuck with a key.
Place the drill point on the center of the hole to be drilled.
Hold the drill bit at a 90 degree angle to the surface to be drilled with the drill point on the center punch mark.
Press the trigger switch of the drill on and off until the hole center is secured.
Teknologi dan Rekayasa

11. HOW TO USE AN ELECTRIC DRILL
Singe Speed Drill
Mark the center of the hole to be drilled and center punch the location.
Tighten the drill bit in the chuck with a key.
Hold the drill bit at a 90-degree angle to the surface to be drilled with the drill point on the center punch mark.
Press the trigger switch of the drill on and off until the hole center is secured.
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12. HOW TO USE AN ELECTRIC DRILL
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13. HOW TO USE AN ELECTRIC DRILL
Press and bold the trigger switch on and apply forward pressure to the drill until the hole is drilled.
CAUTION :
Never try to hold a turning chuck.
Remove the chuck key before starting the drill.
Turn the drill off immediately if the bit start to bind in the material.
Avoid excessive pressure.
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14. PORTABLE GRINDER
The portable grinder is available with 4-, 5-, or 6-inch grinder wheels. It is driven by a 115 volt, 60 HZ, 4000 – 6000 rpm motor. It is factory lubricated for an initial operating period of 2 to 6 months, depending upon the amount of use.
The portable grinder has a lightweight aluminum alloy housing, an adjustable shatterproof steel guard, an enclosed dustproof switch, helical alloy steel gears and shaft, and oversize ball bearings.
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15. PORTABLE GRINDER
Commonly used accessories are the crimped wire brush and the cloth buffing wheel.
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16. HOW TO MOUNT GRINDING WHEELS
Disconnect the tool from the electric outlet.
Remove the wheel guard cover by removing the screw at the top of the cover.
Hold the wheel and remove the spindle nut with a wrench.
Lift off the outer wheel flange, rubber flange washer, and the grinding wheel.
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17. HOW TO MOUNT GRINDING WHEELS
Clean the spindle and threads.
Replace the grinding wheel, rubber flange washer, and the grinding wheel.
Replace and tighten the spindle nut.
Replace the guard cover and fasten it securely.
Run the grinder at full speed for about a minute.
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18. HOW TO USE THE PORTABLE GRINDER
Grasp the grinder firmly, allow the motor to reach full speed.
Apply the wheel to the work gradually.
The grinder may be used with the wheel held parallel to the work or the wheel may be placed at an angle to the work.
CAUTION :
Never use the side of the wheel for grinding.
If the grinder begins to bind on the material, remove it immediately.
Never use a damaged or badly worn wheel.
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19. SAFETY
Each worker must assume responsibility for the safe operation of any equipment he is using.
The worker must maintain and operate any machine in strict conformance with the manufacturer’s safety rules and guidelines and those established by the Occupational Safety and Health Act.
Accident in the shop are caused by careless, preoccupied and overconfident people.

20. SAFETY RULES FOR POWER DRIVENS HAND TOOLS
The following safety rules for the use of power drivens hand tools.
Know your power tool
Ground all tools unless double insulated
Keep guards in place and working order.
Keep the work area clean
Avoid dangerous environments
Keep all visitors away from the work area
Store unneeded tools

21. SAFETY RULES FOR POWER DRIVENS HAND TOOLS
Don’t force any tool
Use the right tool
Wear the proper apparel
Use safety glasses with most tools
Don’t abuse the electrical cord.
Secure your work
Don’t overreach.
Maintain tools with care.
Disconnect tools.
Remove adjusting keys and wrenches.
Avoid accidental starts

22. THE END
Teknologi dan Rekayasa