The document discusses the proper use of hacksaws. It begins by stating the learning objectives which are to explain what a hacksaw is, identify its parts, state its functions, and how to properly use one. It then lists common reasons why hacksawing may not work properly, such as using the wrong blade, not clamping the work, or applying too much pressure. The document goes on to identify the parts of a hacksaw and provides safety tips for its use, such as selecting the correct blade, keeping the blade rigid, and clamping thin materials. It concludes by describing the proper method for hacksawing, including orienting the work vertically and using full strokes to involve all teeth.
2. At the end of the lesson, student should be able:
• Explain the definition of Hacksaw.
• Recognized each part of Hacksaw.
• State functions of Hacksaw.
• Determine the appropriate way using a Hacksaw.
3. BASED ON THE VIDEO GIVEN, WHY
THIS PROBLEMS OCCURRED?
• You have the blade in wrong.
• You are not using sharp blade
• The number of teeth is to low for the project.
• You are putting too much pressure on the
saw.
• You don’t clamp the work.
“Practice Make Perfect”
5. Refer on:-
•Engineering Drawing Form 4 Text Book
Used to cut a work piece into desire sizes.
•Wikipedia
http://en.wikipedia.org
•Kamus Dewan Edisi Empat
http://prpm/dbp.gov.my
6. To cut metal
Plastic
Wood
Metal Tubing
Aluminum
Copper
Brass
Electrical Tubing (conduit)
Plastic water pipe
12. How to properly & safety use a
hacksaw
• General Hand Protection When Using a Hacksaw
• General Eye Protection When Using a Hacksaw
• Holding the hacksaw Correctly
• Safety With Materials
• Cutting Effectively and Safely
• Safe Storage and Care of Hacksaws
13. Hacksaw Safety Tips
• Choose the correct blade for the material being cut.
• Secure the blade with the teeth pointing forward.
• Keep the blade rigid and the frame properly aligned.
• Cut using strong, steady strokes directed away from you.
• Use the entire length of the blade in each cutting stroke.
• Keep saw blades clean, and use light machine oil on the
blade to keep it from overheating and breaking.
• Cut harder materials more slowly than soft materials.
• Clamp thin, flat pieces that require edge cutting.
• If you’re cutting pipe, always secure it in a vise before
cutting.
14. Step 1. Determine which blade you will use to cut the material.
Step 2. Insert the blade so that the teeth are pointing forward.
Step 3. Tighten the thumbscrew until u can’t turn it with your hand
(Hand tight)
15. Hacksawing Method
• You should work in the vice so that as many
teeth as possible are in contact with the
surface.
• You should orientate the work so that you are
cutting vertically toward the floor.
