Language & CommunicationPresentation :How to use a hacksaw.Prepared by : Md.Syadza Nurhafizh bin SulaimanDIP 1/MRE/C
What is hacksawHow does a hacksaw looks likeTypes of teethTooth setSafety precautionMethodsDifficultiesConclusionContents
A hacksaw is the right tool for the job. Hacksaw is a manual saw that consists of a metalframe for securing a narrow, toothed blade and canbe used for cutting wood, metal, plastic and othermaterials.Need to cut metal ?
32 teeth per inch gives a finer cut and is good for cutting thin gaugesteel or thin-walled tubing, copper tubing or heatingduct.24 teeth per inch used for medium steel and regular walled tubing.also good for cutting angle iron, heavy pipe, brassand copper.18 teeth per inch used for hard metal iron pipe and large pieces ofsteel.14 teeth per inch work well with soft metals like aluminum and tin.12 teeth per inch used for pipe, tubing, plastic, wood or high speedsteel.Types of teeth
Tooth setRegular/Straight• These workwell on softermetals.• The teeth arelined uptouching eachother andalternation leftto right.Raker• Perfect forcutting thickmetals.• The teeth areplaced in setsof three.Wavy• The rightchoice for hard,thin metals.• The teeth areset in a wavepattern fromleft to right fora smooth, finecut.
Choose the correct blade for the material being cut. 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 bladeto keep it from overheating and breaking. Cut harder materials more slowly than soft materials.Safety Precautions :
To really use a hacksaw well you need to clampyour work. Grip the frame with both hands. As you push the blade (forward stroke) use yourleft hand to guide the saw so that it cuts straight. DO NOT use your left hand to apply pressure,just use it to guide your cut.Ok, let’s cut a metal !
When you get to the end of the forwardstroke, stop and pull the saw back with yourright hand. As you pull back dont apply any pressure withyour right hand. Move your body forward and back as youcut, pressing on the forward stroke and easingoff on the return one.
Repeat this until you saw all the way throughthe workpiece. Dont stroke any faster than this because it willcreate too much heat and again wear out theblade prematurely. Wipe your saw clean after each use. Hang it uphigh for safety reasons between uses.
They arentusing a sharpblade.The numberof teeth is toogreat for theproject.They areputting toomuchpressure onthe saw.Difficulties when sawing metal
Store blades in a dry place and apply a light coat of oil whennot in use. Replace damaged saw handles with new ones immediatelywhen needed. Always loosen the blade tension on a hacksaw when not inuse. Avoid placing heavy tools or objects on saw blades asthis can result in distortion of the blade.Care of saws
Hacksaws are handy cutting tools that areuseful additions to a homeowners toolbox orsmall garage shops.Replacement hack saw blades are available atmost hardware stores. Make sure you selectthe appropriate blade as indicated by thenumber of teeth per inch. Do not use athinner coping saw blade in a hacksaw.Conclusion