So will the bar and chain oil that you use in your chainsaw. The same motor oil that you use in your lawn mower (10W-30) will work. My response, as an oiler, is that almost any oil is better than no oil. People worry about what oil they should use to lubricate their metal cutting. Use a shop cloth below the blade to catch what drips off. Hold the oil over the blade and apply a few drops. The issue is whether the particles will slide around more freely and whether the teeth themselves can slide more freely over the metal.Īpply a little oil to the hacksaw blade before beginning, and reapply as needed for thick cuts. My response is that the metal particles will stick to the blade whether you oil or not. People say that oil causes metal particles to stick to the blade. Metal workers argue about this incessantly, with people forming two camps-“oil” and “don’t oil.” I’m an oiler. If you expect to saw very thick sections of metal or thick sections of soft materials (brass, copper, plastic) then add a 14-tpi blade. The tooth counts on the three top blades are the three common types that you should own: 18, 24 and 32 tpi (teeth per inch). So long as you don’t overtighten the carbide grit blade in a high-tension frame, it will work in a high-tension saw frame without snapping. The top three blades can be used in either a standard-tension hacksaw or in a high-tension hacksaw. Three typical bi-metal hacksaw blades (top) and a carbide grit blade (bottom). For metal that is thinner, use a blade with 24 or 32 teeth per inch. For metal that is in the vicinity of 1/16-inch thick and thicker, use a blade with 14 to 18 teeth per inch. The cut goes much more easily when you switch to a 32-tpi blade.Ĭommon hacksaw blades are available with 14, 18, 24, and 32 teeth per inch. If you try cutting that with a 14-tpi blade, you’ll find that the teeth will snag on it. The same holds true for cutting something thin, like sheet metal. It's much easier to cut such a thick piece of metal using a blade with 14 or 18 teeth per inch. The fine teeth become clogged with metal particles. That is, if you cut thick material (say a half inch thick) with a blade that has a large number of teeth per inch (say 24 or 32 teeth), you’ll find it tough going. The goal is two have a minimum of two hacksaw teeth in contact with the material, while not increasing the tooth contact to the point where the blade clogs with the waste particles that it is producing. The immutable law of hacksaw knowledge boils down to this: Thick materials require a blade with fewer teeth per inch, while thin materials require a blade with more teeth per inch.
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