Because for any given thickness of material, there is an optimum TPI (teeth per inch) on the blade. So I have three hacksaws with coarse, medium, and fine blades mounted. Saves labor of swapping, and hacksaw frames are ~ $1 each at garage sales https://twitter.com/doughcollector/status/1153307782147452934 …
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3/ Less teeth than that (i.e. 1- 2), and the number of teeth engaged at any given time can swing pretty quickly, in percentage terms (i.e. at 1.8 teeth embedded, you're actually oscillating between 1 and 2 teeth at any given moment). This leads to surging, which can break teeth
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4/ so, pro-tip for hacksaws: * go to garage sales, but three frames * buy a 10 pack of fine blades, medium blades, coarse blades * label your three hacksaws with either a Sharpie and/or color-coded electrical tape * use the right tool for the job
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5/ Changing blades is for suckers. This is why I also own three 4" angle grinders. It you have the means, it is SO CHOICE to put down the one with the cutting blade, pick up the one w the grinding blade, then swap again for the wire wheel.
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6/ Duplicates also prevent down time in case of breakage. I snapped paddle switch off a grinder recently, so just grabbed one of the others. Yes, I had to switch blades (LIKE A PEASANT), but at least I kept working. two is one; one is none blah blah https://twitter.com/doughcollector/status/1153311069659652097 …
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