spiral saws can be used by a blind or visually impaired person with the following recommended technique. I use a spiral saw now and again when I don't have the time to start the bandsaw. when cutting awkward shapes in materials with a spiral saw, use a scribe or blade to mark the way so you can feel the cut. then align the cutter with the start of the line and gently feed in. with your thumb or finger, follow the scribe line while running the machine through the material slowly. simple job. there's no such tool that's not blind unfriendly. its just patience and a good workaround for it. as for setting up table saws for zero mode or square set. you often feel the print of the angle read out as it is raised slightly. you can feel the critical points and slowly adjust the angle and locate to zero. most standard table saws run left angled but certain saws can run both left and right. but they can be set. I had one table saw which had no markings to feel so went to a local metalworker's and asked for a 2 inch by 1 inch thick block of metal by about 12 inches. then align the block to the blade while the machine is OFF. and you will feel the block sets straight with the blade. problem solved. lew there's no such thing as cant. if you say that you usually find me breathing down your neck saying "try again........."
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