Mon Jun 16, 2014 11:49 pm
Now what I'm about to tell you is definitely cheating, lower class, wrong side of the tracks, and will absolutely piss off a LOT of people who actually went through sheet metal layout class...
When you're making little brackets, and tabs, and other minor parts with bends or flanges in them, here's a trick to save you some time. Time that adds up on a large project.
Save all your scraps, put them into different size categories. Palm sized scraps in this box, book sized scraps in that box, etc..
Make the bend first, lay out the part second. As an example, take one of your scraps, and put a bend in the middle of it, 90 degrees, 1/8 radius, pretty standard stuff on a Zenith. using a carpenter's square or T-square, you can hold the square against the bend, and easily measure out the "developed length" or "finished dimension" with a marker directly on the part. The T-square will measure out the part, inclusive of "bend allowance", and without having to fiddle with the "setback" adjustment on the brake. You also won't ruin one or two parts before you get the finished dimension right.
Of course, this will only really work on 90 degree bends, and only in places where you don't need to put a bend in a part that already has been drilled or fit on the other end. It's best for making up smaller, simpler parts. But imagine if you had 20 or 30 little scrap pieces of various sizes and thicknesses, all with ready-made 90 degree bends in them... you could save significant time and make better use of the scraps.
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