Resistor lead forming tool
by dnewman, published
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There are two kinds of wire wrap tools: The joke kind, a single-ended silver thing with a little easily-lost stripper tool in a separate cavity which costs a million bucks. And the two-ended kind with built-in stripper and remover which only costs a few.
PCB layout designers are free to use whatever lead spacing they want, regardless of the component size. (And yes, you can even make the lead spacing narrower than the component's length which is where you end up with resistors mounted standing up on end.) One classic example is when you straddle a resistor over several traces in which case you may end up with lead spacing wider than otherwise normal. That's done to avoid use of a via. Another common case is when you make your own PCBs: it's a lot easier to drill a series of holes which are all lined up nicely. As such, you may make the lead spacing the same for several resistors and, say, diodes even if the spacings are wider than normal for some of the components.
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metric: lead spacings in increments of 2 millimeters
imperial: lead spacings in increments of 0.05 inches
narrow: for small resistors whose bodies are no longer than 6.75 mm (0.25 inches)
wide: for medium resistors whose bodies are no longer than 10.50 mm (0.40 inches)
long: a long tool with lead spacings up to 40 mm (1.5 inches)
short: a shorter tool with lead spacings up to 30 mm (1.0 inch)
The two OpenSCAD source files are nearly identical with the only difference being that one has settings for metric units whilst the other imperial. As the files are fully parameterized: it is easy to change the increments, dimensions, spacings, widths, etc. of the tools by editing the OpenSCAD files and then re-rendering the tools.
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