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2 terminal smd chip: Pad equations where outdated

Rene Poeschl requested to merge github/fork/poeschlr/smd_chip_fix_pad_size_eq into master
  • New industry standards have updated not only the fillet sizes but also the way how tolerances are respected.
  • For devices that directly give the lead to lead spacing no complicated calculations are necessary. (was wrong previously)

Sorry for again getting it wrong. I noticed my mistake when i made this post on the forum (The new equations make a lot more sense to be honest.)

This results in slightly increased pad to pad clearances for a lot of devices. (All tantals and most parts larger than 1210. For smaller parts there is no change as rounding hides the mistake.)

Some of the current tantals had extremely small pad to pad clearances. So they are not usable without this update.

The change to the script is done in this commit: https://github.com/pointhi/kicad-footprint-generator/pull/125/commits/c419ebb0d5573f119eb134bcd1a6ec4151a38bda

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