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++++++++++++++++++++ As OpenSCAD does not support function pointers, it is not an extensible approach to calculate the thread specs from pitch and Dpitch. Instead, I pre-calculate *all* of the specs in a table. The idea is to extend this table with further threads (such as metric threads, conic threads, bottle threads, etc.) later on. Step 1: Calculate THREAD_TABLE in Excel.
PET-Bottle Waterrocket Fins +++++++++++++++++++++++++++ This is a CAD-model of fins intended to be screwed onto a PET bottle to create a water rocket. To create the rocket, you need: - bottle with PCO-1881 threading (e.g. a 1.5-l Coke bottle) - this part - Gardena tap connector G 1" - launcher (+ water + pressurized air). Use at your own risk.