Summary

This is a rewrite of the code by droftarts to see whether structuring a library like this using a cleaner separation of data and code and a functional approach (no global variables) would help in understanding and reusing the code. This work is offered in all humility as a product of my own attempts to learn openscad. I have only tried this on a few simple cases and not printed from it.

May 2014 - code updated slighly to OpenSCAD version 2014-03

Instructions

Unlike its ancestor, this is an opencad library, not a single parameterised object. Objects are constructed by writing a main script which composes the final object from parameterised components.

In this version

code structure

belt parameters brought together as an array of belt properties
nuts are described by an array of nut properties
nuts and belt description held in 'dictionaries' keyed by the name of the part
separate modules for each part of the pulley - gear,retainers, base, captive nut
parts use common parameter names - diameter and height (since built in the z axis)
separate gear module allows 2-D projection
global variables local to part or default parameter values
composition of parts using 'stack' transformation
reuse by programming the part composition
new pulley features
shaft flat
currently ommited features
- sanity checks although mad parameters usually produce obviously mad objects
- rendering needs tweeking - its slower than its daddy and F5 doesnt work well

v1.01 - fix to simple spacing and factoring teeth_spacing from diameter calulation

Pulley Library