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Pulley Library

by kitwallace, published

Pulley Library by kitwallace Mar 11, 2013
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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

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