cyclic cam scad (lib)/script

scad script for some basic cam profiles

updated v0.2c adds internal cam types
and fixes a minor bug in the hypo and epicyclic profiles
updated v0.2d added a few more types
render times much improved over version 0.1 and is a complete rewrite

still a some more profiles to add before its a complete lib function
NOTE you may need to set
edit>preferences>advanced> turn off rendering at value
to 256000 in order for them to render correctly
openscad 2013.06

definable profile shape , radius, profile depth ratio, surface steps , number of lobes , height, twist ,twist slices , shaft hole size and type

read script comments for instructions
provides :-
Cyclic_Cam(profile_type,r,phr,sa,nt,h,tw,sl,hole_type,hole_size,pd)
Internal_Cyclic_Cam(profile_type,r,phr,sa,nt,h,tw,sl,pd,rim,atol)

Cyclic_Cos_Cam(r,phr,sa,nt,h,tw,sl,hole_type,hole_size)
pure cosine cam gear generator for use with a knife
edge point of contact

Cyclic_Pin_Cam(r,p