I need a little help finishing this function to be exact I would like
hfac to be just spiral height in mm from center wire to center wire,
but somehow I endup fraking it up algebra can suck at times but I
think I just not seeing the solution as the germans' say "can't see
the forest because of all the trees"
here is my budding function with instructions :
<code>

module spiral(rev,hfac,wfac,base_r,sp_r){
for (i=[0:0.5:rev*360]){
translate([0,0,i/hfac])
rotate([90,0,i])
translate([base_r-(i/wfac),0,0])
cylinder(r=sp_r, h=0.4, $fn=32);
}

}
/spiral module instructions
rev= revolutions the spiral makes
hfac= height factor derived by (360rev)/height in mm)
wfac= incline of the spiral minimum about 15% of rev*360 play with it
to get your best approximate shape) anything under 15% gives you wierd
inverted results before the top
base_r= radius of the bottom spiral
sp_r= radius of the "wire" in mm

*/
// example
spiral(4,60,170,8.75,0.9);
</code>
help
terramir

This one might make more sense.

coil.scad http://forum.openscad.org/file/t2140/coil.scad

There may be some other way to do things, but this calculates the path the
spring is on and then 'extrudes' along that path.

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If you want to do the angles in degrees instead, you can just replace 360
with 1.

Lines 42-46 and then 63-72 make the tapered windings.

It's possible to do fancier stuff to get something that looks better, but
I'm not sure what application you have in mind.

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