I did the design
and printed off a test
The next stage is to test printing flexible PLA filament which may or may not work on my printer. I've ordered a test sample from rigidink to try.
To those who want to try printing, here is the openscad code
tyre ();
module tyre() {
$fn=100;
difference () {
union () {
translate ([0,0,-1.5])cylinder(15,34,34);
rotate_extrude (angle=45, convexity = 9) translate ([32,-0.5,-2.75]) circle (r=2);
rotate_extrude (angle=45, convexity = 9) translate ([32,12.5,-2.75]) circle (r=2);
difference () {
union () {
translate ([0,0,-2.5])cylinder(17,32,32);
translate ([0,0,-3])cylinder(18,27,27);
}
//translate ([0,0,-3.5])cylinder(20,25,25);
translate ([0,0,13.6])cylinder(1.5,20,25);
translate ([0,0,-3.1])cylinder(1.5,25,20);
}
}
translate ([0,0,-3])cylinder(18,17,17);
for (z = [0:12:360])rotate(a=(0)+z,v=[0,0,1])translate([28.8,0,-3]) cube ([6,3.5,8]);
for (z = [0:12:360])rotate(a=(30)+z,v=[0,0,1])translate([28.8,0,7]) cube ([6,3.5,8]);
}
difference () {
union () {
translate ([0,0,-0.5])cylinder(13,32,32);
rotate_extrude (angle=45, convexity = 9) translate ([30,0.5,-2.75]) circle (r=2);
rotate_extrude (angle=45, convexity = 9) translate ([30,11.5,-2.75]) circle (r=2);
}
translate ([0,0,-3])cylinder(18,17,17);
}
}
If Anyone wants a master to mould tyres from then I can produce one at £5 a shot plus postage
The dimensions are:
OD 67.5mm
ID 33.5mm (designed for use with the hub designed by Wibbly with a minor mod which I will happily pass on to anyone interested
Width 17.6mm - This is the reason for producing the tyres as I need to have a double rear tyre and there's nothing out there this size.
Cheers
Alwyn
