RC Tank Warfare community hobby forum

Posted: **Sat Dec 23, 2017 1:43 pm**

Test print in progress, if it fits the Quad and the hub offset is ok, all I will need is the tyres that are on their way.

: quad wheel.png (20.6 KiB) Viewed 1125 times

rotate([-90,0,0])hub();

//**************************
module hub ()
{
$fn=100;
difference(){
difference (){
union () {
translate ([0,0,-3])cylinder(18,17,17);
translate ([0,0,-3])cylinder(1.5,19,19);
translate ([0,0,13.5])cylinder(1.5,19,19);
translate ([0,0,0])cylinder(1.5,21.5,21.5);
translate ([0,0,10.5])cylinder(1.5,21.5,21.15);
}
translate ([0,0,-6])cylinder(15,15.5,15.5);
translate ([0,0,11])cylinder(5,15,16);
translate ([0,0,0])cylinder(16,1.3,1.3);
difference()
{
translate ([0,0,14])cylinder(2,17,17);
translate ([0,0,14])cylinder(2,14,16);
}
}
}
difference(){
union(){
translate ([0,0,10.5])cylinder(2,10,9);
translate ([0,0,-3.5])cylinder(19,4,4);
translate([0,0,6])rotate ([0,0,0]) cube ([32,2,8],center=true);
translate([0,0,6])rotate ([0,0,90]) cube ([32,2,8],center=true);
}
translate([0,0,-4.9])rotate([0,0,30])cylinder(30,3.5,3.5,$fn=6,center=true);
translate ([0,0,0])cylinder(16,1.3,1.3);
translate ([0,0,11])cylinder(16,2.7,2.7);
}
for (z = [0:45:360]){rotate(a=(360/55)+z,v=[0,0,1])translate([12.5,(45/55),11]) cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360]){rotate(a=(360/55)+z,v=[0,0,1])translate([6,(45/55),12.5])cylinder(1,1,1,$fn=6,center=true);
}
}
}

Edit: This needs a couple of very minor tweaks, will repost the code when I have made it fit.

Posted: **Sat Dec 23, 2017 4:01 pm**

Yes I loaded the scad and see why the rotation.... DOH! It just looked weird rotating the drive shaft hole until I saw you were aligning for maximum strength.

Alwyn

Posted: **Sat Dec 23, 2017 5:37 pm**

It was so that I could align it with the flats on your original and change the diameter until it matched. I overdid it a fraction, but its now perfect. Had to tweak the hub offset as the track was too wide. With the tyres this is still going to be a tight squeeze!

About to print what should be the third and final version. The rears are different so a bit more tweaking..

Posted: **Sat Dec 23, 2017 9:15 pm**

Well after several attempts I managed to get a wheel with strength in the slimmed down rims, an acceptable rim offset, and that look like they should.

This is the code I created to do it.

rotate([-90,0,0])hub();
//**************************
module hub () {
$fn=100;
difference (){
union () {
translate ([0,0,-3])cylinder(18,17,17);
translate ([0,0,-3])cylinder(1.5,19,19);
translate ([0,0,13.5])cylinder(1.5,19,19);
translate ([0,0,0])cylinder(1.5,21.5,21.5);
translate ([0,0,10.5])cylinder(1.5,21.5,21.15);
}
translate ([0,0,-5.25])cylinder(15,14,14);
translate ([0,0,11])cylinder(5,14,15);
translate ([0,0,0])cylinder(16,1,1);
translate ([0,0,14])cylinder(2,16,16);
translate ([0,0,14.5])cylinder(2,17,17);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
}
difference(){
union(){
translate ([0,0,10.5])cylinder(2,12,9);
translate ([0,0,2.5])cylinder(12,4,4);
translate ([0,0,11.25])cylinder(3,6,5.5);
translate([0,0,6.5])rotate ([0,0,0]) cube ([32,2,8],center=true);
translate([0,0,6.5])rotate ([0,0,90]) cube ([32,2,8],center=true);
}
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
translate ([0,0,8])cylinder(10,1,1);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
}
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([12.5,(10/55),11]) cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([7,(45/55),12.5])cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([4.5,(35/55),14.25])cylinder(1,0.75,0.75,$fn=6,center=true);
}

Posted: **Sat Dec 23, 2017 9:28 pm**

They look sweet!!!!

Cheers
Wayne

Sent from my iPhone using Tapatalk

Posted: **Sun Dec 24, 2017 9:59 am**

A quick edit and the rears are done to a slightly different design.

This is the code for both wheels, you can copy and paste the text straight into Openscad.

I don't have the tyres yet, I am just a little cautious about whether the outer rim is thick enough to take the pressure from the Lego tyre bead, if they break I'll just thicken them to make them stronger, and reprint them.

//rotate([-90,0,0])frontwheel();
rotate([-90,0,0])rearwheel();
//**************************
module frontwheel () {
$fn=100;
difference (){
union () {
translate ([0,0,-3])cylinder(18,17,17);
translate ([0,0,-3])cylinder(1.5,19,19);
translate ([0,0,13.5])cylinder(1.5,19,19);
translate ([0,0,0])cylinder(1.5,21.5,21.5);
translate ([0,0,10.5])cylinder(1.5,21.5,21.15);
}
translate ([0,0,-5.25])cylinder(15,14,14);
translate ([0,0,11])cylinder(5,14,15);
translate ([0,0,0])cylinder(16,1,1);
translate ([0,0,14])cylinder(2,16,16);
translate ([0,0,14.5])cylinder(2,17,17);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
}
difference(){
union(){
translate ([0,0,10.5])cylinder(2,12,9);
translate ([0,0,2.5])cylinder(12,4,4);
translate ([0,0,11.25])cylinder(3,6,5.5);
translate([0,0,6.5])rotate ([0,0,0]) cube ([32,2,8],center=true);
translate([0,0,6.5])rotate ([0,0,90]) cube ([32,2,8],center=true);
}
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
translate ([0,0,8])cylinder(10,1,1);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
}
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([12.5,(10/55),11]) cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([7,(45/55),12.5])cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([4.5,(35/55),14.25])cylinder(1,0.75,0.75,$fn=6,center=true);
}
//**************************
module rearwheel () {
$fn=100;
difference (){
union () {
translate ([0,0,-3])cylinder(18,17,17);
translate ([0,0,-3])cylinder(1.5,19,19);
translate ([0,0,13.5])cylinder(1.5,19,19);
translate ([0,0,0])cylinder(1.5,21.5,21.5);
translate ([0,0,10.5])cylinder(1.5,21.5,21.15);
}
translate ([0,0,-5.25])cylinder(15,14,14);
translate ([0,0,11])cylinder(5,14,15);
translate ([0,0,0])cylinder(16,1,1);
translate ([0,0,14])cylinder(2,16,16);
translate ([0,0,14.5])cylinder(2,17,17);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
}
difference(){
union(){
translate ([0,0,2.5])cylinder(12,4,4);
translate ([0,0,11.25])cylinder(3.5,5,4);
translate([0,0,6.5])rotate ([0,0,0]) cube ([32,2,8],center=true);
translate([0,0,6.5])rotate ([0,0,90]) cube ([32,2,8],center=true);
}
translate([0,0,7])rotate([0,0,30])cylinder(9.41,3.25,3.25,$fn=6,center=true);
translate ([0,0,8])cylinder(10,1,1);
translate ([0,0,12.25])cylinder(10,2.7,2.7);
}
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([9,(10/55),11]) cylinder(1,1,1,$fn=6,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([13.75,(45/55),11])sphere(0.5,$fn=100,center=true);
for (z = [0:45:360])rotate(a=(360/55)+z,v=[0,0,1])translate([3.5,(10/55),14.5]) cylinder(1,0.5,0.5,$fn=6,center=true);
translate([0,0,10.25])rotate_extrude(convexity = 10)translate([13.5, 0, 0])circle(r = 1);

}

Posted: **Sun Dec 24, 2017 11:23 am**

Thanks for sharing Rob, as soon as the wicked witch of the west let’s me back into my workshop I’ll give them a go.
Have a good in!
Cheers
Wayne

Sent from my iPhone using Tapatalk

Posted: **Sun Dec 24, 2017 11:27 am**

No probs, and of course, thanks to Alwyn for the Lego wheel/tyre dimensions.

Posted: **Mon Dec 25, 2017 5:25 pm**

Got a bit more done today. Looking a bit more like the Quad it is supposed to be.

Posted: **Mon Dec 25, 2017 6:11 pm**

Absolutely superb Rob, it looks amazing!

Are any of the scads going to be available and at what cost?

Alwyn

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