Centurion Mk III Scratch build

[AlwynTurner]

Well that's the lower hull finished


scad for the rear bracket
module rearbrkt () {
$fn=100;
difference () {
union () {
translate([2,-36,5])rotate([90,0,0])cylinder(2,4.5,4.5);//
translate([2.5,-36,-5])rotate([90,0,0])cylinder(2,3,3);//
translate([5.5,-38,-4.5])rotate([0,-87,0])cube([11.6,2,7]);//
translate([2.5,-38,-5.5])rotate([0,-87,0])cube([15,2,6]);//
translate([2.3,-38,-8])rotate([0,-87,0])cube([12,2,6]);//
}

translate([2,-35.5,5])rotate([90,0,0])cylinder(3,2,2);
translate([2.5,-35.9,-5])rotate([90,0,0])cylinder(3,1.5,1.5);//
}

}

rearbrkt ();

//Copyright Alwyn Turner 2018

******************
scad for the tow bar
module tow_bar () {
$fn=100;

difference () {
union () {
intersection () {
union () {
difference () {
translate ([-76,53,25])rotate ([90,0,0]) cylinder ( h=106, r=22);
translate ([-76,54,25])rotate ([90,0,0]) cylinder ( h=108, r=20);
}
}

translate ([-80,-53,3]) rotate ([0,0,0]) cube ([24,106,13]);
}
translate ([-58,-53,16]) rotate ([0,-5,0]) cube ([2,106,3]);
translate ([-59,-51,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-45.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-39,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-32.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-26,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-19.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-13,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,-6.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,0,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,6.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,13,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,19.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,26,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,32.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,39,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,45.5,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);
translate ([-59,51,17.5]) rotate ([0,90,0]) cylinder (2,0.6,0.6,$fn=6);


translate ([-65,-32,-13.2]) rotate ([0,-10,0]) cube ([5,3,20]); //right spring mount
translate ([-65,29,-13.2]) rotate ([0,-10,0]) cube ([5,3,20]); //left spring mount


rotate ([0,0,0]) translate ([-65,-32,-13]) cube ([16,3,15]); //right spring mount
rotate ([0,0,0]) translate ([-65,29,-13]) cube ([16,3,15]); //left spring mount

}
translate ([-54,-60,-16]) rotate ([0,-5,0]) cube ([10,120,50]);
translate ([-84,-15,-2]) rotate ([0,-5,0]) cube ([10,30,10]);
translate ([-88.3,-16.5,-2]) rotate ([0,-5,-40]) cube ([10,10,10]);
translate ([-82,9,-2]) rotate ([0,-5,40]) cube ([10,10,10]);
}



rotate ([0,0,0]) translate ([-64,-33.5,-10]) cube ([1.2,67,10]); // inner spring
rotate ([0,0,0]) translate ([-64,-23,-10]) cube ([2.4,46,10]); // second spring
rotate ([0,0,0]) translate ([-64,-16,-10]) cube ([3.6,32,10]); // third spring
rotate ([0,0,0]) translate ([-64,-9,-10]) cube ([4.8,18,10]); // fourth spring
rotate ([0,0,0]) translate ([-59,-4.5,-11]) cube ([1,9,12]); // hook mount back
rotate ([0,0,0]) translate ([-65,-4.5,-11]) cube ([1,9,12]); // hook mount front
rotate ([0,90,0]) translate ([-0,-3.25,-66]) cylinder ( h=8.5, r=0.5);//top bolt ight
rotate ([0,90,0]) translate ([-0,3.25,-66]) cylinder ( h=8.5, r=0.5);// top bolt left
rotate ([0,90,0]) translate ([10.25,-3.25,-66]) cylinder ( h=8.5, r=0.5);
rotate ([0,90,0]) translate ([10.25,3.25,-66]) cylinder ( h=8.5, r=0.5);
rotate ([0,0,0]) translate ([-59.5,-8.5,-11]) cube ([1,1.5,12]); // spring strap1 back
rotate ([0,0,0]) translate ([-59.5,7,-11]) cube ([1,1.5,12]); // spring strap1 back
rotate ([0,0,0]) translate ([-60.5,-15.5,-11]) cube ([1,1.5,12]); // spring strap2 back
rotate ([0,0,0]) translate ([-60.5,14,-11]) cube ([1,1.5,12]); // spring strap2 back
rotate ([0,0,0]) translate ([-61.5,-22.5,-11]) cube ([1,1.5,12]); // spring strap3 back
rotate ([0,0,0]) translate ([-61.5,21,-11]) cube ([1,1.5,12]); // spring strap3 back
//strap front
rotate ([0,0,0]) translate ([-65,-8.5,-11]) cube ([1,1.5,12]); // spring strap1 back
rotate ([0,0,0]) translate ([-65,7,-11]) cube ([1,1.5,12]); // spring strap1 back
rotate ([0,0,0]) translate ([-65,-15.5,-11]) cube ([1,1.5,12]); // spring strap2 back
rotate ([0,0,0]) translate ([-65,14,-11]) cube ([1,1.5,12]); // spring strap2 back
rotate ([0,0,0]) translate ([-65,-22.5,-11]) cube ([1,1.5,12]); // spring strap3 back
rotate ([0,0,0]) translate ([-65,21,-11]) cube ([1,1.5,12]); // spring strap3 back
//spring 1 bolts
rotate ([0,90,0]) translate ([-0,-7.75,-66]) cylinder ( h=8, r=0.5);//top bolt right
rotate ([0,90,0]) translate ([-0,-7.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([-0,7.75,-66]) cylinder ( h=8, r=0.5);// top bolt left
rotate ([0,90,0]) translate ([-0,7.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([10.25,-7.75,-66]) cylinder ( h=8, r=0.5);
rotate ([0,90,0]) translate ([10.25,-7.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([10.25,7.75,-66]) cylinder ( h=8, r=0.5);
rotate ([0,90,0]) translate ([10.25,7.75,-65.5]) nut() ;//top nut ight
//spring 2 bolts

rotate ([0,90,0]) translate ([-0,-14.75,-66]) cylinder ( h=7, r=0.5);//top bolt ight
rotate ([0,90,0]) translate ([-0,-14.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([-0,14.75,-66]) cylinder ( h=7, r=0.5);// top bolt left
rotate ([0,90,0]) translate ([-0,14.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([10.25,-14.75,-66]) cylinder ( h=7, r=0.5);
rotate ([0,90,0]) translate ([10.25,-14.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([10.25,14.75,-66]) cylinder ( h=7, r=0.5);
rotate ([0,90,0]) translate ([10.25,14.75,-65.5]) nut() ;//top nut ight
//spring 3 bolts
rotate ([0,90,0]) translate ([-0,-21.75,-66]) cylinder ( h=6, r=0.5);//top bolt ight
rotate ([0,90,0]) translate ([-0,-21.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([-0,21.75,-66]) cylinder ( h=6, r=0.50);// top bolt left
rotate ([0,90,0]) translate ([-0,21.75,-65.5]) nut() ;//top nut ight

rotate ([0,90,0]) translate ([10.25,-21.75,-66]) cylinder ( h=6, r=0.5);
rotate ([0,90,0]) translate ([10.25,-21.75,-65.5]) nut() ;//top nut ight
rotate ([0,90,0]) translate ([10.25,21.75,-66]) cylinder ( h=6, r=0.5);
rotate ([0,90,0]) translate ([10.25,21.75,-65.5]) nut() ;//top nut ight
//bolts
rotate ([0,90,0]) translate ([-0,-3.25,-65.5]) nut() ;//top bolt ight
rotate ([0,90,0]) translate ([-0,3.25,-65.5]) nut();// top bolt left
rotate ([0,90,0]) translate ([10.25,-3.25,-65.5]) nut();
rotate ([0,90,0]) translate ([10.25,3.25,-65.5]) nut();

rotate ([0,0,0]) translate ([-67,-2,-10]) cube ([3,4,10]); // hook base
difference () {
union () {
rotate ([90,0,0]) translate ([-69.5,-5,-1]) cylinder ( h=2, r=4, $fn=80) ;
rotate ([90,0,0]) translate ([-69.5,-6.5,-1]) cylinder ( h=2, r=4, $fn=80) ;
rotate ([90,0,0]) translate ([-69.5,-5,-0.5]) cylinder ( h=1, r=4.5, $fn=80) ;
}
rotate ([90,0,0]) translate ([-69,-5,-1.6]) cylinder ( h=3.2, r=2, $fn=80) ;
rotate ([0,0,0]) translate ([-70,-2,-6]) cube ([3,4,6]); // hook base

}

}


module nut ()
{
translate([-0.7,-0.4,0]) cube ([1.4,0.8,0.5]);
rotate ([0,0,60])translate([-0.7,-0.4,0]) cube ([1.4,0.8,0.5]);
rotate ([0,0,120])translate([-0.7,-0.4,0]) cube ([1.4,0.8,0.5]);
}
//}
module nut_large ()
{
translate([-1.2,-0.8,0]) cube ([2.4,1.6,1]);
rotate ([0,0,60])translate([-1.2,-0.8,0]) cube ([2.4,1.6,1]);
rotate ([0,0,120])translate([-1.2,-0.8,0]) cube ([2.4,1.6,1]);
}

tow_bar () ;
//Copyright Alwyn Turner 2018

Just have one more tricky part to do for the rear of the upper hull and that's all the printing and assembly done

Alwyn

[AlwynTurner]

The last piece of the fabrication jigsaw. I'm not sure quite what it is but on the model they show tow cables attached to it



Here's the scad
odule rearmnt () {
$fn=100;


translate([0,0,1])rotate ([0,0,0]) cylinder(7,3,3);
difference () {
union () {
translate([-7,-9,0]) cube ([22,18,1]);
hull () {
translate([0,0,1])cylinder(1,7,7);
translate([-3.5,-6.5,1])cylinder(1,2,2);
translate([-3.5,6.5,1])cylinder(1,2,2);
translate([7,0,1])cylinder(1,2,2);
}
hull () {
translate([0,0,7])cylinder(1,7,7);
translate([-3.5,-6.5,7])cylinder(1,2,2);
translate([-3.5,6.5,7])cylinder(1,2,2);
translate([7,0,7])cylinder(1,2,2);
}
difference () {
translate([4,-8,0]) cube ([11,4,8]);
translate([3,-8,0]) rotate ([0,0,45]) cube ([11,5,9]);
}
difference () {
translate([4,4,0]) cube ([11,4,8]);
translate([0,4,0]) rotate ([0,0,-45]) cube ([11,5,9]);
}

}
translate([-3.5,-6.5,0])cylinder(10,1,1);
translate([-3.5,6.5,-1])cylinder(10,1,1);
translate([7,0,-1])cylinder(10,1,1);
}
translate([-3.5,-6.5,0])cylinder(9.5,1,1);
translate([-3.5,6.5,0])cylinder(9.5,1,1);
translate([7,0,0])cylinder(9.5,1,1);
translate([-3.5,-6.5,8])cylinder(1,1.5,1.5);
translate([-3.5,6.5,8])cylinder(1,1.5,1.5);
translate([7,0,8])cylinder(1,1.5,1.5);

translate([7,-1.5,2]) cube ([13,3,5]);
translate([7,0,2])cylinder(5,2.5,2.5);
translate([18.5,-4,2]) cube ([1.5,8,5]);
translate([16.5,-4,2]) cube ([2.5,1,5]);
translate([16.5,3,2]) cube ([2.5,1,5]);
}

rearmnt ();
//Copyright Alwyn Turner 2018

and the rear end with paint on


Now down to cutting and mounting the side skirts.

Alwyn

[AlwynTurner]

Well for those who wanted to see a Centurion as they remember from dinky toy days, here she is




just the gun/turret mechanical/electrics to sort out and tighten down the gearboxes etc. Then a few coats of paint and see about a crew.

Alwyn

[tomhugill]

Superb Alwyn! She looks just right. Now where do I place my order

[Ad Lav]

Not bad at all! Great work!

[silversurfer1947]

Once again you have worked your magic and taken me back to my childhood at the same time. Now if you can find a way to actually take off a few years, that would be the icing on the cake!

[midlife306]

It’s the mutts nuts Alwyn!!
To think that I’ve actually got on in a gazillion pieces, need to pull my finger out
Cheers
Wayne


Sent from my iPhone using Tapatalk

[AlwynTurner]

Now for the barrel/turret

Got the recoil parts from Tankbear (thank you Ian)

They fit the barrel holder

used the smallest cog on a standard 9gm servo

It needed a little bit of fettling to position correctly

Glued the barrel together with the brass tube

gorilla glue is the answer here because it expands slightly

Printed the fasteners to hold in the barrel to the mounting


Just have to assemble in the elevation and turret rotation motors

Alwyn

[AlwynTurner]

Elevation motor mounted and tested



Mounting bracket


Just the rotation motor to do

Alwyn

[midlife306]

Nice one Alwyn
Have you got the scad for the spring mount?
I see you’ve added some plasticard to the top of the turret, is that to help with the blend into the top?
Cheers
Wayne


Sent from my iPhone using Tapatalk