Chieftain ARRV mk 7

[FredtheFrench]

Very nice model. This scratch model is awesome.

I hope to see a video in few weeks...

[PainlessWolf]

Doc,
I just noticed that you went to Walker type tracks. Do they run better installed backwards or is it an appearance issue? The whole vehicle is beautiful in an industrial manner, much like a Sherman tank. That you built it flat out from basic parts and sheet styrene is and always will be amazing.
regards,
Painless

[wibblywobbly]

To be honest I have had the tracks on and off so many times, I must have put them on the wrong way around after I painted the rubber paint onto the road wheels, I will attend to this, so thanks for mentioining it. I 'simply placed it back on the sideboard and haven't really looked at it since I started the latest build.

RobG

[DNAR]

Tom, I get the same idea, there are some incredible builds going on, on this site. I check up on them regularly even if I don't always leave a comment, it's great to see so many people getting into this.

Pete, thanks for the links, I have never seen those units before, having offset vertical drives may enable me to save space and get the mechanics working. The shovel should be fairly easy, just two (one lift one rotate), but the crane will be a challenge. If push comes to shove (excuse the very poor pun) I would rather have a functional shovel than a crane. I only have a 6 channel radio, so I am going to be pushing things with fully functional everything.

What makes my hair stand on end is the detail on the crane, and what lurks behind the shovel. It will probably be a case of build the detail in styrene, but have a simpler, stronger, system for operating. The 1/35 scale guys must be on drugs to do what they achieve.

wibblywobbly: I see that you have seen my work in 1/35 and posted it here mate. Its the second picture with the full Atlas Crane scratch built. This is maximising the detail as the one in Accurate Armour is not that great. Much respect for doing this ARRV mk 7 in 1/16.

[wibblywobbly]

Thank you for the compliment, but I throw myself at your feet sir, I am not worthy. Your work is truly astounding, I struggle with small 1/16 parts, so how you achieve what you do in the smaller scales is something that I just stare at in awe.

Rob

[wibblywobbly]

Having seen Alwyn's work on the Chieftain suspension units, I kept looking at my ARRV and thinking that I could retrofit them. There are two issues:

1. I used a KV1 lower hull as it is roughly the same size. This was all done in the days before 3D printers so I took the most robust route.
2. I used Bulldog/Pershing road wheels, and Bulldog tracks, as this was the easiest way to make it all fit and line up.

So, Alwyns units are the right size, but they are designed for the 3D wheels and tyres.

I rejigged the units in Openscad, and designed them to dispense with a few bolts and use stainless rod for hinge points, The back of the units is now flat to fit the KV1 hull.

I haven't printed them yet, and will need fine tuning if I do, I am still working on the JS3, but I with what I have learnt over the years in Openscad I intend returnng to the ARRV at some point to do the suspension, wheels, idler, sprocket, and a shovel that works more like the original. I may even have a go at a fully operating crane but space is really tight for that.

susp.png (28.83 KiB) Viewed 5184 times

suspension();
suspensionarm();
mirror([1,0,0])suspensionarm();
springmount();
mirror([1,0,0])springmount();
//*****************
module suspension()
{
$fn=100;
difference()
{
union()
{
hull()
{
translate ([-22.5,12.5,25.75])rotate([0,90,0])cylinder(45,5,5);
translate ([-22.5,1.5,25.75])cube([45,11,5]);
translate ([-22.5,1.5,7])cube([45,16,10]);
}
translate ([-13,1.5,-2])cube([26,16,10]);
translate ([-7,17.5,-2])rotate([90,0,0])cylinder(16,6,6);
translate ([7,17.5,-2])rotate ([90,0,0])cylinder(16,6,6);
translate ([-7,18.25,-3])rotate([90,0,0]) cylinder(1,2,2);
translate ([7,18.25,-3])rotate([90,0,0]) cylinder(1,2,2);
translate ([0,18,27])rotate([90,0,0])color("red")cylinder (12,7,7);
translate ([0,23.5,27])rotate([90,0,0])color("red")cylinder( 5.5,4.5,7);
}
translate ([-22.5,18,6.5])rotate([90,0,0])cylinder(20,9.5,9.5);
translate ([22.5,18,6.5])rotate([90,0,0])cylinder(20,9.5,9.5);
translate ([-30,3.5,-14])cube([63,12,30]);
translate ([-7,19,-3])rotate([90,0,0]) cylinder(33,1,1);
translate ([7,19,-3])rotate([90,0,0]) cylinder(33,1,1);
translate ([0,24.5,27])rotate([90,0,0]) cylinder(22,1.5,1.5);//top
}
damper();
mirror([1,0,0])damper();
}
//********************
module damper()
{
$fn=100;
difference()
{
union()
{
hull()
{
translate ([22.5,15,25])rotate([90,0,0])cylinder(10,7,7);
translate ([24,15,30])rotate([90,0,0])cylinder(10,3,3);
}
translate ([25.5,16,26])rotate([90,0,0])cylinder(12,2,2);
}
translate ([22.5,11.25,25])rotate([90,0,0])cylinder(3,17.2,17.2);
}
}
//********************
module suspensionarm()
{
$fn=100;
difference ()
{
union ()
{
hull()
{
translate ([7,15.25,-3]) rotate ([90,0,0]) cylinder(11.5,5,5);
translate ([31,15.25,-3]) rotate ([90,0,0]) cylinder(11.5,5,5);
}
translate ([31,17,-3]) rotate ([90,0,0]) cylinder(13,5,5);
translate ([31,22.5,-3]) rotate ([90,0,0]) cylinder(6,5,5);

hull()
{
translate ([22,13.5,2]) rotate ([90,0,0]) cylinder(8,1.5,1.5);
translate ([23.5,13.5,11]) rotate ([90,0,0]) cylinder(8,1.5,1.5);
translate ([29,13.5,2]) rotate ([90,0,0]) cylinder(8,1.5,1.5);
}
translate ([23,13.5,10]) rotate ([90,0,0]) cylinder(8,2.5,2.5);
}
translate ([7,25.5,-3]) rotate ([90,0,0]) cylinder(40,1.5,1.5);
translate ([31,23.5,-3]) rotate ([90,0,0]) cylinder(40,1.5,1.5);
translate ([23,24.5,10]) rotate ([90,0,0]) cylinder(20,1,1);
translate ([23,11.25,10]) rotate ([90,0,0]) cylinder(3.5,5,5);//cut out
}
}
//************************
module springmount()
{
$fn=100;
difference()
{
union()
{
translate ([23,11,10]) rotate([90,0,0]) cylinder(3,3,3);
translate ([19.25,8,7])cube([4,3,6]);
translate ([18,9.5,10])rotate([0,90,0]) cylinder(2,6,6);
translate ([9,9.5,10])rotate([0,90,0]) cylinder(10,5,5);
}
translate ([23,15,10])rotate([90,0,0]) cylinder(16,1,1);
translate ([7,9.5,10])rotate([0,90,0]) cylinder(10,3.5,3.5);
}
}