Centurion Mk III Scratch build

[AlwynTurner]

I'm just assembling the suspension and the wheel spacing is all wrong, I think I'll have to shorten the swing arms on the suspension by 3mm to give the correct wheel spacing. I'll experiment and post pics when I've finished printing the tyres.

Alwyn

[AlwynTurner]

Here is a photo of a Centurion

and here is what the current set up looks like


The wheels are too far apart on the suspension unit and too close together between the suspension units. The only solution is going to be to shorten the swing arms to get the gaps corect. It's a straightforward fix, it just requires more printing!!

Alwyn

[midlife306]

Hi Alwyn, could you not just move the hole positions closer together on the suspension units?
Cheers
Wayne

Edit, I think it’s quite important to keep the arms as long as poss to maximise suspension travel

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[AlwynTurner]

HHi Wayne, no there is no space between the pivot points to allow that

To make the space bigger would require making the swing arms thinner, which would weaken them too much. Better just o shorten them by 3mm. It's an easy retrofit, just means reprinting the arms.

Alwyn

[midlife306]

No worries Alwyn, it’s all part of the entertainment
Cheers
Wayne


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[AlwynTurner]

I've just checked against the 1/35 model and if I shorten the arm by 3mm it will be exactly to scale. It just shows that the suspension design changed subtly between the Centurion and the Chieftain

Alwyn

[AlwynTurner]

Modified the scad and reprinted

The spacing is now correct on the right hand side pair of wheels.

Now I just have to print another 5 sets. This reminds me of the Red Queens Race from Alice in Wonderland, running as fast as you can to stay in the same place! (or in this case printing as fast as I can)

Alwyn

[midlife306]

Nice one Alwyn
Cheers
Wayne


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[AlwynTurner]

I finally sorted the wheel spacing AT LAST! A days printing later it looks as it should.


Obviously when they designed the Chieftain they took the opportunity to get greater suspension travel by lengthening the swing arms. That is just a reminder to me not to assume (makes an ASS out of U and ME - particularly me) so now I shall be rechecking everything before printing.

The only good part of this is I have a set of Chieftain swing arms should I decide to build another.

Alwyn

[AlwynTurner]

Hi Mick, the positioning is all scaled from the 1/35 model, so as far as my measure 3 times current policy goes, it should be in exactly the right place (fingers crossed).

Thanks for the check though.

ALWYN