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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31877

....and he's back on it again :woohoo:

I love watching you make this stuff Jonny!

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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31881

How about plastic drain pipe or something for the tank?

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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31882

How about plastic drain pipe or something for the tank?


I did look into that, but the cost, wall thickness & being a different plastic (so potentially issues with joining it) put me right off ...

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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31883

I knew there was a good reason why I should make the baffles ring shaped rather than solid, but it escaped me, so I left them solid ... then realised if they were rings, it would make fixing the skin on so much easier if I could put the DCM on from the inside.

Due to the angle it doesn't look it, but this is the centre - measure diameter (142mm), set compass to 1/2 that, run two arcs from the edge & where they cross is the centre, 3rd is just to check.






After a lot of dremelling (I didn't need access through the centre baffle, so left it alone) & gluing the 1st later of 0.5mm sheet:








That did leave the outside surface a bit wobbly, but a 2nd layer smoothed things out considerably:






Cutting through the 1st layer for the wheel insets:





Bonding the two layers around the openings:






2nd layer cut through:







Wheelarches/liners are setting ATM, I've also been giving the ends of the tank some thought ... they ought to be dome shaped, I'll have a look around & if I can find something the right profile there are a few options (crash forming, casting, vacuum forming), if not they'll have to just be flat bits of sheet.

:)
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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31912

I decided to do the tank ends flat in the end ... not ruling out making a vacformer at some point in the future, just not yet ... besides which, you need to have something to form over, and if I could make a shallow dome I wouldn't need to vacform it :whistle: I did look at getting a few different size clock glasses & taking a cast off the inside, but it's a look of expense & faffing about I can avoid by just doing them flat...





Mudguards are a bit of a compromise, thin enough to take the right arc means they're too thin to hold a 90 degree edge...




... I did have the cunning plan of taping the edges at the right angle & then heating it to relax the plastic, but you can see how well that worked:





Not a pregnancy test stick for elephants, this is the start of the drawbar (very abbreviated chassis):






Axle is made from layers of styrene, some drilled 10mm for bearings, most just 5mm here:





I had to hoover myself too :whistle:










:)
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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31919

Good work JR :)
If you can't fix it with a hammer, you've got an electrical problem mate :)
The following user(s) Liked this: Jonny Retro

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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31933

Basic construction done - it's "just" details & paint from here on...

Tank pivots around axle at the rear & is sprung at the front a la 1:1 tanker, spring seats are de-chromed & cut down Lunchbox shock bodies. Angle is a bit much at 7 degrees vs the models' 5 degree tilt, either this will decrease as the weight increases or I'll have to find shorter/softer springs; tow hitch is a bit of a lash up but may not improve that much :whistle:

I'm reasonably happy with the size, there's some bits to hang off the rear & increase the height a bit so the proportions will change (improve IMO) as this goes on, but I'm quite clear that the twice as long/twice the diameter dimensions of the tank that a "correct" build would have required would have been silly :)






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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31936

HI JR,
This is looking good, but have you tested with a wider wheelbase?
To me, the wheelbase looks a bit on the narrow side.
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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31937

It's 226mm wide, in proportion with the rest of the tanker - it's the tractor that's "wrong" :)

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1979 Fiat Trattori 880 DT Pininfarina build 9 years 4 months ago #31938

It's 226mm wide, in proportion with the rest of the tanker - it's the tractor that's "wrong" :)

Ah, ok. Still, for the pair, I think a wider wheelbase would suit it ;)
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