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1929 AC 5t Dump Restoration


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I wondered how you were doing. Last post had the chassis primed and on wheels outside you shop.

How long and cost on the #D printing?    Paul

Edited by 41chevy

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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10 hours ago, 41chevy said:

I wondered how you were doing. Last post had the chassis primed and on wheels outside you shop.

How long and cost on the #D printing?    Paul

Dan has not sent me the bill yet!

But the way he went about making the patterns was fascinating. First, he chopped out the rotten buts then set them up on a rotating table before scanning them with a laser scanner to form a 3d digital image. He then "cleaned up" the image to create a digital 3d image of what the repair part should look like. He then scaled it to account for the shrinkage when the part was cast before 3d printing the pattern using a foam that burns away as the molten metal is poured in. A simple sand mould casting was then pretty easy. He tells me that one of the advantages of the "lost" foam is that it tends to smooth out the casting surface - much more like die casting.

I will ask him how long it took.

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3 hours ago, paulbrook said:

Dan has not sent me the bill yet!

But the way he went about making the patterns was fascinating. First, he chopped out the rotten buts then set them up on a rotating table before scanning them with a laser scanner to form a 3d digital image. He then "cleaned up" the image to create a digital 3d image of what the repair part should look like. He then scaled it to account for the shrinkage when the part was cast before 3d printing the pattern using a foam that burns away as the molten metal is poured in. A simple sand mould casting was then pretty easy. He tells me that one of the advantages of the "lost" foam is that it tends to smooth out the casting surface - much more like die casting.

I will ask him how long it took.

I'd appreciate that. I did see the Cummins water pump housing for the 1940's Indy car that was 3D metal printed and held a few Mercedes metal printed  parts for a 300.  Sounds like a good possibilty for a few of my Packard parts.

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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5 minutes ago, ekennedy21 said:

There was no place for it in their lineup. They put their eggs in the V8 basket for big power. Unfortunately, economies of scale come into play in production and more offerings equate to higher prices all the way through.

Myself I’d rather had the V8. 

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On ‎7‎/‎3‎/‎2019 at 8:00 PM, 41chevy said:

I'd appreciate that. I did see the Cummins water pump housing for the 1940's Indy car that was 3D metal printed and held a few Mercedes metal printed  parts for a 300.  Sounds like a good possibilty for a few of my Packard parts.

I did not know you had a Packard. I have been dallying around buying a WW1 5t Packard from a guy I know in France for a few years now - but never plucked up the courage (besides I have too many projects as it is!). The 3d stuff that Dan is specialising in is a kind of half-way house: rather than try and print the final part he is printing the pattern from which a part can be cast, which makes it really cost effective. Many foundries can now print patterns, so if we want something casting out of some exotiv material we can simply email the file for the pattern to the foundry and they can then do a one off at little more than the cost of actually casting the thing.

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11 hours ago, fxfymn said:

Gary Mahan has had reproduction tanks made. Might be worth checking with him.

We were going to try that, but actually what we have now is the original but (virtually invisibly) repaired. On these old trucks much is so simple to make, like the cab, but over the years I have tended to want to try and use an original replacement or repair the original part if I can, even if that is harder than just, say, cutting a new cab side out of a sheet of metal.

That said, sometimes only new will do!

 

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On ‎7‎/‎4‎/‎2019 at 4:01 AM, yarnall said:

Good work.  I’d like to know what a tank like that would cost. I paid $1000 for a good use one and was glad to find it but would have liked to pay less.  Yours looks nicer.    Mike. 

All up I would guess about $3-400 for all this (like I say, I have not seen the bill yet!) but that involved all the set-up work. Now he has the files digitally I guess that subsequent repair sections would be much cheaper. We have done some work on another project (a WW2 Armored car) that is very rare. There is a similar one being restored by a group over on your side of the pond and we have been able to share all sorts of digital files which they can take to their local laser cutters, machine shop or foundry. I say take - they can email the files with the click of a mouse and the finished parts simply arrive in the post.

That's what happens when you get some of these clever young folks involved

 

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9 hours ago, paulbrook said:

I did not know you had a Packard. I have been dallying around buying a WW1 5t Packard from a guy I know in France for a few years now - but never plucked up the courage (besides I have too many projects as it is!). The 3d stuff that Dan is specialising in is a kind of half-way house: rather than try and print the final part he is printing the pattern from which a part can be cast, which makes it really cost effective. Many foundries can now print patterns, so if we want something casting out of some exotiv material we can simply email the file for the pattern to the foundry and they can then do a one off at little more than the cost of actually casting the thing.

https://www.bigmacktrucks.com/topic/55276-new-tow-rtruck/?tab=comments#comment-413074

 

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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Great job!

Honestly if I were doing such fixing i would worry about the welded areas on possible leaks, cracking in the future etc. So purchasing a completely new cast part makes sence. On the other hand such repair is much more interesting entertainment. And if all go smooth you will be prouder and keep the fun.

Никогда не бывает слишком много грузовиков! leversole 11.2012

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1 hour ago, Vladislav said:

Great job!

Honestly if I were doing such fixing i would worry about the welded areas on possible leaks, cracking in the future etc. So purchasing a completely new cast part makes sence. On the other hand such repair is much more interesting entertainment. And if all go smooth you will be prouder and keep the fun.

One thing's for sure - Dan's welds don't leak! He is a structural design engineer in the nuclear industry and really knows his stuff but also has a small company that do "impossible" engineering. So I think that the tank will be good for a hundred years or so.  He did talk me through casting a new tank, and there is plenty that can go wrong with that too!

Here is another of his masterpieces

 

20170507_145936.jpg

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(concrete delivery driver, ranting about DIY engineers) I've found that with engineers they usually think they know everything, but when push comes to shove they tend to be controlling of those of us who know how to do our jobs, which slows me down from getting their delivery done so I can keep my schedule. Concrete in particular you just have to jump in and get it done. It's labor intensive, and there's no way around that sometimes.

 

But that radiator looks great! Dan has talent! If he welded it himself I'm doubly impressed, engineering theory is one thing, but the skill to make it happen requires a different talent.  Haven't met many engineers with both.

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  • 1 month later...
On ‎7‎/‎6‎/‎2019 at 1:19 AM, JoeH said:

(concrete delivery driver, ranting about DIY engineers) I've found that with engineers they usually think they know everything, but when push comes to shove they tend to be controlling of those of us who know how to do our jobs, which slows me down from getting their delivery done so I can keep my schedule. Concrete in particular you just have to jump in and get it done. It's labor intensive, and there's no way around that sometimes.

 

But that radiator looks great! Dan has talent! If he welded it himself I'm doubly impressed, engineering theory is one thing, but the skill to make it happen requires a different talent.  Haven't met many engineers with both.

His latest bit of work for me, machining the AC flywheel to take a starter ring gear, can be seen here. Before doing it he had to adapt both the chuck and the gap block.

 

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