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  #11  
Old 03-27-2015, 05:52 PM
John Buchtenkirch John Buchtenkirch is offline
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If its going to be a convertible Id consider adding an X-member to the frame otherwise the doors will bang on the door locks when you hit pot holes or drive into driveways at an angle. ~ John Buchtenkirch
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  #12  
Old 03-27-2015, 08:45 PM
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RockHillWill RockHillWill is offline
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John, I understand your concern. It is my opinion that "X" bracing in the floor will contribute more to controlling torsional flex , but will do a lessor amount in the 'truss' concerns that you spoke of.

A convertible of this wheelbase and the large doors is a genuine concern for the 'truss' issue. I have seen much of Jims work in the wood body mounting pieces and know he has a very good handle in that area of concern, so I will be more concerned beneath the door areas of the frame.

Current thoughts are to make 'outriggers' outboard of the ladder frame in the door area, make sure that the 'x' bracing that is inboard of the ladder frame extends both forward and rearward of the door posts, and I am making some sketches that that incorporate both the (3) hinge approach to the doors as well as a latch that is similar to the Model A (Oh, My Gosh ) door closers that are a ramp/wedge design that positions the latch. I feel that I can trap the latch and reinforce the top door area and mitigate the structural deformation in that area.

I am of the opinion that there is much to learn from both the monocoque and the superlegerra approaches to strength vs weight and there are many auto designs that incorporate a combination of those approaches.
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  #13  
Old 07-07-2015, 08:05 PM
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RockHillWill RockHillWill is offline
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Just got back this week from a trip to Jim Hery's Chalfant Motor Cars shop in Tennessee where we were working on 3D scanning the T57 Stelvio that Jim is restoring, in an effort to gather as much info as possible while the Bugatti is in 'captivity'.

We removed the body (transmission and clutch) to get a better view for scanning. University of Pennsylvania Professor Scott White and his brother Sean came in from Philly and did the actual scanning. We all took turns applying the 'targets' after the body, etc. was removed.

I took advantage of the clear vision to make sketches for fabricating the cowl/body mounting brackets and the dash mounting brackets and the gas tank.

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  #14  
Old 07-08-2015, 06:28 AM
Gojeep Gojeep is offline
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So good that this type of technology can be used to preserve these old cars for future builds.
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  #15  
Old 08-22-2015, 11:45 AM
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Here are some SolidWorks drawings for the gas tank for Jim's Bugatti project. We took actual dimensions from the original tank as it was is pretty good shape, at least for measuring. The last drawing is the SolidWorks assembly drawing for the muffler. It is 5" in diameter and five feet long
and the dimensions were extrapolated form drawings in an original Bugatti service manual. All the pieces have been cut on the water jet, including the rubber support 'hangers', with the exception of the two pipes/tubes.

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  #16  
Old 08-23-2015, 02:35 PM
Hansa1100 Hansa1100 is offline
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Really cool stuff!

But are you going for an exact copy now, or more your own interpretation? Or a kind of hot rod?

Sorry if you have answered this in other threads
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  #17  
Old 08-23-2015, 04:11 PM
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RockHillWill RockHillWill is offline
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Jim is determined to make this as authentic as possible, and we are using actual documentation, digital measuring and of course the 3D scanning is involved, resulting in extreme accuracy. This statement is usually responded to with some referral to 'better than original', or 'it needs to stay original', etc, but this is Jim's intent and I going to help any way that I can. I spent the better part of an hour or so measuring and taking photos of the original gas tank, and with Jim's prolific history on this type of high level restoration, I am expecting first class results.
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  #18  
Old 08-23-2015, 10:41 PM
Ranchero50 Ranchero50 is offline
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Fascinating stuff. I do wonder about all the targets. Where I work we print the National Geographic magazine and in a past issue they did a digital scan of a structure and it did the scan in the rough from several vantage points and the details were amazingly accurate.

We have also had folks from Oasis Alignment come in and optically check the alignment on our four story tall 200' long presses and they can dimension to thousandths of an inch over 100' of printing units.

I love that you guys are making digital masters of the chassis and bodies of the cars. Really amazing work.
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  #19  
Old 08-24-2015, 07:36 AM
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RockHillWill RockHillWill is offline
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I too, have seen digital scanners that do not use the 'targets' in this manner, but this is a very accurate and valuable style that is available to the gentleman that is doing the scanning.
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  #20  
Old 08-24-2015, 03:31 PM
cameron cameron is offline
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Will,

I don't understand your reply to John Buchenkirk's post #11.

Surely, dropping one wheel into a pothole or running one wheel up onto a driveway will put a torsional moment on the chassis?

Dave Cameron
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