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Thread: Modern-day Miura

  1. #181
    Senior Member 275NART's Avatar
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    Really like how your'e tackling the doors. I'm taking notes...

  2. #182
    Senior Member C5GTO's Avatar
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    Post Station buck hammer forms

    I bumped into an old friend one day and he mentioned that he'd built himself a CNC router in his garage. Hearing this, I immediately asked him for a favor, provided him the CAD files and soon I had another piece to the station buck puzzle. He made me hammer forms in MDF for the vents situated in the top middle of the hood.




    These started from 3 layers of 3/4" MDF glued together and then shaped on a CNC router. Like the other parts of the station buck, these fit perfect with the top surfaces aligned as they should be. You sure can't beat this CAD stuff for accuracy.

    The headlight opening hammer forms were then shaped and installed on station buck.



    Next up, the front grill opening. This one is big and complicated. It might take a while to get done.
    Joel Heinke
    Be original; don't be afraid of being bold!

  3. #183
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    Looks like some prehistoric skeleton at the dinosaur museum. LOL

  4. #184
    Senior Member C5GTO's Avatar
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    Post Front Clip Substructure (cont.)

    The build out on the front clip substructure continues. In books Iíve read about structural engineering, itís said that the strongest geometric shape is the triangle. So I always try to design in triangles where I can. This substructure is long and wide, will likely have a decent amount of down pressure on it at highway speeds and so I put a triangle across the longest part of it.







    The hinges are working well so far and substructure lifts and lowers easily.
    Joel Heinke
    Be original; don't be afraid of being bold!

  5. #185
    Senior Member C5GTO's Avatar
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    Post Front Clip Substructure (cont.)

    More triangles added to the sub-structure.





    My objective with this triangulation is to minimize the twist when the front clip is raised. The fuel fill will be under the front clip (i.e. not externally accessible), the front clip will be raised by a single person the majority of the time and thus a twisting motion will be placed on the front clip for every fuel fill. The front clip substructure is wide and fairly flat. So Iím trying to design the front clip substructure to be lifted with a minimum amount of twist being transmitted through to the skin.

    Fabricating these triangulation members took quite a bit of time. Firstly because of the odd angles that were needed at each end and secondly because I had to make them twice. My first attempt was failed because the triangulation tubes came in contact with the upper chassis tubes prior to the front clip being completely raised. So I had many trips to the belt sander to fine tune the angled fit up by the time I had good pieces to weld in.



    Thereís now a whole ľĒ of clearance as the front clip substructure is fully tilted up.
    Joel Heinke
    Be original; don't be afraid of being bold!

  6. #186
    Senior Member TRcrazy's Avatar
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    Coming along great Joel !!
    ,
    ,
    Vinny
    Remember, there is always next year.

  7. #187
    Senior Member C5GTO's Avatar
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    Post Front Clip Substructure (cont.)

    I started fabricating the rear part of the front clip sub-structure, the part that runs transverse to the chassis. The main consideration was to provide good mounting surfaces for the two latch pins and provide good support for the vertical members to be located behind the front wheel openings. Given these considerations, I went with a forked design so that a vertical member could be placed just behind the wheel opening and another at the front clip rear edge.



    To maximize cowl clearance, the transverse sub-structure members were bent to the adjacent body shape using a bottle jack pipe bender. I was able to check the shape for these against the station buck. An additional tube was located below the top longitudinal member to provide triangulation support.



    Using the buck station for the front edge of the door, I created a cardboard template to verify the sub-structure is located within the body skin envelope.



    Latch pin mounts are started but still require some tubes to be cut and welded to sub-structure prior to being complete.





    Iím using the dual hood latches, cables, and hood release lever from the C4 Corvette. I might need to outfit the latch pins with lighter release springs as I want to be able to close the front clip by simply dropping it versus pressing down on the body skin. I wonít know if the Corvette release springs are too heavy until I get further along to find out how much front clip weight will be coming down on the latches.

    Thereís not much clearance between the sub-structure and the windshield wipers arms.



    I purposely designed the sub-structure with this close fit as it needs to provide support for the body skin all the way across the windshield width. One of the next steps is to add a way for the front skin to be attached to sub-structure across the windshield bottom in a way that provides good support across this wide opening.
    Joel Heinke
    Be original; don't be afraid of being bold!

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