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Wheeling machine - excercises: #1 Shape in- shape out

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  • Wheeling machine - excercises: #1 Shape in- shape out

    Shape-in Shape-out

    (A daily excercise for the Aston Martin apprentice)

    In this excercise a flat piece of metal is shaped into a dome by streching the center, and in a later stage the dome will be flatted fully bij streching the outer edge. The goal is te get to a flat, even and tention free panel only using the wheeling machine. Although not that difficult at first (geting the dome in), the challengs lays in getting the panel flat afterwards with no tention.

    (This excercise uses wording explained at the "Wheeling machine - excercises: General information" topic)

    Material needed: a piece of aluminium 30 x 30 cm (12"x12") 1.5mm thick.

    Standard preparation:
    - Deburr and wipe off the panel (with thinners)
    - With low pressure, perform a whash over

    Excercise:

    Shape-in
    1) Starting with normal pressure working left to right (or right to left) and make passes in a standard tracing pattern, all passes of equal lenght, NOT touching the outer 2,5 cm (1"). The outer edge is off limits (at this Shap-in stage)
    2) turn the panel 90 degrees and repeat step 1 resulting in a cross standard tracing pattern.
    (the tracking should be very close together as the striking width of the anvil is not wide. Try to overlap the tracking in an even and constant way).
    Click image for larger version

Name:	Standard track second pass not to edge.png
Views:	97
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ID:	1925

    As the outer edge is untouched, it is not streched, the inner part is streched, forcing it up. At this stage the panel wil rise next to the edge, but not that much in the center leaving the center real flat:
    Click image for larger version  Name:	curve 1.png Views:	0 Size:	836 Bytes ID:	1922
    The reason is that because of the standard tracking pattern, the place where the passes stop (2,5cm from the edge give or take) , the passes are on top of eachother, and in the middle they are more next to each other. Therefore the ends receive more "strikes" than the middel, resulting in more strech in the towards the pass ends:


    To get the center up, continue in a staggered tracing pattern, altenating short and long passes. Turning 90 degreed and repeat to get a cross pattern.
    Due to this staggered pattern, the center recieves more passes (and thus receiving more "strikes"). The following profile will emerge:
    Click image for larger version  Name:	curve 2.png Views:	0 Size:	1.0 KB ID:	1924
    In real life:
    Click image for larger version  Name:	shape-in.jpeg Views:	1 Size:	135.6 KB ID:	1911

    The next phase is to flatten the panel back to full square/flat:

    Shape-Out
    (the real excercise steps for this phase will be inserted at this post at a later time).

    and from dome shape to fully flat:
    Click image for larger version  Name:	shape-out.jpeg Views:	1 Size:	125.1 KB ID:	1912
    Last edited by johnmar; 10-20-2019, 03:07 PM.

  • #2
    Very good ! This will help some beginners understand the proper way to wheel and how to get rid of shape if needed
    Peter T.

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