Initially started stump shrinking with a mallet that was too pointy for the task, also may have been hitting too hard. This created a crack in the bowl.
To even out, stretch and smooth the inner section of the reverse curve, I decided to see how an English wheel would affect the material. I swapped out the bottom wheel for another with a higher crown, the highest crown available as this is a small piece of metal so I wanted a minimal contact patch. After only a few light passes through the English wheel, the central arc was widened, smoothed and slightly more aligned. I began to work on stretching and forming the metal using various metal anvil-like objects that were scattered around the workshop. Got up to this stage when I was informed that there was staff CNC training so I had to leave. Will hammer out the final parts another day.
This tutorial will cover the group and individual processes undertaken to create a scale model aluminium skin of a Ferrari 250 GTO (pictured above). The first task is to create a 'buck'. A buck is the mould, or skeleton that the aluminium panels will be tested on to look for imperfections in the panels that require further attention. The aim is to have all panels fit snug when applied to the buck, with edges of panels meeting flush. To begin making the buck, download the available .STL model, import into a slicing program. The idea behind the slicing is to create a series of sections running along an X & Y axis that can fit together to give a suggested shape. An appropriate slicing program would be Autodesk's Fusion 360, which is free for students. With the .STL file imported, select the number of slices requires on the X & Y planes, then select 'get plans'. This will allow you to export a file with 2D vector lines of each of the panels that wil...
The aim of this task was to form a 'blister' in a piece of sheet aluminium. To do this, a teardrop shape was cut out of two MDF boards, the sheet aluminium was placed between them and all fastened securely with four nuts and bolts in the corners. With the sheet aluminum secured in place, the blistering technique began. A small end of an egg shaped mallet was used first to form an edge to work with. Substantial stretching of the inner section, a sign of a quality blister. Excess material has been trimmed off. Edges were lightly filed and then sanded to finish. C'est magnifique.
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