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The second group of prototypes, shown above, was produced approximately 20 years later and
is part of the early design explorations of the new Lee Valley
premium block plane, released November 2008. Drawn by Steve
Jones, a senior industrial designer and part of the now much-larger
Lee Valley research and design group, the computer-drawn 3D
renderings allow for the development of different versions
and textures by using the keyboard as the palette. These drawings
always have a separate reference scale inserted to reflect
the true size of the object. Each variation was examined on
screen and on paper printouts, which meant the prototypes
could be grouped and compared without requiring a fabricated
model.
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As
the design progressed, these models were produced straight
from the computer using a system known as rapid prototyping.
It can be used to produce true mockups that, at the change
of a keystroke, are scalable and can replicate the feel and
size of the intended product. The rapid prototyping machine
is essentially a 3D photocopier that sprays a fast-setting
plastic to build up a model in layers. Newer forms of this
machine use metal powders in conjunction with the fast-setting
thermoplastics. The final designs are often sent as computer
files to suppliers for preproduction of a part or section.
If needed, the required scaling and draft angles for a casting
can be computed and added immediately, depending on material
selection. Machining to final specifications can also be done
from the original computer drawings without generating any
paper. Prior to the acceptance of a final design, a true working
model may and should be constructed in the older, traditional
manner so that a true representation can be held and examined.
The validation of a design is as important as the design concept.
Although radically different, both systems have an important
place in today's competitive manufacturing environment. One
exemplifies how manufactured objects were developed for over
200 years. It relied on numerous disciplined trades to further
a concept. The newer approach is a reflection of how the computer
has altered design parameters in the manufacturing arena;
however, the same skilled persons are still required but
their talents are used in a different sequence.
D.S. Orr
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