Craftsmanship is core of Bentley
Producing a Bentley means maintaining critical tolerances,
involving precision tooling and skilled operators all of whom
combine to achieve dizzy levels of dimensional accuracy and
integrity. Such attention to detail and craftsmanship of the
whole manufacturing process makes a Bentley the prized
possession of a car lover, says Visvas Paul D Karra after
visiting the plant in Crewe, England
Bentley is all about providing individual care and attention,
not only at the production level of the car but also in catering
to the bespoke demands of customers. Every car is made to order
and involves exquisite craftsmanship, just like in the olden
days when every Bentley that was on the road used to be unique
piece of style and motion designed and built by clever
coachbuilders. The capacity for speed is an attractive attribute
in a Bentley, but in manufacturing the finest motor cars, the
quest for perfection cannot be hurried. It takes some eight days
to achieve the level of finish and body protection synonymous
with these vehicles.
One of the interesting aspects of producing a Bentley is that
technology has been harnessed for speed, but all the core skills
remain in the hands of humans. For instance, every Bentley’s
interior veneer is unique as it is marked with the chassis
number of the car for which it is intended. It takes 13 days to
produce a set of veneers for one Bentley with 80 craftsmen
working in the Wood Shop.
The distinctive burr walnut pattern is produced over years by a
fungus, which affects the root ball, and become more valuable
than the trees, which have passed their best as fruit producers.
Every tree felled is replaced by another. Burr walnut is the
most familiar but by no means the only veneer used at Crewe.
English oak is also available, as is the increasingly rare elm,
and the company has introduced two woods, madrona and vavona.
Endangered varieties such as mahogany are not used. Birds eye
maple is another wood to provide a distinctive grainy pattern,
though it is also the hardest to work with. Some customers opt
for straight-grain walnut veneers, and solid walnut is used for
parts of the car, such as the waist rails.
It is the job of Veneer Selector Adrian Minshull to travel
to Italy and elsewhere to meet the importers of root balls. He
can provide an accurate estimate of how many car interiors can
be veneered once the ball has been sliced into 0.6mm leaves.
The Wood Shop uses 16 leaves to create the 26 central components
in a Bentley, plus another eight for the waist rails. Options
such as picnic tables or additional door panels could bring the
veneer used in a Bentley to as much as 6.5sq m (21.3sq ft).
Making full use of the recurring pattern throughout the root or
log, the leaves are doubled up to create a mirror-image effect.
For example, four leaves are taped end to end to form a
symmetrical pattern across the centreline of the facia, and this
pattern is matched and echoed in the console to create a
cascading effect throughout the vehicle. The waist rails also
mirror each other, with the same pattern repeated on each door.
Accuracy and integrity
Precision engineering is evident in the state-of-the-art
Body Assembly Hall at Crewe. Where gaps are required between
steel panels, for example, they are uniform, set at exactly
Four-axis measuring machines check no fewer than 2,500 measuring
points. In addition, the achievement of joints between body
panels that are almost invisible is the result of abandoning
standard “hot weld” technology, which can cause distortion of
panels at the weld points. Instead, Crewe has adopted
plasma-brazing “cold weld” technology, which leaves a pristine
finish ready for painting.
Behind orange safety curtains, the plasma-welding teams can be
seen at work on the major body assemblies. Elsewhere in the
hall, suspended computer-controlled guns are used to assemble
body sections mounted on jigs. These hand-held tools allow
accurate positioning of the 6,500 spot welds required to
optimise torsional rigidity on each monocoque steel bodyshell.
No other manufacturer goes in for spot-welding on this scale.
The visitor will notice that although there are fans to blow any
fumes away from the welders, they raise only the lightest
breeze. That is to avoid blowing dust around the Body Assembly
Hall which, like every other area at Crewe, is conspicuously
clean. Between 540 and 560 components are used to construct each
body. By the time each one leaves the assembly hall, it will
incorporate some 3m of MIG wire, 1.5m of brazing, and about 200
It takes about three weeks to turn those 540-odd components into
a complete, inspected bodyshell ready to go on to the next
stage. Working a single eight-hour shift, the teams currently
send 35 bodies on their way to the paintshop each week. And as
each body goes on its way, it is already earmarked for one
The bare metal bodies pass through 16 stages of development
and 120 separate processes before they depart in a state of
gleaming perfection. There are 26 standard and a number of
non-standard colours but since the latest product launch, 111
colours were individually matched. The paint shop is often asked
to match a colour - to a bottle of nail lacquer or even a pink
“Ninety per cent of the materials applied to our car bodies are
concerned solely with protection and ensuring a durable finish,”
says John McNicholas, Zone Manager in the Auto Paint Shop. The
other 10 per cent is about aesthetics. But what aesthetics! The
first thing you notice when you look at a Bentley is how lovely
the paintwork looks.
A process that can take eight days is telescoped into less than
an hour when you walk alongside the conveyors in the Paint Shop
at Crewe (there are 2.2 miles of track altogether!). Here, in
one of the most advanced facilities of its kind, a procession of
bodies arrive in bare white metal and will pass through 16
stages of development and 120 separate processes before they are
ready to depart in a state of gleaming perfection. John is
responsible for production planning, personnel and quality
The comfort zone
Mike Garnett, known to everyone as Slim, has worked at Crewe
for 35 years. He is a man absorbed in the craft of working with
leather, and in the many ways in which this and other fabrics
can be made to soften the feel of a vehicle and make it a
luxurious haven for its owner.
His knowledge is wide-ranging and detailed and his skill
extraordinary. “We can do, and have done, everything a customer
wants,” he says. “If you want a car interior designed in the
style of a room in your house, or to match the tie you’re
wearing, we can arrange that. We have used ostrich hide, cavalry
twill, and velvets. It’s the same with colours - there are 17
standard ones, but we have been asked by ladies to match the
nail varnish they are wearing, and by princesses to satisfy
their taste in haute couture fabrics. We have always, so far,
been able to meet their exact requirements.”
How many hides does it take to trim a Bentley? The 9-17 cows
whose hide is needed to trim one will all have been reared
principally for their meat but the hide that is the by-product
is the very finest, and each one will provide around 46sq ft
(4.27sq m) of leather.
Bentley has invested half a million pounds in state-of-the-art
cutting equipment. With the use of a multi tool cutting head
this equipment enables us to achieve cutting accuracy of 0.1mm
on all of the 400 or so hide panels it takes to make up an
interior of a Bentley. Many tasks, such as lining up
stitch-lines in top rolls or the fluting in seats, or trimming
into tight corners, require consummate skill.
Fabricated items such as seats have to be electronically tested
before they are transferred into the car. The final audit under
bright inspection lights is comprehensive and will reveal any
area that requires reworking. It takes an average of six days to
produce the finished leather trim for each Bentley.
May - 2013
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