A Brief History
 Scotty's
Choppers was founded in 1995 as a general engineering and manufacturing
business. Initial work on bikes was doing repairs and special modifications
to existing bikes.
Over the next 4 years, development of superior motorcycle components
created allowed Scotty's Choppers to move into new markets. In 1999
the business focus turned to work on developing motorcycles products
for expanding customer demand. The word was getting around.
In 2000 Scotty's started work on a totally new custom motorcycle,
The Aluminator. This was a brand new concept bike completely constructed
of aluminium. For more details on this and Scotty's
other custom choppers.
Engineering Qualifications
Scott Cox
With 20 years of engineering and fabrication experience Scotty
brings his wealth of knowledge and experience in creating each individually
designed and constructed motorcycles.
- Certificate Fitting and Turning (Mechanical Engineering) (Issued
by NSW Dept Industrial Relations, Sydney Australia)
- Boiler and Pressure Vessels Welding Permit (Issued by NSW Dept
Industrial Relations, Sydney Australia)
Engineering Specifications
Steel Frames
All steel frames manufactured at Scotty's Choppers are consistently
constructed from the same high quality materials.
- Main Frame Tubing (pipe) has an outside diameter of 33.7mm,
is 3.2mm wall thickness and conforms to Australian Standard (AS)
1074.
- Hollow Bar used to machine steering heads and swingarm
pivot points is manufactured by MECAVAL (Product No. 147MVM312),
has an outside diameter of 56mm and an inside diameter of 40mm.
- Plating used in the construction of drive-train mounting
points is 6 to 12mm think depending upon the application and conforms
to AS1594/HU250-HA250 or AS/NZS3678-250.
- 3/4" Diameter Bright Shaft used for axle and swingarm
pivot points conforms to AS1443.
(Note: The standards were sourced
through Metalcorp Pty Ltd, Australia)
Fuel Tanks
Fuel Tanks constructed at Scotty's Choppers are made
from 5005 series aluminium sheet 2mm and 3mm think. This material
is supplied and manufactured by Capral Aluminium, Australia and
conforms to AS1734.
Stress Testing of Frames
Scotty's Choppers has designed and developed a frame testing jig
following Australian standards and specifications (sourced from
NSW Roads and Traffic Authority). This jig has been constructed
to load completed frames with a mass to determine the structural
strength of these frames. The frame in question is bolted into the
jig by the bottom two frame rails. A solid 1 1/2" diameter
shaft is placed through the steering head and suspended to mimic
the position that the front axle would take. A load of 500kg is
placed on this shaft at axle height using a hydraulic ram and pressure
gauge. The frame must be able to support this force without bending
to deformation. A load of 2,000kg is then placed on top of the frame
in the centre position using the same hydraulic method. Again, the
frame must be able to support this force without bending to deformation.
This test procedure loads the frame to four times the maximum working
load, so is deemed to be satisfactory stress test.
Die-penetrant testing of frames
After a frame has been stress tested it undergoes a die penetrant
test of all the main structural welds, including the steering head,
suspension joints, engine and drive-train mounts, to determine weld
integrity, ie fine cracking or lack of fusion.
This process is carried out using a four part spray system called
Dy-Mark which is manufactured to MIL-1-251351D Type 11, Method B.
After testing is completed frames are issued with an identification
number and the testing date.
Fuel Tank Pressure Testing
Aluminium Fuel Tank testing is carried out at Scotty's Choppers
using hydrostatic method. After manufacturing is completed, all
external orifices of the tank are blocked, excepts the fuel tap
hole. The tank if filled with water and capped off with an air fitting.
The tank is then pressurised to 10 P.S.I and left standing fro 20
minutes to test for any leakage. During general service fuel tanks
are not subject to pressurisation, therefor this method far exceeds
normal performance standards. After testing is complete, tanks are
marked with an identification Number and the test dates.
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