Manufacturing the donkey cart and ambulance
Practical Action
(Vice screw)
J
M8 Bolts (and nuts)
16 25
K
M30 Centre Screw (and 1
160
2 nuts)
L Round flat plate
2
(Locking Disc)
M
Hub Clamp Handles
2
116
M8
M30
16
2.3 Instructions
1. The purpose of the jig is to hold the wheel rim concentric to the wheel hub so
that the wheel spokes can be welded in place. The first task is to the cut the
angle iron to the appropriate sizes shown in the material list (Parts A and B).
2. Once the material is cut a number of 8mm clearance holes need to be drilled
in each piece of angle iron for the 8 wheel clamps (see diagram 3) which will
allow for varied size wheels to be made. It is important that these holes are
drilled accurately. The holes in Part A can be drilled first, with the first hole
being 115mm from the end. After that there should be 6 more holes 50mm
apart. This is also the case for part B where you should start at the end which
has not been cut at 45 degrees when marking the holes.
Diagram 1. Hole positions for the jig base
The table below shows the position of the holes and the different size wheel rims
which can be produced (ID) depending on their position (hence the holes in
diagram 1 are 50mm apart.
Wheel
Rim (ID)
150mm
200mm
250mm
300mm
Hole position from end
(for wheel clamp)
415mm
365mm
315mm
265mm
Hole position from end
(for wheel clamp)
265mm
215mm
165mm
115mm
3