This tool has three
important Pinewood Derby car wheel preparation uses:
This Tool has a square end to improve wheel
hub accuracy
and a coned end to reduce hub friction. Check local
rules before coning wheel hubs. This tool also reams undersize wheel
bores.
Molded Pinewood Derby car wheel hubs can vary in size by as much
as .01".
This tool will allow you to ream the wheel hubs all to the same
size or help in selecting 4 wheels with similar hubs. This is one
of the most important steps in alignment because the
car will sit square on the track when all wheels have the same
radius.
Test fit each wheel by sliding it onto the tool pin. If the wheel
won't slide on , the wheel bore is too small. Use
steady hand pressure and a twisting motion to work the wheel on
to the tool. Remove the wheel and repeat 3 times.
This tool can also be used for coning the wheel hubs. All Pinewood
Derby cars will benefit from coning the in-board hub for a reduction
in body to hub friction. This tool makes an even, polished cone
that reduces body contact by 95% and can even be used to polish
in graphite by adding a small amoujnt in the dished end after coning
for even more friction reduction.
Dip the coarse grit sandpaper (included) in a cup of water. Remove
the protective cap from the square end of the tool,
pierce the sandpaper (grit facing outwards) and slide
the sandpaper until it contacts the body of the tool. To minimize
the risk of a hand injury, leave the protective cap on the coned
end of the tool.
Place a wheel onto the square end of the tool, hub side first.
With one hand hold the tool and the sandpaper. With the other hand,
press the wheel against the sandpaper. Rotate the wheel back and
forth for about 10 seconds.
Repeat for the other wheels. Use a new area of the sandpaper for
each wheel. If the hubs will not be coned, repeat with the fine-grit
sandpaper.
To cone the wheel hubs, perform the above steps using the coned
end of the tool and the coarse-grit sandpaper then repeat with
the fine-grit sandpaper.
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