Quartering
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Quartering is the setting of the wheels of a two or four cylinder locomotive to ensure that the crankpins on one side are at 90° to those on the other, in order to ensure self-starting.
![](/mediawiki/images/thumb/b/bd/BoringCrankpinHolesInQuarteringMachine.png/500px-BoringCrankpinHolesInQuarteringMachine.png)
Boring Crankpin Holes in the Quartering Machine. From "Locomotive Building"
Methods
Dave Sclavi's quartering jig.
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