Quartering is the term for setting crankpins of locomotive drivers at 90 degrees ‘crank’ apart (similar to an automobile crankshaft). Accurate quarter of all drivers in a set to the same angle (whether exactly 90 degrees or not) is critical for smooth operation of model locomotives.

This tool enables quick, accurate quartering of HO, S, and On3 drivers up to 1" O.D. on 1/8" or 3mm axles.  The wheel is located onto the axle while the wheelset is securely held in the tool avoiding possibility of slippage. Can also be used to compare quarter of existing driver sets.

A .100" clearance is required on each side of the gear. Will not fit drivers with gears wider than 1/8" (most drivers have narrower gears). Will not fit most Rivarossi drivers due to inconsistent axle diameters.  Operating suggestions included.

Designed by Larry Richards for your modeling pleasure.