Brass Sound Cams for model railroads by Sierra Scale Models

Many of the older sound systems (PFM, Magoffin, etc.) used on model railroads rely on make-break contacts to establish the steam exhaust sound. Original applications required painting the back of a driver with alternating painted and unpainted areas that wear off. The wiper could also cause groves in the back of the driver from continued rubbing in the same spot. Our easy to install, 4 or 6 solid point brass cams, provide an alternate way to have the drivers timed with the steam exhaust. The solid cam (hexagon) has six contact points on it to conform to the rapid three-cylinder operation of Willamette and Shay locomotives. The two-part solid brass cams are placed around a locomotive driver axle to form a full 4-cornered cam. This type of cam is used on all other locomotives. Be sure to measure your axel before ordering -- both types are available for 1/8 " or 3mm axels.
	Brass Sound Cam for Shay or Willamette Locomotives - $9.95. Send an e-mail to specify axel size (1/8" or 3 mm). Custom sizes are available.
	Brass Sound Cam for Rod Type Steam Locomotives - $9.95. Send an e-mail to specify axel size (1/8" or 3 mm). Custom sizes are also available.
Soldering these cams to the axle is recommended. Full instructions are included with each brass cam. If our standard sizes do not meet your needs, we will custom machine a cam for your axle size.