Foredom Brush Pair For Tx, Lx And Powergraver Motors

Description

This pair of replacement carbon brushes from Foredom are suitable for use with Foredom LX, TX and Power Graver Pendant Motors.

Brushes need to be checked for wear periodically. In their new state, the brushes measure approximately 14mm in length (excluding spring) and should be replaced when they reach 6mm.

It is advised to replace both brushes at the same time, even if one is less worn than the other.

More about motor brushes:

All Foredom electric motors are the 2-pole type, and use one set of brushes, one on each side of the motor case, opposite the shaft end.

The brushes are installed in brush holders, which are copper or brass tubes encased in plastic, with shallow plastic screw caps to retain, and provide access to, the brushes.

The leads from the motor power cord are connected to the metal brush tubes, from which current flows into the brushes.

A brush consists principally of a length of compressed graphite, with carefully controlled characteristics to provide the lowest possible resistance, low friction, and long life.

A flexible copper pigtail is imbedded in the brush, terminated in a U or disc terminal. The pigtail is surrounded by a coil spring.

The free end of the brush is curved, to match the curvature of the commutator.

When the brush is inserted in the brush holder and the screw cap (999 FM24) is in place, the spring maintains proper brush pressure on the commutator as the brush wears, and the pigtail terminal contacts the inner metal tube to provide a current path to the brush.

Foredom part number: MP319P.