so does the engine survival.
You should know that graphits are defined using a sum
of parameters, such as:
The supply voltage, the intensities to convey, the
speed, the nature of the track (segments commutator or
rings), constraints of use of the machine ... Any
error in the choice of qualities can lead the
superabundant sparks production, an overheating or
premature wear of the runway friction surface.
brushes are generally 2 to 3 tenths less than the size
of the metal cage in which they slide.
Just give us the size of the cage, and we will propose
the appropriate brushes.
For the length, it is a little different, and it will
be based on several parameters we will direct you.
graphite can be machined very easily with medium grit
The aim is to have 2-3 tenths of clearance between the
brush and his the cage.
Just put a sandpaper strip completly flat, and to rub
the brush on, taking care to press evenly to keep the
After that, clean the brush to remove any abrasive
grains, and test the brush in his cage so that it
the implementation of the brushes you should check:
- That the new brushes sliding freely in their cages
(2 to 3 tenths of freedom).
- That the pressure spring fulfills its role, and the
brushes are in contact with their tracks.
- That the electrical connection has been properly
- If necessary, make a seating on the friction face of
the brushes. (See next question) After reassembling
the brushes, run the machine at no load and check that
there is no malfunction sign (temperature rise, burnt
smell, abnormal motor rotation, abnormal sounds ...).
Seating is to give the friction face of the brushes
the same shape as its track.
This is done with a strip of sandpaper having the same
width as the brush. With the abrasive side towards the
brush one should slip the strip between the commutator
and the brush and pull it back and forth until the
brush's commutator end closely conforms in shape to
the commutator, this is done under normal brush holder
pressure(more brush is big, more important is the
Clean the machined face to dispel any trace of
changing the brushes, always change all motor brushes
(and never mix different origin grades). The quality
of the graphite may be slightly different, it could
cause engine damage.
experience of 85 last years in electrical graphites
allowed us to dispose of carbon equivalent to those of
the world's leading manufacturers..