-33-
Aluminium tools may only be
deresinified with solvents which do
not corrode the aluminium.
Promptly replace damaged clamping screws and
cutting elements.
The design of progressive tools must not be modified
during maintenance.
6.3
Tools of older machine types
Please request the installation instructions adjustable
groove cutter, Art.-No. 170650, if you intend to use
the adjustable groove cutter of the NFU 32 (Art.-No.
091418) in the NFU 50.
7
Troubleshooting
Danger
Determining the causes for existing defects and eliminating these always requires
increased attention and caution. Pull the mains plug beforehand!
Some of the most frequent defects and their causes are listed in the following chart. In case of other defects,
please contact your dealer or the MAFELL customer service directly.
Defect
Cause
Elimination
Machine cannot be switched on
No mains voltage
Check power supply
Mains fuse defective
Replace fuse
Carbon brushes worn
Take the machine to a MAFELL
customer service shop
Machine stops while milling
Mains failure
Check mains back-up fuses
Machine overloaded
Reduce feed speed
Turn or replace carbide indexable
cutting inserts
Burn marks on the milled surfaces Tool unsuitable or too blunt for the
work process
Replace tool
Turn or replace carbide indexable
cutting inserts
Chip ejection blocked
Wood is too damp
Dry the wood
Milling without extraction
Connect machine to an external
extraction system
Large wood chip in ejector or
extraction hose
Clean machine or hose
Pull the mains plug during this work
Too many chips accumulating
Reduce feed speed
Increased vibration and poor
milling pattern
Cutter head comes loose
Take the machine to a MAFELL
customer service shop
Milling
tool
cannot
be
released/tightened.
Friction clutch activates
Lock milling tool with pin and
loosen/tighten the screw
Formation of odour
Brake lining heated
Odour formation decreases over
the operating time