Hansa C16 O&M Manual - OM-009 Revision G 26/09/2019
© Hansa Chippers 2019
14
Sharpen the knives on a surface grinder. A cutting angle of 36 ° is critical for the
performance of the chipper. Make sure plenty of coolant is used when grinding to
avoid softening of the steel knives.
Reinstall the knives
Clean all mounting surfaces and remount
the knives in the reverse procedure.
Note
: Be sure to replace the knives the
correct way around (as shown in the
diagram). Only tighten the clamping bolts
enough to hold the knives in place during
adjustment. Do not tighten them fully until
step 7.
Adjust the knives initially using the
adjustment bolts to protrude the edge of
the knife just past the edge of the knife
holding block.
After sharpening, the width of the knives
will have been reduced, therefore the gap
between the knives and anvil may require
adjustment. This gap is tapered out slightly
to allow for a small amount of movement in
the cutting rotor as it bites into the wood.
If there is not enough clearance, the knife
edge may touch the anvil through
deflection when cutting heavy branches
and damage the sharp edge. Too much
clearance will allow small twigs and fibrous
materials to be dragged through without
being cut.
Adjust the knife in or out using the two
adjustment bolts to achieve the correct
clearance between the knife and anvil. The
clearance between the knife and anvil
should be approximately 1 mm on the
inside closest to the bearing and 3 mm on
the outside closest to the edge of the
cutting rotor (refer to diagram for more
detail).
4
5
6
36 °
Knife
Adjustment bolts
Locking nuts
Rotor disc
Knife holding block
Clamping bolts
Clamping plate
Knife holding
block
Knife
Side view: Cutting rotor
7
