7
7.4 Changing cutter knives
Risk of personal injury by cuts from
the cutter knives. Wear suitable
gloves when changing cutter knives.
Knife Removal
Turn the square-head bolts (A, Fig 9)
of the cutter knife lock bar (B) all the
way in (wear gloves!).
Springs (D) will cause the knife to rise
in the slot.
At first remove cutter knife (C), then
cutter knife lock bar from the cutter
block.
Fig 9
Clean all surfaces of cutter block and
cutter knife lock bar with a suitable
solvent (do not use cleaning agents
that could corrode the light metal
components).
Use only suitable cutter knives
conforming the technical specification
and EN 847-1
Unsuitable, incorrectly mounted, dull,
cracked of bent cutter knives can work
loose or increase the risk of kickback
considerably.
Always replace all 4 cutter knives at
once.
The cutter knife lock bars are
balanced to each other and thus can
randomly be placed.
Only cutter knives marked “HSS” or
“HS” can be resharpened!
When resharpening, remove the same
amount of material from all three
cutter knives, otherwise a balancing
error may cause damage to the
bearings.
Cutter knives can only be resharpened
down to a minimum width of 15 mm.
Use genuine Jet replacement parts
only.
TIP:
If a foreign object nicks the knives
cutting edges
Instead of changing the knives, simply
axially offset the knives to each other.
Move one knife up to 5mm to the right
and another knife up to 5mm to the
left of the cutterhead.
Knife Installation and Adjustment
Any knife adjustment or replacement
should be done to all four knives at
the same time.
Failure to do this may result in an out-
of-balance cutterhead and vibrations
which can lead to bearing failure.
Place the cutter knife lockbar in the
cutterblock´s groove. Turn the 8
square-head bolts so far that the
cutter knife will just slide in.
Insert a sharp cutter knife and adjust
position with the cutter knife lockbar,
so that neither protrudes over the
edge of the cutter block.
Place the knive-setting gauge on the
cutterhead (Fig 10)
Fig 10
This will hold the high point of the
knive to the proper height above the
cutterblock.
Springs (D, Fig 9) will cause the knife
to rise in the slot.
Use the gauge at both ends of the
knife.
Knive relationship must be held within
0.03mm for accurate and smooth
planing.
To tighten the cutter knife, turn the 8
square-head bolts of the cutter knife
lockbar.
Start tightening with the two outer
bolts.
At first halve tighten all 32 square-
head bolts, then repeat and fully
tighten all bolts this time.
Do not extend tool when tightening the
bolts, do not tighten bolts by striking
the wrench.
Close and lock the cutter block cover
after knife changing has been
completed (Fig 8).
7.5 The Planer’s Feed System
G…Anti Kickback Fingers
H…Segmented Infeed Roller
I…Segmented Chipbreaker
J….Cutterhead
K….Pressure Bar
L….Outfeed Roller
M….Workpiece
N….Table Rollers
O….Table
Fig 11
