model t24631
8" spiral cutterhead
installation instructions
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introduction
The Model T24631 spiral cutterhead is designed
to replace the straight-knife cutterhead on the
Model G0656/G0656P 8" Jointer.
inventory (figure 2)
a. spiral Cutterhead w/inserts........................ 1
b. Torx drivers T20 ........................................ 2
c. Torx L-Wrenches T20 ................................ 2
d. Flat head Torx screws T20 M6-1 x 15...... 3
e. indexable Carbide inserts 14 x 14 x 2 ....... 5
B
a
C
d
e
figure 1. T24631 spiral Cutterhead.
it takes approximately one hour to install this
cutterhead and re-adjust the jointer. The job con-
sists of (1) removing the old cutterhead, (2) install-
ing/shimming the new spiral cutterhead, and (3)
re-adjusting the outfeed table to be even with the
carbide inserts at TdC (top dead center).
figure 2. spiral cutterhead inventory.
items needed for installation
Wrench 14mm ................................................... 1
Wrench 17mm.................................................... 1
socket driver 1/4".............................................. 1
Precision straightedge ..................................... 1
Feeler Gauge set (sizes not important) ............ 1
Pulley Puller....................................................... 1
Pair of heavy Leather Gloves ........................... 1
rubber dead Blow hammer ............................. 1
2x4 Wood Block 4" Long................................... 1
note: We strongly recommend replacing the
old cutterhead bearings during installation.
specifications
Length...............................................................8"
diameter...........................................................3"
number of spirals.............................................. 4
number of inserts............................................ 40
insert size ....................................14 x 14 x 2mm
insert screw Thread size......................... M6-1.0
shaft diameter (Long side)....................... 20mm
shaft diameter (short side) .......................17mm
Weight .......................................................18 lbs.
recommended, but not required
inch/Pound Torque Wrench............................... 1
arbor Press ....................................................... 1
Ball Bearing 6204zz.......................................... 1
Ball Bearing 6203zz ......................................... 1
CoPyriGhT © JULy, 2012 By GrizzLy indUsTriaL, inC.
Warning: no portion of this manual may be reproduced in any shape
or form Without the Written approval of grizzly industrial, inc.
#Tr15167 PrinTed in China
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9. remove the bearings and bearing blocks
from the cutterhead. There are numerous
ways to do this, but avoid prying on them—
they must be pulled off evenly and with care.
if you are unsure about how to proceed, seek
help from a mechanic/machinist, or numer-
ous resources can be found on the internet.
15. Using the straightedge and feeler gauge set,
inspect the cutterhead parallelism with the
outfeed table as shown in figure 7. With the
straightedge in position, raise or lower the
outfeed table until the cutterhead body (not
the carbide insert) just touches the straight-
edge.
note: It is difficult to remove the bearings
without damaging them. This is why we
strongly recommend installing new bearings
on the cutterhead—instead of trying to reuse
the original ones and then repeating this pro-
cedure again in the near future.
Straightedge
Outfeed Table
10. install bearings in the bearing blocks, then
install the bearing blocks on the cutterhead.
To avoid damaging the new bearings or the
cutterhead shaft, use a arbor press or have a
mechanic/machinist install these for you.
if neither of the above are acceptable options,
install the bearings by gently tapping them
with a block of wood and a rubber dead blow
hammer. if you do this, take your time and
make sure they install as evenly as possible.
figure 7. Checking cutterhead parallelism.
16. Move the straightedge to the other side to
determine if one end of the cutterhead body
is higher/lower than the other. (Place the
feeler gauge between the cutterhead body
and the straightedge to determine the height
difference.)
11. re-install the key onto the keyway, then press
the pulley onto the new cutterhead shaft.
12. re-install the bearing block studs onto the
—if the cutterhead is even or within 0.004"
with the outfeed table from one side to the
other, skip to step 19.
bearing blocks.
13. install the cutterhead (figure 6) with the lock
washers and hex nuts previously removed.
—if the cutterhead is over 0.004" from one
side to the other, go to step 17.
17. Loosen the hex nuts securing both bearing
block studs, lift the spiral cutterhead slightly,
then place a shim beneath the bearing block
that needs to be adjusted.
note: Use the shims from your old cutterhead
if available. If not available, newspaper is
approximately 0.003" thick and will work for
shimming (we don't recommend shimming
more than 0.004" on either side, as this may
affect how the bearing block seats in the cast-
ing).
figure 6. example of spiral cutterhead installed.
18. repeat steps 15–17 and adjust if necessary,
then tighten the hex nuts on the bearing block
studs.
14. Tighten the spiral cutterhead in place, and
ensure both pulley setscrews are tight.
-3-
T24631 6" spiral Cutterhead
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19. Place a straightedge on the outfeed table
so it extends over the cutterhead, and rotate
the cutterhead pulley until one of the carbide
inserts is at top-dead-center (TdC), as shown
in figures 8 & 9.
rotating inserts
The cutterhead is equipped with 40 indexable car-
bide inserts. each insert can be rotated to reveal
any one of its four cutting edges. Therefore, if one
cutting edge becomes dull or damaged, simply
rotate it clockwise 90˚ to reveal a fresh cutting
edge (figure 10).
Top Dead
Center
reference dot
figure 8. Cutterhead insert at top-dead-center.
figure 10. rotating indexable carbide inserts.
Straightedge
in addition, each insert has a reference dot on
one corner. as the insert is rotated, the reference
dot location can be used as an indicator of which
edges are used and which are new. The insert
must be replaced when all four edges are dull.
Outfeed
Infeed
installing or adjusting a carbide cutter:
1. disConneCT JoinTer FroM PoWer!
figure 9. setting outfeed table height.
When correctly set, the carbide insert will just
touch the straightedge when the insert is at
its highest point of rotation (figure 9).
2. remove any sawdust from the head of the
carbide insert Torx screw.
—if your outfeed table is correctly set, no
adjustments are necessary.
3. remove the Torx screw and carbide insert.
4. Clean all dust and dirt off the insert and the
cutterhead pocket from which the insert was
removed, and replace the insert so a fresh,
sharp edge is facing outward.
—if the insert lifts the straightedge off the
table or the table is below the straight-
edge, adjust the outfeed table height with
the handwheel until the straightedge just
touches an insert at its highest point of
rotation.
note: Proper cleaning is critical to achieving
a smooth finish. Dirt or dust trapped between
the insert and cutterhead will slightly raise the
insert, and make noticeable marks on your
workpieces the next time you cut.
20. Lock the outfeed table, then re-install the
fence.
21. install the cutterhead guard back over the
cutterhead, making sure that the spring ten-
sion in the guard is properly set so the guard
springs back over the cutterhead when it is
pulled back and released.
5. Lubricate the Torx screw threads with a
light machine oil, wipe the excess oil off the
threads, and torque the Torx screw to 48-50
inCh pounds.
note: Excess oil may squeeze between the
insert and cutterhead or in the screw hole,
thereby lifting the insert or screw slightly and
affecting workpiece finishes.
22. re-adjust the infeed table.
-4-
T24631 6" spiral Cutterhead
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g9644—12" precision straightedge
h2675—16" precision straightedge
if you don't have a good straightedge for preci-
sion setup work, order one from us. These grade
00 heavy-duty stainless steel straightedges are
manufactured to din874 standards for profes-
sional results in setup and inspection work.
accessories
t21348—10 pack of indexable carbide inserts
replacement carbide inserts for T24631
cutterhead.
figure 14. Precision straightedges.
g9615—15-pc feeler gauge set
figure 11. T21348 indexable Carbide inserts.
This 31⁄2" long Feeler Gauge set provides a quick
and accurate method of determining gap widths.
includes: .002", .003", .004", .005", .006", .008",
.011", .012", .013", .014", .016", .018", .020", .022"
and .025" blade thickness.
g8995—4" heavy duty pulley puller
indispensable for pulling gears or pulleys off of
press-fit shafts. Can be used in either a 2 or 3 jaw
configuration. The 4" jaw fingers are also revers-
ible so they can grab an outside or inside diam-
eter. The forcing screw has a live center and is
made of tough hardened steel. Keep one of these
handy in your tool box.
figure 15. example feeler gauge set.
p6204zz—ball bearing 6204zz
p6203zz—ball bearing 6203zz
replacement bearings available from Grizzly
Parts department.
figure 12. G8995 4" heavy duty Pulley Puller.
h7830—2 ton arbor press
figure 13. h7830 arbor Press.
figure 16. Ball bearing.
-5-
T24631 6" spiral Cutterhead
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t24631 parts breakdown and list
4
1
2
3
REF PART #
DESCRIPTION
1
2
3
4
P0452Z001
P0452Z002
PFH35M
DRIVER BIT TORX T20
INDEXABLE INSERT 14 x 14 x 2
FLAT HD TORX SCR T20 M6-1 X 15
L-WRENCH TORX T20
P0452Z009
-6-
T24631 6" spiral Cutterhead
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