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13.0 Troubleshooting the 1285 Jointer
13.1 Operating Problems
Trouble Probable Cause Remedy
Finished stock is
concave on back end.
Knife is higher than outfeed table. Raise outfeed table until it aligns with tip
of knife. (see section 9.2)
Finished stock is
concave on front end.
Outfeed table is higher than knife. Lower outfeed table until it aligns with tip
of knife. (see section 9.2)
Finished stock is
concave in the middle.
Both tables have too much end fall. Raise both table ends using the
adjustment screws below the tables (see
Figure 35 below).
Figure 35
Ends of finished stock
are cut more than the
middle.
Table ends are raised higher than the
middle.
Lower both table ends using the
adjustment screws under the tables (see
Figure 35).
Chip out. Cutting against the grain. Cut with the grain whenever possible.
Dull knives/inserts. Sharpen or replace knives/inserts.
Feeding workpiece too fast. Use slower rate of feed.
Cutting too deeply. Make shallower cuts.
Knots, imperfections in wood. Inspect wood closely for imperfections;
use different stock if necessary.
Fuzzy grain. Wood has high moisture content. Allow wood to dry or use different stock.
Dull knives/inserts. Sharpen or replace knives/inserts.
Cutterhead slows
while operating.
Feeding workpiece too quickly, or
applying too much pressure to
workpiece.
Feed more slowly, or apply less pressure
to workpiece.
“Chatter” marks on
workpiece.
Knife/inserts incorrectly set. Set knives properly using provided knife
setting gauge (straight cutterhead only –
see section 9.4). Check that insert slots
are clean and free of dust or debris
(helical cutterhead only).
Feeding workpiece too fast. Feed workpiece slowly and consistently.
Uneven knife marks on
workpiece.
Knives/inserts are knicked, or out of
alignment.
Replace knicked knives/inserts; align
knives properly with knife-setting gauge
(straight cutterhead only).