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14.0 Troubleshooting the JJP-12,JJP-12HH
14.1 Performance troubleshooting – Jointer
Trouble Probable Cause Remedy
Finished stock is
concave on back
end.
Knife is higher than outfeed table.
Align cutterhead knives with outfeed
table. See sect. 10.3, Setting
cutterhead knives.
Finished stock is
concave on front end. Outfeed table is higher than knife.
Align cutterhead knives with outfeed
table. See sect. 10.3, Setting
cutterhead knives.
Chip out. Cutting against the grain. Cut with the grain whenever possible.
Dull knives.
Sharpen or replace knives/Rotate
knife inserts or replace 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. 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.
Knives incorrectly set.
Set knives properly as described in
sect. 10.3, Setting cutterhead knives.
Check that knife slots are clean and
free of dust or debris.
Feeding workpiece too fast.
Feed workpiece slowly and
consistently.
Uneven knife marks
on workpiece.
Knives are nicked, or out of
alignment.
Align knives per sect. 10.3, Setting
cutterhead knives. Replace nicked
knives/Rotate knife inserts.
Table 2
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