Troubleshooting; Performance Troubleshooting - Jointer - Jet JJP-12 Operating Instructions And Parts Manual

Troubleshooting

Performance Troubleshooting – Jointer
Trouble
Finished stock is
concave on back
end.
Finished stock is
concave on front end.
Chip out.
Fuzzy grain.
Cutterhead slows
while operating.
"Chatter" marks on
workpiece.
Uneven knife marks
on workpiece.
Probable Cause
Knife is higher than outfeed table.
Outfeed table is higher than knife.
Cutting against the grain.
Dull knives.
Feeding workpiece too fast.
Cutting too deeply.
Knots, imperfections in wood.
Wood has high moisture content.
Dull knives.
Feeding workpiece too quickly, or
applying too much pressure to
workpiece.
Knives incorrectly set.
Feeding workpiece too fast.
Knives are nicked, or out of
alignment.
Remedy
Align cutterhead knives with outfeed
table. See Setting Cutterhead Knives.
Align cutterhead knives with outfeed
table. See Setting Cutterhead Knives.
Cut with the grain whenever possible.
Sharpen or replace knives.
Use slower rate of feed.
Make shallower cuts.
Inspect wood closely for
imperfections; use different stock if
necessary.
Allow wood to dry or use different
stock.
Sharpen or replace knives/inserts.
Feed more slowly, or apply less
pressure to workpiece.
Set knives properly as described in
the Setting Cutterhead Knives
section. Check that knife slots are
clean and free of dust or debris.
Feed workpiece slowly and
consistently.
Align knives per the Setting
Cutterhead Knives section. Replace
nicked knives.
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