Troubleshooting The Jjp-8Bt; Performance Troubleshooting - Jointer - Jet JJP-8BT Operating Instructions And Parts Manual

16.0 Troubleshooting the JJP-8BT

16.1 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.
Cutting too deeply.
Knives are nicked, or out of alignment.
Remedy
Align cutterhead knives with outfeed
table. See sect. 11.1, Cutterhead Knife
Adjustment.
Align cutterhead knives with outfeed
table. See sect. 11.1, Cutterhead Knife
Adjustment.
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.
Feed more slowly, or apply less
pressure to workpiece.
Set knives properly as described in
sect. 11.1, Cutterhead Knife
Adjustment. Check that knife slots are
clean and free of dust or debris.
Feed workpiece slowly and consistently.
Make shallower cuts.
Align knives per sect. 11.1, Cutterhead
Knife Adjustment. Replace nicked
knives.
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