Use and Care Manual

20
16.0 Troubleshooting the JJP-8BT
16.1 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. 11.1, Cutterhead Knife
Adjustment.
Finished stock is
concave on front end. Outfeed table is higher than knife.
Align cutterhead knives with outfeed
table. See sect. 11.1, Cutterhead Knife
Adjustment.
Chip out. Cutting against the grain. Cut with the grain whenever possible.
Dull knives. Sharpen or replace knives.
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.
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. 11.1, Cutterhead Knife
Adjustment. Check that knife slots are
clean and free of dust or debris.
Feeding workpiece too fast. Feed workpiece slowly and consistently.
Cutting too deeply. Make shallower cuts.
Uneven knife marks on
workpiece.
Knives are nicked, or out of alignment.
Align knives per sect. 11.1, Cutterhead
Knife Adjustment. Replace nicked
knives.