Troubleshooting - Jet JJ-6CSDX Operating Instructions And Parts Manual

13.0 Troubleshooting

13.1 Operating problems
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 or knife inserts.
Feeding workpiece too fast.
Cutting too deeply.
Knots, imperfections in wood.
Wood has high moisture content.
Dull knives or knife inserts.
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
Raise outfeed table until it aligns with
tip of knife. See sect. 8.6 Outfeed Table
Adjustment.
Lower outfeed table until it aligns with
tip of knife. See sect. 8.6 Outfeed Table
Adjustment.
Cut with the grain whenever possible.
Sharpen or replace knives.
Rotate or replace knife inserts.
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.
Rotate or replace knife inserts.
Feed more slowly, or apply less
pressure to workpiece.
Set knives properly as described in
sect. 8.7 Setting Cutterhead Knives.
Check that knife slots are clean and
free of dust or debris.
Feed workpiece slowly and
consistently.
Align knives per sect. 8.7, Setting
Cutterhead Knives. Replace nicked
knives or correct for small nicks – see
sect. 8.9, Setting Knives for Rabbeting
and Nicks..
Table 2
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