Jet 708457DXJ, Operating Instructions And Parts Manual

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13.0 Troubleshooting
13.1 Operating problems
Trouble Probable Cause Remedy
Finished stock is
concave on back
end.
Knife is higher than outfeed table.
Raise outfeed table until it aligns with
tip of knife. See
sect. 8.6 Outfeed Table
Adjustment .
Finished stock is
concave on front end.
Outfeed table is higher than knife.
Lower outfeed table until it aligns with
tip of knife. See
sect. 8.6 Outfeed Table
Adjustment .
Chip out.
Cutting against the grain. Cut with the grain whenever possible.
Dull knives or knife inserts.
Sharpen or replace knives.
Rotate or replace knife 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 or knife inserts.
Sharpen or replace knives.
Rotate or replace knife 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. 8.7 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. 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