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15.2 Performance problems
Trouble Probable Cause Remedy
Snipe.
Table rollers not set properly. Adjust rollers to proper height.
Inadequate support of long boards.
Support long boards with extension
rollers.
Uneven feed roller pressure front to
back.
Adjust feed roller pressure.
Dull knives. Sharpen or replace knives.
Lumber not butted properly.
Butt end-to-end each piece of stock as
they pass through.
Fuzzy grain. Planing wood with high moisture
content.
Remove moisture by drying, or use
different stock.
Dull knives. Sharpen or replace knives.
Torn grain. Too heavy a cut. Adjust proper depth of cut.
Knives cutting against grain. Cut along the grain where possible.
Dull knives. Sharpen or replace knives.
Rough/raised grain. Dull knives. Sharpen or replace knives.
Too heavy a cut. Adjust proper depth of cut.
Planing wood with high moisture
content.
Remove moisture by drying, or use
different stock.
Rounded, glossy
surface.
Dull knives. Sharpen or replace knives.
Feed rate too slow. Increase feed rate.
Cutting depth too shallow. Increase cutting depth.
Poor feeding of
lumber. Inadequate feed roller pressure.
Adjust feed roller tension. If proper
tension cannot be achieved, replace
feed rollers.
Planer table rough or dirty.
Clean pitch and residue from table, and
apply paste wax.
Belt slipping on pulleys. Tighten belt.
Surface of feed rollers too smooth.
Lightly roughen feed roller surface with
sandpaper.
Wavering molding
pattern.
Improper guide setup. Review proper guide setup for molding.
Tearing out at end of
molding.
Improper guide setup. Review proper guide setup for molding.
Inadequate outfeed pressure. Adjust feed roller tension.
Uneven depth of cut
side to side.
Knife projection not uniform Adjust knife projection.
Table not parallel to cutterhead. Adjust table/cutterhead parallelism.
Board thickness does
not match depth of cut
scale.
Depth of cut scale is incorrect. Adjust depth of cut scale.