Jet JPM-13CS, Operating Instructions And Parts Manual

20

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.