Alt's fairly • simple to check jointer tables for warping and parallelism. You'll need two accurate straightedges, one about 1 ft. long and anotherabout 4 ft. long, and two sets of feeler gauges (available at auto-supply stores).
With the jointer unplugged, adjust the gib screws on the infeed and out-feed tables so the tables can be raised and lowered smoothly but with no plav. You may need to partially disassemble, clean and relubricate the tables to do this well. Next, adjust the infeed table so it's just slightly lower than the out feed table and lock both tables. Move the fence and guard out of the way.
First check for out-of-parallel across the width of the tables. Place the short straightedge on one side of the outfeed table, and extend it slightly over the infeed table. (See drawing.) Measure the clearance between the straightedge and the infeed table with feeler gauges as shown. Move the straightedge to the other side of the table and measure again. The difference in the measurements indicates how much the tables are out-of-par-allel across their width. New machines should be within .001 in. Most woodworkers will get satisfactory results from a machine that is .002 in. out of parallel.
Next, check along the length of the tables. Hold the short straightedge in the same position as mentioned above and raise the infeed table to just touch it. Remove the short straightedge and place the long straightedge along the
Center should "rise* no more than 010 In.
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