Oliver 4420 Owner's Manual page 37

If the machine stalls or the workpiece gets stuck:

Table height is set too high.

Stop the machine and wait for the machine to come to a complete stop.

Lower the table to remove the workpiece.

Decrease the depth of cut, and restart from step 3.
5. If the workpiece is feeding properly, wait until the entire workpiece clears the outfeed roller, then
remove the work piece.
6. After the initial pass, measure the thickness at the midsection of the workpiece.
If more material needs to be removed, continue with the following steps.
7. If you need to remove a lot of material, run a few passes with deeper cuts, then finish with a light pass
with shallow cuts and slow feed rate.
8. If your DRO is already calibrated, simply switch to absolute mode. Gradually plane down the wood
until the desired thickness is achieved. Each pass should remove no more than 1/8" for workpiece
wider than 6-1/4", and no more than 15/64" for workpieces 6-1/4" wide or less. Reduce maximum
depth of cut for harder wood types.
9. Alternatively, you may toggle to INC mode and progressively plane the workpiece to desired thickness.
Upon completion of each pass, reset the reading of DRO. Use a caliper to measure workpiece's mid-
section thickness, and decide the depth of cut for the next pass. Repeat the process until the desired
thickness is achieved.
Turn machine off when operation completes.
4420 Planer OLIVERMACHINERY.NET 37 | Page