Operation; Step 1: Preparation - Oliver 4420 Owner's Manual

Operation

For safety and best results, please take the following steps for operating this machine.

Step 1: Preparation

Only Use Natural, Good Quality Wood
Only plane natural wood materials that is in good quality. Cracked stock, board with loose knots, plywood
and other engineered wood products can break apart and cause severe kickbacks, which can lead to
severe injuries and machine damages.
Do not plane treated lumber or anything that contains harmful chemicals, as this will spread wood dusts
that contain such harmful chemicals. NEVER plane boards that are shorter than 6" as mentioned in the
specifications.
Inspect the Workpiece
Carefully inspect the workpiece for foreign objects. Nails, staples, rock chips and other objects embedded
on the wood surface will damage the planer. To avoid chipping/dulling the cutter inserts, it is advised to
clean a workpiece with a stiff brush to remove all dirt and foreign objects before planing, especially for
rough sawn or reclaimed lumber. Use metal detector to scan for metal as needed.
Check Moisture Content
Check moisture content of the workpiece before operation. "Green wood" with moisture content over
20% will not cut properly and may jam the machine. Excessive moisture content will also cause planer's
unpainted surface to rust. Besides, as the workpieces dries, the planed surface will become fuzzy, and the
workpiece may wrap. It is recommended to allow the workpiece to dry and stabilize before it is processed.
Wrapped Stock
Workpiece should have a flat bottom to be processed by a planer. It is acceptable to process a slightly
cupped board with the cupped side facing down and begin with light cuts. Boards with moderate cupping,
bowing or twisting should have one side face-jointed before being processed by a planer.
Avoid using boards with severe wrapping, as they can be unstable and might cause severe kickbacks during
operation.
Glue-Ups
Glue left on the workpiece surface can dull the cutters and reduce cut quality. Scrape off all glue from the
workpiece before operation.
Wood Grain Direction
This planer is designed to plane WITH the grain direction of the wood. Do not plane cross-grain or end-
grain. Severe kickback and chipping may occur.
34 | Page Oliver Machinery 4420 Planer