How to Set Up a Planer for Two-Sided Stock Removal
What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
Contents
What Two-Sided Stock Removal Means
Two-sided stock removal means planing a board, flipping it, and taking cuts from both faces until you reach the target thickness. It can save time when removing a lot of material, but it does not automatically make a board flat or square. A thickness planer makes the face against its bed parallel to the face against its cutterhead. If the first face is bowed or twisted, the planer can reproduce that shape on the opposite face.
For a flat, parallel result, flatten one face first with a jointer, a planer sled, or another reliable method. Then use the planer to bring the opposite face parallel. Two-sided cuts are useful for rough sizing, but flipping a warped board between cuts is not a substitute for flattening.
Check the Board and the Machine
Measure the stock at several points with calipers or a reliable thickness gauge. Note the thickest area, the thinnest area, and the finished dimension. Check for twist, cup, bow, loose knots, cracks, and embedded metal. Reject or repair stock with loose defects that could break apart under the cutterhead. A metal detector is useful on reclaimed lumber; never rely on a quick visual check alone.
Read the planer manual for its minimum and maximum stock thickness, maximum width, and recommended cut depth. Confirm the knives or inserts are sharp and properly seated, the tables and rollers are clean, and the dust collection is connected. Wear eye and hearing protection. Do not wear gloves near rotating feed rollers, and keep hands clear of the infeed and outfeed openings.
If you are buying a planer for this work, a benchtop thickness planer is adequate for most boards that fit its capacity. A floor-standing machine is worth considering for frequent wide or heavy stock, but it costs more and needs more space and power. Compare benchtop thickness planers by width capacity, cutter type, dust-port size, and available service parts—not just motor horsepower.
Choose a Cut Strategy
For stock with one known-flat face, keep that face against the planer bed and take light cuts from the other face. Once the board is near the target thickness, flip it and take a shallow finishing cut if needed. This can balance removal and reduce the chance of leaving a large thickness difference across the board, but the board still needs a flat reference face.
For a board with neither face flat, make a stable sled from a rigid, flat panel. Shim the board so it cannot rock, then secure the shims so they cannot shift into the cutterhead. Plane the top face until it is flat, remove the board from the sled, and plane the opposite face. A purpose-built planer sled can help with short or twisted stock, but a shop-made one is fine if it is rigid and secure.
Use modest passes. For many benchtop planers, starting around 1/32 inch per pass on hardwood is a cautious approach; softwood may tolerate more, but follow the machine’s manual. Take less when the board is wide, hard, figured, or nearly at final thickness. Deep cuts increase strain, tear-out, snipe, and the risk of a stalled feed.
Set Up and Run the Planer
Set the depth stop or cutterhead height so the first pass removes only a small amount from the high spots. Feed the board with the grain when practical; reversing grain direction can reduce tear-out. Support long boards level at both ends, keeping the supports slightly below the planer bed so they do not lift the stock. Let the feed rollers pull the board—do not push or pull against them.
After each pass, check the surface and measure thickness at both ends and in the middle. If the board rocks on a flat reference surface, stop and fix the setup rather than taking more cuts. For two-sided removal from a flat board, alternate faces after each light pass or pair of passes, and keep track of the amount removed from each side. Do not flip a board onto a face that is still rough or unstable and expect the cut to correct it.
Many portable planers leave snipe—deeper cuts near the leading or trailing end—because the board lifts slightly as it engages or exits the rollers. Support the stock, keep steady pressure on the infeed and outfeed ends without forcing it, and allow extra length for trimming. If snipe is persistent, check the manual’s instructions for roller or table adjustment. Avoid reaching into the machine to correct a board while it is running.
Compare Setup Options
| Setup | Best for | Main trade-off |
|---|---|---|
| Jointer, then planer | Regular stock preparation and reliably flat faces | Requires a jointer and enough board length for safe feeding |
| Rigid planer sled with shims | Occasional twisted or bowed boards | Slower setup; sled and stock must be stable |
| Planer alone, alternating faces | Already-flat boards needing thickness reduction | Will not remove twist or correct a bowed reference face |
A jointer is faster when flattening boards is routine; a sled is often cheaper for occasional work. If you are deciding whether to add a machine, compare woodworking jointers by cutting width, bed length, and dust collection. A small jointer may not handle the wide stock you actually use, so check capacity before buying.
Finish and Troubleshoot
Near final thickness, reduce the cut to about 1/64 inch or less if the planer and material allow it. Recheck thickness across the width, not just at the center. If one edge is consistently thinner, the board may be skewing, the machine may need adjustment, or the reference face may not be flat. If tear-out appears, try a lighter pass and feed with the grain; figured wood may still require scraping or sanding.
Stop if the feed slows, the board chatters, or the motor labors. Unplug the machine before clearing a jam or inspecting cutters. If a board comes out with a new bow or cup, let it rest and acclimate before deciding how much more to remove; uneven moisture can cause movement after machining. Keep the final pass light, leave a little length for trimming snipe, and verify the finished piece with a straightedge and calipers before cutting it to final length.
