Board Edgers Compared: Recovering Wany-Edge Value

Short answer

A board edger recovers wany-edge value by squaring both long edges of a sawn slab at a width you can actually sell. The edger class you buy decides how many passes that takes and how much width the operator gives away. A twin-blade edger on a common arbor squares both edges in one pass; a single-blade edger needs two. Most of the loss is in the trim allowance, not in the blade. JERRY builds twin-blade edgers with dual laser lines, anti-kickback chains and top return rollers, CE certified and shipped from Qingdao.

This article compares edger classes, not brands. No third-party specification is quoted below. Figures for our own machines come from our published product pages, read on 10 November 2026.

The three edger classes and what each one does with a wany edge

A wany edge is the rounded, bark-bearing surface left on the side of a board after the sawmill has cut two parallel faces. It is not a defect and it is not an operator error. It is the part of the log the band never touched. To sell that piece as dimension lumber, both edges have to be cut back to clean wood, parallel to each other, at a width the order names.

Edgers sort into three groups by how many cut planes they present to the board in a single pass.

• Single-blade edger. One circular blade, one fence. It squares one edge per pass, so a wany board needs two passes and has to be turned end for end between them.

• Twin-blade edger on a common arbor. Two blades on one shaft, spacing set to the finished width. Both edges are cut in the same pass, so the finished width is fixed by the blade set rather than by the operator’s eye. This is the arrangement we build: the portable hydraulic twin blade lumber edger.

• Multi-blade edger, three blades or more. A heavier arbor that can split a wide slab into two or more finished widths in one pass. Higher throughput, higher power demand, and the blade set has to be planned around the order rather than adjusted board by board.

What over-trimming costs, in board volume

The blade cuts where it is told. The waste is decided a second earlier, when the operator decides how much margin to leave. That decision is worth measuring, because it repeats on every board for years.

Worked example. Take a slab 3.0 m long, 250 mm wide and 25 mm thick, with 15 mm of wany and bark on each edge. Sound wood across the face is 250 mm minus 30 mm, so 220 mm. The order needs 200 mm.

• Set to 200 mm: 25 mm comes off each side. Both wany edges leave with 10 mm of margin. Volume shipped: 3.0 × 0.200 × 0.025 = 0.0150 m3.

• Set to 190 mm to be safe: 30 mm comes off each side. The board ships 10 mm narrow. Volume shipped: 3.0 × 0.190 × 0.025 = 0.0143 m3.

That is 0.00075 m3 per board, roughly 5 percent of the piece. The same pass is described step by step in board edger basics. Across 1,000 slabs it is 0.75 m3, which at 200 × 25 mm is 150 linear metres of board that went out as chips. Nobody notices one board. Everybody notices 150 metres.

Two habits stop it. Set the blade spacing to the width the order names, not to the width the last batch used. And give the operator a reference on the infeed that shows where each blade will enter before the board is pushed.

What decides recovery inside one class

Class sets the ceiling. Five details decide how much of that ceiling a yard actually reaches.

1. A reference at the infeed. Our edger projects two red laser lines onto the infeed table, one per cut plane. The operator can see whether both wany edges will clean up in this pass, or whether the wane runs deeper on one side and the board should be turned first. Without a reference, trim allowance becomes a judgement call, and judgement drifts with light and with the end of a shift. The limits of laser guide lines on a board edger are worth reading before you rely on them.

2. A chain that holds the board down. A heavy stainless chain hangs across the infeed. It keeps the slab tracking straight instead of skewing into the blade, and it blocks anything the blade tries to throw back at the operator. Skew is not only a safety matter: a board that enters at an angle leaves with a tapered edge and has to be run again.

3. Rollers that still turn. Stainless infeed rollers keep the feed smooth on wet timber. Plain steel rollers rust in a wet yard, and a roller that binds drags the board off line. On an edger the roller is a wear part, not trim.

4. Return rollers on top of the frame. This is the detail that decides whether two-pass edging happens at all, so it gets its own section below.

5. Spacing that changes in a minute. Width changes arrive with orders, not on a schedule. A geared handwheel and winch on the blade set makes a short run of a different width cheap enough to do properly, instead of edging everything to one width and sorting the pile afterwards.

Two-pass edging without lifting the board

Not every board cleans up in one pass. A thick slab, or wane that runs deep on both sides, needs a second cut. That is normal practice.

What makes it expensive is handling. On a plain edger the once-edged board leaves at the outfeed and has to be carried around to the infeed, either by a second person or by the same person lifting it off the stack. That is where two-pass edging quietly stops happening: the board is set aside, the next slab goes through, and the half-edged pile becomes a second shift.

Our edger carries idle return rollers across the top of the frame. The operator pushes the once-edged board back over the machine and drops it into the infeed. No lifting and no second operator, so one person can hold a two-pass rate.

Handling arithmetic, with the assumptions stated. If walking a 3 m board around the machine costs 20 seconds and rolling it back over the top costs 6 seconds, the difference is 14 seconds a board. At 200 boards a day that is 47 minutes. The 20 and the 6 are planning figures, not a stopwatch result from your yard; the ratio is the point, and your own numbers will move it.

Matching the edger to the mill, not to a catalogue

An edger is a downstream machine. It should be sized from what the sawmill produces, not from a specification sheet read on its own. Three numbers settle the match.

• The widest board your mill produces. The blade span has to cover it. If it does not, the widest boards take two passes every time they appear.

• The narrowest width you actually sell. Very narrow targets limit how many blades can be stacked on the arbor at usable spacing.

• Boards per hour at the mill's real feed rate. An edger that outruns the mill sits idle. One that lags becomes the bottleneck for the whole line. Size to the mill, then allow for the width mix.

Kerf belongs in the same calculation. Finished width plus the kerf of each blade has to fit inside the sound wood available. Kerf is a property of the blade you fit, so take that number from the blade supplier rather than from a brochure, and re-check it when you change blade type.

Drive, chassis and site constraints

Our edger is available with petrol, diesel or electric drive. Electric is the simpler choice where three-phase power already reaches the infeed and the machine stays in one yard: no fuel storage, no exhaust in a dusty workspace. Petrol or diesel is what you run where the edger follows the mill to a landing with no supply. When you ask for a configuration, give us the voltage and phase at the site, or the fuel you can store, and the socket type for your country.

Mobility matters more than it looks. Our edger sits on a road-rated chassis with highway tyres rated to 60 km/h, so it can be towed between sites behind a pickup instead of being craned onto a trailer. If the mill moves, the edger should move with it. A stationary edger at the wrong site is the same as no edger.

Guarding is not optional on a machine with an open blade set at chest height. The blade set outside the cut is guarded, and the anti-kickback chain across the infeed is the primary control: it holds the board down and stops the blade lifting it. Our machines carry CE certification, and the factory holds a TÜV Rheinland audit and Verified Custom Manufacturer status.

Emission documents follow the market, not the machine

On an engine-driven edger, the engine certificate has to match the destination market. Our petrol units can be supplied with EPA compliant engines for North America or Stage V compliant engines for the EU. Our diesel units are supplied with Stage V compliant engines and are not offered with EPA certification, so a North American order that needs an engine-driven unit should specify petrol or electric drive. Confirm the certificate for the country you are importing into before the order is placed, not after the container is booked.

What the sawmill leaves on the edge

Edging recovery starts upstream. Grit, sand and frozen dirt packed into bark blunt teeth faster than timber does, and a dull band leaves a rougher face that the edger then has to cut back further to reach clean wood. Our commercial sawmills can be ordered with a patented pre-cut debarker, a circular blade that opens the bark line ahead of the main blade so the main blade meets clean wood instead of embedded stone. It is a patented device on the sawmill, and it is specified at the sawmill, not at the edger.

The reverse also holds. The cleaner the sawmill's cut, the less the edger removes to reach a square edge, and the more width survives to the finished board.

What a squared edge changes downstream

Edging is usually discussed as a finishing step. It behaves like a grading step. A board with two parallel square edges can be stacked flat, measured for width, counted into a pack and dried without the pack sagging on a bark edge. It can be planed without the planer taking an interrupted cut on one side. It can be sold against a written width instead of a verbal one.

A board with a wany edge can do none of those things reliably, which is why it trades at a different price or goes to firewood. The edger is the cheapest station in the line for changing which of those two outcomes applies.

Questions buyers ask before ordering an edger

Do I need a twin-blade edger, or will a single blade do?

It depends on your width mix and who is available to feed the machine. A single-blade edger asks less of the arbor and the power supply, and it squares edges correctly, one edge per pass. If one person runs the yard, the second pass and the turn between passes are what get skipped on a busy day, so a twin-blade machine removes a step that is easy to postpone.

Can one person run a two-pass job on your machine?

Yes. The return rollers on top of the frame are there for exactly that. Two operators only become necessary when you feed boards faster than one person can turn them.

How do I know the wany edge will clean up before I cut?

Look at the laser lines against the board. If a line falls inside the wane, that edge will not clean up in this pass: turn the board, or plan two passes. The lines show position, not dimension, so the finished width still comes from blade spacing and a tape.

What width range can the edger be set to?

Blade spacing is set by handwheel and winch, and the usable range depends on how many blades the arbor carries and the kerf of the blade you fit. Send us the widest and the narrowest board you edge and we will confirm the blade count and spacing that covers the range, rather than quote a single figure that only fits the middle of it.

What is the minimum order and how does it ship?

MOQ is 1 set. Machines leave from Qingdao on FOB, CFR, CIF or EXW terms as you prefer. The factory is in Zibo, Shandong. Mixed orders of a sawmill plus an edger are quoted together, so the loading plan is worked out before the container is booked.

Key facts

• Function: squares both long edges of a sawn slab; the twin-blade common-arbor design cuts both edges in one pass.

• Second pass: idle return rollers across the top of the frame let one operator re-feed a board without lifting it.

• Alignment: dual red laser guide lines at the infeed, one per cut plane.

• Safety: stainless heavy-duty anti-kickback chain across the infeed; guarded blade set.

• Feed: stainless infeed rollers; geared handwheel and winch for blade spacing.

• Drive: petrol, diesel or electric.

• Mobility: road-rated chassis, highway tyres rated to 60 km/h.

• Certification: CE on the machines; TÜV Rheinland factory audit; Verified Custom Manufacturer.

• Emissions: petrol engines available EPA or Stage V compliant; diesel engines Stage V compliant.

• Trade terms: MOQ 1 set; shipped from Qingdao; FOB / CFR / CIF / EXW.

• Factory: Zibo, Shandong, China.

Next step

Send the widest and the narrowest board you edge, the lengths you handle, the power available at the site, and whether the machine has to travel. We will come back with the blade configuration that covers that range and a quote for the drive option you need.

jerry@jerry-sawmill.com | forest-machinery.com