SCM Nova S 520 - Tersa 20" Planer

The SCM Nova S 520 T is a 20" industrial planer built in Italy — 11 HP 3-phase motor, monoblock welded base, powered table lift with digital readout, and a Tersa cutterhead with 4 straight knives. It is built for cabinet shops, millwork operations, professional furniture makers, and serious woodworkers who need a planer running at real production volume and want the best possible surface straight off the machine.

Requires 3-phase power (220V, 25A circuit). Confirm service availability before ordering.

At a Glance

• Tersa cutterhead — 4 straight knives, 520mm: Centrifugal locking — knives seat automatically when the machine starts, no tools required. Each knife is double-sided — rotate once before replacing. Change time under a minute per knife. Multiple alloy options including HSS and M42 cobalt for abrasive and resinous species.
• Best surface finish in the lineup: Tersa produces the finest surface straight off the machine when knives are sharp. The choice for artisan shops, fine furniture, and anyone where surface quality is the priority.
• 20.5" (520mm) working width: Handles lumber and edge-glued panels up to 20.5".
• 11 HP, 3-phase, 220V: Purpose-built production motor. 25A circuit required.
• Powered table lift with digital readout: 2-speed powered bed movement with micrometric fine adjustment. Set thickness precisely and use the readout as a reliable reference when returning to a previously used dimension.
• Monoblock welded base, heat-treated: Single normalized steel structure — all machine components mount and reference to one frame. The structural reason original S 520s from the 1990s are still holding tolerance in working shops today.
• 4 Acme-thread jack screws: Acme threads distribute load across a wider contact face than standard V-threads, resisting wear and table deflection under sustained load.
• 4 fixed feed speeds — 16, 26, 39, 59 FPM: Two speeds for rough stock removal; two for finish passes on demanding grain.
• Adjustable idle bed rollers: Raise for rough, heavy, or wet lumber to reduce feed resistance on initial passes. Lower flush with the table for finish passes where surface quality is the priority.
• 6" (150mm) dust port, 754 CFM minimum.
• Freight included; ships from U.S. warehouse

The Details

A planer's job is to thickness lumber and edge-glued panels to a consistent, accurate dimension — without snipe, without compression marks, and without variation across the width of the board. The Nova S 520 T is built around structural decisions that directly address those outcomes. Understanding them explains why this machine behaves differently from lighter-duty planers at any price point.

Tersa Cutterhead: The Tersa system uses four straight knives that lock by centrifugal force when the machine starts — no wrenches, no setting, no torque sequence. Slide the knife into its holder, start the machine, and centrifugal force seats it. Change time is under a minute per knife. When a knife dulls, it comes out in seconds and a fresh one goes in just as fast. Each knife is double-sided — rotate it once before replacing to get full use out of every edge. The result is a head that is almost never running on tired edges, which is exactly why Tersa produces the finest surface finish in this lineup. Sharp knives and fast changes keep surface quality consistent throughout the workday rather than degrading gradually between changes. Multiple knife alloys are available — standard HSS for everyday work, M42 cobalt for abrasive or resinous species where HSS dulls more quickly. Replacement knives can be ordered from OakTree at the time of purchase or on an as-needed basis.

Monoblock Base: The SCM Nova S 520 is manufactured in Italy, and the monoblock base is central to how SCM builds this machine to last. It is a single welded steel structure that undergoes normalization — a heat treatment process that relieves internal stress and stabilizes the metal. Every mechanism on the machine mounts and references to this single structure. With a machine built on a bolted or multi-piece frame, each component references to a different casting or weldment. Those joints shift under sustained load and vibration over time. With a monoblock base, there is no joint to shift. It is why S 520s built in the 1990s are still holding tolerance in working shops today.

Acme-Thread Jack Screws: The table rides on four Acme-threaded jack screws. Acme threads have a trapezoidal profile that distributes load across a wider contact face than the V-shaped profile of standard threads. Under continuous heavy use, this geometry wears more evenly and maintains table stability longer. SCM's design also prevents chain drive pressure from transferring directly to the jack screw shaft — eliminating a secondary source of table movement that contributes to snipe over the machine's life.

Connecting Rod Roller System: Both the infeed and outfeed rollers are mounted at the end of pivoting arms rather than on fixed axles. On a conventional planer, the infeed roller sits on a fixed shaft pressed downward by spring tension. As the board's leading edge pushes under it, the roller lifts straight up against that resistance — pressure is momentarily uneven and the board can hesitate or receive a compression mark from the infeed roller at entry. On the Nova S 520, each roller swings up along the arc of the connecting rod's pivot point rather than pushing straight up against fixed resistance. Pressure stays consistent through the full entry and exit — the board feeds through without hesitation and the roller leaves no entry or exit marks on the surface.

Idle Bed Rollers: Two adjustable idle rollers are set into the cast iron table and controlled by a lever on the infeed side of the bed. When raised slightly above the table surface, they allow rough, heavy, or wet lumber to feed through on initial passes without fighting resistance across the full table length. For finish passes, lower them flush with the table — the board then rides the full cast iron surface, which is the more stable reference for final thickness and surface quality. If you are getting snipe on finish passes, lowering the bed rollers is the first adjustment to make.

Feed Speeds: The four fixed speeds reflect how thicknessing work actually gets done. Rough stock comes off the saw with surface variability — in the early passes you are removing material unevenly. Running at 39 or 59 FPM through those passes is efficient. Once the board is consistent and you are working toward final dimension, 16 or 26 FPM gives a cleaner surface with less tearout on difficult grain. Match the speed to the stage of the work.

Powered Table Lift: Two-speed powered bed movement — fast for coarse positioning, slow for the micrometric fine adjustment needed to dial in a precise final thickness. The digital readout gives you a reliable reference to return to when running repeat dimensions. You set the dimension and note the readout; returning to it requires dialing back to that number manually.

Dust Extraction: 6" (150mm) port. Minimum 754 CFM required. This machine produces shavings at volume — make sure your collection system is genuinely up to the task before the machine arrives.

Do You Have a Jointer? A planer requires a flat reference face to work against. Without one, the planer reproduces any bow or twist in the lumber at consistent thickness rather than correcting it. If you do not have a jointer, the SCM Nova F 410, Nova F 520, and L'Invincibile F 7 are the appropriate machines to pair with this one.

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Frequently Asked Questions

Does this machine require 3-phase power?

Yes. The Nova S 520 T is a 3-phase only machine — 220V, 11 HP, 25A circuit. There are no single-phase variants in the Nova standalone planer lineup. Confirm 3-phase service availability, your panel's available amperage, and that you can run a 25A circuit to the machine's location before ordering.

SCM Nova S 520 Tersa vs Xylent: which cutterhead should I choose?

Tersa for cut quality. Xylent for production volume and lower maintenance frequency. Per SCM's own specs, the Xylent head runs 4dB quieter than Tersa — a difference most operators consider marginal. Tersa's advantage is surface finish: sharp straight knives produce the finest surface straight off the machine, and the fast knife change system means fresh edges are never more than a minute away. Where Xylent earns its place is in shops processing high volume on abrasive or resinous species, where carbide insert life significantly outlasts HSS knives and the finer chip output keeps dust collection running more efficiently over long sessions. For a shop where the best possible surface is the priority, Tersa is the stronger choice. The Nova S 520 X is the same machine with an SCM Xylent cutterhead.

What causes snipe, and how does this machine address it?

Snipe — the slight over-cut at the leading and trailing ends of a board — is primarily a function of table stability and roller behavior as the board enters and exits the cutterhead. The Nova S 520 addresses both: Acme-thread jack screws resist table movement under sustained load better than standard threads, and the connecting rod roller system keeps feed pressure consistent through the full entry and exit rather than momentarily uneven as the roller lifts. With proper setup, snipe on this machine is minimal. Lower the bed rollers flush with the table for finish passes.

What dust collection do I need?

754 CFM minimum through a 6" (150mm) port. This machine produces shavings quickly — verify your collector's rated output and that your ductwork is sized for a 6" connection before delivery.

Do I need a jointer to use this machine?

Yes, in practical terms. A planer references off the bottom face of the board. If that face has any bow or twist, the planer reproduces that geometry at consistent thickness — it does not correct it. A jointer establishes the flat reference face the planer works against. Without one, you cannot produce truly flat, dimensioned stock from rough lumber. The SCM Nova F 410, Nova F 520, and L'Invincibile F 7 are the appropriate jointers to pair with this machine.

SCM Nova S 520 vs SCMI S 520: what changed?

The Nova S 520 descends from the same design platform. The Nova version adds powered table lift, digital readout, and updated electronics that the older machines lacked. The community regards both generations highly — the pre-Nova machines are regularly cited on forums as machines people have run flawlessly for 20-plus years. The Nova adds meaningful daily-use convenience. The core structural advantages — monoblock base, Acme-thread jack screws, connecting rod roller system — carry forward from the original design.

What is the minimum stock size?

Minimum thickness is 0.12" (3.5mm). Minimum length is 8.7". Maximum working thickness is 11.75" (300mm).

Is shipping included?

Yes, shipping is included.

Is business financing available?

Yes. OakTree has partnered with First Citizens Equipment Finance to offer business financing on qualifying purchases. Financing is available to established businesses and can be applied for directly from any qualifying product page — look for the monthly payment estimate below the Add to Cart button and click through to submit a pre-approval application. If approved, a First Citizens representative will follow up to discuss payment terms.

Is this eligible for a Section 179 tax deduction?

Yes. The Nova S 520 T qualifies as a capital equipment purchase under Section 179, which allows businesses to deduct the full purchase price of qualifying equipment in the year it is placed in service rather than depreciating it over several years. For a machine at this price point, that deduction can meaningfully offset the net cost of purchase. The deduction limit and phase-out thresholds adjust annually, so the exact benefit depends on your total equipment purchases for the year and your tax situation. Consult your tax advisor on how Section 179 applies to your business. [link: See how much you could save with our Section 179 calculator. /pages/section-179]

Features

• Tersa Cutterhead — 4 Straight Knives, 520mm: Centrifugal locking — knives seat automatically on startup, no tools or setting required. Change time under a minute per knife. Each knife is double-sided — rotate once before replacing to get full use out of every edge. Multiple alloy options: HSS for everyday work, M42 cobalt for abrasive and resinous species. Replacement knives available from OakTree.
• Monoblock Welded Base, Heat-Treated: Single normalized steel structure — all machine components mount and reference to one fixed frame. No multi-piece frame joints to shift under sustained load and vibration over time.
• 4 Acme-Thread Jack Screws with Dust Protection: Acme threads distribute load across a wider contact face than standard V-threads, resisting wear and maintaining table stability under continuous production use. SCM's design prevents chain drive pressure from transferring directly to the jack screw shaft.
• Connecting Rod Roller System — Infeed and Outfeed: Each roller mounts at the end of a pivoting arm. As the board engages the roller, it swings up along an arc rather than lifting straight against fixed spring resistance. Consistent feed pressure through the full entry and exit — no hesitation, no compression marks from the infeed roller.
• Adjustable Idle Bed Rollers: Two idle rollers set into the cast iron table, controlled by a lever on the infeed side. Raise for rough, heavy, or wet lumber to reduce feed resistance on initial passes. Lower flush with the table for finish passes where the full cast iron surface provides the more stable reference. If snipe appears on finish passes, lowering the bed rollers is the first adjustment to make.
• Powered Table Lift, 2-Speed with Micrometric Adjustment: Fast mode for coarse positioning; slow mode for fine adjustment to a precise final dimension. Digital readout for reliable reference when returning to a previously used thickness setting.
• 4 Fixed Feed Speeds — 16, 26, 39, 59 FPM: Two production speeds for initial stock removal on rough lumber; two precision speeds for finish passes on demanding grain.
• Helicoidal Steel Infeed Roller, Power-Driven: Consistent grip across the full 20.5" working width through dense hardwoods and heavy stock.
• Rubber-Coated Outfeed Roller, Power-Driven: Clean release without marring the planed surface. Field-interchangeable.
• 6" (150mm) Dust Port: Minimum 754 CFM required.

Specs

Motor: 11 HP (8 kW), 3-phase, 220V
Circuit Required: 25A, 3-phase
Working Width: 20.5" (520mm)
Table Length: 35.37" (900mm)
Max Working Thickness: 11.75" (300mm)
Min Working Thickness: 0.12" (3.5mm)
Min Stock Length: 8.7"
Max Depth of Cut: 5/16" (8mm)
Cutterhead Type: Tersa — 4 straight knives, 520mm
Cutterhead Diameter: 4.7" (120mm)
Cutterhead Speed: 4,500 RPM
Feed Speeds: 16, 26, 39, 59 FPM (5, 8, 12, 18 m/min)
Infeed Roller: Helicoidal steel, power-driven
Outfeed Roller: Rubber-coated steel, power-driven
Bed Rollers: 2 adjustable idle rollers, standard
Table Support: 4 Acme-thread jack screws with dust protection
Table Lift: Powered, 2-speed with micrometric adjustment and digital readout
Base: Monoblock welded steel, heat-treated (normalized)
Dust Port: 6" (150mm)
Dust Extraction Minimum: 754 CFM (1,300 m³/h)
Overall Dimensions: 44.9" W × 39.5" D × 47.4" H (1,140 × 1,003 × 1,204mm)
Net Weight: 1,587 lbs (720 kg)
Shipping Weight: 1,737 lbs (788 kg)

Includes

• 4 Tersa knives, 520mm (installed)
• 2 adjustable idle bed rollers (installed)
• Operator's manual
• Tool set

Warranty

SCM warrants every machine free of defects in workmanship and materials for one (1) year from the date of customer acceptance. Belts, bearings, and common electrical parts carry a six-month warranty. Wearable items and components requiring maintenance in ordinary operation are excluded.

Shipping

Please note: Items being shipped to extremely remote areas or areas with limited delivery access (such as islands only accessible by ferry) may incur additional shipping or freight fees. If your order requires any additional fees other than what is already included in the price, you will be contacted before those fees are applied and before your item ships. This is rare and will not apply to most orders.

*Machinery Availability Key

Availability statuses found above the product description reflect where a machine is in the supply chain at the time of listing.

In stock for immediate shipment — Machine is in OakTree's warehouse and ships within normal lead time.

In stock / Low stock as of [date] — Machine is in the manufacturer's U.S. warehouse. Typical lead time 3–5 business days to OakTree, then ships to customer.

Estimated to ship [date] — Machine is not yet in a U.S. warehouse. Estimated date reflects current manufacturer guidance and is subject to change.

Dates are estimates only and are not guaranteed. OakTree Supply is not responsible for delays in transit or delays caused by the manufacturer or freight carrier.