Oscillating knife tools for CNC cutting · Motor-driven heads that move a blade up and down at high frequency — for example 1–3 mm stroke at 2,600 strokes/min to 12,000 rpm — to cut foam boards, corrugated board, sealing materials and textiles on flatbed and gantry cutters
An oscillating blade assembly drives a knife rapidly up and down while the CNC moves it along the cut path, to cut materials such as foam boards, corrugated board, sealing materials and textiles. It mounts on the cutting head of a flatbed cutter or the tool holder of a gantry machine. Ask three things first: what materials and thicknesses must be cut, which stroke, frequency and blade shapes suit them, and how the tool mounts, is powered and is controlled on your machine.
Oscillating knife tools and heads, with their blades, for CNC flatbed cutters and gantry routers cutting foam, board, gaskets, textiles and similar sheet materials. Complete CNC fabric cutters (see automatic fabric cutting machine) and leather cutters (see automated leather cutting system), laser and waterjet heads (see cutting head), hot-wire foam cutters and hand-held oscillating multitools are outside this page except where compared.
CNFX editorial research · Sources checked October 12, 2026 · 4 sources
AirMark lists Summa's electronic oscillating tool (EOT) as driven by an electric motor at up to 12,000 rpm (200 Hz) with a 1 mm (± 0.5 mm) stroke and 0.64 mm thick knives, able to cut materials up to 24 mm thick — thick materials such as corrugated cardboard and foam boards, and thinner ones such as solid cardboard and textiles — with knife types from OT 65° L25 to OT 45°–85° L38. [1]
StepCraft's OTK-3 oscillating tangential knife clamps into the tool holder of a CNC gantry machine and lists a 3.0 mm stroke, a maximum stroke rate of 2,600 strokes per minute with oscillating modes of 1,300 and 2,000 strokes and a grooving mode, and a stroke force of 90 N at the maximum rate, for sealing materials and hard foam boards. [2]
Editorial calculation: 2,600 strokes per minute is about 43 strokes per second; at 200 Hz with a 1 mm stroke the blade travels about 0.4 m of up-and-down motion per second (2 × 1 mm × 200). [2][1]
Zünd, a digital cutter maker, offers its Electric Oscillating Tool (EOT) for soft to medium-density and multilayered materials in two versions, with a 0.5 mm or a 1.0 mm stroke, and pairs it with flat and pointed oscillating blades for different substrates and levels of detail. For honeycomb display board, thick cardboard and tough leather it offers the EOT-250 with an extended 2.5 mm stroke and an air-cooled motor. Both tools are listed as compatible with its G3, S3, L3 and D3 cutters. [3][4]
Editorial calculation: the published strokes in this page's sources range from 0.5 mm to 3.0 mm, a sixfold spread; ask which stroke the supplier proposes for each of your materials and thicknesses, and whether the head can be swapped on the same cutter. [3][2]
Give the supplier the cutter make and model and tool interface, the materials and maximum thickness, required edge quality and minimum radius, cutting speed targets, blade shapes and lengths needed, power and control signals available, and expected blade consumption.
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Choose blades, mounting and power
The OTK-3 has a 6.0 mm tool shaft, a 43 mm clamping diameter, 98 × 52 × 160 mm dimensions, a weight of 1.08 kg without knife and cable, and a 30 V supply; blades are sold separately, and use with a switch box needs an add-on module. [2] The Summa EOT is supplied with one knife and blade safety caps, with further knife angles and lengths available. [1]
Ask which blade lengths the maximum cutting depth needs and how the head mounts and is controlled on your cutter.
03
Questions to put to any knife-tool supplier
Ask any supplier for stroke and frequency range, stroke force, maximum cutting depth, blade families and blade material, tool interface and compatibility with your cutter, power supply and consumption, weight, cooling, noise, and spare blade prices.
Blade length and thickness, stroke, frequency, voltage and weight come from the AirMark, Zünd and StepCraft documents above; accuracy, power and environment rows need the supplier to answer.
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
How thick can an oscillating knife cut?
Summa's EOT lists up to 24 mm with its current knives. [1]
What stroke do oscillating knife tools use?
The tools reviewed list 1 mm (Summa EOT) and 3.0 mm (StepCraft OTK-3). [1][2]
Which materials suit an oscillating knife?
Listed materials include foam boards, corrugated and solid cardboard, textiles and sealing materials. [1][2]
Which stroke suits thick cardboard or leather?
Zünd offers its EOT with 0.5 or 1.0 mm stroke for soft to medium-density materials and the EOT-250 with a 2.5 mm stroke for honeycomb board, thick cardboard and tough leather. [3][4]
Sources and what still needs a direct check
Sources checked 2026-10-12. StepCraft makes CNC machines and tools; Summa's oscillating tool data comes from reseller AirMark.
