CNC Knife Cutting for Engineered Materials
Digital flatbed knife cutting of 687+ engineered materials across 50 chemistries, driven directly from your CAD file (DXF or DWG) with no hard tooling to build. Drag-knife and oscillating (tangential) knife heads cut foams, rubber, gaskets, films, felt, cork, and tapes. Ideal for prototypes, short runs, large-format parts, and designs that change often. Cut to your drawing in Winsted, Connecticut.
Built for: prototype gaskets and seals, large-format foam and rubber parts, low-volume production, soft and thick cellular foams, and any part where a die would be an unnecessary up-front cost.
CNC knife cutting at H-O Products traces your CAD path through flexible material on a flat vacuum bed, with no die to build first. Two knife types cover the work: a drag knife for thin flexible stock and an oscillating tangential knife for soft, thick cellular foams and dense rubber. Because the geometry comes straight from the file, there is no tooling cost and no tooling lead time, which makes knife cutting the right choice for prototypes, short runs, large-format parts, and designs that change often.
H-O cuts 687+ materials across 50 chemistries and 8 families, from BISCO® silicone foam and PORON® urethanes to cork, felt, and tapes, under an ISO 9001:2015 certified quality management system in Winsted, Connecticut. See the process strip for lead-time and ordering details.
- Prototypes & first articles: parts cut from the CAD file with no tooling commitment, so revisions re-cut quickly
- Large gaskets & oversized seals: full-sheet cutting on the flat bed without a large dedicated die
- Short & intermittent runs: service parts, pilot builds, and low volumes where a die never amortizes
- Soft, thick cellular foams: the oscillating knife shears thick BISCO® and PORON® without die compression distortion
- Higher volumes: switch to flatbed or rotary dies once tooling pays for itself
- Thin films and features below roughly 0.020″: laser cutting is the right process
Digital knife cutting, converted in-house
CNC knife cutting uses a computer-guided knife, moving on a flat vacuum bed, to cut flexible engineered materials directly from a CAD file. There is no shaped tool to build first: the knife traces the part outline from your DXF or DWG, so a new geometry is ready as soon as the file is. H-O performs all of it in Winsted, then integrates adhesive lamination and finishing in the same workflow.
What makes the operation different is the depth of the material inventory and the material knowledge behind it. We stock materials from Rogers Corporation, Saint-Gobain, Henkel/Bergquist, DuPont, NeoGraf, Kaneka, Victrex, and dozens of other suppliers, and we maintain material-specific knife and pass parameters for each chemistry, grade, and thickness. When an engineer specifies BISCO® HT-800 or a 0.250″ neoprene sponge, we already know which knife head and how many passes hold the cleanest edge.
Digital knife cutting, contour cutting, and in-line adhesive lamination are performed in Winsted, CT. For high-volume production where per-part time matters, we typically recommend flatbed die cutting once a die pays for itself; for acrylic foam tapes at high volume, rotary die cutting; and for thin films and features below 0.020″, laser cutting. See the process comparison below.
Drag knife vs. oscillating (tangential) knife
Drag knife
A fixed blade that trails through the material, swiveling to follow the path. Fast and clean on thin, flexible stock: films, thin foams, gaskets, felt, cork sheet, and tapes. The default for most thin-material work.
Oscillating (tangential) knife
A powered blade that drives up and down while it steers to stay tangent to the path. The blade shears through thickness instead of dragging, so it handles soft, thick cellular foams and dense rubber that would compress or tear under a drag knife.
Multi-pass cutting
Thick or dense material is cut in several controlled passes rather than one deep stroke. This keeps the edge square, protects the blade, and avoids the compression distortion a single hard plunge would cause.
The head is matched to the material, not the other way around. A 0.020″ PORON® pad or a sheet of cork cuts cleanly with a drag knife in one pass; a 0.375″ soft BISCO® sponge needs the oscillating knife and several passes so the foam shears rather than folds under the blade. Thin films below 0.020″ features are better suited to laser cutting.
When knife cutting wins, and when a die wins
Knife cutting and die cutting cut many of the same parts. The trade is simple: a knife has no tooling cost but is slower per part, while a die costs money up front but is faster once it exists. Quantity and material decide it.
- Choose knife cutting for prototypes and design changes
- With no die to build, a revised drawing becomes a revised part in the same workflow, with no scrapped tooling. This is the right process while a design is still moving, or when you need first parts before committing to a die.
- Choose knife cutting for short runs
- At low quantities the tooling cost of a die never amortizes, so cutting straight from the file is the lower total cost. As volume rises, the per-part speed of a die wins; see the comparison below for the typical crossover.
- Choose knife cutting for large-format parts
- Large gaskets, full-sheet liners, and oversized seals cut cleanly on the flat bed without a correspondingly large and expensive die. Big parts are where the no-tooling advantage is largest.
- Choose knife cutting for soft and thick cellular foams
- The oscillating knife shears soft, thick foam with controlled passes, avoiding the compression distortion a die press can cause on the same material.
- Choose a die for higher volume
- Once quantities are high enough for the tooling to pay for itself, flatbed die cutting is faster per part and lower total cost. For acrylic foam tapes at high volume, rotary die cutting is lower still.
- Choose laser for thin films and fine features
- For thin dielectric films and features below roughly 0.020″ that a knife or die cannot hold, laser cutting is the right process.
| If your requirement is | Material family to start from | Knife and mode | Tolerance frame to confirm |
|---|---|---|---|
| Thin adhesive pad on liner, low volume | PSA-laminated film or thin foam | Drag knife, kiss-cut | ±0.010″ to ±0.015″ |
| Thick soft foam gasket, prototype | Open-cell or soft closed-cell foam | Oscillating knife, through-cut | Material/thickness dependent |
| Dense rubber or felt with tight corners | EPDM, neoprene, or felt | Tangential knife | ±0.015″ (review) |
| Fast revision before tooling | Any knife-suitable stock | Drag or oscillating, no tool | From file, no tooling |
| Fine feature or high volume | Thin film or production gasket | Route to laser or die | Feature/volume dependent |
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1Send drawing & materialShare a DXF, DWG, PDF, or STEP with the material callout, thickness, critical tolerances, and any adhesive or liner spec. A sample part works too.
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2DFM & knife reviewEngineering reviews the part for manufacturability and selects the knife head (drag or oscillating) and pass count against material, thickness, and feature detail.
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3PrototypeSamples typically 3-5 business days for common configurations, with no tooling to build first. Standard production 2 weeks; special orders run custom lead times.
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4ProductionKnife-cut, laminated, and finished to drawing in one coordinated workflow, with first-article inspection and lot-code traceability carried through the run.
Send the part and get a DFM review
If your drawing has the material, thickness, and critical dimensions, send it over. Engineering reviews manufacturability, selects the knife head, and comes back with a quote. No tooling needed to get started.
What we knife-cut, and for whom
Knife-cut gaskets, large-format seals, prototypes, and low-volume parts ship into medical, aerospace, defense, electronics, industrial, energy, and transportation programs.
- Prototypes & first articles
- First parts from a CAD file with no tooling commitment, so a design can be tested, revised, and re-cut quickly. The fastest path to a physical part while a drawing is still moving.
- Large gaskets & seals
- Oversized environmental, flange, cabinet, and enclosure seals cut on the flat bed without a large dedicated die, from soft BISCO® sponge for low-closure-force enclosures to dense EPDM and neoprene for high-load flanges. From our catalog: BISCO® 7304 silicone sponge · kSil® US400.
- Low-volume production
- Short and intermittent runs where a die would never amortize, including service and spare parts, pilot builds, and made-to-order configurations cut to your drawing.
- Soft, thick foam parts
- Thick BISCO® and PORON® cushions, pads, and seals cut with the oscillating knife and controlled passes, avoiding the compression distortion a die press can cause on the same soft, thick stock. From our catalog: PORON® AquaPro® 4701-41 · PORON® Medical Firm.
Large-format silicone-sponge enclosure gaskets in a soft 0.375″ grade: oscillating knife with controlled multi-pass cutting to keep the edge square on thick foam, parts cut straight from the customer DXF with no tooling so revisions ship the same workflow. Quality systems are built for medical, aerospace, and defense programs, with lot traceability typically retrievable in under 2 hours.
CNC knife cutting questions
Common questions from engineers speccing knife-cut parts.
What is CNC knife cutting?
A computer-guided knife moves on a flat vacuum bed and cuts flexible material directly from your CAD file (DXF or DWG). There is no shaped die to build first, so the part is ready as soon as the file is. We run two knife heads: a drag knife for thin flexible stock and an oscillating tangential knife for soft, thick foams and dense rubber.
What is the difference between a drag knife and an oscillating knife?
A drag knife is a fixed blade that trails through the material and swivels to follow the path, which is fast and clean on thin, flexible stock such as films, thin foams, felt, cork, and tapes. An oscillating tangential knife drives the blade up and down while steering it tangent to the path, so it shears through thickness and handles soft, thick cellular foams and dense rubber. We select the head during drawing review.
When should I choose knife cutting instead of die cutting?
Choose knife cutting for prototypes, frequent design changes, short runs, large-format parts, and soft thick foams, because there is no tooling cost and a revised drawing becomes a revised part with no scrapped die. Choose die cutting once quantities are high enough for the tooling to pay for itself, because a die is faster per part and lower total cost at volume.
Is there a tooling cost for knife cutting?
No. The cut path comes straight from your CAD file, so there is no die to build and no tooling lead time before the first part. That is the central advantage over die cutting for prototypes and short runs. The trade is that knife cutting is slower per part, so at higher volume a die becomes the lower total cost.
What materials can H-O Products knife cut?
Flexible materials from the 687+ SKU inventory: BISCO® silicone foam, PORON® and HyPUR-cel® urethanes, solid silicone, neoprene, EPDM, nitrile and Viton® rubber, cork, SAE felt, gasket papers, thin films and laminates, EMI and thermal materials, and acrylic foam tapes and adhesives. The oscillating knife is especially strong on soft, thick cellular foams.
Related converting capabilities
Knife cutting sits inside a connected set of in-house converting capabilities. These pages cover the adjacent processes that often share the same drawing.
Capability overview
Converting & Fabrication
The parent hub: how die cutting, knife cutting, laser, rotary, slitting, and profiling fit together, and which process suits which part, material, and volume.
Read the overview
Related capability
Flatbed Die Cutting
The higher-volume counterpart.
Read the page
Related capability
CNC Laser Cutting
No-tooling cutting for thin films and fine features below 0.020″.
Read the page
For an accurate quote, include the following with your drawing or sample:
- DXF
- DWG
- STEP
- Material callout
- Thickness
- Critical tolerances
- Adhesive or liner spec
Request a knife-cutting quote
Send a drawing, a sample part, or a description of the part. Engineering reviews manufacturability, selects the knife head, and comes back with a quote. Prefer to start with a conversation? Contact our engineering team directly.
Material data & standards. Material properties, temperature ranges, tolerances, and knife-cutting parameters referenced on this page are taken from the source manufacturers' technical data sheets and the cited industry references. H-O Products converts and cuts these materials; we do not independently re-certify them against the standards unless explicitly stated on the quote. Achievable tolerance is geometry-, material-, and knife-dependent.
Verify against your application and the vendor TDS for your specific construction. Lot-specific documentation is available on request.
Capability scope. Digital CNC knife cutting, contour cutting, and in-line adhesive lamination are performed in-house in Winsted, CT. Lead times and minimums vary by material, knife head, and construction; expedited handling can be arranged.