#4904 Developing Cutting Dies for Implementation by Cut-n-Send
#4904 Developing Cutting Dies for Implementation by Cut-n-Send
https://sendcutsend.com/services/cnc-machining/
#4904 Descibe how I can use 3D design software and/or CNC design software to design cutting dies to be machined by https://sendcutsend.com/services/cnc-machining/
Designing cutting dies (such as clicker dies, rule dies, or embossing/debossing/leather stamping dies) for CNC machining through a service like SendCutSend requires adapting traditional die geometries to the constraints of subtractive 3-axis end-milling.
1. Select the Design Software
3D Parametric CAD (Recommended): Autodesk Fusion 360, SolidWorks, Onshape, or FreeCAD.
Best for solid billet dies (e.g., machined brass or D2 steel leather stamps, embossing dies, rigid cutting dies).
Allows exact draft angles, precise 3D fillets matching tool radii, and unified assembly verification.
2.5D / CNC CAD-CAM (Vector-based): Vectric Aspire/VCarve or Carbide Create.
Useful if creating simple prismatic profile dies or routing pockets/channels to press steel cutting rules into a plywood or composite base (rule die board).
2. Match Geometry to CNC Machining Constraints
SendCutSend’s CNC machining processes use standard rotating rotary cutting tools (typically 3-axis mills). You cannot achieve zero-radius internal corners or needle-thin cutting edges directly out of standard end-mill passes.
Tool Radius / Inside Corners:
A rotary end mill cannot cut a square internal pocket corner. If your die profile has interior sharp angles, you must model fillets equal to or larger than standard end-mill radii (e.g., minimum radius $\ge$ 0.031" / 0.8 mm, though 0.0625" / 1.58 mm is far more standard and cost-effective).
Alternatively, design dogbone or T-bone fillets at inside corners where clearance is required.
Cutting Edge Angle and Draft (Bevel):
True zero-thickness razor edges cannot be machined directly via standard 3-axis CNC without rapid tool dulling or chatter.
Model a bevel angle (draft angle) of roughly 30° to 45° on the cutting wall.
Leave a very small flat land (e.g., 0.005" to 0.010" / 0.12–0.25 mm) on the cutting crest in CAD, which can then be hand-honed or ground to a razor apex post-machining.
Aspect Ratios and Wall Thickness:
Thin, tall standing ribs vibrate under tool load. Aim for a maximum height-to-width aspect ratio of $3:1$ to $4:1$ for standing die walls.
Material Selection:
Select tool-grade or wear-resistant metals offered on their machining line, such as 6061-T6 Aluminum (good for soft materials like thin leather, craft foam, or prototypes) or Steel / Delrin depending on current material catalog availability and required tonnage.
3. Step-by-Step Modeling Workflow (Parametric 3D CAD)
Base Plate & Outer Perimeter:
Create a base plate (typically 0.25" to 0.5" thick) with mounting holes or dowel pin holes for arbor press or clicker press alignment.
Project the Cutting Boundary:
Sketch the 2D silhouette of the shape to be cut. Ensure all interior acute angles have applied radii.
Extrude or Taper:
Extrude the silhouette upwards from the base plate to your die height (e.g., 0.25" to 0.375").
Apply a Draft or Chamfer feature around the perimeter to generate the cutting blade profile.
Add Ejection Pin / Relief Holes:
Model through-holes inside the cut profile so you can pop cut parts out or install spring/foam ejectors.
Add Fastener Holes & Clearances:
Add counterbores or tapped holes if bolting the die to an upper ram plate.
4. File Export and Ordering on SendCutSend
Verify Solid Geometry:
Inspect the solid body for non-manifold edges, zero-thickness geometry, or unsupported undercuts.
Export File Format:
SendCutSend accepts standard neutral 3D files for machining: STEP (
.stepor.stp).
Upload & Specify Parameters:
Upload the STEP file to the SendCutSend app.
Select CNC Machining as the process.
Choose material, tolerance level, and specify any secondary operations (such as tapped threads or surface finishing).
Post-Machining Setup:
Once received, hone the cutting edge apex with a diamond file or whetstone to sharpen the edge, and glue high-density neoprene/ejection foam into the cavities to automatically push cut materials out.
Can 3D printers produce a cutting die with the appropriate design?
Yes, 3D printers can produce cutting dies, but their effectiveness depends entirely on the printing technology, material selection, and the material being cut (e.g., paper, clay, thin fabric, or vegetable-tanned leather).
Because polymers lack the tensile yield strength and edge retention of hardened tool steel, the geometry and workflow must be adapted specifically for additive manufacturing.
1. 3D-Printed Die Approaches
A. Direct Solid-Edge Plastic Dies (For Soft Materials)
Best For: Thin craft paper, polymer clay, dough, EVA foam, thin foil, or light fabric.
Mechanism: The cutting edge is printed directly as a wedge or chisel shape.
Limitations: Polymer cutting edges round off rapidly under heavy tonnages (such as an arbor or clicker press). Sharp, zero-radius apexes are fragile along layer lines.
B. Hybrid Dies: 3D-Printed Rule-Holding Base (Recommended for Production)
Best For: Leather, dense cardboard, gaskets, thick fabric, rubber.
Mechanism: Rather than printing the blade, you 3D-print a rigid, slotted baseplate (replacing traditional laser-cut die board plywood) with an exact kerf channel (e.g., 0.71 mm / 2 pt or 1.05 mm / 3 pt).
Execution: Standard hardened steel cutting rule is manually bent to shape and press-fit into the printed channels. This gives the edge life of hardened tool steel with the geometry and rapid turnaround of 3D printing.
2. Printer Technologies & Material Choices
| Technology | Recommended Materials | Best Application | Pros & Cons |
| FDM (Filament) | PA-CF / PA-GF (Carbon/Glass-Filled Nylon), PETG, Polycarbonate (PC) | Hybrid rule die bases, heavy-duty stamp blocks | Pros: High layer adhesion, structural toughness, cost-effective. Cons: Limited apex sharpness on direct edges; anisotropic shear along Z-layers. |
| SLA / MSLA (Resin) | Engineering / "Tough" Resins (e.g., Siraya Tech Blu, Formlabs Rigid 10K / Tough 2000) | Direct-edge dies for thin foils, paper, or clay | Pros: Isotropic strength, near-zero apex radius achievable. Cons: Brittle under shock/impact; risk of catastrophic shatter under misaligned press tonnage. |
| SLS / Metal 3D (Industrial) | PA12 (Nylon) or DMLS Tool Steel / Stainless (316L, 17-4 PH) | Production-grade direct dies or metal clicker dies | Pros: Fully dense, isotropic, industrial durability. Cons: Higher cost via service bureaus (e.g., Shapeways, Xometry, Protolabs). |
3. Critical Design Rules for Additive Cutting Dies
Bevel Angle & Land:
Pure vertical walls do not cut cleanly. Use a 30° to 45° single or double bevel.
Leave a small flat crest of 0.2 mm to 0.4 mm at the apex rather than designing to zero. Trying to print a true zero apex results in stringing or under-extruded jagged edges.
Print Orientation (FDM):
Never print tall cutting blades vertically if the cutting force acts perpendicular to the layers, as layer delamination will occur.
Print with the flat baseplate on the print bed so the cutting walls build vertically along the Z-axis, or use 100% infill with solid perimeters to maximize compressive strength.
Wall Thickness & Backing:
Ensure solid infill (90–100%) directly beneath cutting ridges.
Base plate thickness should be at least 6 mm to 10 mm to prevent flexing under press load.
Ejection Cavities:
Model through-holes in closed profiles so you can manually push stuck cutouts through, or insert closed-cell EVA/neoprene ejection foam.
4. Immediate Execution Checklist
For Soft Goods (Clay, Dough, Thin Paper):
Model in CAD using a 1.2 mm base wall tapering at 35° to a 0.3 mm tip.
Slice with 4–6 perimeters, 100% infill, at a layer height of 0.12–0.16 mm in PETG or Tough Resin.
For Heavy Goods (Leather, Gaskets, Canvas):
Measure the thickness of commercial steel cutting rule (standard 2-point rule is 0.71 mm thick; 3-point is 1.05 mm).
Model a 15 mm thick baseplate with a channel width clearance of +0.05 mm to +0.10 mm for an interference press-fit.
Print in PETG or PA-CF, press the pre-bent steel rule into the slot, and insert rubber ejection sponge blocks along the interior edges.
What are typical die sizes for creative uses?
Typical cutting die dimensions for creative applications are governed by standard raw material formats, consumer press throats, and the physical leverage of manual arbor or clicker presses.
1. Paper Crafting & Stationery (Standard Roller Presses)
These dies (typically etched chemically or cut from thin rule) are sized to match commercial cardstock and consumer roller machines (e.g., Sizzix Big Shot, Spellbinders Platinum).
A2 Card Fronts & Panels: 4.25 x 5.5 in (108 x 140 mm) — the standard US greeting card baseline.
A7 / 5x7 Invitation Panels: 5.0 x 7.0 in (127 x 178 mm).
Accents, Tags, & Sentiments: 1.0 x 2.0 in to 2.5 3.5 in (25 x 50 mm to 64 x 89 mm).
Maximum Throat Limit (Consumer Machines):
Standard feed width: 6.0 in (152 mm).
"Plus" / Large-format feed width: 8.5 to 9.0 in (216 to 228 mm).
2. Small Leather Goods (EDC & Leathercraft)
Small leather goods rely on modular, interlocking parts sized to standard pocket carry, cards, and folded currency.
Credit Card Slots & T-Pockets: 3.75 x 2.0 in to 4.0 x 2.25 in (95 x 51 mm to 102 x 57 mm).
Minimalist Cardholders / Wallets: 4.0 x 2.75 in to 4.25 x 3.0 in (102 x 70 mm to 108 x 76 mm).
Bifold Wallet Shells (Exterior Wrap): 8.5 x 3.25 in to 9.0 x 3.5 in (216 x 83 mm to 228 x 89 mm).
Key Fobs, Watch Straps, & Cable Organizers:
Widths: 0.75 to 1.5 in (19 to 38 mm).
Lengths: 3.0 to 6.0 in (76 to 152 mm).
3. Jewelry, Polymer Clay, & Metal Foil
Designed for high precision, hand-pressing, or light arbor strikes.
Earring Dangles & Studs: 0.5 x 0.5 in to 1.25 x 2.25 in (13 x 13 mm to 32 x 57 mm).
Pendants & Focal Pieces: 1.5 x 1.5 in to 2.0 x 3.0 in (38 x 38 mm to 51 x 76 mm).
Cuff Bracelet Blanks: 0.5 x 6.0 in to 1.5 x 7.0 in (13 x 152x mm to 38 x 178 mm).
4. Patchwork, Quilting, & Textile Appliqué
Textile dies use heavy-duty steel rules (often embedded in thick die board) to cut multiple fabric layers simultaneously without distortion.
Quilting Squares (Standard Blocks): 2.5 x 2.5 in, 5.0 x 5.0 in, and 10.0 x 10.0 in (Charm pack and layer cake standards).
Half-Square Triangles (HST): Sized to finish at 2.0 to 4.0 in per leg, with seam allowances integrated into the die line.
Embroidery / Morale Patches: 2.0 x 3.0 in to 3.0 x 3.5 in (standard Velcro/loop-backing footprints).
5. Physical Equipment Footprints & Depth Constraints
| Die Category | Footprint (X / Y) | Overall Height (Z) | Typical Press Mechanism |
| Thin Chemical/Machined Metal | Up to 8.5 x 11 in | 0.03 to 0.06 in (0.8 to 1.5 mm) | Roller press with acrylic cutting pads |
| Traditional Steel Rule Die | 4 x 4 in up to 24 x 36 in | 0.937 in (23.8 mm rule in 0.625 in wood) | Manual clicker press or hydraulic arm |
| Machined Billet / 3D-Printed Die | 2 x 2 in to 6 x 8 in | 0.375 to 0.75 in (9.5 to 19.0 mm) | 1-ton to 3-ton manual arbor press |
Next Concrete Steps
Verify Your Press Envelope:
If using a benchtop arbor press, measure the platen-to-base throat depth and maximum clearance height under the ram.
If using a standard roller die machine, establish your maximum width ceiling at 6.0 in (152 mm).
Apply Working Clearances in CAD:
Model a minimum 0.25 in (6.35 mm) solid margin between the outer cutting line and the exterior perimeter of the mounting baseplate to distribute press tonnage without edge deflection.
From <https://gemini.google.com/app/f7b9ef7caea3a1f3> Google Gemini (3.8 Flash)
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