Why is the 90-degree inner corner clipped with a small chamfer?

When two steel tubes or extrusions are welded together at 90°, the interior corner contains a raised weld bead. Clipping the inner apex of the gusset plate (`C_weld`) allows the gusset to sit 100% flush against both tubes without hitting the weld.

What bolt hole diameter (H) should I use for 2020, 3030, and 4040 aluminum extrusions?

Use H = 5.3mm to 5.5mm for 2020 V-Slot/T-Slot profiles (M5 screws), H = 6.5mm for 3030 profiles (M6 screws), and H = 8.5mm to 9.0mm for 4040 profiles (M8 screws).

Can I make an asymmetric gusset plate (e.g., 150mm × 90mm)?

Yes! Simply set Horizontal Leg L = 150mm and Vertical Leg W = 90mm; the hypotenuse and bolt hole arrays along each leg adjust independently.

Are the bolt holes exported as clean closed circles in DXF?

Yes, every bolt hole is exported as a closed 36-segment LWPOLYLINE circle on the RED CUT layer for instant lead-in generation in SheetCam, CypCut, or LightBurn.

TEMPLATE ID: PRE-SHT-005 120 × 120 × 14 mm (T=4mm) Pre-Verified 1:1 Static Files Ready

4040 Series T-Slot Aluminum Extrusion 5-Hole 90° Corner Gusset Joining Plate (M8 / 4mm Plate)

Interactive Parametric 2D & 3D Studio

Live 2D Dieline, Interactive 3D Fold Preview & Custom Size Generator

Pre-loaded with 4040 Extrusion 90° Gusset Plate (120×120×14 mm, T=4mm)

1:1 CAD ENGINE READY

4040 Series T-Slot Aluminum Extrusion 5-Hole 90° Corner Gusset Joining Plate (M8 / 4mm Plate)

1CAD Style & Material SetupSheet

Select CAD Style / Model (36)Search & Filter

Material Stock Preset (Auto-Sets Caliper T & Kerf K)

Display Units

Scale Lock

1:1 True Scale

2Dimensions (1:1)Millimeters (mm)

Horizontal Leg A Length (mm)120 mm

Vertical Leg B Height (mm)120 mm

Fastener Bolt Hole Ø (mm)14 mm

Thickness (T mm)

Laser Kerf (K mm)

3Brand Logo & 1:1 ExportZero Login

2D & 3D Brand Logo Mockup:

📤 Upload Logo

Print Artwork Bleed Guide:

Embed Spec Sheet & 50mm / 1" Scale Bars (Added on separate DIMENSIONS layer)

Pre-Flight Geometry Audit8/8 PASSED

PASS
Closed Outer Contours: 6 closed LWPOLYLINE cut loop(s) verified
PASS
Zero Duplicate Cut Paths: 114 unique segments (0 laser double-burns)
PASS
Flute & Kerf Tolerance Guard: T=4.00mm, K=0.100mm within structural limits
PASS
ISO Layer Color Separation: CUT (Red), CREASE (Blue), SCORE (Emerald), DIMENSIONS isolated
PASS
1:1 Physical Unit Header: Explicit mm/in SVG viewBox + DXF $INSUNITS=4 + 50mm PDF bar
PASS
Exact 2D Cut Bounding Parity: Cut Bounds 120×120mm === Blank Size
PASS
2D ↔ 3D Kinematic Model Sync: Archetype 'corner_gusset_plate' synced (1 3D component(s))
PASS
True Vector Sheet Nesting Sync: 1:1 vector paths mapped to multi-up sheet grid

100%

CUT (0.69m) CREASE/SCORE (0.00m)● 6 Loops · Est. Cut: ~40s

1:1 Synced · Blank: 120 × 120 mm

2D 1:1 Unfolded Vector BlueprintBlank: 120 × 120 mm (4.72" × 4.72")

3D Interactive Fold & Orbit (Kraft Board)

80%

0%100%

Camera:

Yaw: -28°Pitch: 24°

⟳ Drag Anywhere to Rotate 3DL=120 × W=120 × H=14mm

Gusset Legs (A × B)

120.0 × 120.0 mm

Weld Root Chamfer

19 × 19 mm (45°)

Diagonal Hypotenuse

149.9 mm

Fastener Bolt Bores

4 × Ø14.0 mm

Direct Pre-Generated 1:1 CAD Files

Download Static Ready-to-Cut Files (120×120×14 mm)

These static files are pre-calculated for 4mm material thickness and 0.1mm laser kerf. Click any format below to download the pre-built static file, or export custom dimensions directly from the interactive Studio above.

↓ Download .DXF AutoCAD / LightBurn ($INSUNITS=4) ↓ Download .SVG Illustrator / Corel (1:1 mm) ↓ Download .PDF 1:1 Print + 50mm Scale Bar

Product Manufacturing Specification Sheet

Calibrated Physical Clearances & Material Stock for 4040 Extrusion 90° Gusset Plate

Parent Parametric Engine: 90° Corner Gusset Plate →

Target Physical Product Size

Fits Standard 40 × 40 mm T-Slot & V-Slot Aluminum Extrusion Framing (120 × 120 mm Legs)

Engineered Internal Cavity & Clearance

9.6 mmInner Weld/Corner Chamfer + 5 Orthogonal Fastener Holes Along Center T-Slot Axis

Recommended Board / Sheet Stock

4.0mm–6.0mm 6061-T6 Aluminum Plate or 4.0mm Mild Steel Plate

Grain / Flute Orientation Rule

Isotropic Rolled Metal Plate

Production Engineering Note: Ideal for CNC router gantries, sim-racing cockpits, and heavy machine enclosures.

Structural Geometry & Material Reference (EN 1993-1-8 (Eurocode 3) Gusset Joint & V-Slot / T-Slot Extrusion Standard)

Structural 90-degree corner gusset plates—used to brace welded steel tube frames, CNC machine gantries, and 2020/3030/4040 T-slot aluminum extrusions—require an inner apex relief chamfer so the plate sits flush past the weld bead or corner fillet, plus accurately pitched bolt hole arrays along both orthogonal legs. Our parametric corner gusset generator builds a symmetric or asymmetric right-angle triangle plate (`L × W`) with a clipped inner weld-relief chamfer, truncated safety tips on the outer corners, and 5 precision bolt holes (`Ø = H`) aligned along both structural axes.

Hypotenuse Brace Length (L_hyp)

L_hyp = sqrt(L_legX^2 + W_legY^2)

Determines the diagonal tension/compression brace edge connecting the two orthogonal structural legs.

Inner Weld-Bead Relief Chamfer (C_weld)

C_weld = max(6.0 mm, min(L, W) * 0.08)

Clips the 90° inner origin corner at 45° so the gusset clears interior corner weld beads without grinding.

Edge Distance Margin for Bolt Holes (e_min)

e_min = max(14.0 mm, D_hole * 1.8)

Places the fastener pitch line far enough from the plate edge to prevent shear tear-out under Eurocode 3.

Internal CAD Silo & Related Ready-to-Cut Templates