CNC Digital Knife & Acoustic Fabrication

Acoustic PET Felt Baffle & V-Groove Folding Calculator

Calculate precision skin hinge thickness, V-groove top opening width, fold centerline shift allowance, oscillating knife feed rates, and multi-layer DXF toolpaths for CNC cutting acoustic PET felt wall panels and ceiling baffles.

1. Felt Panel & V-Groove Geometry

PET Felt Sheet Thickness (mm)

Target Folding Angle (°)

Skin / Hinge Retained Thickness (mm)

Uncut bottom backing felt retained to create a flexible origami hinge (typical 1.0 - 1.5mm).

Total V-Groove Linear Cut Length (Meters)

Combined length of all folding lines on the panel.

Total Perimeter Through-Cut Length (Meters)

Perimeter outer boundary cuts done with oscillating flat blade.

CNC Knife Tool Type

2. Calculated V-Groove & CAM Results

V-Groove Plunge Depth (Z-Depth): 10.8 mm

V-Groove Top Opening Width: 21.6 mm

Centerline Fold Shift Allowance: 1.20 mm

Required V-Blade Half-Angle: 45.0° (90° total V)

Oscillating Knife Feed Rate: 14,000 mm/min

Oscillating Stroke Frequency: 16,000 strokes/min

Estimated Total Cut Time: 2.8 minutes

Layer Strategy: 2 Tool DXF Layers

Shop Fabrication Guidelines

• Always perform V-groove cuts BEFORE through-perimeter cuts to maintain vacuum table hold-down.

• Apply hot melt adhesive or low-VOC contact cement into the V-channel during assembly for rigid baffle joints.

• Ensure vacuum hold-down zone valves are concentrated directly under the cutting area.

Mathematical Formulas for Acoustic Felt Folding

                V-Cut Depth = Total Thickness - Skin Thickness

                V-Cut Width = 2 * (V-Cut Depth) * tan(Fold Angle / 2)

                Fold Shift = Skin Thickness * tan(Fold Angle / 2)

Maintaining exact skin thickness (1.0mm - 1.5mm) is critical. If cut too deep, the PET fibers will separate and tear upon folding. If cut too shallow, the panel faces will bind at the vertex and bulge outward, preventing sharp 90-degree architectural edges.

Need DXF Toolpaths with Exact V-Groove & Cut Layer Separation?

Our AI vector engine separates architectural acoustic ceiling baffle sketches and wall patterns into dedicated layers: LAYER_VGROOVE_90 and LAYER_THROUGH_CUT with zero overlapping nodes.

Convert Acoustic Baffle Vectors (29 DKK)