To choose a blade for a CNC gasket cutter, the key considerations are the blade type, shape, thickness, and length, matched to the gasket material and its thickness.
Key Blade Types for Gasket Cutting
· Straight Blade: General-purpose, best for clean, straight cuts on rubber, non-asbestos, and similar materials.
· Hook Blade: Ideal for pulling through fibrous or tough materials like fiberglass or felt.
· Round (Drag) Blade: Best for flexible roll materials such as fabrics, leather, or filter cotton.
· Kiss-Cut Blade: For half-cutting layered materials (e.g., adhesive-backed gaskets), offers precise depth control.
· Bevel (V-Grooving) Blade: Used for angled cuts and slotting in foam or acoustic panels, good for angled grooves.
Blade Material and Properties
· Most oscillating blades for CNC gasket cutters are made of tungsten steel (carbide) due to its high hardness, wear resistance, and durability.
· This allows cold cutting without burning or melting, crucial for heat-sensitive gasket materials such as rubber or PTFE.
Blade Thickness and Length
· Thickness options commonly range from 0.63 mm (standard) to 1 mm or heavier for dense or multi-layer gaskets.
· Thicker blades provide durability but may reduce tight turning ability.
· The cutting edge length should be at least 5 mm longer than the gasket material thickness to ensure clean cuts.
Matching Blades to Gasket Materials and Thickness
· For rubber gaskets (1–5 mm): sharp-angle blades around 16°, 0.63 mm thickness are preferred.
· Non-asbestos gaskets (1–5 mm): blunt-angle or straight-edge blades about 1 mm thick.
· Graphite and reinforced gaskets may need reinforced blades with suitable angle and thickness.
· For adhesive gaskets, half-cut or kiss-cut blades ensure the backing is intact.
Choosing the right blade depends on the gasket material type, its thickness, and the desired cut precision. Oscillating tungsten steel blades with appropriate thickness, shape, and length are standard to achieve clean, precise cuts without heat damage.
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