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Drag Knife, Tangential Knife

Oooh! Sharp Objects! *coughs*

A Drag Knife. Name is fairly descriptive of its purpose. The Spindle drags the knife behind it, cutting through the surface material. The material has to be fairly thin (think X-Acto style blades) in order for this to work properly (having said that, some styles take a utility/boxcutter blade)

 

Thicker material you say? Plunge serrations needed? Enter the Tangential Knife.

Instead of freely rotating, a much stouter knife blade is held by a stepper motor, which is motion controlled to drag the blade through heavier materials.

Links

WidgetWorks Drag Knife (for Vinyl)

Tormach’s Spring Loaded CNC Drag Knife (Carbide Blade, made by WidgetWorks 🙂 )

Rockcliff Machine – Drag Knife (three carbide blades, each of differing angle)

Donek Tools Drag Knife

VIDEO – Platform CNC, Making and Using a Drag Knife (YouTube)

www.damencnc.com – Tangential Knife (NOT inexpensive)

Rockcliff Machines Project – Stepper Driven Tangential Knife