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| Acrylic |
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Plastic type of material, often with trade names e.g. Perspex, Plexiglas and Oroglass. Used as alternative to glass. HSS cutters are recommended to machine this material for a superior finish. |
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| Aperture |
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An opening in a material or router base. |
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| Arbor |
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A spindle onto which a variety of slotting, slitting and grooving cutters can be mounted along with various spacers and a locking nut. A ball bearing may also slide on the spindle to act as a guide as an alternative to a side fence. |
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| Architrave |
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A moulded framework surround for doors, archways, etc. Architraves can be machined with a router or spindle moulder. |
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| Armature |
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Found on commutator (Carbon brush) motors. Includes the rotor, windings and commutator. In a router, the armature has a thread on one end which holds the collet and nut assembly. |
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| Arris |
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A sharp edge produced where two surfaces meet at an angle. |
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