Description

Colchester Triumph Ainjest Unit

Overview
This is a high-speed screw-cutting / threading attachment (the “Ainjest” unit) designed to be fitted to a Colchester Triumph 2000 (or similar Colchester/Harrison lathes). The unit adds rapid, efficient threading capability to an existing lathe setup — turning a standard lathe into a more flexible and productive machine for screw-cutting operations. (As per a similar listing for an “Ainjest High Speed Threading Attachment” for Colchester/Harrison lathes.)

Key Features

• Rapid screw-cutting capability: The Ainjest unit allows the lathe to produce threads at higher surface speeds than standard leadscrew + feed-gear threading. This is especially useful when using harder tooling materials (e.g. tungsten-carbide) and when cutting threads quickly or in larger batches.

• Independent half-nut / auxiliary nut design: Rather than relying on the lathe’s normal apron half-nuts and the traditional threading dial, the Ainjest uses an auxiliary nut engagement system. This helps simplify the threading process and improve reliability / repeatability.

• Simplified setup & operation: The attachment is bolted to the right-hand face of the carriage/apron and can be engaged/disengaged with a control lever. Because of its design, it eliminates the need to time a threading-dial or manually coordinate engagement — making threading easier and safer.

• Flexible across metric and imperial threads: Versions of the Ainjest have been marketed for both imperial (Whitworth / BSP / inch-based) and metric screw-cutting — giving flexibility depending on what thread standard you need.

• High-speed capability to shoulder: According to contemporary sources, some Ainjest units allowed cutting heavy threads (e.g. large-diameter threads) at high rpm — reportedly e.g. a 2″-diameter, 12 TPI thread in four passes at high speed.