Bridgeport Vertical Knee Mill with ACRA Head

Bridgeport-style vertical knee mill base that has been retrofitted with an Acra head—a fairly common and practical combination in machine shops when upgrading or repairing old Bridgeport machines.

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🔧Machine Overview

Base Machine: Bridgeport Vertical Knee Mill (Manual Mill Base)

Head: Acra Variable Speed Milling Head (Likely AM-2V or AM-2S)

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✅ Description – What It Does

This machine is a manual vertical milling machine used to:

• Cut, shape, and drill metal or plastic parts

• Perform tasks like face milling, slotting, keyway cutting, hole drilling, and contouring

• Handle prototype work, maintenance jobs, and precision machining of small to medium-sized parts

The Bridgeport base provides stability and smooth table movement, while the Acra milling head brings modern, reliable power and speed control.

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⚙️ Bridgeport Base Specifications (Typical)

Feature: Spec

Table Size: 9" x 42" or 9" x 49" (depends on model)

X-Axis Travel: ~30"

Y-Axis Travel: ~12"

Knee Travel (Z-axis): ~16"

Quill Travel :~5"

Spindle Taper: R8

Manual Feeds: X, Y, and Z via hand cranks

Power Feed (optional): May be installed on X-axis (varies by configuration)

Construction: Cast iron for vibration dampening and rigidity

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 🏭  Acra Milling Head Specifications (Assuming AM-2V or AM-2S)

Feature: Spec

Spindle Motor: 2 HP, 3-phase, 220/440V

Spindle Speed Range: 60–4,500 RPM (variable speed)

Spindle Taper: R8

Quill Feed: 3-speed power downfeed (0.0015, 0.003, 0.006 in/rev)

Head Tilt: ±90° left/right, ±45° front/back

Construction: Meehanite cast iron head casing

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💡  Capabilities

• Precision manual milling for small to medium parts

• Versatile use in maintenance, R&D, toolrooms, and prototyping

• Cuts steel, aluminum, plastics, and more with correct tooling

• Customizable with power feeds, DROs, or coolant systems

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📌 Listing Summary Description

Bridgeport Vertical Milling Machine with Acra 2 HP Head — This machine features the classic, rigid Bridgeport knee mill base with a modern, variable-speed Acra head retrofit. Ideal for precision manual milling, drilling, and light-duty shaping in maintenance or job shop environments. 9" x 42" table, R8 spindle taper, and 2 HP head with 60–4,500 RPM speed range.