| Manufacturer | Bridgeport and Acra |
|---|---|
| Model | Vertical Knee Mill with Acra Head |
| Year | |
| Location | USA
|
This listing features a Bridgeport and Acra Vertical Knee Mill, combining the classic Bridgeport manual mill base with a variable-speed Acra milling head. The machine is designed for precision manual milling, drilling, and shaping of metal or plastic parts, suitable for maintenance, prototyping, and small to medium production tasks.
The Bridgeport base offers a stable platform with a work table measuring approximately 1219.2 mm (48 inches) in length and 228.6 mm (9 inches) in width. It provides travel distances of about 914.4 mm (36 inches) along the X-axis, 304.8 mm (12 inches) along the Y-axis, and 406.4 mm (16 inches) along the Z-axis (knee travel). Manual feeds for the X, Y, and Z axes are controlled via hand cranks, and the base is constructed from cast iron to ensure rigidity and vibration dampening.
The Acra milling head is a variable-speed spindle unit with a 2 HP motor, capable of speeds ranging from 60 to 4,500 RPM. It features a 3-speed power quill feed with rates of 0.0015, 0.003, and 0.006 inches per revolution. The head can tilt ±90° left and right and ±45° front and back, allowing versatile machining angles. The spindle taper is R8, compatible with a range of tooling.
Visibly, the machine includes a work table equipped with a vise and handwheels for manual control. The Bridgeport branding is present on the arm, and the Acra label is visible on the spindle head, confirming the components. The machine shows signs of use, with some surface wear and dirt, and is currently secured with straps and chains for transport. Metal shavings are present on the floor nearby, indicating recent use.
This combination of a Bridgeport base and Acra head provides a reliable and flexible milling solution for job shops, maintenance departments, and toolrooms requiring precise manual milling capabilities.
The following description has been generated using artificial intelligence based on the product information available. It is provided for guidance only and may not reflect all specifications or conditions. Please contact us if you need precise or confirmed details.
Specifications:
Table travel (X-Axis) 36”
Saddle Travel (Y-Axis) 12”
Quill Travel 5”
Knee Travel (Z-Axis) 16”
Ram Travel 12”
Throat Distance (Min.) 18.75”
Throat Distance (Max.) 6.75”
Standard 48” x 9”
T Slot center distance 3 @ 2.5” centers
T-Slot Size 0.625”
Cast Iron: 3/4"
Steel: 5/8"
Face Mill: 3"
End Mill: 3/4"
Spindle Taper: R8 Or Nt-30
Quill Diameter: 3-3/8"
Collet Capacity: 1/8" To 5/8"
Varaiable Spindle Speed: 60 To 4200 Rpm
Spindle Feeds: 0015, .0003, .0006 Inch/Rev
Spindle To Column: 5" To 17-3/8"
Motor: 3 Hp
Bridgeport Base
Table Size 9" x 42" or 9" x 49"
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
Acra Milling Head Specifications
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
Description:
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.
________________________________________
🔧Machine Overview
Base Machine: Bridgeport Vertical Knee Mill (Manual Mill Base)
Head: Acra Variable Speed Milling Head (Likely AM-2V or AM-2S)
________________________________________
✅ 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.
________________________________________
⚙️ 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
________________________________________
🏭 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
________________________________________
💡 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
________________________________________
📌 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.
Please note that this description may have been translated or optimized with artificial intelligence (AI) automatically. The information of this classified ad are only indicative. We recommend to check the details with the seller before a purchase.
| Client type | Factory – small or medium company |
| Active since | 2025 |
| Offers online | 17 |
| Last activity | Oct. 19, 2026 |
Specifications:
Table travel (X-Axis) 36”
Saddle Travel (Y-Axis) 12”
Quill Travel 5”
Knee Travel (Z-Axis) 16”
Ram Travel 12”
Throat Distance (Min.) 18.75”
Throat Distance (Max.) 6.75”
Standard 48” x 9”
T Slot center distance 3 @ 2.5” centers
T-Slot Size 0.625”
Cast Iron: 3/4"
Steel: 5/8"
Face Mill: 3"
End Mill: 3/4"
Spindle Taper: R8 Or Nt-30
Quill Diameter: 3-3/8"
Collet Capacity: 1/8" To 5/8"
Varaiable Spindle Speed: 60 To 4200 Rpm
Spindle Feeds: 0015, .0003, .0006 Inch/Rev
Spindle To Column: 5" To 17-3/8"
Motor: 3 Hp
Bridgeport Base
Table Size 9" x 42" or 9" x 49"
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
Acra Milling Head Specifications
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
Description:
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.
________________________________________
🔧Machine Overview
Base Machine: Bridgeport Vertical Knee Mill (Manual Mill Base)
Head: Acra Variable Speed Milling Head (Likely AM-2V or AM-2S)
________________________________________
✅ 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.
________________________________________
⚙️ 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
________________________________________
🏭 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
________________________________________
💡 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
________________________________________
📌 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.
Please note that this description may have been translated or optimized with artificial intelligence (AI) automatically. The information of this classified ad are only indicative. We recommend to check the details with the seller before a purchase.
This listing features a Bridgeport and Acra Vertical Knee Mill, combining the classic Bridgeport manual mill base with a variable-speed Acra milling head. The machine is designed for precision manual milling, drilling, and shaping of metal or plastic parts, suitable for maintenance, prototyping, and small to medium production tasks.
The Bridgeport base offers a stable platform with a work table measuring approximately 1219.2 mm (48 inches) in length and 228.6 mm (9 inches) in width. It provides travel distances of about 914.4 mm (36 inches) along the X-axis, 304.8 mm (12 inches) along the Y-axis, and 406.4 mm (16 inches) along the Z-axis (knee travel). Manual feeds for the X, Y, and Z axes are controlled via hand cranks, and the base is constructed from cast iron to ensure rigidity and vibration dampening.
The Acra milling head is a variable-speed spindle unit with a 2 HP motor, capable of speeds ranging from 60 to 4,500 RPM. It features a 3-speed power quill feed with rates of 0.0015, 0.003, and 0.006 inches per revolution. The head can tilt ±90° left and right and ±45° front and back, allowing versatile machining angles. The spindle taper is R8, compatible with a range of tooling.
Visibly, the machine includes a work table equipped with a vise and handwheels for manual control. The Bridgeport branding is present on the arm, and the Acra label is visible on the spindle head, confirming the components. The machine shows signs of use, with some surface wear and dirt, and is currently secured with straps and chains for transport. Metal shavings are present on the floor nearby, indicating recent use.
This combination of a Bridgeport base and Acra head provides a reliable and flexible milling solution for job shops, maintenance departments, and toolrooms requiring precise manual milling capabilities.
The following description has been generated using artificial intelligence based on the product information available. It is provided for guidance only and may not reflect all specifications or conditions. Please contact us if you need precise or confirmed details.
| Client type | Factory – small or medium company |
| Active since | 2025 |
| Offers online | 17 |
| Last activity | Oct. 19, 2026 |
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