CINCINNATI VERTICAL MILLING MACHINE

  Cincinnati No. 3 Vertical Milling Machine – Serial 4A3V5A-7

• Manufacturer: The Cincinnati Milling Machine Co., Cincinnati, Ohio, USA
• Year Built: 1953
• Electrical: 440V, 3-phase, 60 Hz (Control voltage: 110V AC)
• Type: Heavy-Duty Knee-Type Vertical Milling Machine – Dial-Type

Specifications

• Table size: 62.5" × 15.25"(T-slotted)
• Longitudinal travel: ~34"
• Cross travel: ~12"
• Vertical (knee) travel: ~20"
• Spindle taper: NMTB 50
• Spindle speed range: ~15 – 1,500 RPM (16-step Dial Selector)
• Spindle motor: ~10 HP AC
• Feed rates: 0.5 – 20 in/min (power feed)
• Rapid traverse speeds: Longitudinal ~100 IPM, Cross ~100 IPM, Vertical ~80 IPM
• Machine weight: ~9,500 – 10,500 lbs
• Floor space: ~8.5 ft × 9 ft

Key Features

• Dial-type speed selection for quick spindle changes
• Heavy-duty gear-driven feeds on all axes
• Rapid traverse to reduce non-cutting time
• Rigid overarm and spindle support for heavy cuts
• Large table capacity for big work pieces and multiple setups
• 50 taper spindle for high torque tooling

Typical Applications

• Mold and die base machining
• Large fixture and plate milling
• Production roughing and finishing
• Heavy steel plate slotting and facing
• General precision milling for large parts

Serial 4A3V5A-7

• “4A3V” = No. 3 Vertical, High-Speed Dial-Type, Model OM. This code maps to Cincinnati’s No. 3 vertical dial-type mill. 
• “5A” = order booked in 1953. In Cincinnati’s code, 5A corresponds to 1953 (post-1952 scheme). The digits before the dash give the year code. 
• “-7” indicates the sequence within that lot (the 7th machine of that booking). 

Key Specifications

• Manufacturer: The Cincinnati Milling Machine Co., Cincinnati, OH, USA
• Model: No. 3 Vertical Milling Machine – Dial-Type
• Serial Number: 4A3V5A-7
• Year Built: 1953
• Electrical: 440V, 3-phase, 60 Hz (110V control)
• Table Size: 62.5" × 15.25" (T-slotted)
• Longitudinal Travel: ~34"
• Cross Travel: ~12"
• Vertical (Knee) Travel: ~20"
• Spindle Taper: NMTB 50
• Spindle Speed Range: ~15 – 1,500 RPM (16-step dial selector)
• Spindle Motor: ~10 HP AC
• Feed Rates: 0.5 – 20 in/min (power feed)
• Rapid Traverse Speeds: Longitudinal ~100 IPM, Cross ~100 IPM, Vertical ~80 IPM
• Weight: ~9,500 – 10,500 lbs
• Floor Space: ~8.5 ft × 9 ft

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 Functions & Capabilities

• Precision milling of large and heavy work pieces
• All-axis power feeds for consistent, smooth cutting
• Quick spindle speed changes via dial-type selector
• Heavy-duty 50 taper spindle for large-diameter tooling
• Capable of face milling, slotting, drilling, boring, and profiling
• Handles both ferrous and non-ferrous metals

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Common Applications

• Machining mold and die bases
• Milling large plates and fixtures
• Slotting and facing heavy steel sections
• Precision boring and profiling of industrial components
• Production runs requiring repeatable accuracy

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Used In Industries Like

• Metal fabrication
• Tool and die making
• Heavy equipment manufacturing
• Aerospace and defense
• Energy and power generation
• Shipbuilding

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Summary Description

The Cincinnati No. 3 Vertical Milling Machine is a robust, industrial-grade milling solution built for precision and power. With its large table capacity, rigid frame, and quick-change dial-type speed system, it excels in demanding production environments. Its versatility, heavy-duty construction, and 50 taper spindle make it an ideal choice for machining large, high-tolerance parts in a variety of industries.

The Cincinnati No. 3 Vertical is a large-capacity, production-grade milling machine designed for heavy metal removal and precision machining on large workpieces. Its dial-type speed selector allows rapid changes in spindle RPM without belt changes. The robust knee and saddle construction provide high rigidity for both roughing and finishing cuts. This model was widely used in toolrooms, fabrication shops, and manufacturing plants for large part milling, mold bases, and fixture work.