GMC Metal Lathe Tooling & Accessory Lot

• Heavy Duty Precision Gap Metal Lathe 4-1/8" Spindle Bore, 15HP.
• High-Quality Used GMC Precision Gap Bed Engine Lathe (Heavy Duty) 
• Model GT-26120 26” x 120”  Sino Dro Model SD S6-2V 
• 4 Jaw Chuck, Taper Attachment, Face Plate, 3 Jaw Chuck, and Follow Rest. 
• Inch - Metric Threading capabilities, equipped with 2-Foot Brakes for added safety.
• Steady rest
• 4-jaw chuck
• Taper attachment
• Faceplate
• 3-jaw chuck
• Follow rest
• Swing Over Bed: 26 in
• Swing Over Cross‑Slide: 17¼ in
• Maximum Swing in Gap: 34–35⅜ in
• Swing Over Gap (across jaws): ≈ 35¼ in
• Distance Between Centers: 120 in
• Spindle Bore: 4⅛ in (D1-8)
• Spindle Taper: MT5
• Power:15 HP main motor (220/440 V, 3ø)
• Spindle Speeds:16 speeds, ranging from 25–1,600 RPM
• Rapid Traverse:Yes, with 1 HP rapid-traverse motor
• Feed Rates: Longitudinal: 0.0016–0.055 inch per revolution (25 options) Cross: 0.0008–0.027 in/rev (25 options)
• Threading: 54″ – 7/16 TPI (inch) and 0.45–120 mm (metric)
• Guideways:  Hardened and precision-ground; 16″ wide bed with induction hardening
• Spindle Support:Re-balanced, hardened, 3‑point bearing support
• Mechanical spindle clutch (forward/reverse, brake) 
• Oil lubrication system on headstock and feed box
• Removable bed gap with sub-spindle travel: 9″ to spindle center, 4½″ to chuck jaws 
• Saddle features 4-way toolpost, carriage stop, foot brake
• Coolant system, halogen work light, full-length splash guards

Standard tooling:

• 12″ 3‑jaw & 16″ 4‑jaw chucks
• 18–25″ faceplate
• Steady & follow rests
• Taper attachment, thread chasing dial, dead centers, toolbox
• Bed Width:~16″
• Tailstock Quill: 3½″ diameter, travel 9¼″, taper MT5 
• Cross Slide Travel: ~14½″; Top Slide: ~9″
• Weight:~9,500 lb
• Overall Size: 187″ × 46″ × 72″ 

The GMC GT 26120 is a high-capacity, heavy-duty engine lathe designed for machining long or large-diameter metal workpieces with exceptional accuracy and torque. With a 26” swing over bed and 120” center distance, this lathe is ideal for industrial applications that require turning, facing, threading, boring, tapering, and parting of metal bars, shafts, rollers, and cylindrical components.

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What It Does

The GT-26120 performs a full range of manual lathe operations on various materials—primarily steel, aluminum, brass, stainless, and cast iron. It is used to:

• Turn (reduce diameter) of large parts
• Face components to create flat ends
• Cut threads (metric/inch)
• Bore holes concentrically into existing holes
• Taper-turn parts using the compound rest or tailstock offset
• Part off material to desired lengths

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Key Specifications & Capabilities

Model:GT-26120

Swing Over Bed 26″

Swing Over Cross Slide ~15″–18″ (varies by version)

Swing in Gap: Up to 36″ (for large flanges/disks)

Distance Between Centers: 120″

Spindle Bore 4.125″ (105 mm) — ideal for heavy bar stock

Spindle Speeds 12 speeds: 25 – 1,800 RPM

Spindle Nose D1 8 Camlock

Bed Width:15″

Feed Range 0.0015 – 0.0915 IPR (longitudinal & cross feeds)

Threading Capability Inch: 4–56 TPI; Metric: 0.4 – 7 mm

Tailstock Quill Travel ~6″, MT #5 taper

Motor: 10 HP, 220V / 3PH

Weight: ~9,000–10,000 lbs (approximate)

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Digital Readout System (SINO DRO Model SD S6 2V)

The included SINO SD S6 2V is a professional-grade 2-axis digital readout (DRO) system that enhances operator precision and reduces errors in length and diameter measurements.

Features:

• Real-time position tracking (X and Z axes)
• Inch/metric switchable
• Preset, pitch circle, and radius/diameter functions
• High-resolution display and zero reset

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Core Functions

Turning: Reducing part diameter via longitudinal movement

Facing: Creating flat surfaces perpendicular to the part axis

Thread Cutting: Internal/external threading (inch & metric)

Taper Turning: With compound rest or tailstock offset

Boring: Internal diameter enlargement

Parting: Cutting off sections with precision

Grooving: Cutting recesses or grooves

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Machine Construction & Features

• Induction-hardened and precision-ground bedways
• Removable gap bed section for large-diameter faceplate work
• Hardened gears and precision spindle bearings
• Massive cast-iron base for vibration damping
• Coolant system, work light, 4-way tool post, and chuck guards

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 Applications

• Heavy manufacturing & metal fabrication
• Shaft and roller turning for industrial equipment
• Maintenance and repair of large components
• Oil & gas industry (pipes, couplers, flanges)
• Prototyping and production runs for cylindrical parts

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Summary Description

The GMC GT-26120 is a robust, heavy-duty precision gap bed lathe designed for machining large and long metal parts with high accuracy. With its 26” swing, 120” centers, 10 HP motor, and SINO digital readout, it provides powerful turning capacity, versatile threading, and tight tolerance control — making it ideal for toolrooms, maintenance shops, and production facilities handling industrial-sized workpieces.

4-Jaw Independent Lathe Chuck

• Description: Heavy-duty 4-jaw independent chuck, likely 12"–16" diameter. Each jaw is adjusted separately for precise centering of irregular or square workpieces.
• Function: Used for holding and rotating workpieces on a metal lathe. Each jaw moves independently, allowing for off-center turning and accurate alignment.
• Applications: Ideal for machining square, rectangular, or irregularly shaped materials that cannot be gripped evenly in a 3-jaw chuck.
• Common Size Range: 10"–18" diameters depending on lathe model.
• Mount Type: Typically D1 or L-type camlock or threaded backplate depending on lathe model (GMC lathes often use D1-6 or D1-8).

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3-Jaw Self-Centering Chuck

• Description: A standard 3-jaw scroll chuck visible in the background — jaws move simultaneously for automatically centering round or hexagonal stock.
• Function: Commonly used for general turning where centering speed is more important than perfect concentric accuracy.
• Applications: Round bars, pipes, and symmetrical parts.
• Size Range: Typically 8"–12".

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Faceplate

• Description: Large round flat plate with radial T-slots or holes for clamping irregular parts directly to the lathe spindle.
• Function: Holds non-cylindrical or oversized workpieces that cannot fit in a chuck.
• Applications: Custom or one-off jobs requiring unusual clamping setups.

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Steady Rest

• Description: The U-shaped metal component with three adjustable brass-tipped fingers.
• Function: Supports long workpieces during turning operations to prevent vibration or deflection.
• Applications: Used when machining shafts, bars, or tubes that extend far from the chuck.

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Follower Rest

• Description: Similar to the steady rest but mounts directly to the lathe carriage and travels with the cutting tool.
• Function: Provides continuous support directly behind the cutting tool to prevent bending on long slender workpieces.

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Change Gears (Lathe Gear Train)

• Description: The visible gear pair (spur gears) used in threading and feed operations.
• Function: Allows the operator to change feed rates or thread pitches by swapping gear combinations.
• Applications: Precision threading and feed control in manual lathes.