GMC 16 speeds, ranging from 25–1,600 RPM GT-26120

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″
Description:
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.





GMC Metal Lathe Tooling and Accessory Lot
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.