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Lees Bradner Thread Milling Machine

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Lees Bradner Thread Milling Machine Specification

Rotation
Manual/Programmable lead rotation

Model
Lees Bradner

Product Type
Thread Milling Machine

General Use
Industrial Thread Milling

Material
Cast Iron, Alloy Steel

Type
Horizontal

Capacity
Up to 36 length, up to 16 diameter

Weight (kg)
Approx. 2500 kg

Computerized
No

Automatic
No

CNC Or Not
Not CNC

Control System
Manual

Table Size
675 mm x 255 mm

Table Slide Way
Box type

Floor Space
1800 mm x 1100 mm approx.

Spindle Speed
Variable, up to 600 RPM

Power
5 HP

Voltage
415 V

Dimension (L*W*H)
1800 mm x 1100 mm x 1500 mm (approx)

Feature
High Precision, Heavy Duty

Color
Green

Min. Thread Diameter
25 mm

Max. Thread Diameter
406 mm (16")

Coolant System
Built-in

Max. Workpiece Length
Up to 914 mm (36")

Spindle Bore
66 mm

Thread Type Capability
External & Internal

Max. Thread Pitch
Up to 12 TPI

Machine Type
Universal Thread Milling

Maintenance
Easy access to lubrication points

Lead Screw Material
Hardened Steel

Surface Finish
Up to 1.5 micron Ra

Main Drive
Mechanical transmission

Gear Change
Quick change gearbox

Working Speed
Variable

Chuck Type
3-Jaw manual chuck

Safety Features
Emergency stop, electrical interlocking

About Lees Bradner Thread Milling Machine

Make - Lees-Bradner (USA)

Model - HT 12x54

Max. Job Diameter - 305 mm (12")

Max. Length of Job - 1372 mm (54")

Spindle Bore - 152 mm (6")

Range of Cutter Head Rotation - 135 degree to -45 Degree

Max. Cutter Diameter - 165 mm (6.5")

Max. Swing Diameter over Bed-Ways - 580 mm (22")

Max. Module - 11.12 module (2.5 CP)

- With Rapid Longitudinal Travel of the Carriage.

- Complete with lots of Cutters, Change Gears, Index Plates etc.

- With lots of other accessories including mandrels etc.

- Machine is in excellent working condition.

Video link - https://youtu.be/JA_BK-UONwA

Versatile Threading Capabilities

Engineered for both internal and external threading, the Lees Bradner Thread Milling Machine accommodates a wide spectrum of thread diameters and pitches. With a minimum thread diameter of 25 mm and a maximum of 406 mm, users can efficiently machine diverse components. Its maximum thread pitch supports up to 12 TPI, making it suitable for heavy-duty threading operations in various industrial sectors.

Precision and Efficiency Combined

Delivering a superior surface finish of up to 1.5 micron Ra, this machine excels in producing high-quality threads. The quick-change gearbox and variable spindle speeds ensure operational flexibility, while the hardened steel lead screw and durable mechanical transmission provide consistent performance. Its heavy-duty cast iron frame minimizes vibrations, enhancing both accuracy and tool life.

Operability and Safety Assured

With a user-friendly manual control system and easily accessible lubrication points, operators benefit from straightforward usage and convenient maintenance. Safety has been prioritized with features like an emergency stop button and electrical interlocking, ensuring secure operation in demanding industrial environments. The built-in coolant system further supports extended machining by preventing overheating.

FAQs of Lees Bradner Thread Milling Machine:

Q: How is the Lees Bradner Thread Milling Machine operated?

A: The Lees Bradner Thread Milling Machine is manually operated, utilizing mechanical transmission and a 3-jaw manual chuck. Thread pitch and spindle speed adjustments are handled through the quick-change gearbox, while lead rotation can be set manually or using programmable options depending on the model.

Q: What types and sizes of threads can this machine produce?

A: This machine is capable of cutting both external and internal threads with diameters ranging from 25 mm to 406 mm (16 inches) and thread pitches up to 12 TPI. Its versatility makes it ideal for producing a broad range of threaded components for industrial uses.

Q: When should maintenance be performed and how easy is it?

A: Routine maintenance can be conveniently carried out thanks to the easy access lubrication points. Regular checks and lubrication as guided in the user manual will help ensure smooth operation and extend the machines lifespan.

Q: Where is the Lees Bradner Thread Milling Machine typically used?

A: It is primarily used in industrial environments such as manufacturing plants, machine shops, and factories that require high-precision and heavy-duty thread milling on medium to large workpieces.

Q: What is the threading process involved with this machine?

A: The threading process starts with securing the workpiece in the 3-jaw manual chuck. The operator selects the desired thread pitch and speed via the quick-change gearbox, then manually controls the milling operation while the built-in coolant system manages heat for optimal results.

Q: What are the main benefits of using this thread milling machine?

A: The Lees Bradner machine offers high-precision threading, robust construction for heavy-duty usage, a wide range of capacities, and ease of maintenance. Its safety features and built-in coolant system further contribute to reliable, efficient operations.

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