NEW SMTCL HTC125 Series Large CNC Horizontal Lathe

SMTCL HTC125 Series Large CNC Horizontal Lathe

The SMTCL HTC125 Series is a large CNC horizontal lathe designed for rough and finish turning of large shafts, rolls, cylinders, discs and other heavy engineering components.

Unlike the smaller slant-bed HTC30–80 platforms, the HTC125 belongs to SMTCL’s large horizontal CNC lathe range and is designed around large workpiece capacity, high spindle torque, long turning lengths and heavy-duty support.

The HTC125 Series is particularly suitable for rolling stock, metallurgy, paper manufacturing, electric power, energy, wind-power and heavy engineering applications.

It can perform rough and finish turning of cast iron, steel and non-ferrous workpieces, including external cylindrical surfaces, internal bores, threads, end faces, grooves, curved profiles, tapers and other rotational features.

With a maximum turning diameter of 1250 mm, turning lengths from 1500 to 8000 mm, maximum spindle torque of 7500 Nm and standard shaft workpiece capacity of 5000 kg, the HTC125 provides a substantial heavy-turning platform for large industrial components.


HTC125 Series Model Range

The HTC125 Series is available in five principal turning-length configurations:

• HTC125150 – 1500 mm maximum cutting length

• HTC125300 – 3000 mm maximum cutting length

• HTC125500 – 5000 mm maximum cutting length

• HTC125600 – 6000 mm maximum cutting length

• HTC125800 – 8000 mm maximum cutting length

The correct bed length should be selected according to the actual workpiece length, tailstock support requirements, steady-rest arrangement and machining process.


Key Series Specifications

• Maximum swing over machine body: 1250 mm

• Maximum cutting diameter: 1250 mm

• Maximum swing over slide: 850 mm

• Maximum cutting length: 1500 / 3000 / 5000 / 6000 / 8000 mm

• Effective workpiece clamping / centre distance:
1600 / 3100 / 5100 / 6100 / 8100 mm

• Spindle nose: A2-15

• Spindle front taper: Metric 140

• Spindle bore: 130 mm

• Hydraulic speed-change headstock: Yes

• Spindle speed range: 5–500 rpm

• Maximum spindle output torque: 7500 Nm

• Main motor output: 22 kW

• Standard chuck: Ø1000 mm manual four-jaw chuck

• X-axis rapid traverse: 6 m/min

• Z-axis rapid traverse: 5 m/min

• X-axis travel: 650 mm

• Z-axis travel:
1500 / 3000 / 5000 / 6000 / 8000 mm depending on model

• Mechanical tailstock: Standard

• Tailstock sleeve diameter: 160 mm

• Tailstock sleeve travel: 300 mm

• Tailstock sleeve taper: Morse 6

• Tool carriage: Vertical four-station

• Tool size: 40 × 40 mm

• Maximum disc workpiece capacity: 1000 kg

• Maximum shaft workpiece capacity: 5000 kg standard

• Optional shaft workpiece capacity: up to 8000 kg configuration

• Centre height above machine body: approximately 625 mm

• Centre height above floor: approximately 1275 mm


Model Dimensions

HTC125150

• Maximum cutting length: 1500 mm

• Overall dimensions: approximately 5000 × 2725 × 2450 mm


HTC125300

• Maximum cutting length: 3000 mm

• Overall dimensions: approximately 6500 × 2725 × 2450 mm


HTC125500

• Maximum cutting length: 5000 mm

• Overall dimensions: approximately 8500 × 2725 × 2450 mm


HTC125600

• Maximum cutting length: 6000 mm

• Overall dimensions: approximately 9850 × 2725 × 2450 mm


HTC125800

• Maximum cutting length: 8000 mm

• Overall dimensions: approximately 11850 × 2725 × 2450 mm


Large CNC Horizontal Lathe Platform

The HTC125 is designed as a heavy horizontal CNC lathe rather than a high-speed production turning centre.

Its design priorities include:

• High rigidity

• High structural strength

• High workpiece load capacity

• High spindle torque

• High machining stability

• Long workpiece capability

• Heavy roughing and finishing

This makes it particularly suitable for large industrial components where rigidity and workpiece support are more important than very high rapid traverse or compact machine footprint.


Hydraulic Multi-Speed Headstock

The HTC125 uses a hydraulically shifted headstock with stepless speed control within each gear range.

The spindle speed range is:

• 5–500 rpm

Maximum spindle output torque is:

• 7500 Nm

This low-speed, high-torque spindle arrangement is designed for:

• Large-diameter steel components

• Cast iron rolls

• Heavy shafts

• Large cylinders

• Large flanges

• Thick-wall components

• Heavy rough turning

• High cutting-force applications


A2-15 Heavy Spindle Platform

The HTC125 uses an A2-15 spindle nose and 130 mm spindle bore.

This provides a substantially heavier spindle interface than smaller HTC slant-bed machines.

The large spindle structure is appropriate for:

• Large four-jaw chucks

• Heavy workpieces

• High cutting loads

• Large-diameter components

• Long shaft work

• High-torque roughing


Ø1000 mm Manual Four-Jaw Chuck

The standard HTC125 configuration includes a:

• Ø1000 mm manual four-jaw chuck

A four-jaw chuck is particularly useful for large heavy workpieces where:

• Strong independent clamping is required

• Workpiece geometry is not perfectly round

• Large castings or forgings must be centred manually

• High clamping force is required

• Workpiece setup flexibility is important

Other three-jaw and four-jaw chuck sizes are available as options depending on the application.


Heavy Workpiece Capacity

The standard HTC125 configuration provides:

• Disc workpiece capacity: 1000 kg

• Shaft workpiece capacity: 5000 kg

An optional configuration is available for:

• Shaft workpiece capacity up to 8000 kg

This makes the HTC125 suitable for heavy rolls, rotors, cylinders and long shafts requiring substantial support.


Long Workpiece Capability

The HTC125 Series provides turning lengths from 1500 mm to 8000 mm.

This broad range allows the machine to be selected for:

• Medium-length heavy shafts

• Long rolls

• Large hydraulic cylinders

• Generator and motor components

• Paper-making rolls

• Metallurgical rolls

• Long energy-sector components

• Large rotating equipment components

Selecting the correct bed length is important because unnecessary bed length increases machine footprint, installation requirements and capital cost.


Mechanical Tailstock

The standard HTC125 uses a mechanical tailstock with:

• 160 mm sleeve diameter

• 300 mm sleeve travel

• Morse 6 taper

The large tailstock provides additional support for long and heavy shaft components.

This is especially important for:

• Long shafts

• Rolls

• Rotors

• Hydraulic cylinders

• Components requiring centre support during heavy roughing

Electric tailstock options are also listed in the manufacturer’s available configuration.


Vertical Four-Station Tool Carriage

The standard HTC125 configuration uses a vertical four-station electric tool carriage.

• Tool capacity: 4 stations

• Tool size: 40 × 40 mm

The turret arrangement is intentionally simple and robust for heavy turning applications.

It is suitable for:

• External turning tools

• Boring tools

• Grooving tools

• Threading tools

• Heavy roughing tools

Different electric tool-carriage configurations are available depending on the machining requirement.


Machining Accuracy

The HTC125 catalogue specifies machining accuracy in the IT6–IT7 range under stated test conditions.

Representative catalogue values include:

• Workpiece roundness: approximately 0.005 mm

• Diameter consistency: approximately 0.025 mm / 300 mm

• Workpiece flatness: approximately 0.02 mm / Ø300 mm

• External cylindrical surface roughness: Ra1.6 ?m

• Arc and tapered surface roughness: Ra3.2 ?m

These figures represent manufacturer test conditions and should not be treated as guaranteed finished-part capability for every workpiece, setup or machining process.


Positioning Accuracy

X-axis positioning accuracy:

• Approximately 0.014 mm


Z-axis positioning accuracy depends on machine length:

• HTC125150: approximately 0.024 mm

• HTC125300: approximately 0.032 mm

• HTC125500: approximately 0.05 mm

• HTC125600: approximately 0.05 mm with standard Z-axis grating scale

• HTC125800: approximately 0.065 mm with standard Z-axis grating scale


Repeat Positioning Accuracy

X-axis:

• Approximately 0.006 mm


Z-axis:

• Approximately 0.012–0.016 mm depending on machine length

For long-bed machines, linear-scale configuration is particularly important to controlling accumulated positioning error over long Z-axis travel.


High Rigidity and Stability

The HTC125 Series is designed around the requirements of heavy turning.

The manufacturer positions the HTC125/160/200 family around:

• High rigidity

• High strength

• High load capacity

• High accuracy

• High efficiency

• High stability

These characteristics are particularly important when machining large workpieces where cutting force, workpiece weight and thermal influence are much greater than on conventional production lathes.


Typical Industries

The HTC125 Series is intended for demanding industrial sectors including:

• Rolling stock

• Metallurgy

• Paper manufacturing

• Electric power

• Power generation

• Wind power

• Heavy engineering

• Large machinery manufacturing

• National key industrial applications

• Energy-sector manufacturing


Typical Applications

The HTC125 can perform:

• External cylindrical turning

• Internal boring

• Face turning

• Grooving

• Threading

• Taper turning

• Curved-profile machining

• Rough turning

• Finish turning

• Multi-process machining in one setup when configured with appropriate accessories


Typical Workpieces

Typical HTC125 workpieces may include:

• Large motor rotors

• Generator rotors

• Turbine-related components

• Large hydraulic cylinder bodies

• Rolls

• Paper-making rolls

• Metallurgical rolls

• Large shafts

• Large sleeves

• Large flanges

• Heavy valve components

• Large rotating machinery components

• Heavy industrial cylinders

• Energy-sector components


Documented Industry Applications

The current SMTCL turning product material identifies HTC125/160/200 applications including:

• Large motor rotors

• Large hydraulic cylinder bodies

• Steam turbine rotors

• Generator rotors

• Large drums

These examples demonstrate the large-workpiece and heavy-industry focus of the HTC125 platform.


Why Consider the HTC125 Series?

The HTC125 Series is particularly attractive where the customer requires large turning diameter, long bed length and heavy workpiece capacity without moving into the substantially larger HTC160 or HTC200 platforms.

Key advantages include:

• 1250 mm maximum swing over machine body

• 1250 mm maximum cutting diameter

• Up to 8000 mm maximum cutting length

• A2-15 spindle interface

• 130 mm spindle bore

• 5–500 rpm spindle speed range

• Up to 7500 Nm spindle torque

• 22 kW main motor

• Ø1000 mm manual four-jaw chuck

• 5000 kg standard shaft workpiece capacity

• Optional 8000 kg shaft capacity

• Large mechanical tailstock

• Long-bed configurations

• Suitable for rough and finish turning

• Suitable for large steel, cast iron and non-ferrous components

• Suitable for heavy engineering and energy industries


HTC125 Length Selection Guide

HTC125150

• Maximum cutting length: 1500 mm

Best suited for:

• Large-diameter short shafts

• Large discs

• Flanges

• Short rolls

• Heavy chucking components


HTC125300

• Maximum cutting length: 3000 mm

Best suited for:

• Medium-length shafts

• Hydraulic cylinders

• Short industrial rolls

• Generator and motor components


HTC125500

• Maximum cutting length: 5000 mm

Best suited for:

• Long shafts

• Rolls

• Large cylinders

• Energy-sector components

• Heavy industrial rotors


HTC125600

• Maximum cutting length: 6000 mm

Best suited for:

• Long rolls

• Large power-generation components

• Long cylinders

• Large industrial shafts


HTC125800

• Maximum cutting length: 8000 mm

Best suited for:

• Very long industrial shafts

• Long paper and metallurgical rolls

• Energy-sector components

• Heavy rotating equipment

• Applications requiring maximum HTC125 bed length


HTC125 Compared with HTC80

The HTC125 is not simply a larger HTC80.

The two machines belong to different product concepts.


HTC80

The HTC80 is a heavy-duty slant-bed turning centre.

It is suited to:

• Large production shafts

• Disc components

• Higher-speed production turning

• More compact heavy-duty machining

• Automated production applications


HTC125

The HTC125 is a large horizontal CNC lathe.

It is designed around:

• Much larger turning diameter

• Long workpiece capacity

• Large four-jaw chucking

• Low-speed high-torque turning

• Heavy shaft support

• Rolls, rotors and large industrial components

Choose HTC80 when productivity and slant-bed turning-centre characteristics are more important.

Choose HTC125 when workpiece size, length, weight and heavy-duty support are the main priorities.


HTC125 / HTC160 / HTC200 Selection Guide

The large horizontal HTC family includes:

• HTC125

• HTC160

• HTC200


HTC125

Positioning:

• Large CNC horizontal lathe

• Standard shaft workpiece capacity: 5 tonnes

• Optional shaft capacity: 8 tonnes

• Maximum cutting diameter: 1250 mm

• Main motor: 22 kW

• Maximum spindle torque: 7500 Nm

Best suited for:

• Large shafts

• Rolls

• Hydraulic cylinders

• Rotors

• Large industrial components


HTC160

Positioning:

• Larger heavy-duty CNC horizontal lathe

• Standard shaft workpiece capacity: 10 tonnes

• Optional 18-tonne configuration

• Maximum cutting diameter: 1600 mm

• Main motor: 37 kW

• Maximum spindle torque: 15,000 Nm

Best suited for:

• Very large shafts

• Larger rolls

• Generator and turbine components

• Heavy rotating components


HTC200

The HTC200 extends the same large-horizontal-lathe platform into still greater diameter and load capacity.

It should be considered where the workpiece exceeds the practical diameter or mass range of HTC125 and HTC160.

Final HTC200 specification should be confirmed against the actual workpiece before quotation.


Standard Configuration

The HTC125 catalogue lists the following typical standard equipment:

• Siemens 828D CNC system

• Domestic 22 kW variable-frequency main motor

• Imported high-accuracy spindle bearings

• Manual tailstock

• Vertical four-station electric tool carriage

• Imported-brand leadscrew

• Ø1000 mm manual four-jaw chuck

• Two-axis automatic lubrication

• Cooling system

• Foundation pads according to anchor-hole arrangement

Semi-closed guarding is listed as standard on:

• HTC125150

• HTC125300

• HTC125500


Optional Configuration

Available HTC125 options listed by the manufacturer include:

• FANUC CNC system

• Matching axis motors with FANUC system

• Siemens or FANUC main motor

• Other three-jaw or four-jaw chuck sizes

• Heidenhain linear scales

• Fagor linear scales

• 8-tonne shaft workpiece configuration

• Various steady-rest sizes

• Roller support systems

• Alternative electric tool carriages

• Semi-closed guarding where not standard

• Chain-type chip conveyor

• Various boring-bar holders

• Small-spindle tailstock

• Electric tailstock


Workholding and Support Planning

For a machine in the HTC125 class, selecting the lathe alone is not enough.

The complete machining system should consider:

• Chuck type and diameter

• Workpiece weight

• Workpiece centre of gravity

• Tailstock support

• Number and size of steady rests

• Roller supports

• Boring-bar requirements

• Lifting equipment

• Workpiece handling

• Chip removal

• Coolant management

• Foundation design

• Machine access

• Installation space

• Electrical supply

• Operator access

These requirements should be reviewed against the actual workpiece before final quotation.


Not the Best Fit When

The HTC125 may not be the best choice when:

• Most workpieces are small enough for HTC63 or HTC80

• High-speed production turning is the main priority

• Automatic bar feeding is required

• Compact machine footprint is important

• Live tooling or milling is required

• Y-axis machining is required

• Sub-spindle machining is required

• Full turn-mill machining is required

• Workpiece mass or diameter exceeds HTC125 capacity

For these applications, an HTC63, HTC80, HTC160, HTC200 or HTM turn-mill solution may be more appropriate.


Machine Selection and Configuration

Final HTC125 configuration should be selected according to the actual workpiece and machining process.

Please provide:

• Maximum workpiece diameter

• Maximum workpiece length

• Maximum workpiece weight

• Workpiece material

• Drawing where available

• Required roughing allowance

• Required machining operations

• Required tolerances

• Surface finish requirements

• Chuck requirement

• Tailstock requirement

• Steady-rest requirements

• Boring-bar requirements

• Tool-carriage requirements

• Linear-scale requirements

• Chip conveyor requirement

• Workpiece loading method

• Crane capacity

• Foundation and installation information

• Preferred CNC control

• Voltage and site requirements

MachineryPLUS can assist with selecting the correct HTC125 bed length, workholding arrangement, support system, tooling and installation package according to the actual component.


Complete Your Machine Setup

A large CNC lathe is only one part of the complete heavy-turning system.

MachineryPLUS can also assist with:

• CNC machine selection

• Heavy-duty turning tools

• Boring bars

• Parting and grooving tools

• Threading tools

• Drilling tools

• Tool holders

• Large chucking solutions

• Soft and hard jaws

• Centres

• Tailstock tooling

• Steady rests

• Roller supports

• Special workholding

• Tool measurement

• Chip management

• Workpiece handling

• Automation

• Integrated manufacturing solutions

This allows the machine, tooling, workholding, material handling and production process to be considered as one complete manufacturing solution.


Explore More from MachineryPLUS

MachineryPLUS supplies machine tools, manufacturing solutions, cutting tools, workholding and supporting equipment for Australian manufacturing, machining and engineering businesses.

Our broader machine tool and manufacturing solution range includes:

• CNC Turning – CNC lathes, horizontal turning centres, vertical lathes, heavy-duty lathes and turn-mill machining centres.

• Machining Centres – vertical machining centres, horizontal machining centres, five-axis machining centres and drilling and tapping centres.

• Five-Axis Machining – vertical five-axis machining centres, horizontal five-axis machining centres, five-axis gantry machines and specialised five-axis machining solutions.

• Large Machining – gantry machining centres, floor-type boring and milling machines, table-type boring and milling machines and large heavy-duty machine tools.

• Precision & Specialised Machines – grinding machines, gear manufacturing machines, ultra-precision equipment and special-purpose machine tools.

• Forming & Forging Equipment – hydraulic presses, mechanical presses, forging systems, forming equipment and specialised production systems.

• Automation & Smart Manufacturing – robotic automation, gantry automation, flexible manufacturing systems, machining cells, automated production lines and digital manufacturing solutions.

• Cutting Tools – turning, milling, drilling, threading and holemaking tools for a broad range of machining applications.

• Tool Holders – BT, CAT, HSK, PSC/Capto, Morse taper, R8 and other machine tool holder systems.

• Workholding – machine vises, chucking solutions, soft jaws, centres, fixtures and CNC workholding accessories.

• Machine Tool Accessories – collets, drill chucks, pull studs, tapping systems, milling and lathe accessories and supporting workshop equipment.

• Tool Management & Storage – tooling storage, organisation and workshop solutions designed to improve productivity and tool control.

MachineryPLUS can support customers from individual machine selection through to tooling, workholding, automation and integrated manufacturing solutions.

Based in Perth, Western Australia, MachineryPLUS supports customers locally and Australia-wide with product selection, sourcing and practical manufacturing solutions.

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