NEW SMTCL STC34s Series CNC Pipe Thread Lathe

NEW SMTCL STC34s Series CNC Pipe Thread Lathe

The SMTCL STC34s Series is an economical CNC pipe thread lathe designed for large petroleum pipe, casing and other tubular components requiring a combination of large spindle through-bore capacity and longer longitudinal machining capability.

Unlike the short-cycle S34 high-efficiency pipe-thread platform, the STC34s uses a conventional long-bed CNC lathe configuration with available cutting lengths of 1500 mm and 3000 mm.

This makes the STC34s particularly suitable where customers require both:

• Large-diameter pipe-thread machining

and

• Longer conventional turning capability


Typical applications include:

• Petroleum pipe

• Oilfield casing

• Large tubular components

• Pipe couplings

• Threaded tubular connections

• Pipe-end machining

• Longitudinal turning

• Internal and external threading

• Oilfield repair and reconditioning


STC34s Series Positioning

The STC34s is positioned as an economical and practical CNC pipe thread lathe for large petroleum pipe and casing machining.

Its main strengths are:

• Large spindle through-hole

• Large through-bore cutting diameter

• Long 1500 / 3000 mm cutting lengths

• Practical conventional CNC lathe architecture

• Large petroleum tubular capacity

• General turning capability in addition to pipe threading

The STC34s is therefore a useful choice where a dedicated short-cycle pipe-end machine would be too specialised.


Key Specifications

• Maximum rotary diameter: 1250 mm

• Maximum cutting length:
1500 mm / 3000 mm

• Maximum spindle through-hole cutting diameter:
340 mm

• Petroleum product range:
5 1/2 in – 13 3/8 in

• Maximum spindle speed:
350 rpm

• Spindle motor:
22 / 30 kW for 1500 mm configuration

• Spindle motor:
30 / 37 kW for 3000 mm configuration

• Spindle through-hole:
355 mm

• X-axis travel:
650 mm

• Z-axis travel:
1500 mm or 3000 mm depending on machine length

• Standard turret:
Vertical 4-station

• Tool section:
40 × 40 mm

Final CNC system and options should be confirmed at quotation stage.


Two Main Machine-Length Configurations

The current STC34s specification identifies two principal cutting-length options.


1500 mm Cutting Length

Typical spindle motor:

• 22 / 30 kW

Best suited where:

• Pipe-end machining is important

• Moderate longitudinal turning is required

• A shorter machine footprint is preferred

• 1500 mm working length is sufficient


3000 mm Cutting Length

Typical spindle motor:

• 30 / 37 kW

Best suited where:

• Longer tubular sections require machining

• Greater longitudinal turning capability is needed

• Longer workpieces are common

• Increased spindle motor capacity is beneficial


Large 355 mm Spindle Through-Hole

One of the most important features of the STC34s is its:

• 355 mm spindle through-hole

This supports large tubular workpieces and allows long pipe or casing to pass through the spindle.

The machine provides:

• Up to 340 mm maximum through-hole cutting diameter

This is particularly useful for:

• Large petroleum casing

• Large pipe

• Oilfield tubular products

• Pipe couplings

• Threaded connections


Petroleum Product Range

The current supplier-confirmed range is:

• 5 1/2 in – 13 3/8 in

This places the STC34s in the large petroleum tubular category.

The exact thread specification and workpiece compatibility should be confirmed from the actual customer drawing and product standard.


350 rpm Maximum Spindle Speed

The maximum spindle speed is:

• 350 rpm

This relatively low speed is appropriate for:

• Large-diameter tubular components

• Thread cutting

• Heavy pipe-end turning

• Large spindle-bore work

• Long workpieces


The STC34s should therefore be evaluated on:

• Bore capacity

• Workpiece size

• Cutting length

• Threading capability

rather than on maximum spindle speed alone.


Large Long-Bed Machining Capacity

The STC34s provides:

• X-axis travel: 650 mm

• Z-axis travel: 1500 mm or 3000 mm

This is one of its most important differences from the S34 high-efficiency platform.

The longer Z-axis allows the machine to support:

• Longitudinal turning

• Longer external diameters

• Internal machining over greater length

• Extended pipe-end preparation

• Threading

• Grooving

• Facing

• General tubular machining


Standard Vertical 4-Station Turret

The current machine specification identifies:

• Vertical 4-station turret

• 40 × 40 mm tool section

This provides a conventional and practical tooling arrangement suitable for:

• External turning

• Internal turning

• Threading

• Grooving

• Facing


The 4-station layout also supports straightforward operation and maintenance for general pipe-thread machining.


Typical Machining Operations

The STC34s can support:

• External turning

• Internal turning

• Facing

• External threading

• Internal threading

• Grooving

• Thread relief machining

• Pipe-end preparation

• Longitudinal turning

• Large tubular component machining


Typical Industries

The STC34s is particularly suited to:

• Oil and gas

• Petroleum tubular manufacturing

• Casing production

• Pipe processing

• Oilfield equipment

• Tubular component production

• Repair and reconditioning operations

• General heavy engineering involving large tubular workpieces


Typical Workpieces

Typical STC34s workpieces may include:

• Petroleum casing

• Large petroleum pipe

• Pipe couplings

• Tubular connections

• Oilfield tubular components

• Large hollow shafts

• Threaded pipe ends

• Long cylindrical components


Why Consider the STC34s?

The STC34s is a strong choice where customers need large pipe-thread capacity combined with longer conventional turning capability.

Key reasons to consider the STC34s include:

• 1250 mm maximum rotary diameter

• 1500 / 3000 mm cutting-length options

• 355 mm spindle through-hole

• 340 mm maximum through-hole cutting diameter

• Petroleum product range up to 13 3/8 in

• 350 rpm maximum spindle speed

• 22 / 30 kW spindle motor on 1500 mm machine

• 30 / 37 kW spindle motor on 3000 mm machine

• 650 mm X-axis travel

• 1500 / 3000 mm Z-axis travel

• Vertical 4-station turret

• 40 × 40 mm tool section

• Large-bore long-bed CNC lathe architecture

• Practical combination of threading and longitudinal turning


STC34s Compared with S34

Although both machines cover large petroleum tubular products, their machine concepts are fundamentally different.


STC34s

Positioning:

• Economical / practical CNC pipe thread lathe

Key characteristics:

• Maximum rotary diameter: 1250 mm

• Cutting length: 1500 / 3000 mm

• Spindle through-hole: 355 mm

• Through-hole cutting diameter: 340 mm

• Petroleum product range: 5 1/2 in – 13 3/8 in

• Maximum spindle speed: 350 rpm

• Vertical 4-station turret


Best suited where:

• Longer longitudinal machining is required

• Large tubular components are common

• General turning capability is useful

• A conventional long-bed architecture is preferred

• Overall practicality and value are important


S34

Positioning:

• High-efficiency, high-accuracy dedicated pipe-thread CNC machine

Typical characteristics:

• Maximum body swing: 850 mm

• Cutting length: 200 mm

• Spindle bore: 300 / 365 mm

• Cutting diameter: 280 / 340 mm

• Petroleum range up to 13 3/8 in

• Main motor: 30 / 37 kW

• Short-cycle production layout


Best suited where:

• Machining is concentrated at the pipe end

• High production efficiency is important

• Repeated pipe-thread work dominates

• Longitudinal turning length is not required


In simple terms:

STC34s = long-bed practical pipe-thread lathe

S34 = short-cycle high-efficiency pipe-thread production machine


STC34s Compared with STC22s

STC22s

• Maximum rotary diameter: 1250 mm

• Cutting length: 1500 / 3000 mm

• Maximum through-hole cutting diameter: 220 mm

• Petroleum product range:
4 1/2 in – 8 5/8 in

• Maximum spindle speed: 450 rpm

• Spindle through-hole: 240 mm

• X/Z travel:
650 / 1500 or 3000 mm

• Standard turret:
Vertical 4-station, 40 × 40 mm


STC34s

• Maximum rotary diameter: 1250 mm

• Cutting length: 1500 / 3000 mm

• Maximum through-hole cutting diameter: 340 mm

• Petroleum product range:
5 1/2 in – 13 3/8 in

• Maximum spindle speed: 350 rpm

• Spindle through-hole: 355 mm

• X/Z travel:
650 / 1500 or 3000 mm

• Standard turret:
Vertical 4-station, 40 × 40 mm


The two machines share a very similar long-bed concept.

The main reason to move from STC22s to STC34s is larger tubular capacity.

Choose STC22s where:

• 240 mm spindle bore is sufficient

• Product range remains within approximately 8 5/8 in

• Smaller pipe sizes dominate


Choose STC34s where:

• 355 mm through-bore is required

• Product size extends toward 13 3/8 in

• Larger casing and tubular components are common


STC Series Selection Guide

STC22s

Best suited for:

• Medium-size petroleum pipe

• Medium casing

• Longitudinal turning

• Up to approximately 8 5/8 in product range


STC34s

Best suited for:

• Large petroleum pipe

• Large casing

• Large tubular products

• Longitudinal turning

• Up to approximately 13 3/8 in product range


The correct STC model should therefore be selected primarily according to:

• Pipe outside diameter

• Required spindle through-hole

• Thread size

• Required cutting length

• Workpiece weight

• Material

• Production requirement


STC Series vs S Series

These two SMTCL pipe-thread families should not be treated as simple model-size alternatives.


STC Series

Focus:

• Economical and practical

• Long-bed CNC lathe architecture

• Longer longitudinal turning

• Pipe threading plus broader turning capability


S Series

Focus:

• High efficiency

• High accuracy

• Dedicated short-cycle pipe-end machining

• Production-oriented petroleum threading


Choose STC where:

• Longer workpiece machining is required

• General turning capability matters

• A conventional lathe layout is preferred


Choose S Series where:

• Thread production dominates

• Machining is concentrated at the pipe end

• Short cycle time and repeatability are priorities


Machine Selection and Configuration

The correct STC34s configuration should be selected according to the actual tubular component.

Please provide:

• Pipe outside diameter

• Pipe inside diameter

• Product type

• Casing / pipe / tubular component type

• Thread standard

• Thread form

• Thread size

• Thread pitch

• Internal or external thread

• Workpiece material

• Required machining length

• Maximum workpiece length

• Maximum workpiece weight

• Required tolerance

• Production quantity

• Workholding requirement

• Tooling requirement

• CNC control preference

• Coolant requirement

• Chip-management requirement

• Workshop power supply

• Delivery location

MachineryPLUS can assist with selecting the correct STC34s machine length, tooling and configuration according to the actual workpiece.


Configuration Before Quotation

The following should be confirmed before final quotation:

• 1500 mm or 3000 mm cutting length

• Maximum pipe diameter

• Required spindle through-bore

• Thread standard

• CNC system

• Workholding / clamping system

• Turret configuration

• Threading-tool package

• Coolant system

• Chip-removal system

• Steady-rest requirement

• Pipe-support requirement

• Foundation

• Installation requirements

• Electrical requirements

Final machine specifications and options should be confirmed before quotation.


Complete Your Pipe Thread Machining Setup

MachineryPLUS can also assist with:

• CNC pipe thread lathe selection

• External threading tools

• Internal threading tools

• Turning tools

• Grooving tools

• Boring bars

• Thread inserts

• Tool holders

• Pipe-support solutions

• Workholding

• Measuring equipment

• Coolant solutions

• Chip management

• Tool storage

• Production setup advice


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