NEW SMTCL S22 Series High-Efficiency CNC Pipe Thread Lathe

NEW SMTCL S22 Series High-Efficiency CNC Pipe Thread Lathe

The SMTCL S22 Series is a high-efficiency, high-accuracy CNC pipe thread lathe designed specifically for petroleum pipe, casing and drill-pipe thread machining.

Positioned between the smaller S18 and larger S34, the S22 provides a practical medium-capacity platform for oilfield tubular products requiring a large spindle through-bore, short-cycle pipe-end machining and repeatable thread accuracy.

The S22 is particularly suited to:

• Petroleum pipe

• Oilfield casing

• Drill pipe

• Drill-pipe connections

• Drill collars

• Pipe couplings

• Threaded tubular components

• Petroleum tubular production and repair


S22 Series Positioning

The S Series is designed as a dedicated high-efficiency and high-accuracy pipe-thread CNC machining platform.

Its key priorities include:

• High machining efficiency

• High accuracy

• High rigidity

• High accuracy retention

• Large through-spindle capacity

• Dedicated petroleum-thread machining

• Short-cycle pipe-end production


Unlike a conventional general-purpose CNC lathe, the S22 is specifically configured around tubular workpieces that pass through the spindle while machining is concentrated at the pipe end.


S22 Key Specifications

• Maximum body swing: Ø720 mm

• Maximum cutting length: 200 mm

• Maximum cutting diameter:
Ø220 mm / Ø245 mm depending on configuration

• Petroleum product range:
5 1/2 in – 8 5/8 in
or
5 1/2 in – 9 5/8 in

• Spindle speed range:
200–600 rpm
or
200–550 rpm depending on configuration

• Main spindle motor:
22 / 30 kW servo

• Spindle bore:
Ø240 mm / Ø260 mm depending on configuration

• X-axis rapid traverse: 10 m/min

• Z-axis rapid traverse: 12 m/min

• X-axis travel: 350 mm

• Z-axis travel: 650 mm

• Machining accuracy: IT6

• Standard tool carriage:
32 × 32 mm row tool

• Optional tool carriage:
Vertical 6-station servo turret
Horizontal 8-station servo turret


Two Main Capacity Configurations

The manufacturer identifies two principal S22 capacity combinations.


240 mm Spindle Bore Configuration

Typical capability:

• Maximum cutting diameter: Ø220 mm

• Spindle bore: Ø240 mm

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

• Spindle speed:
approximately 200–600 rpm


This configuration is suited to:

• Medium petroleum pipe

• Oilfield casing

• Drill-pipe connections

• Applications where a 240 mm through-bore is sufficient


260 mm Spindle Bore Configuration

Typical capability:

• Maximum cutting diameter: Ø245 mm

• Spindle bore: Ø260 mm

• Petroleum product range:
5 1/2 in – 9 5/8 in

• Spindle speed:
approximately 200–550 rpm


This configuration is better suited where:

• Larger casing is common

• Greater spindle clearance is required

• Pipe size approaches the upper end of the S22 range


High-Efficiency Pipe-End Machining

The S22 uses a short:

• 200 mm maximum cutting length

This is intentional.

The machine is designed for operations concentrated around the end of a tubular component rather than long-distance longitudinal turning.

Typical operations include:

• Pipe-end facing

• External thread machining

• Internal thread machining

• Thread relief machining

• Grooving

• Internal turning

• External turning

• End preparation

• Connection machining


This specialised architecture can reduce unnecessary axis movement and improve productivity in repeated pipe-thread production.


Large Spindle Through-Bore

A major feature of the S22 is its large spindle bore.

Available spindle through-hole diameters are:

• Ø240 mm

• Ø260 mm


This allows long tubular workpieces to pass through the spindle while only the pipe end is positioned in the machining zone.

The large through-bore is especially important for:

• Casing

• Petroleum pipe

• Drill pipe

• Tubular connections

• Oilfield components


22 / 30 kW Servo Main Spindle

The S22 uses a:

• 22 / 30 kW main servo motor

This provides the power required for:

• Thread cutting

• Pipe-end turning

• Internal and external machining

• Grooving

• Facing

• Repeated production cycles


Spindle Speed Range

Depending on spindle-bore configuration, the S22 provides approximately:

• 200–600 rpm

or

• 200–550 rpm


The relatively low spindle-speed range reflects the machine’s intended purpose:

• Larger tubular diameters

• High-load thread cutting

• Large through-bore machining

• Oilfield pipe-end production


The S22 should therefore not be compared with a general-purpose high-speed CNC lathe simply by maximum rpm.


Axis Performance

The S22 provides:

• X-axis travel: 350 mm

• Z-axis travel: 650 mm

• X-axis rapid traverse: 10 m/min

• Z-axis rapid traverse: 12 m/min


This axis arrangement supports efficient:

• Tool approach

• Thread cutting

• Facing

• Grooving

• Internal turning

• External turning

• Pipe-end preparation


IT6 Machining Accuracy

The manufacturer specifies:

• Machining accuracy: IT6

The Series is designed around high accuracy and high accuracy retention for repeated petroleum-thread production.

Final workpiece accuracy still depends on:

• Thread type

• Workpiece material

• Tooling

• Workholding

• Cutting parameters

• Setup

• Inspection method


API Petroleum Thread Capability

The manufacturer states that the S Series can machine thread forms including:

• API 5B long round thread

• API 5B short round thread

• API 5CT-related petroleum casing thread applications

• Buttress thread

• Special thread forms complying with American Petroleum Institute requirements


Final thread capability should always be confirmed against:

• Exact API specification

• Thread size

• Thread profile

• Pipe material

• Required tolerance

• Customer drawing


Standard Row-Tool Arrangement

The standard S22 tool carriage is:

• 32 × 32 mm row tool

The row-tool arrangement provides a simple and rigid production setup for tools such as:

• External turning tools

• Internal turning tools

• External threading tools

• Internal threading tools

• Grooving tools

• Facing tools


Optional Servo Turrets

The manufacturer also lists:

• Vertical 6-station servo turret

• Horizontal 8-station servo turret


These configurations may be useful where:

• More tools are required

• Multiple machining processes are combined

• Automatic tool selection is important

• Greater process flexibility is needed


Typical Machining Operations

The S22 can support:

• External turning

• Internal turning

• Facing

• External threading

• Internal threading

• Grooving

• Thread relief machining

• Pipe-end preparation

• Casing thread machining

• Drill-pipe connection machining


Typical Industries

The S22 is primarily suited to:

• Oil and gas

• Petroleum tubular manufacturing

• Oilfield equipment

• Casing production

• Drill-pipe manufacturing

• Tubular component production

• Oilfield repair and reconditioning


Typical Workpieces

Typical applications may include:

• Petroleum pipe

• Oilfield casing

• Drill pipe

• Pipe couplings

• Threaded tubular connections

• Drill-pipe joints

• Drill collars

• Petroleum tubular accessories


Why Consider the S22 Series?

The S22 is particularly attractive where the customer requires more capacity than S18 but does not need the much larger S34 platform.

Key reasons to consider the S22 include:

• Ø720 mm maximum body swing

• 200 mm production-oriented cutting length

• Up to Ø245 mm cutting diameter

• Up to Ø260 mm spindle bore

• Petroleum product range up to approximately 9 5/8 in

• 22 / 30 kW servo main spindle

• 200–600 / 200–550 rpm spindle range

• X/Z travel of 350 / 650 mm

• X/Z rapid traverse of 10 / 12 m/min

• IT6 machining accuracy

• 32 × 32 mm standard row-tool system

• Optional vertical 6-station servo turret

• Optional horizontal 8-station servo turret

• API petroleum thread capability

• High-efficiency pipe-end machining concept


S22 Compared with S18

S18

• Maximum body swing: Ø650 mm

• Maximum cutting length: 200 mm

• Maximum cutting diameter:
Ø140 / Ø180 mm

• Petroleum range:
2 3/8 in – 5 1/2 in
or
2 3/8 in – 7 in

• Spindle bore:
Ø160 / Ø200 mm

• Spindle speed:
200–750 / 200–670 rpm

• Main motor:
22 / 30 kW

• X/Z travel:
350 / 650 mm


S22

• Maximum body swing: Ø720 mm

• Maximum cutting length: 200 mm

• Maximum cutting diameter:
Ø220 / Ø245 mm

• Petroleum range:
5 1/2 in – 8 5/8 in
or
5 1/2 in – 9 5/8 in

• Spindle bore:
Ø240 / Ø260 mm

• Spindle speed:
200–600 / 200–550 rpm

• Main motor:
22 / 30 kW

• X/Z travel:
350 / 650 mm


The main reason to move from S18 to S22 is therefore workpiece diameter and spindle through-bore capacity.

Choose S18 where:

• Smaller petroleum pipe dominates

• Ø200 mm spindle bore is sufficient

• Product range remains below approximately 7 in


Choose S22 where:

• Larger casing is common

• Up to Ø260 mm through-bore is required

• Product range extends toward 9 5/8 in


S22 Compared with S34

S22

• Body swing: Ø720 mm

• Cutting diameter:
Ø220 / Ø245 mm

• Spindle bore:
Ø240 / Ø260 mm

• Petroleum range:
up to approximately 9 5/8 in

• Spindle speed:
200–600 / 200–550 rpm

• Main motor:
22 / 30 kW

• X/Z rapid:
10 / 12 m/min


S34

• Body swing: Ø850 mm

• Cutting diameter:
Ø280 / Ø340 mm

• Spindle bore:
Ø300 / Ø365 mm

• Petroleum range:
up to approximately 13 3/8 in

• Spindle speed:
90–400 rpm

• Main motor:
30 / 37 kW

• X/Z rapid:
8 / 10 m/min


Choose S22 where:

• Medium-size casing dominates

• Ø260 mm spindle bore is sufficient

• Faster axis movement and a smaller machine platform are preferred


Choose S34 where:

• Larger casing and pipe sizes are common

• Greater spindle bore is essential

• Product size extends toward approximately 13 3/8 in

• Higher spindle power is required


S Series Selection Guide

S18

Best suited for:

• Smaller petroleum pipe

• Smaller casing

• Drill-pipe connections

• Product sizes up to approximately 7 in


S22

Best suited for:

• Medium petroleum pipe

• Medium casing

• Drill-pipe and tubular connection machining

• Product sizes up to approximately 9 5/8 in


S34

Best suited for:

• Large petroleum pipe

• Large casing

• Large drill-pipe connections

• Product sizes up to approximately 13 3/8 in


The S18 / S22 / S34 selection should therefore be driven primarily by:

• Pipe outside diameter

• Required spindle through-bore

• Thread size

• Material

• Production requirement


S22 Compared with STC22s

Although S22 and STC22s both cover petroleum tubular applications, they have very different machine concepts.


S22

Positioning:

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

Key characteristics:

• 200 mm cutting length

• Ø240 / Ø260 mm spindle bore

• Up to Ø245 mm cutting diameter

• Product range up to approximately 9 5/8 in

• 22 / 30 kW servo spindle

• IT6 accuracy

• Row-tool production concept

• Optional servo turret


Best suited where:

• Machining is concentrated at the pipe end

• High production efficiency is important

• Repeated thread accuracy is required

• Dedicated petroleum tubular machining dominates


STC22s

Positioning:

• Economical and practical CNC pipe thread lathe

Typical characteristics:

• 1500 / 3000 mm cutting length

• Ø240 mm spindle through-hole

• Ø220 mm maximum through-hole cutting diameter

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

• Maximum spindle speed:
450 rpm

• Conventional longer-bed architecture

• Vertical 4-station turret


Best suited where:

• Longer longitudinal turning is required

• The machine must also perform more conventional lathe work

• An economical pipe-thread platform is preferred


S22 should therefore be viewed as the specialised high-efficiency production machine.

STC22s is the longer-bed economical and more conventional pipe-thread lathe.


Machine Selection and Configuration

The correct S22 configuration should be selected according to the actual tubular product.

Please provide:

• Pipe outside diameter

• Pipe inside diameter

• Product type

• Tubing / casing / drill pipe type

• API or other thread standard

• Thread form

• Thread size

• Thread pitch

• Internal or external thread

• Material grade

• Required machining length

• 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 appropriate S22 spindle bore, tooling and machine configuration according to the actual petroleum tubular product.


Configuration Before Quotation

The following should be confirmed before final quotation:

• Ø240 mm or Ø260 mm spindle bore

• Maximum cutting diameter

• Required petroleum product range

• Thread standard

• CNC system

• Workholding / clamping system

• Row-tool or servo-turret configuration

• Threading-tool package

• Coolant system

• Chip-removal system

• Auxiliary machining unit if required

• Foundation

• Installation requirements

• Electrical requirements

Final technical specifications depend on the selected S22 configuration.

The manufacturer notes that catalogue parameters are for reference and may change with product development.


Complete Your Pipe Thread Machining Setup

MachineryPLUS can also assist with:

• CNC pipe thread lathe selection

• External threading tools

• Internal threading tools

• API thread tooling

• Turning tools

• Grooving tools

• Boring bars

• Thread inserts

• Tool holders

• Workholding

• Measuring equipment

• Coolant solutions

• Chip management

• Tool storage

• Production setup advice


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