NEW SMTCL S18 Series High-Efficiency CNC Pipe Thread Lathe

NEW SMTCL S18 Series High-Efficiency CNC Pipe Thread Lathe

The SMTCL S18 Series is a high-efficiency, high-accuracy CNC pipe thread lathe designed specifically for petroleum pipe, casing and drill-pipe thread machining.

Compared with a conventional general-purpose CNC lathe, the S18 Series is purpose-built around short, large-bore tubular workpieces and threaded petroleum components.

The Series provides:

• Large spindle bore capacity

• High spindle torque

• Servo spindle drive

• Short production-oriented cutting length

• Dedicated pipe-thread machining capability

• Practical high-efficiency production

The S18 platform is particularly suited to customers manufacturing or repairing petroleum tubular products, casing, drill pipe and related threaded components.


S18 Series Positioning

The S18 Series is positioned as a high-efficiency CNC pipe thread lathe.

Its main focus is:

• Petroleum pipe threading

• Casing threading

• Drill-pipe threading

• Short tubular components

• High-efficiency thread production

• High-accuracy repeated machining

Unlike the longer STC pipe-thread lathe platforms, the S18 is built around a short 200 mm cutting length and large spindle bore, making it more specialised for pipe-end and threaded connection machining.


Key Series Specifications

• Maximum body swing: 650 mm

• Maximum cutting length: 200 mm

• Maximum cutting diameter:
140 mm / 180 mm depending on configuration

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

• Spindle speed range:
200–750 rpm
or
200–670 rpm depending on configuration

• Main motor:
22 / 30 kW servo

• Spindle bore:
160 mm / 200 mm depending on configuration

• X-axis travel: 350 mm

• Z-axis travel: 650 mm

• Standard tool carriage:
32 × 32 mm row tool

Final machine configuration depends on the selected spindle bore, cutting diameter and petroleum product range.


Two Main Capacity Configurations

The current supplier-confirmed data shows two principal S18 capacity levels.


160 mm Spindle Bore Configuration

Typical capability:

• Maximum cutting diameter: approximately 140 mm

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

• Spindle bore:
160 mm

• Spindle speed:
approximately 200–750 rpm


Best suited for:

• Smaller petroleum pipe

• Smaller casing

• Drill-pipe connections

• Short tubular threaded components


200 mm Spindle Bore Configuration

Typical capability:

• Maximum cutting diameter: approximately 180 mm

• Petroleum product range:
2 3/8 in – 7 in

• Spindle bore:
200 mm

• Spindle speed:
approximately 200–670 rpm


Best suited for:

• Larger casing

• Larger pipe connections

• Larger drill-pipe threaded components

• Applications requiring increased through-spindle capacity


High-Efficiency Pipe Thread Machining

The S18 Series is designed around short-cycle pipe-end machining rather than general long-shaft turning.

The 200 mm maximum cutting length reflects its intended application:

• End preparation

• Thread machining

• Connection machining

• Short external turning

• Short internal turning

• Facing

• Thread finishing

This specialised layout helps improve productivity where the work is concentrated at the pipe end.


Large Spindle Bore

A key feature of the S18 Series is its large through-spindle capacity.

Available spindle bores include:

• 160 mm

• 200 mm

This allows long tubular workpieces to pass through the spindle while only the pipe end is machined.

The large bore is particularly important for:

• Petroleum pipe

• Casing

• Drill pipe

• Tubular components

• Pipe-thread connections


Servo Main Spindle

The current S18 specification identifies:

• 22 / 30 kW servo main motor

This spindle package provides useful power for:

• Thread cutting

• Pipe-end turning

• Facing

• Internal and external machining

• Repeated production

Final spindle performance should be confirmed against the selected S18 configuration.


Spindle Speed Range

Depending on configuration, the spindle speed range is approximately:

• 200–750 rpm

or

• 200–670 rpm

This relatively low-speed range is appropriate for:

• Large-bore tubular work

• Thread machining

• Larger workpiece diameters

• High-torque cutting conditions


The S18 should therefore not be evaluated against a conventional high-speed CNC lathe simply on maximum rpm.


350 / 650 mm X-Z Travel

The S18 provides:

• X-axis travel: 350 mm

• Z-axis travel: 650 mm

The axis arrangement is designed around:

• Short pipe-end machining

• Tool approach

• External and internal thread cutting

• Facing

• Thread relief and groove machining


Standard Row Tool Arrangement

The current supplier-confirmed specification lists:

• 32 × 32 mm row tool

This tooling arrangement is appropriate for:

• External turning tools

• Internal tools

• Threading tools

• Grooving tools

• Facing tools

The row-tool concept supports straightforward, rigid production tooling for repeated pipe-thread machining.


Typical Machining Operations

The S18 Series 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 S18 Series is primarily suited to:

• Oil and gas

• Petroleum equipment

• Pipe and casing manufacturing

• Drill-pipe manufacturing

• Tubular component production

• Oilfield equipment maintenance

• Pipe-thread repair and reconditioning


Typical Workpieces

Typical workpieces may include:

• Petroleum pipe

• Casing

• Drill pipe

• Pipe couplings

• Threaded tubular components

• Pipe-end connections

• Oilfield tubular accessories

• Short tubular components


Why Consider the S18 Series?

The S18 Series is particularly attractive where a customer needs a specialised machine for efficient petroleum pipe threading rather than a general-purpose CNC lathe.

Key reasons to consider the S18 include:

• 650 mm maximum body swing

• 200 mm maximum cutting length

• 140 / 180 mm cutting-diameter configurations

• 160 / 200 mm spindle bore

• Petroleum product range up to 7 in

• 22 / 30 kW servo spindle motor

• 200–750 or 200–670 rpm spindle range

• X/Z travel of 350 / 650 mm

• 32 × 32 mm row-tool arrangement

• Short-cycle pipe-end machining concept

• High-efficiency production orientation

• High-accuracy pipe-thread machining


S18 Compared with STC22s

S18

Positioning:

• High-efficiency, high-accuracy CNC pipe thread lathe

Typical characteristics:

• 650 mm body swing

• 200 mm cutting length

• 160 / 200 mm spindle bore

• Up to approximately 7 in petroleum product range

• Short production-oriented machining

• Row-tool arrangement


STC22s

Positioning:

• Economical CNC pipe thread lathe

Typical current specification:

• Maximum rotary diameter: 1250 mm

• Cutting length: 1500 / 3000 mm

• Maximum spindle through-hole cutting diameter: 220 mm

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

• Spindle through-hole:
240 mm

• Vertical four-position turret


Choose S18 when:

• Pipe-end threading efficiency is the priority

• Short cutting length is sufficient

• Production is focused on smaller petroleum tubular products

• High-efficiency repeated threading is required


Choose STC22s when:

• Longer workpieces need to be machined

• Larger pipe diameter is required

• General longitudinal turning capability is more important

• Lower-cost conventional pipe-thread architecture is preferred


S18 Compared with S22

The S18 and S22 belong to the same high-efficiency pipe-thread family but cover different workpiece sizes.

S18

• Smaller workpiece class

• Maximum body swing: 650 mm

• 140 / 180 mm cutting diameter

• 160 / 200 mm spindle bore

• Petroleum range up to approximately 7 in


S22

Current supplier-confirmed specification indicates:

• Maximum body swing: 720 mm

• Maximum cutting diameter:
220 / 245 mm

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

• Spindle bore:
240 / 260 mm


Choose S18 where:

• Smaller petroleum products dominate

• 160 / 200 mm spindle bore is sufficient

• More compact capacity is appropriate


Choose S22 where:

• Larger casing and pipe sizes are common

• Larger spindle bore is required

• Larger cutting diameter is needed


S-Series High-Efficiency Pipe Thread Lathe Selection Guide

S18

Best suited for:

• Smaller petroleum pipe

• Casing

• Drill-pipe threads

• Up to approximately 7 in product range


S22

Best suited for:

• Medium-size petroleum pipe

• Larger casing

• Up to approximately 9 5/8 in product range


S34

Best suited for:

• Larger petroleum pipe and casing

• Large thread diameters

• Product range up to approximately 13 3/8 in


This allows the high-efficiency S Series to cover different petroleum tubular sizes without using one oversized machine for every application.


S18 Compared with General-Purpose CNC Lathe

S18 Pipe Thread Lathe

Best suited where:

• Long tubular stock passes through the spindle

• Machining is concentrated at the pipe end

• Petroleum thread forms dominate

• Large spindle bore is essential

• Repeated pipe-thread production is required


General-Purpose CNC Lathe

Better suited where:

• Conventional shafts and discs dominate

• Longer longitudinal turning is required

• Wide workpiece variety is expected

• Pipe-thread work is only occasional


The S18 should therefore be selected for its dedicated petroleum tubular capability rather than as a replacement for a normal general-purpose CNC lathe.


Machine Selection and Configuration

The correct S18 configuration should be selected according to the actual pipe and thread requirement.

Please provide:

• Pipe outside diameter

• Pipe inside diameter

• Product type

• Casing / drill pipe / tubing type

• Thread standard

• Thread size

• Thread pitch

• Internal or external thread

• Material grade

• Maximum raw pipe diameter

• Maximum pipe weight

• Required machining length

• Production quantity

• Required tolerances

• Surface finish requirements

• Tooling requirement

• Chucking / clamping requirement

• CNC control preference

• Coolant requirement

• Chip-management requirement

• Workshop power supply

• Delivery location

MachineryPLUS can assist with selecting the correct S18 spindle bore and pipe-size configuration according to the actual petroleum tubular product.


Configuration Before Quotation

The following should be confirmed before final quotation:

• 160 mm or 200 mm spindle bore

• Maximum cutting diameter

• Petroleum product size range

• Spindle-speed configuration

• CNC control

• Workholding / chuck system

• Tooling arrangement

• Threading tools

• Coolant system

• Chip-management system

• Guarding

• Foundation

• Installation requirements

• Electrical requirements

Final machine specifications depend on the selected configuration.


Tooling for Pipe Thread Machining

A pipe thread lathe requires tooling matched to the exact thread form and material.

MachineryPLUS can also assist with:

• External threading tools

• Internal threading tools

• API-related thread tooling where applicable

• Turning tools

• Grooving tools

• Boring bars

• Thread inserts

• Tool holders

• Pipe-end preparation tools

• Measuring equipment

• Workholding solutions


Final threading-tool selection should be based on:

• Thread standard

• Thread form

• Pipe size

• Material

• Required tolerance

• Production quantity


Complete Your Pipe Thread Machining Setup

MachineryPLUS can assist with the complete machining package including:

• CNC pipe thread lathe selection

• Threading tools

• Turning tools

• Grooving tools

• Boring bars

• Tool holders

• Thread inserts

• Workholding

• Measuring equipment

• Coolant solutions

• Chip management

• Tool storage

• Production setup advice


Explore More from MachineryPLUS

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