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SMTW Cylindrical Grinders — Manual

Shaping the outside of an object with a central axis of rotation, our SMTW manual cylindrical grinders work on cylinders, ellipses, cams, or crankshafts.

Designed for large rolls and shaft-type work, these GM manual cylindrical grinders are the largest of our grinders. These industrial machines are used for steel, paper, aviation, automotive, and military applications.


Built with a heavy-aged cast iron frame, our manual cylindrical grinders by SMTW are precision machined and hand-scraped. Equipped with a hydro-dynamic spindle and a hydrostatic lubrication system on the table and wheelhead ways, our manual series delivers control and versatility.

You can expect reliable function for many years of trouble-free operation along with high accuracy machining.

SMTW GM Series - Manual Grinding Machines

Designed for large rolls and shaft-type work, the SMTW GM series of manual cylindrical grinders are some of the largest machines we offer.

With a history of reliability for the steel and paper industry, these high-precision grinders have also been used for the manufacturing of exotic rolls.

With dead centers, these durable machines provide high levels of repeatability accuracy. A step pulley drive system designed for the work head provides six variable speeds.

A pick feed can also be used to feed on either end of the traverse or both ends along with a variable feed adjuster. As it is a manual machine, the wheel head is retracted by actuating the handle on the feed.

Machine Model Technical Comparison Chart

ModelMax. Grinding DiameterSwing Over Table
GM8
8" (200mm)

10.23" (260mm)

GM12 manual cylindrical grinder
GM12
12.59" (320mm)

13.77" (350mm)

GM12 manual cylindrical grinder
GM20
20" (500mm)

21.00" (535mm)

GM25
24.80" (630mm)

27.16" (690mm)

gm20 manual cylindrical grinder
GM32
31.49" (800mm)

38.97" (990mm)

gm32 manual cylindrical grinder

General Information

  • Machine Types

    Conventional (Manual)

  • Models

    GM8, GM12, GM20, GM25, & GM32

  • Max Diameter Size

    8" - 32"

  • Distance Between Centers

    19" - 79"

  • Manufacturer

    SMTW


About SMTW (Shanghai Machine Tool Works)

SMTW Logo

Shanghai Machine Tool Works Co. Ltd. manufactures machine tools and is the largest of its kind. This Chinese company produces cylindrical grinders for industrial applications with precision measuring instruments.

It was originally established as a Chinese agricultural business in 1946 but was reorganized in 1950 for developing industrial grinding machines. Their facilities cover over 354, 200 square meters and employ over 1,500 people.

SMTW machines are found across the globe in over eighty different countries including the United States and most European countries. They deliver competitive prices and quality machines.


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What types of workpieces can SMTW manual cylindrical grinders handle?

These industrial machines are engineered to shape objects with a central axis of rotation, including cylinders, ellipses, cams, and crankshafts. The GM series is specifically designed for large rolls and shaft-type work, making them essential for high-precision manufacturing in the steel, paper, aviation, automotive, and military sectors.

What are the maximum grinding diameters for the SMTW GM series?

The SMTW GM series offers a broad range of capacities to suit various industrial requirements. The grinding diameter capabilities begin at 8" (200mm) for the GM8 model and scale up through the series to a maximum of 31.49" (800mm) on the heavy-duty GM32 model.

How is precision and durability ensured in these manual grinders?

Each machine is constructed with a heavy-aged cast iron frame that is precision machined and hand-scraped for stability. Accuracy is further maintained through a hydro-dynamic spindle and a hydrostatic lubrication system on the table and wheelhead ways, ensuring smooth, high-accuracy operation and long-term reliability.

What are the technical specifications for the workhead and feed systems?

The workhead utilizes a dead center spindle with a step pulley drive system providing six variable speeds. For feeding, operators can utilize a pick feed on either end of the traverse, or both, supplemented by a variable feed adjuster. The wheelhead is manually retracted via a handle.

Does Ecotech Machine Tool provide support for SMTW equipment in the United States?

Yes. Ecotech Machine Tool provides comprehensive American-based support, including local parts, maintenance services, and hands-on training at their Atlanta showroom. This ensures that operators can maintain machine uptime and achieve local autonomy by bringing high-precision grinding processes in-house rather than outsourcing critical production.

Are CNC versions of these cylindrical grinders available?

While the SMTW GM series focuses on conventional manual operation, Ecotech Machine Tool also brokers advanced CNC and PLC cylindrical grinders from Robbi Group. These European-standard machines offer automated precision and are designed to overcome workforce shortages through increased technical efficiency and easier-to-operate interfaces.

Video Gallery — Cylindrical Grinding Machines In Action

Technical Machine Documentation

SMTW GM Series

SMTW Manual Cylindrical Grinding Machines