2005 Commence business activity

Dohyun Machine Works “DMW” began operation in 2005.

At first the main product was Spur Gears and Chain Wheels for winches.

DMW purchased 3 used Gear Cutting machines that have a capacity of :
Up to 72 inch diameter gears And Up to #1 DP cutters

2008 Initial Growth

DMW purchased a larger shop (#3) and dedicated the facility to EDM Technology.

Installation of an outside slab area designed to round up Bull Gears, container rings and roller paths assure correct fit up and diameters are within tolerance.

Land area 2,310 Sq Meters
Shop area is 460 Sq Meters and is equipped with a 5 tonne crane.

Supply of large Bull Gears using wire cutting “ EDM Technology ” was added to the range of products by DMW.

Gear cutting for small gears and chain wheels were subcontracted instead of in house manufacture. This allowed the shop space to become more efficient to produce and handle the large segmental bullgears.

DMW naturally branched out to the supply of the large roller paths and container rings for the offshore cranes of NOV AmClyde.

DMW also received orders to supply Main Hook Blocks and various weldments for the tackle and revolving systems for AmClyde cranes.

During this time period DMW also quoted and received orders to supply :

• Mooring system components
• Fairlead assemblies and
• Chain stoppers.

Developed DMW's facility expansion plan for the following 4 years (2009-2012) and have elected not to enter into engineering design. DMW’s base is that of a major sub - vendor for existing equipment suppliers. DMW does involve themselves in manufacturing design improvements and recommendations for material conversions.

2009 thru 2010 Growth and Facility Expansion

In 2009 DMW purchased additional property. Total area of the property is 9,240 Sq Meters.

During 2009 and 2010 DMW built the following facilities on above property :

• Assembly Shop - #1 (920 Sq Meters) Equipped with 30/10 ton crane, 10 ton crane and a 5 ton crane. This is a high bay building with the 30/10 ton crane running above the 5 and 10 ton cranes.
• Weld Shop - #2 (441 Sq Meters) Equipped with quantity 1- 10 ton crane and 1 -5 Ton Crane
• Machine shop #1A ( 441 Sq Meters) Equipped with quantity 1- 10 ton crane and 1 - 5 Ton Crane.
• Main Office (400 Sq Meters) complex.

During this period DMW began manufacturing more major components for NOV AmClyde and some smaller structures for other customers.

Main Product Base

• A-Bull Gears up to 20 meter diameter with segmental design.
• B-Large Container Rings for Deck to Tub interface on large cranes.
• C-Hoists and winches.
• D-Fairleads and Chain stoppers
• E-Crane blocks from 40 ton to 4000 ton conventional and underwater designs.
• F-Many small components such as sheaves/ axles / Ball bushings etc.

DMW received their ISO 9001 certification with ABS in 2010.

2011 thru 2012 Purchase additional land and build facility

In 2011 DMW purchased an adjoining property with a total land area is 6,500 Sq. Meters.

• This property had an existing Office and a Shop. The office ( #4A) is 300 Sq meters and was remodeled during 2011. This building contains the Quality personnel, documentation room and cafeteria.
• The existing shop (#4) is 1000 Sq Meters. A 5 ton crane was installed and additional upgrades were completed. This shop is used as an assembly shop, the main warehouse and receiving.
• During 2012 a second High bay building # 6 was constructed. It has a working area of 1,270 Sq Meters and is primarily for fabrication of large structures and assembly. This shop (#6) is equipped with a 30/10 Ton High crane , Qty 1 -15 ton and a 7.5 Ton lower level Cranes.

2013 - An added shop was constructed adjacent to #4 and is shop #7.

The EDM Wire Cutting was moved from #3 shop to #7 shop.
This shop is total of 160 sqm and has a 5 Ton Crane.

Number 3 Shop was then upgraded with a 15Ton/10Ton new crane and runway.
The existing 5 Ton is on the high crane runway.

During this year DMW main Customer was NOV Hydralift AmClyde and we continued supply of our Main Product Base items.

2014 - During this year DMW made acquisition of additional machine tools.

• Toshiba Table Mill 1 Meter X ! Meter CNC
• SNK 3N Planar Miller
• Toshiba Vertical Lathe 2 Meter by 1,8 Meter vertical Travel

Number 3 Shop was designated as the second machine shop and houses the SNK 3N Planar miller and the Toshiba 2M Dia Veritcal Lathe.

Adding of the machines allowed more in house machining and control for DMW Main Product Base items.

2015 - 2018 With the decline in offshore product sales DMW acquired some new customers

NKT joint project for Plate Leveler for Hyundai Steel in Korea

Equatorial Inc. in Singapore for small mooring system Chain Stoppers.
Yanase Inc. Korea for Dredge Crane parts
NOV Norway for some handling assembly’s
American Equipment Singapore
PH Hydraulics Singapore


NOV sales went down and so DMW main customer base was very low and we had to downsize our labor force accordingly but maintained our experienced office staff and main shop personnel.