About Southwest Industries

Used Southwestern Industries TRAK CNC Machines for Sale

Resell CNC is your Simple. Reliable. and Trusted.® source for used Southwestern Industries TRAK CNC machines — including TRAK DPM bed mills (DPM, DPM2, DPM3, DPM5, DPME2, DPM SX3P, SX5), TRAK K-Series knee mills (K3, K3SX, K4, K4S), TRAK TRM CNC vertical bed mills, TRAK LPM vertical machining centers, TRAK 2OP portable VMCs, TRAK TMC and TMC7 toolroom machining centers, TRAK VMCsi machining centers, TRAK TRL toolroom lathes (TRL 1630SX, 1630HS-SX, 1745P), TRAK TC2 and TC820si turning centers, and ProtoTRAK CNC retrofits for legacy knee mills. All TRAK machines feature SWI's ProtoTRAK conversational language CNC controls (RMX, RLX, KMX, SMX, SLX, PMX, MX2, MX3, AGE-3) or the SINUMERIK ONE control on production VMC and TC series.

Southwestern Industries, Inc., now formally branded TRAK Machine Tools - Southwestern Industries, Inc., was founded in 1951 by former Lockheed engineer Dr. Fred Jenks in a facility on the border of Culver City and Inglewood, California. Originally established as a job shop producing mechanically actuated electrical pressure switches for flight control systems, the company has been a CNC machine tool manufacturer since 1963 and pioneered conversational language CNC controls. SWI developed the ProtoTRAK conversational CNC for knee mills in the early 1980s, and later in that decade manufactured and sold a version of the ProtoTRAK to Bridgeport Machines who distributed it under the EZTRAK® brand name. SWI moved to its current Rancho Dominguez, California headquarters in 1990. Today SWI operates a 130,000 sq ft engineering, manufacturing, and corporate headquarters in Southern California plus a 120,000 sq ft manufacturing facility in Henderson, Nevada opened in 2021, supported by factory-direct sales, service, and management personnel across North America. All ProtoTRAK controls are designed and built from scratch at the Rancho Dominguez factory.

Looking to sell your Southwestern Industries TRAK? Resell CNC buys used SWI TRAK machines nationwide, every model and every ProtoTRAK control generation, including bundled retrofits and accessories. Free appraisal within 24 hours. Call (844) 478-8181 or email sales@resellcnc.com.

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TRAK Bed Mills, Knee Mills & Retrofits

The TRAK DPM Series (DPM, DPM2, DPM3, DPM5, DPM SX3P, DPME2) is Southwestern Industries' bestselling CNC bed mill platform and the most widely traded TRAK on the used market. The TRAK K-Series knee mills (K3, K3SX, K4, K4S) and TRAK TRM bed mills are designed for toolroom work where flexibility between manual and CNC operation matters. SWI also offers ProtoTRAK CNC retrofit kits that transform legacy Bridgeport-style and other knee mills into 2-axis or 3-axis ProtoTRAK CNC machines, and these retrofitted machines are common on the used market.

TRAK Machining Centers & Lathes

The TRAK LPM vertical machining center was the industry's first VMC that integrated the machine, control, fixturing, and tool offset measurements into one system to reduce changeover time. The TRAK 2OP is a portable VMC designed for secondary operations in high-mix shops. The TRAK TMC and TMC7 toolroom machining centers and the TRAK VMCsi (Siemens SINUMERIK ONE) production VMCs round out the milling lineup. On the turning side, TRAK TRL toolroom lathes (TRL 1630SX, 1630HS-SX, 1745P) and the newer TRAK TC2 and TC820si production turning centers deliver flat-bed CNC turning with manual capability.


Founded	1951 by Dr. Fred Jenks (former Lockheed engineer)
Full Company Name	TRAK Machine Tools - Southwestern Industries, Inc. (SWI)
CNC Manufacturer Since	1963 (62+ years building CNC machine tools)
Headquarters	Rancho Dominguez, California (130,000 sq ft engineering and manufacturing, since 1990)
Secondary Manufacturing	Henderson, Nevada (120,000 sq ft, opened 2021)
Best Known For	ProtoTRAK conversational language CNC controls, toolroom mills and lathes for high-mix low-volume shops
Historical Significance	SWI invented the conversational CNC for knee mills in the early 1980s; built EZTRAK® for Bridgeport Machines
Popular Mill Models	TRAK DPM, DPM2, DPM3, DPM5, K3, K3SX, K4, K4S, TRM, LPM, 2OP, TMC, TMC7, VMCsi
Popular Lathe Models	TRAK TRL 1630SX, TRL 1630HS-SX, TRL 1745P, TC2, TC820si
CNC Controls	ProtoTRAK RMX, RLX, KMX, SMX, SLX, PMX, MX2, MX3, AGE-3 (in-house); Siemens SINUMERIK ONE on production VMC/TC
Industries Served	Toolroom, prototype, mold and die, repair, job shops, R&D, aerospace, medical, education

What to Look for When Buying a Used Southwestern Industries TRAK

Southwestern Industries TRAK machines are built for high-mix, low-volume toolroom and prototype work, with the distinctive ProtoTRAK conversational CNC at the heart of nearly every machine. A well-maintained TRAK delivers years of dependable service. Here is what to inspect on used units.

Identify the ProtoTRAK control generation. ProtoTRAK has evolved through many generations: MX2/MX3 (1990s 2-axis and 3-axis legacy), AGE-2/AGE-3 (late 1990s through 2000s), SMX and SLX (2000s through 2010s mainstream), PMX (machining centers), KMX (knee mills), and current RMX and RLX (mills and lathes). Confirm series, boot status, and software updates. Older MX-era controls may have limited support; SMX, SLX, RMX/RLX remain fully supported.

Inspect the spindle, ways, and glass scales. On TRAK DPM and DPM SX series bed mills, check the box ways or rectangular ways for wear and confirm gib adjustment. On K-Series knee mills, verify knee elevation, table cross travel, and the variable speed head. Test spindle runout, listen for bearing or gearbox noise across the 70 to 4,200 RPM range, and check the power drawbar. Verify glass scale feedback condition, since glass scales are a key ProtoTRAK positioning element.

Verify axes, ballscrews, and motors. Run each axis through full travel at rapid and feed rates and listen for backlash, missed steps, or unusual noise. Check ballscrew preload and lubrication. On LPM, TMC, and VMCsi machining centers, verify the ATC through every pocket and check coolant-through-spindle if equipped. On 2OP portable VMCs, confirm portability features (forklift channels, leveling) and that the integrated tool changer and fixturing are intact.

Check retrofits, lathes, and accessories. If the used machine is a retrofit (ProtoTRAK CNC retrofitted to a manual knee mill including Bridgeport or other host machines), verify the retrofit is correctly installed, encoders read accurately, and the host machine is in good condition. On TRAK TRL lathes, check the flat bed, tailstock alignment, and any turret or live-tool options. Inventory chip auger, coolant, work light, and rigid-tap features.

Southwestern Industries TRAK Machine Series

TRAK DPM Series Bed Mills

The TRAK DPM Series (DPM, DPM2, DPM3, DPM5, DPM SX3P, DPME2) is SWI's bestselling bed mill platform and the most widely traded TRAK on the used market. DPM machines feature ProtoTRAK CNC (legacy MX, current RMX or KMX), tables typically 10 by 50 inches, X/Y/Z travels approximately 31 x 17 x 23.5 inches, 3 to 5 HP spindles, 40-taper tooling. The DPM5 is the largest with 12 by 50 inch table and 40 inch X-travel.

TRAK K-Series Knee Mills

The TRAK K3, K3SX, K4, K4S knee mills offer manual or CNC operation with real handwheels for manual control and ProtoTRAK RMX or KMX for programmed work. K-Series machines feature 10 by 50 inch tables, R8 or NMTB-40 spindles, 70 to 4,200 RPM ranges. Ideal for versatile toolroom milling.

TRAK LPM, 2OP, TMC & VMCsi Machining Centers

The TRAK LPM was the industry's first VMC integrating machine, control, fixturing, and tool offset measurements into one system to reduce changeover. The TRAK 2OP is a portable VMC for secondary operations, debuted around 2017. The TRAK TMC (March 2020) and TMC7 are toolroom machining centers with ProtoTRAK RMX. The newer TRAK VMCsi (October 2021) features SINUMERIK ONE through a Siemens partnership for production.

TRAK TRL Toolroom Lathes & TC Turning Centers

The TRAK TRL Series (TRL 1630SX, 1630HS-SX, 1745P) offers manual and CNC operations with ProtoTRAK SLX or RLX. The TRL 1630SX has 16 inch swing, 30 inch between centers, 2.12 inch spindle bore. The newer TC2 and TC820si (TC820si features SINUMERIK ONE) deliver compact production turning.

How to Sell Your Used Southwestern Industries TRAK

SWI TRAK machines hold steady resale value thanks to ongoing ProtoTRAK control support, the large installed base in North American job shops, and active demand from toolroom and prototype shops. TRAK DPM bed mills, K-Series knee mills, LPM machining centers, and TRL lathes are in steady demand.

Resell CNC buys used SWI TRAK machines, every model and every ProtoTRAK generation, nationwide.

Contact us at (844) 478-8181 or sales@resellcnc.com.
Free appraisal within 24 hours, no obligation.
Accept the offer and we handle rigging, transport, and logistics.

Frequently Asked Questions About Used Southwestern Industries TRAK Machines

Is Southwestern Industries the same as TRAK?

Yes. The company's full current brand name is TRAK Machine Tools - Southwestern Industries, Inc. (SWI). "Southwestern Industries" is the parent company; "TRAK" is the machine tool brand; "ProtoTRAK" is the conversational CNC control. All three names refer to the same Rancho Dominguez, California manufacturer.

What is ProtoTRAK and is it still supported?

ProtoTRAK is SWI's proprietary conversational language CNC, invented in the early 1980s and designed for short-run and prototype machining. Current generations (RMX for mills, RLX for lathes, KMX, SMX, SLX, PMX) remain fully supported with software updates and parts. Older MX-era and AGE-era controls are still serviceable but may have more limited support.

Are used TRAK machines reliable?

Yes. TRAK machines are widely deployed in toolroom and prototype shops across North America. Many 1990s and 2000s DPM bed mills, TRL lathes, and K-Series knee mills remain in daily use, often with original ProtoTRAK controls still functioning.

What is the difference between TRAK DPM and K-Series machines?

TRAK DPM machines are bed mills with a fixed bed and moving column, designed primarily for CNC work with manual capability. K-Series machines are knee mills with a vertically traveling knee, designed for both manual and CNC use with handwheels. K-Series suits classic toolroom work; DPM suits CNC-first toolrooms.

Can I retrofit ProtoTRAK to an older Bridgeport?

Yes. SWI offers ProtoTRAK CNC retrofits that upgrade manual knee mills (including Bridgeport-style machines) to 2-axis or 3-axis CNC with the RMX or KMX control. Retrofitted machines are common on the used market.

What should I inspect on a used SWI TRAK?

ProtoTRAK control series and boot status, spindle and bearing condition, ways and ballscrew preload, axis motion through full travel, glass scale feedback, power drawbar, tool changer function on machining centers, and on retrofits the host machine condition.

How do I sell my used Southwestern Industries TRAK?

Contact Resell CNC at (844) 478-8181 or sales@resellcnc.com. We buy every TRAK model: DPM, K-Series, TRM, LPM, 2OP, TMC, VMCsi, TRL, TC, and ProtoTRAK retrofits. Free appraisal within 24 hours.