Knee Mills & Vertical Machining Centers
Used Bridgeport EZ-Trak SX: Sell or Buy at Auction
The Bridgeport Series I knee mill is the most widely produced milling machine in American manufacturing history and is still the default toolroom mill in thousands of shops. The brand later passed to Hardinge, which carried it through the EZ-Trak CNC knee mills and the Torq-Cut and GX vertical machining centers. Used demand stays unusually deep for a design this old, because nearly every working machinist has run one and parts, tooling, and retrofit controls remain easy to source.
The Bridgeport EZ-Trak SX is the earlier of Bridgeport's two 2-axis CNC knee mill control generations, built on the same 9 by 48 inch table with the R8 spindle and 60 to 4,200 RPM head as a manual Bridgeport. It boots from floppy disk on an older processor and was built without room to add a third axis, so it stays a 2-axis machine for life. That makes it a lower cost of entry into CNC milling, and a common candidate for a modern control retrofit since the ballscrews and mechanics are already in place. Auction buyers include budget-focused job shops and retrofitters, reached through KD Auctions' 500,000+ industry contacts.
Buying a Used EZ-Trak SX
Toolrooms, plant maintenance departments, prototype and R&D shops, job shops that want a manual mill alongside CNC capacity, trade schools and community colleges, and short-run fabricators. Manual Series I mills draw the largest and most local bidder pool at any machine shop auction because they move without a rigging crew; EZ-Trak, Torq-Cut, and GX buyers are shops looking for CNC capability in a small footprint.
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A Bridgeport is one of the most reliably sold lots at a machine shop auction: there is always a bidder. What separates a strong result from an average one is condition rather than year, specifically table and way wear, leadscrew backlash, spindle noise, and whether the power feed, DRO, vise, and original tooling stay with the machine.
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Frequently Asked Questions
What is an EZ-Trak SX mill worth at auction?
Value reflects the age and condition of the control, spindle hours, table and way wear, and whether the control still boots reliably from floppy disk, since replacement parts for the original SX electronics are scarce. KD Auctions offers a free AMEA-accredited, USPAP-compliant appraisal covering orderly and forced liquidation value, so you get a realistic figure rather than a guess.
Who buys a used EZ-Trak SX mill?
Two groups compete for these machines: shops that want an affordable, already-CNC knee mill for simple programmable jobs, and retrofitters who plan to strip the older SX control and install a modern system, such as Centroid or LinuxCNC, on the existing Bridgeport frame and ballscrews. Call KD Auctions at 480.455.3910 for a free evaluation of which buyer pool fits your machine.
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About Bridgeport
The Bridgeport Series I knee mill is the most widely produced milling machine in American manufacturing history and is still the default toolroom mill in thousands of shops.
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