Used Horizontal Boring Mills at Auction: A Buyer's and Seller's Guide

A horizontal boring mill is one of the largest and most capital-intensive machine tools that moves through an industrial auction, and a used horizontal boring mill is also one of the most consistently sought-after categories among the 500,000+ industry contacts in KD Auctions' network. Whether it is a table type boring mill retired from a job shop, a CNC boring mill pulled from an aerospace or energy fabricator, or a manual floor type mill decommissioned from a foundry, these machines hold their value because so few plants can justify buying one new. If you are shopping the used market for a used boring mill, or you are a plant owner deciding whether to sell one, understanding what actually drives price and condition matters more here than with almost any other machine tool category. This guide covers both sides of that transaction.

Table Type, Floor Type, and Planer Boring Mills: Know What You Are Buying

Table Type Boring Mills

On a table type boring mill, the workpiece sits on a rotary or traveling table while the spindle head moves vertically and the spindle itself feeds in and out, often on a W-axis quill. This is the configuration most job shops picture when they think of a used boring mill. It is well suited to gearbox housings, valve bodies, pump casings, and mold bases, typically parts in the several-thousand to roughly twenty-thousand pound range depending on the machine. Builders with strong reputations in this segment include Giddings & Lewis, Toshiba (the BTD series is common on the used market), Union, TOS Varnsdorf, Mitsubishi, and Kuraki.

Floor Type and Planer Type Mills

When a part is too large or awkward for a table, floor type and planer type mills put the workpiece directly on floor plates while the column and headstock travel along rails set into the shop floor. These machines show up in structural steel fabrication, wind energy component work, shipbuilding, and heavy press or mill housing repair. Names to know here include Skoda, Giddings & Lewis floor type models, Union, and Innse-Berardi. A floor type mill can weigh well over 100,000 pounds once you include the rail sections, which changes the entire rigging and foundation conversation for a buyer.

What Drives Value in a Used Horizontal Boring Mill

• Spindle diameter: used-market machines commonly run from roughly 4 to 6 inches, and a larger, more rigid spindle typically supports stronger resale because it represents more boring capacity.
• Table size and load rating on a table type machine, or rail length and floor load capacity on a floor type mill.
• Travel in X, Y, Z, and W, plus whether a rotary indexing table (B-axis) is included.
• Control type: a manual mill with a modern DRO still has a market, but a true CNC boring mill running Fanuc, Siemens, or Heidenhain with a full rotary table typically draws a premium.
• A working facing head attachment, which is expensive to replace and adds meaningfully to value when it is present and functions correctly.
• Brand reputation: name-brand mills from builders like Giddings & Lewis, Toshiba, Union, and Skoda tend to hold value best, both domestically and with overseas buyers.
• Documented maintenance history, way rebuilds, and control retrofits.

What to Inspect Before You Bid

Because a horizontal boring mill is a long-term investment and rigging one is not cheap, thorough inspection before bidding matters more than on smaller equipment. Look closely at:

• Spindle runout and bore wear, and whether the spindle taper shows chatter marks or damage.
• Way wear on box ways, which develops over decades of use: check for excessive backlash and inconsistent scraping patterns.
• Ballscrew backlash and any play in the axes on a CNC boring mill.
• Facing head function, including power feed and clutch engagement, if the machine is so equipped.
• Rotary table indexing accuracy and locking, if a B-axis table is present.
• Control power-up, stored alarms, and battery backup status for CNC memory.
• Any geometry, laser calibration, or ballbar test records from the seller's maintenance file.
• Rigging weight and foundation requirements, since some floor type mills need a leveled pit or reinforced slab, and that changes what it costs to relocate.

Buying a Used Horizontal Boring Mill at Auction

KD Auctions runs every sale fully online, so bidders can evaluate a horizontal boring mill from anywhere before committing. Listings typically include detailed photos, specification sheets, and video walkthroughs so out-of-town buyers can assess condition without a plant visit, though an in-person inspection is always worth it on a purchase this size. Bidding runs as a timed online event with clear increments and a published buyer's premium. Because these machines are heavy and usually bolted to a foundation, line up a qualified rigger and confirm site access before the auction closes rather than after. KD's onsite team typically dispatches within 48 to 72 hours of a sale closing to coordinate removal logistics, but the buyer's rigger handles the physical extraction, so getting quotes in advance on crane access, floor loading, and trucking keeps a winning bid from turning into a headache.

Selling or Liquidating a Horizontal Boring Mill

For a plant owner sitting on an idle or surplus boring mill, the used market for these machines is genuinely global. Name-brand table type and floor type mills from builders like Giddings & Lewis, Toshiba, Union, and Skoda regularly draw interest from both domestic job shops and overseas buyers, which tends to support stronger pricing than many other machine categories see at liquidation. Founded by Michael and Arlene Treger in 1996, KD Auctions has run hundreds of auctions and hundreds of millions in machinery sales, and it offers two paths depending on your timeline and goals.

A managed online auction runs 6 to 10 weeks and puts the machine in front of KD's full 500,000+ industry contact network, which is usually the better route when the goal is maximizing sale price on a well-known brand or a CNC boring mill with strong specs. A straight cash purchase is the faster option: KD typically makes an offer within 24 to 72 hours, funds move 3 to 7 days after acceptance, and removal happens within 1 to 2 weeks, which suits a plant working against a lease deadline or a closing date. Commission on a managed auction is tailored to the engagement and quoted upfront, never a fixed percentage, and most sellers pay nothing out of pocket. For sellers who need a defensible number for insurance, estate, tax, or financing purposes, KD also provides AMEA-certified, USPAP-compliant appraisals that are accepted by lenders, courts, and the IRS. To talk through which path fits, call KD Auctions at 480.455.3910.

FAQ

How much is a used horizontal boring mill worth?

It depends heavily on spindle size, table or rail dimensions, travels, whether the machine is manual or CNC, the builder, and physical condition. A smaller manual table type boring mill from a lesser-known builder typically sits at the lower end of the used market, while a large CNC boring mill from a name like Giddings & Lewis or Toshiba with a full set of attachments can be worth substantially more. Because the spread is so wide and specifications vary machine to machine, an AMEA-certified, USPAP-compliant appraisal is the only reliable way to put an exact figure on a specific mill.

Do I need a rigger to move a horizontal boring mill?

Almost always, yes. Even a modest table type boring mill can weigh several tons, and floor type mills with rail sections can run well over 100,000 pounds. Beyond the crane and trucking work, many of these machines were leveled and shimmed on a foundation or in a pit, so a qualified millwright should handle disconnection and re-leveling planning before the move begins. Getting rigging quotes before you bid keeps a good buy from turning into a logistics surprise.

Should I sell my boring mill through auction or take a cash purchase?

It comes down to timeline versus maximum return. A managed online auction over 6 to 10 weeks generally reaches more competitive bidders and tends to produce stronger pricing on desirable name brands, while a cash purchase brings an offer in as little as 24 to 72 hours and clears the floor within 1 to 2 weeks. KD Auctions can walk through both numbers before you decide. Call 480.455.3910 to talk it through.