Cross-drilled holes, milled flats, and off-center features finished in the same setup as the turning — mill-turn parts done in one, machined in the United States.
Most turned parts are not purely round. A shaft needs a cross hole for a spring pin. A fitting needs wrench flats. A housing needs a bolt circle on the face and a milled slot on the OD. On a plain lathe, every one of those features means a second operation — the part comes off the machine, moves to a mill, gets re-fixtured, re-indicated, and re-inspected. Live tooling lathe machining eliminates that handoff. Powered tools in the turret, driven against a C-axis positioned spindle, drill, mill, and tap those features while the part is still on its turned datums.
The payoff is more than convenience. Every re-fixturing is a chance for a milled feature to drift relative to the turned geometry it has to line up with. When a cross hole must sit on centerline, or a flat must hold a position callout to a datum diameter, cutting it in the same chucking as the turning removes the largest error source in the process. Parts through our ISO 9001:2015 certified production network come off complete, with one inspection chain from first feature to last, and all custom machining is made in the USA.
Live tooling is the right call when the milled content on a turned part is real but secondary: cross-drilled and tapped holes, keyways, hex and wrench flats, face bolt circles, milled slots, off-center drilled features, and thread-milled ports. Routing that same part across two machines doubles the setups, adds a queue between operations, splits the inspection responsibility, and puts a re-fixturing tolerance into every feature-to-feature relationship. On lot sizes from a handful of pieces to steady production, one-and-done mill-turn work usually quotes lower and always ships with less accumulated risk.
We will also tell you when it does not win. If the prismatic content dominates — large milled pockets, deep 3D contours, big flat interfaces — the part belongs on a machining center, with turning as the secondary operation, and we quote it that way. Our job as the single point of accountability is to route each drawing to the platform that produces the best part at the best price, whether that is a live-tooled lathe, a Swiss-type machine, or a VMC with a fourth axis.
The production network operates CNC lathes with spindle bores from 1.625 inch to 3.05 inch, all equipped with live tooling for cross drilling, milling, and tapping in cycle, including a high-precision lathe holding plus/minus .0001 inch repeatability for bearing fits and sealing diameters. Bar-fed work runs unattended within bore capacity; larger diameters and castings run chucked. For turned parts under .812 to 1.50 inch bar, feature-dense work shifts to the network's 5-, 7-, and 9-axis Swiss-type platforms with spindles to 8,000 RPM, where back-working and Y-axis milling complete the same cross features at smaller scale.
Materials routinely run include aluminum, stainless steels including 303, 304, 316, and 17-4 PH, carbon and alloy steels, brass and bronze, and engineering plastics. Routine tolerances of plus/minus .0002 inch apply across the lathe cell, verified with calibrated hand gauging and optical comparator inspection under the network's ISO 9001:2015 program.
The common thread is a turned envelope with milled features that reference the turned datums — work we deliver for instrumentation, robotics, fluid systems, and defense programs alike.
Send the drawing with material and quantity, and call out the relationships that matter: true position of cross features to datum diameters, concentricity or runout requirements, thread specs, and any surface-finish callouts on sealing faces. If a feature only needs to be “about there,” loosening its callout is the single cheapest change you can make — live-tooled milling holds tight position because it never leaves the setup, but tight callouts still buy inspection time. Our RFQ guide walks through the full package.
Cost drivers on mill-turn work are tool count per part (each live tool is a turret station and an index), material machinability, and lot size — bar-fed parts inside the 3.05 inch bore amortize setup quickly, while chucked one-offs carry it all. Quotes come back by email with lead time and any suggested drawing clarifications noted up front. You can also start from the quote request page.
Live tooling means the lathe turret carries powered rotary tools — drills, end mills, taps — in addition to static turning tools. Combined with C-axis spindle positioning, the machine can cross-drill, mill flats, cut keyways, and machine off-center features on a turned part in the same setup, so the part comes off complete instead of moving to a mill for a second operation.
Live tooling wins when milled features are modest in size and must hold position or concentricity to the turned datums — one setup means no re-fixturing error, no second queue, and one inspection chain. If the milled content dominates the part, a machining center is usually the better platform and we route the work that way.
The network runs live-tooled CNC lathes with spindle bores from 1.625 inch to 3.05 inch for bar-fed and chucked work, and 5-, 7-, and 9-axis Swiss-type platforms with .812 to 1.50 inch bar capacity for smaller diameters. Routine tolerances are plus/minus .0002 inch with repeatability to plus/minus .0001 inch.
Chucker and bar lathes from 1.625" to 3.05" spindle bore across the network.
5-, 7-, and 9-axis Swiss platforms for small-diameter mill-turn work.
10 to 1,000 pieces with honest fixturing and revision agility.
The full Quick Brown Fox Solutions service line.
