SL-II Series Slant-Bed CNC Lathes

September 25,2017
SL-II Series Slant-Bed CNC Lathes

Milltronics USA Inc. says its new SL-II series slant-bed CNC lathes are fast, accurate and affordable. The SL-II Series are available in three models: the SL6-II, the SL8-II and the SL10-II. Designed as machines that anyone in the shop can run, they feature Milltronic’s latest series 9000 CNC, which can be programmed either conversationally or with industry standard G and M codes.

These next-generation turning centers from Milltronics are true slant-bed machines with robust roller guideways for superior accuracy and heavy cutting, according to the company. They also feature Yaskawa Sigma V servo motors and drives, plus the ballscrews are doublenut preloaded, pretensioned and anchored on both ends.

SL-II series spindles are manufactured by Royal and feature six rows of bearings. They are permanently grease packed, maintenance free with two rows of roller bearings up front, two rows of ABEC Class 7 P4 preloaded angular contact bearings mounted right behind and in back, two additional rows of roller bearings provide stiffness and rigidity for heavy cutting.

The SL6-II is a fast, compact machine with 6,000-rpm and 1,181-ipm rapids. It has a 6” 3-jaw hydraulic chuck standard with a 2.2” spindle bore. The AC spindle motor is 17.5 hp and has a Yaskawa drive. Maximum part diameter is 12.4” and maximum part length is 13.4.” Standard with a bi-directional 12 tool turret, it uses ¾” x ¾” shank tooling and max. boring bar size of 1.25.”

The popular 8” chuck machine is called the SL8-II. This model has 4,000 rpm, an 8” 3-jaw hydraulic chuck standard and a 3.2” spindle bore. It has a 22-hp AC spindle motor with a Yaskawa drive. Rapid traverse rates are 1,181 ipm. Maximum part diameter is 14” and maximum part length is 20.7.” Standard with a bi-directional 12-tool turret, it uses 1” x 1” shank tooling and max. boring bar size of 1.50.”

The SL10-II is the largest of the new SL-II series. Featuring 10” 3-jaw hydraulic chuck as standard, it has a large 3.62” spindle bore. The AC spindle motor is 30 hp, produces 3,000 rpm and has a Yaskawa drive. Rapid traverse rates are 1,181 ipm. Maximum part diameter is 17.7” and maximum part length is 28.4.” Standard with a bi-directional 12 tool turret, it uses 1” x 1” shank tooling and maximum boring bar size of 1.50.”

All models are available with optional programmable quill tailstocks, Renishaw presetters, lift-up chip conveyors, bar feed interface, parts catchers and/or collet chucks.

According to Louie Pavlakos, Milltronics USA general manager: “The SL-II series machines are the newest additions to our reinvented product line. In the last 2 years, we’ve introduced several new lines of toolroom machines and vertical machining centers. Now, we’ve brought that same level of quality, accuracy and reliability to the Milltronics lathe product line. We’ve designed these machines to be tough and powerful but also affordable and easy-to-use. They all feature the new series 9000 control, which has all the user-friendly features Milltronics is known for, but with upgraded hardware and a new Windows operating system.”

The series 9000 control runs on an Intel dual-core i5 64-bit processor and offers 4 GB memory, 120 GB disk storage, two USB ports and an enlarged 15” LCD color touch screen. An optional feature for the series 9000 is Milltronics Shop View (MSV), which allows users to access machine status and collect usage and diagnostic info per Industry 4.0. MSV is hosted in the cloud and can be accessed with a PC, tablet or smartphone.

Pavlakos says, “the new SL-II series are easy to program so anyone in the shop can run them. They’re perfect machines for small to medium lot sizes or jobs customers have to get out the door in a hurry.”

Related Glossary Terms

  • boring


    Enlarging a hole that already has been drilled or cored. Generally, it is an operation of truing the previously drilled hole with a single-point, lathe-type tool. Boring is essentially internal turning, in that usually a single-point cutting tool forms the internal shape. Some tools are available with two cutting edges to balance cutting forces.

  • boring bar

    boring bar

    Essentially a cantilever beam that holds one or more cutting tools in position during a boring operation. Can be held stationary and moved axially while the workpiece revolves around it, or revolved and moved axially while the workpiece is held stationary, or a combination of these actions. Installed on milling, drilling and boring machines, as well as lathes and machining centers.

  • centers


    Cone-shaped pins that support a workpiece by one or two ends during machining. The centers fit into holes drilled in the workpiece ends. Centers that turn with the workpiece are called “live” centers; those that do not are called “dead” centers.

  • chuck


    Workholding device that affixes to a mill, lathe or drill-press spindle. It holds a tool or workpiece by one end, allowing it to be rotated. May also be fitted to the machine table to hold a workpiece. Two or more adjustable jaws actually hold the tool or part. May be actuated manually, pneumatically, hydraulically or electrically. See collet.

  • collet


    Flexible-sided device that secures a tool or workpiece. Similar in function to a chuck, but can accommodate only a narrow size range. Typically provides greater gripping force and precision than a chuck. See chuck.

  • computer numerical control ( CNC)

    computer numerical control ( CNC)

    Microprocessor-based controller dedicated to a machine tool that permits the creation or modification of parts. Programmed numerical control activates the machine’s servos and spindle drives and controls the various machining operations. See DNC, direct numerical control; NC, numerical control.

  • feed


    Rate of change of position of the tool as a whole, relative to the workpiece while cutting.

  • inches per minute ( ipm)

    inches per minute ( ipm)

    Value that refers to how far the workpiece or cutter advances linearly in 1 minute, defined as: ipm = ipt 5 number of effective teeth 5 rpm. Also known as the table feed or machine feed.

  • lathe


    Turning machine capable of sawing, milling, grinding, gear-cutting, drilling, reaming, boring, threading, facing, chamfering, grooving, knurling, spinning, parting, necking, taper-cutting, and cam- and eccentric-cutting, as well as step- and straight-turning. Comes in a variety of forms, ranging from manual to semiautomatic to fully automatic, with major types being engine lathes, turning and contouring lathes, turret lathes and numerical-control lathes. The engine lathe consists of a headstock and spindle, tailstock, bed, carriage (complete with apron) and cross slides. Features include gear- (speed) and feed-selector levers, toolpost, compound rest, lead screw and reversing lead screw, threading dial and rapid-traverse lever. Special lathe types include through-the-spindle, camshaft and crankshaft, brake drum and rotor, spinning and gun-barrel machines. Toolroom and bench lathes are used for precision work; the former for tool-and-die work and similar tasks, the latter for small workpieces (instruments, watches), normally without a power feed. Models are typically designated according to their “swing,” or the largest-diameter workpiece that can be rotated; bed length, or the distance between centers; and horsepower generated. See turning machine.

  • rapid traverse

    rapid traverse

    Movement on a CNC mill or lathe that is from point to point at full speed but, usually, without linear interpolation.

  • shank


    Main body of a tool; the portion of a drill or similar end-held tool that fits into a collet, chuck or similar mounting device.

  • stiffness


    1. Ability of a material or part to resist elastic deflection. 2. The rate of stress with respect to strain; the greater the stress required to produce a given strain, the stiffer the material is said to be. See dynamic stiffness; static stiffness.

  • turning


    Workpiece is held in a chuck, mounted on a face plate or secured between centers and rotated while a cutting tool, normally a single-point tool, is fed into it along its periphery or across its end or face. Takes the form of straight turning (cutting along the periphery of the workpiece); taper turning (creating a taper); step turning (turning different-size diameters on the same work); chamfering (beveling an edge or shoulder); facing (cutting on an end); turning threads (usually external but can be internal); roughing (high-volume metal removal); and finishing (final light cuts). Performed on lathes, turning centers, chucking machines, automatic screw machines and similar machines.