Harrison AA 13" Precision Toolmaker's Lathe Manual PDF (EN)

Precision Toolmaker’s Lathe

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A VERSATILE AND SENSITIVE 13” TOOLROOM LATHE 3HP - 3000 RPM VARIABLE SPEED - INCH/METRIC The HARRISON AA PRECISION TOOLMAKER’S LATHE meets the demand for a small, dependable high speed lathe for the toolroom, laboratory, or precision production work. Exceptional versatility is built into the lathe, evidenced by its quiet, full-power variable speed drive; its Universal inch/metric gearbox; its dual reading inch/metric dials; its electronic digital spindle speed indicator; and its numerous operating and safety features. With respect to accuracy, this fine lathe conforms to all universally accepted American and International Precision Lathe Standards.

It accepts all conventional lathe tools and attachments, and is recommended for the most exacting assignments. Throughout the design, strength and rigidity are combined with speed and accuracy to handle the widest range of turning and threading applications. Generously proportioned component parts made from the best materials assure many years of dependable full capacity usage. Simplicity of operation, easy accessibility for inspection and maintenance, and clean-cut appearance are typical Harrison characteristics. Careful consideration is given to the safety of the operator and to compliance with prospective OSHA standards.

Flow-line manufacturing techniques in a modern wellequipped machine tool plant achieve economies allowing the reasonable price levels which make Harrison lathes outstanding values in the world market.

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he world over for accu The Variable Speed Headstock is powered by a well proved variable speed unit driving directly from the motor. Three separate overlapping speed ranges are dial selected, two lower speed ranges through ground gearing, and higher speeds above 800 RPM via direct non-geared drive. Spindle speed is changed by means of a conveniently located hand- The Carriage is a sturdy compact assembly with generous bearing area on the hardened and ground bedways. Wipers are fitted front and rear. Adjustable gibs are provided to take up wear on both compound and cross slides. Dual reading inch/metric dials with adjustable slip rings are fitted to the cross and compound feed screws.

To avoid reading errors, dual dials have rotating shields which expose to view either measuring system, but not both at the same time, a very wheel while the machine is running, and RPM is registered on a lighted digital display. The drive provides full power at all speeds, an unusual capability in variable speed lathes. desirable The headstock has a Vee and Flat fitting to the lathe bed to Preserve original precise alignments, and has a self- .02mm on work diameter, and is equipped with an antibacklash feed nut. The compound rest may be swivelled contained lubrication system. The lathe spindle is exceptionally stiff and mounted in GAMET ultra-precision opposed thrust taper roller bearings.

It invites a generous range of sensitive collet-gripped work as well as conventional chucking applications. A sturdy swiveling chuck guard is mounted 360°. The full length cross slide facilitates the mounting of tracing equipment and other tooling, while providing excellent protection for the feedscrew assembly and around the hardened Reverse is controlled spindle nose. Spindle Forward-Stopby a gated monolever attached to the apron, and a powerful electrically interlocked foot brake is provided.

A Low Voltage Control Center, built into the face of the headstock, contains the lighted spindle speed indicator, a twist-lock master stop button, and pushbuttons for the coolant system and hydraulic tracer when supplied. Nonglaring legend plates show end gear combinations for the wide range of inch and metric threads and feeds, As a convenience to the operator only 16 practical progressive feed selections are charted in the inch system, from .0005” to .020” per revolution, and 16 metric feed rates from .015mm through .5mm, even though end gears supplied with lathe permit over 200 feed and thread combinations. the feature. The cross feed screw reads .001" or guideways.

The Apron is double-walled, with a self-contained lubrication system. A one-shot lube system serves the cross slide and carriage wings. The drop-worm feed control and screw cutting engagement lever cannot be used at the same time The precision leadscrew is reserved strictly for thread cut- ting. The gated monolever for Spindle Forward-Stop-Reverse and threading dial for inch threads are attached to the apron. The handwheel has provision cutting — a valuable safety feature. for nonrotation when The 3HP Main Drive Motor is the totally enclosed fan-cooled type, mounted on the bed behind the headstock for good ventilation and easy access.

All electrical equipment forms to national electrical and fire prevention codes. con-

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racy and durability The Taper Turning Attachment is the telescopic type. The swivel slide is graduated in inches per foot and degrees, 10° each side of parallel. A maximum cut of 10” can be made at one setting. The Lathe Bed is of modern ribbed design, heavily crossbraced to withstand the heaviest cutting forces. All bearing surfaces are induction hardened and precision ground. The bed is securely bolted to a one-piece steel cabinet base, flared for great stability, which contains the electrical control enclosure, motor driven coolant system, and a spacious storage compartment. Hydraulic Copying Equipment is a valuable extension to the usefulness and production capacity of any lathe.

The ex- tended cross slide readily accepts equipment for longitudinal and face tracer turning, copy boring, and high speed threading to tolerance of +.0005” (.015mm). Maximum copying length is 21" (535mm) to a maximum profile depth of 2.5” (64mm). The End Gear Train includes non-metallic intermediate gears for noise-free running without lubrication. This system assures unvarying positive drive, and is far superior to old style belt drives often employed in high speed lathe gear trains. The basic feed and threading ranges may be readily extended using the change gears supplied. A safety electrical disconnect switch is actuated when the end guard is removed.

The Tailstock is the setover type, with lever locks for the quill and bed engagement. Other features are tang drive, drift slot, tool ejection, inch/metric quill graduations, ball thrust bearing, bed wipers. The handwheel has a micrometer dial for fine adjustments. The Universal Gearbox design with total threading is a totally enclosed self-contained capability. lubrication It affords quick system selection change providing of a com- prehensive range of inch, metric, diametral pitch and module threads by means of 3 levers and a rotary dial. The central selector lever may be used to cut feed rate in half, or to double the feed rate, instantaneously.

Gear teeth and clutches are induction hardened. Torque limiting devices on both ‘leadscrew and feed rod protect against overload.

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