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Conventional Precision Lathes

Praktikant GS/VC

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Service Conventional/Servo-Conventional Lathes

Model Praktikant GS

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Radial Drilling Machines

Long-term precision and operating convenience


Praktikant GS/VC

Model Praktikant VC

Precision and Efficiency The “Praktikant“ lathe range proves that quality, safety, versatility and straightforward operation can be optimally combined. Regardless of whether one-off or small batch production is required in a handicraft or industrial environment or whether tools, jigs or fixtures are to be manufactured; the Praktikant proves itself as ideal choice for countless applications. It has an inherent versatility that can be expanded through an extensive range of accessories. Attention to detail is the best guarantee for operator safety: Automatic handwheel release Leadscrew and feed rod cover

Spindle brake Securing of pinch points Safety functions extended to include numerous accessories This attention to detail has been confirmed through the receipt of the GS (approved safety) mark for the Praktikant GS in 2003. The acceptance tolerances remain well within final inspection tolerances defined in DIN 8605 – proof of the high quality of the machine. A wide variety of options improve the efficiency of the machine for the production of small and medium-sized batches.

Drive

Digital Readout (VC)

The machine is either equipped with a twospeed motor enabling 16 spindle speeds (Praktikant GS) or with a maintenance-free three-phase asynchronous motor and a current and speed regulated frequency converter (Praktikant VC) with actual value feedback. The advantages of this new drive concept are:

The new digital readout from WEILER / SIEMENS offers further advantages:

Start-up and braking times of 5,000 rpm without work holding fixture below a second Load independent constant speed Short speed regulating times and reversing times, e.g. for thread cutting A safety potentiometer allows the speed to be finely and infinitely optimized during the processing cycle.

Extremely comfortable operation for working with constant cutting speeds High productivity through extreme speed change flexibility Longer tool life Oriented main spindle stop Time reductions through referencing of the axis at any point


The advantages of the conventional range are ultimate precision and operating convenience as well as refined technology.

4/4

Standard Design Main Spindle The main spindle is made of case hardened alloyed steel. It is supported by taper roller bearings to ensure high cutting performance and workpiece surface quality (Praktikant GS).

Apron The apron is fully enclosed and also serves as the centralized lubrication system reservoir for carriage, cross slide and half nuts. Transfer of feed from the feed shaft through the worm gear is interrupted when turning against the stop by an intermediate sliding clutch. Unintentional engagement of the half nut is prevented by a push button.

Main Drive (Praktikant VC) The main spindle is directly driven without a gearbox through low-noise synchronous belts. The feed gearbox is also driven through synchronous belts directly from the main spindle.

Feed Gearbox The gearbox casing is fully enclosed and provided with an oil bath for lubrication of the gear groups. Depending upon load, the gears are either case hardened and ground or nitrified. Three selection knobs allow 24 feed settings or 21 thread pitches, particularly standardized ones, to be selected without even changing gears.

Carriage, Cross and Top Slide The carriage guides are plastic-coated. The primary advantages of this are stick-slip-free start-up of the carriage, smooth running and high workpiece surface quality. The cross and top slide have dovetail guides, play is adjusted through vee-gib strips. The pump in the apron centrally supplies oil to the hardened cross feed screw and its adjustable bronze nut as well as the guideways for the carriage and cross slide.

The advantages are: • high constant torque from 30-2,000 rpm • the complete speed range from 30-4,000 (5,000) rpm is available without gear steps • high efficiency of the synchronous belts and maximum slip-free utilization of the motor’s driving power

Optional Equipment *Pictures may deviate from the standard version Digital Readout 3 axes for carriage, cross and top slide (Z, X and Z0), tool storage for 16 tools, counter with 1 reference point per axis, sum button for Z and Z0, metric/inch switchable, cross travel as diameter or radius display, Delta button for distanceto-go display, resolution upto 0.005 mm, hold position and taper calculator

WEILER Digital Readout for VC Machines with Constant Cutting Speed • Direct speed input • Direct selection of the cutting speed • Freely selectable speed limitation • Status message • Oriented main spindle stop

Mounting of the Digital Readout The scales and feed lines for the digital readout (option) are optimally protected against damage in the working area of the machine through covers and a cable chain.

Angular Tailstock Turret Head for centering, drilling, countersinking and tapping

Lever Operated Collet Chuck for stationary collets (Praktikant GS)

Lever Operated Collet Attachment for stationary and draw-in collets (Praktikant VC)

Headstock

Tailstock

The casing is thick-walled and manufactured from high-quality grey cast iron. This provides the basis for low-vibration running and exceptional dynamic rigidity. High precision, case hardened and ground gears running in an oil bath enable high gear speeds and exceptional turning quality. The gear steps can be easily selected through rotary knobs. The main spindle of the Praktikant VC is directly driven. The high accuracy, precision and constant speed capability is ensured through precision angular contact ball bearings at the front and precision cylinder roller bearings at the rear.

To enable fine tapers to be turned, the top of the tailstock can be moved on a guideway in front or behind the centre line. The hardened and ground tailstock quill is provided with a depth scale which enables exact infeed using a graduated collar.

Bed and Subbase The bed is manufactured from high-quality grey cast iron. Strong transverse ribbing and continuous guides ensure resistance to bending and torsional forces. The separate vee and flat guides for the carriage and tailstock are flame-hardened and ground.

The bed is bonded to the generously dimensioned sheet steel base to further enhance the absorption properties of the complete construction. Located in the base are the drives, electrics, the optionally available coolant system as well as a large lockable

cabinet for the secure storage of collets and other accessories. Desk-type attachments on the front of the base ergonomically accomodate the operating elements.


Standard Equipment Praktikant GS • Socket for machine lighting 230 V • Driver plate 170 mm dia. with protection rim • Taper bush MT5 / MT3 • 2 Male centres MT3 • Multisuisse quick-change toolpost size A • Toolholder AD 2090 • Chuck guard with limit switch monitoring • Rear splash guard • Chip deflector • Change gearbox door with limit switch monitoring • Leadscrew and feed rod protection • Bed stop • Set of change gears 21-33-63-120 T • Central lubrication • 5 Shear pins • Set of wrenches • 2 Instruction manuals with spare parts list • Machine card • NCS enamel Standard Equipment Praktikant VC • As above including partial machine guarding and spindle speed display Optional Accessories Praktikant GS / VC • Increased spindle speed (only VC) • Rotating centres • Follower rest with sliding jaws • Steady rests with roller or sliding jaws • I.D. back stops • Three and four jaw chucks • Independent four jaw chucks • Collet clamping attachments • Angular tailstock turret head • Lever operated drilling attachment for tailstock • Limit switch device for thread cutting • Coolant attachment • Machine lightings • Digital readout with screen display (only VC) • Digital readout (only GS) • Constant cutting speed (only VC) • Further accessories on request Electrical Equipment Praktikant GS • Working voltage 400 V AC 3 PH N / PE / 50 Hz • Control voltage 230 V AC • Contactor control in lockable switch cabinet in subbase • All safety relevant components are electrically interlocked • Mechanical braking and restart protection in case of voltage loss or emergency stop • Emergency stop at headstock and subbase • Safety switch for L.H. / R.H. rotation of main spindle • Two-speed brake motor IP 54 with safety brake, overload protection and temperature sensor • Socket for machine lighting 230 V AC

Technical Data

Praktikant GS

Praktikant VC

Working Range Distance between centres

mm

650

650

Centre heigth

mm

160

160

Swing over bed

mm

320

320

Swing over cross slide

mm

190

190

Main Spindle Spindle nose according to DIN 55027

size

5

5

Spindle diameter in front bearing

mm

70

70

Spindle bore

mm

40

40

Taper in spindle nose

MT

5

5

Main Drive Drive power at 100 %

kW

2.6/3.1

6

Speed range

rpm

48-2,500

30-4,000 (5,000)

Number of gear steps Number of spindle speeds

8

1

16

inf. variable

Feed Range Number of feeds

24

24

Longitudinal

mm/rev.

0.02-0.63

0.02-0.63

Transverse

mm/rev.

0.006-0.2

0.006-0.2

Thread Cutting Range Metric threads without 0,45/0,75/4,5/5,5

mm

0.25-8

0.25-8

English threads with additional change gears

TPI

80-2

80-2

Quill travel

mm

85

85

Quill diameter

mm

40

40

Quill taper to DIN 228

MT

3

3

kg

710

860

Tailstock

Weight

Electrical Equipment Praktikant VC • Working voltage 400 V AC 3 PH N / PE / 50 Hz • Control voltage 24 V AC • Contactor control in lockable switch cabinet in subbase • All safety relevant components are electrically interlocked • Mechanical braking and restart protection in case of voltage loss or emergency stop • Emergency stop at headstock and subbase • Safety switch for L.H. / R.H. rotation of main spindle • Speed display and safety potentiometer for infinitely variable speed adjustment • Force-ventilated main motor IP 54 with safety brake, temperature sensor and shaft encoder • Frequency converter, brake resistance, speed and current regulation • Socket for machine lighting 230 V AC

www.weiler.de WEILER Werkzeugmaschinen GmbH Mausdorf 46 • D-91448 Emskirchen Telefon +49 (0)9101-705-0 Fax +49 (0)9101-705-122 info@weiler.de • service@weiler.de

Technical variations reserved · 07/06 · 5.0915.01.05.01.02

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Technical Data

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