Used Tos Cylindrical Grinding Machine for sale (65,449)

Condition: refurbished (used), Year of construction: 2004, functionality: fully functional, machine/vehicle number: 027.0149, CNC internal and external cylindrical grinding machine S33 CNC – undergoing refurbishment. Delivery time: approximately 14 weeks. Bodpfxjzcuwbo Al Aeln Technical data and accessories as per the attached PDF. Photo = sample photo only.

Condition: used, grinding diameter 350 mm grinding length 1500 mm centre height 175 mm weight of the machine ca. 3 t High-End Kellenberger 1500U Ideal for spindle producer or overhauler -BEMA Internal grinding device with separate, cooled motor. Grinding spindle and internal grinding spindle motor electrically interlocked! Internal grinding spindle can only be switched on when it is in position. A quantum leap in safety -Infinitely variable grinding spindle speed 1000-1500 rpm -Infinitely variable internal grinding spindle speed 0-100%. -Digital display of grinding spindle speeds -Swivelling angle display top table -swivel angle display grinding headstock -Marposs gaper sensor for external grinding only Bjdpfxjt Ii Rro Al Asln -fluid gating sensor Marposs internal grinding -Center height up to 250mm possible Machine is already delivered. Identical machine can be built with additional with additional options. Die Werkzeugmaschine entspricht zum derzeitigen Zeitpunkt nicht den grundlegenden Sicherheits- und Schutzanforderungen wie in der BetrSichV 2015 genannt. Eine Anhebung des erforderlichen Mindest-Schutzzieles ist mittels einer Gefährdungsbeurteilung nach BetrSichV zu ermitteln.

Condition: used, Year of construction: 2002, grinding diameter 250 mm Bljdjvx Dvuspfx Al Ajn grinding length 400 mm centre height 125 mm Control Fanuc 21i-T Maschine gewartet und teilüberholt. -Neue Schleifspindellagerung -Neue x-Achs Spindel -Obertisch überschliffen -Neue Geometrie Tischgeometrie -Neue Geometrie WSS zu Schleifspindeln B-Achse mit 1° Hirth Verzahnung Längspositionierung HF-Innenschleifspindel GAP Papierbandfilter

Condition: used, grinding diameter 250,350,450 mm grinding length 1000 mm centre height 125,175,225 mm grinding wheel diameter 400 mm grinding wheel width 50 mm bore 127 mm MK5 work piece spindle speed 20-400 U/min grinding head swivelling 360 ° grinding spindle head - swivable 180 + - ° grinding spindle speed 1500,1700,2200 U/min 0,001-0,030 mm/Ø 0-0,95 mm/Ø ±8 ° longitudinal feed of the table 1300 mm table speeds 0,02-6 m/min 130 kg 130 inkl. Spannugkg kg 70 mm total power requirement 6,5 kW weight of the machine ca. 2,5 t Bljdpfxjuxftxo Al Ajn dimensions of the machine ca. 4,2 x 2,0 m As the world’s leading company in Kellenberger overhaul and retrofit we are not only able to deliver machines in a quality similar to a new machine and with warranty, but we can also offer you the service for your o von Kürzlich gelieferten Maschinen mit zusätzlichen Optionen wie: -Spritzschutztüren -Kabine x-Achse -Schwenkwinkelanzeige Schleifspindelstock Geometrisch überholt und neu lackiert mit original Elektrik. Maschine hat Zentralschmierung und Rollenführung in der Flachbahn der x-Achse sowie Luftabhebung im Schleifspindelstock serienmäßig. -Digitalanzeige in 2 Achsen. Auflösung x-Achse 0,5my Optionen: -Drehgeber mit digitaler Anzeige im Werkstückspindelstock -Drehgeber mit digitaler Anzeige im Schleifspindelstock (keine Höhenverstellung mit Spindel möglich) -Neue stabile Innenschleifvorrichtung Durchmesser 80mm oder 100mm mit Höhenjustierung. -Erhöhung der Spitzenhöhe auf max. 225mm -Drehzahlregelung für die Schleifspindel Inklusive: -Bedienwerkzeug -Spannrohr für Futter weiteres Zubehör auf Anfrage. Die Werkzeugmaschine entspricht zum derzeitigen Zeitpunkt nicht den grundlegenden Sicherheits- und Schutzanforderungen wie in der BetrSichV 2015 genannt. Eine Anhebung des erforderlichen Mindest-Schutzzieles ist mittels einer Gefährdungsbeurteilung nach BetrSichV zu ermitteln.

Condition: used, grinding diameter 350 mm grinding length 1000 mm centre height 175 mm dimensions of the machine ca. 3,6/3,5 m As the world’s leading company in Kellenberger overhaul and retrofit we are not only able to deliver machines in a quality similar to a new machine and with warranty, but we can also offer you the service for your is: Kellenberger Kel-Varia Baureihe mit Kelco 90 Steuerung. Mechanische Überholung: -komplette Maschine nach Kellenberger Messprotokoll überholt -Neue servicefreundliche Kabine -Neulackierung Elektrische Überholung: -Neue moderne CNC-RUNDSCHLEIFMASCHINEN-Steuerung -Neu aufgebauter Schaltschrank -Neue Antriebstechnik -Austausch sämtlicher elektrischer Leitungen Berus Druckschalter etc. -Neue Absolut-Glasmaßstäbe in x- und z -Neuer Absolut Drehgeber (Bei-B-Achse) Standardausstattung: -WSS mit Konus MK5, optional mit Adapter MK5/Kurzkegel -RST mit MK4 Konus. Optional mit Feinverstellung -Schleifspindelstock T1/T2/T3 -T1 Schleifscheibendurchmesser 400mm -T2 Schleifscheibendurchmesser 300mm -T3 Innenschleifeinrichtung riemengetrieben. -Schleifspindelmotor 4,4kW -B-Achse hochauflösend -Marposs Messsystem zur Schleifscheibenvermessung. -Längspositionierung Marposs -GAP Control (Sensor am Schleifspindelstock) Optionen gegen Aufpreis: -HF Innenschleifspindel -Hochgenauer, höchst kippsteifer Werkstückspindelstock -Messteuerung Bedpsuwv H Hofx Al Ajln Die Werkzeugmaschine entspricht zum derzeitigen Zeitpunkt nicht den grundlegenden Sicherheits- und Schutzanforderungen wie in der BetrSichV 2015 genannt. Eine Anhebung des erforderlichen Mindest-Schutzzieles ist mittels einer Gefährdungsbeurteilung nach BetrSichV zu ermitteln.

Condition: used, Year of construction: 2010, We offer you: Bsdpfxszrl E Ho Al Aeln 2 units of CNC cylindrical grinding machines Manufacturer: Junker Type: Jumat 3000/50S Year of manufacture: 2010 Control system: Siemens You can find the technical specifications in the images. Accessories, tools and clamping devices shown in the images are only included in the scope of delivery if this is explicitly stated in the additional information. Subject to changes and errors in the technical data and information, as well as prior sale!

Condition: excellent (used), with internal grinding attachment Center height 125 mm Distance between centers 600 mm Bedpfjiu E Trex Al Asln Grinding wheel 400 x 40 x 127 mm Misc.accessories MARCELS MASCHINEN AG

Condition: used, Year of construction: 1989, Technical details: grinding diameter: 300 mm grinding length: 540 mm centre height: 175 mm total power requirement: 20 kVA centre distance: 1000 mm Blsdsy Nk Hmepfx Al Ajn

Condition: not inspected (used), Year of construction: 1976, Spitzl. Cylindrical grinding machine Nomoco M100 Offered here is a grinding machine from the company Nomoco of the type M100. Technical data: Manufacturer: Nomoco Type: M 100 year of manufacture: 1976 max. grinding diameter: 100mm max. grinding length: 180mm grinding wheels: Ø 400mm Bjdpfx Alshc S Spe Asln max. grinding wheel width: 180mm weight: 3,2t grinding type: plunge grinding

Condition: good (used), grinding diameter 450 mm Bodpfx Aexcblqjl Aeln grinding length 600 mm centre height 140 mm workpiece dia. 280 mm number of turns of spindle head 63 - 400 U/min grinding wheel speeds 20-35 m/s dimensions of the machine ca. 2,4 x 1,9 x 2,1 m

Condition: as good as new (ex-display), Year of construction: 2021, operating hours: 10 h, functionality: fully functional, center height: 135 mm, workpiece weight (max.): 70 kg, grinding length: 600 mm, grinding wheel diameter: 405 mm, grinding diameter: 250 mm, grinding spindle motor power: 3,700 W, overall weight: 3,200 kg, pivoting range: 11 °, The machine is equipped with cycle control and is easy to operate; it can process various automatic cycles involving roughing, finishing, and spark-out, but it does not have CNC control. A grinding wheel, dressing diamond, coolant system, and balancing unit are included. Transport and commissioning are available on request. The machine can be inspected under power; it is new and has only been run for demonstrations, not for cutting operations. Bledpfx Alexl Uc Ie Aon

Condition: as good as new (ex-display), Year of construction: 2026, Karstens K11 650 Premium Retrofit Round Grinding Machine Manufacturer: Karstens Technical Specifications: Center distance: 750 mm Center height: 180 mm / (250 mm = Option) Workpiece weight: 100 kg cantilevered, 250 kg between centers Grinding wheel diameter: 400 mm or 500 mm (external grinding wheel) Workpiece spindle: MK 4, speed continuously adjustable 30-450 rpm, swivel range 0 - 90 ° Tailstock: MK4, quill stroke 45 mm, cylindrical correction Quill force: 200-600 N manually, (up to 2500 N possible, adjustable = Option) Table inclination: 12.5 degrees Travel of the feed spindle: 80 mm Rapid traverse: 50 mm Rough adjustment with air cushion: 280 mm Grinding spindle motor, external: 4 kW / (5.5 kW = Option) Continuously adjustable grinding wheel speed with potentiometer Grinding spindle motor, internal: 2.2 kW Workpiece spindle motor: 1.1 kW Hydraulic motor: 1.5 kW Lubrication motor: 0.1 kW Blodpfx Aljiv Audj Aon Hydraulic tank: 80 liters Machine weight: Net 3500 kg Feed drive via DC motor Air cushion-supported rapid adjustment of the grinding spindle head for quick and safe positioning to the grinding location. Separate drive for the spindles for external and internal grinding. Fully automatic operating sequence, feed movement via wind rose switch: Rapid traverse forward, rapid traverse backward, grinding operation, feed stop, incremental feed. Automatic longitudinal grinding cycle Central coolant supply for all grinding points Workpiece spindle head with continuously adjustable drive with a co-rotating and lockable spindle. Feed control, digital with Siemens panel and Siemens PLC for longitudinal grinding and plunge grinding, input for retraction, feed increments, feeds, dwell times, idle strokes, compatible with the old Karstens feed control, with color Siemens touch panel Scale in X and Z axes, manufacturer HEIDENHAIN. Similar to Weiss / EMAG / GP round grinding machines / Studer / Kellenberger / Schaudt / Tschudin / Tacchella / Dannobat / Bahmüller / Fortuna.

Condition: used, grinding diameter 660 mm grinding length 2000 mm workpiece weight 1500 kg grinding wheel diameter 400 mm control X-As. Diatos 602 total power requirement 12/22/30 kW Including: With Diamant Wheel / Plunge Grinding With Spark out / Face Grinding The tech. Data are manufacturer or operator information and therefore non- binding. We reserve the right to prior sale; Our terms and conditions of sale apply exclusively. About us More than 400 of our own machines in stock Over 15,000 m² of storage space, 70 t crane capacity Bjdpfx Aeyqtg Dsl Ajln More than 10,000 items and accessories for your workshop If you are interested in selling machines, production lines, or your business, please contact us. You can find further offers on our website. Tours are possible by appointment. We look forward to your visit. Your Markus Hirsch Team

Condition: ready for operation (used), Year of construction: 2018, functionality: fully functional, center width: 1,200 mm, overall weight: 7,000 kg, travel distance X-axis: 500 mm, travel distance Z-axis: 800 mm, controller model: Bosch Rexroth MTX, TECHNICAL DETAILS Center distance: 1,200 mm Max. outer diameter: 350 mm Max. workpiece weight between centers: 50 kg Cross slide, X-axis Travel, X-axis: 500 mm Max. speed: 30 m/min Resolution: 0.1 µm Longitudinal slide, Z-axis Travel, Z-axis: 800 mm Max. speed: 30 m/min Resolution: 0.0005–0.1 mm Multi-function head, B-axis Swivel range: -45° to +225° Swivel time for 180°: < 3 s Positional accuracy: 0.0002° Repeatability: 1″ Resolution: 0.001° External machining Max. machining length: 750 mm Peripheral speed: 50 corundum / 80 CBN Drive power: 15 kW Max. grinding wheel dimensions: Ø 400 × 50 × 152.4 mm Internal machining Max. bore diameter: 250 mm Max. bore depth: 235 mm Drive power S1: 1.8–7.5 kW Speed range: 30,000–50,000 rpm Bledpfx Aszwm Akjl Aon Workpiece spindle, C-axis Max. speed: 1,500 rpm Drive power: 1.8 kW Drive torque: 90 Nm Resolution of measuring system: 0.001° Roundness accuracy: 0.8 µm Positional accuracy: 0.0001° Tailstock Quill stroke: 50 mm / 80 mm Quill diameter: 60 mm Bearing: hydrostatic Fine adjustment for cylindricity corrections: ± 40 µm 3-point steady rest Clamping range, diameter: 20 – 150 mm Coarse adjustment: 40 µm Fine adjustment: 2 µm Adjustability: stepless MACHINE DETAILS CNC control: Bosch Rexroth MTX Dimensions & Weight Dimensions (L x W x H): 2,850 x 2,470 x 2,290 mm Weight: 7,000 kg EQUIPMENT 3-point steady rest

Condition: good (used), Year of construction: 2003, Ref. -No.: 10618 Manufacturer: KELLENBERGER Type: 600 U Nr. 33 Year of construction: 2003 Type of control: Konventionell Control: n/a Storage location: Halberstadt Country of origin: Switzerland Distance between center: 600 mm Center height (standard): 125 mm Height of centers by lifting work blocks head and tailstock: 175 - 250 mm Bledpoya Dagefx Al Aen Swing diameter with lifting blocks max.: 350 - 500 mm Table swivel / each side: 10 ° Dwell time of the table reversal: 0 - 5 Sec Diameter / width / hole: 250 x 13 x 76 mm Speeds of the grinding wheel spindle: 1500 / 1700 / 2200 / 3600 Swiveling grinding wheel head: 360 ° Cross movement of the grinding wheel head: 285 mm Quickly pulling the wheel head back and forth: 40 mm Intermittent injection for each reversal of the table: 0,001 - 0,03 mm / dia Micro-corrector of the feed, 1 division of the dial: 0,001 mm / Ø Working speeds continuously adjustable (normal / special): 20-400 / 10-400 Max. Grinding length: 900 mm Further information: The machine can be viewed while powered up.

Condition: new, Year of construction: 2024, Grinding wheel D x B 455 x 255 mm, workpiece diameter 1 - 60 mm, regulating wheel D x B 255 x 255 mm, regulating wheel speed 10 - 100 rpm, drive power 11 kW, weight approx. 3.7 tons, dimensions approx. 2,700 x 1,700 mm Machine suitable for continuous and plunge grinding, hardened and ground guideways, grinding and regulating spindle with hydrodynamic three-point bearing, central lubrication for slides and feed spindles, regulating wheel drive via DS motor, frequency-controlled, hydraulic dressing devices for grinding and regulating wheel, electrical equipment predominantly with Siemens components, electrical control cabinet assembled in Germany, Bjdpfx Aledlgq Uo Asln GC 1810-NC with stepper motor and Siemens S7 control for plunge and feed movement. Very economical price/performance ratio.

Condition: excellent (used), Year of construction: 2001, Description to follow! Blsdpjzd E Tzsfx Al Aon

Condition: used, grinding diameter 800 mm grinding length 4000 mm Control SIEMENS Simatic OP3 grinding wheel diameter 800 mm Blsdpfx Aleyqtwie Ajn spindle speeds 0 - 70 mm voltage 400 V 2 x Heavy Duty Steadies Coolant System The tech. Data are manufacturer or operator information and therefore non- binding. We reserve the right to prior sale; Our terms and conditions of sale apply exclusively. About us More than 400 of our own machines in stock Over 15,000 m² of storage space, 70 t crane capacity More than 10,000 items and accessories for your workshop If you are interested in selling machines, production lines, or your business, please contact us. You can find further offers on our website. Tours are possible by appointment. We look forward to your visit. Your Markus Hirsch Team

Condition: used, Year of construction: 2010, grinding diameter 350 mm grinding length 1000 mm centre height 175 mm Control Fanuc 310is CNC control GE Fanuc 310is Hand panel for CNC control GE Fanuc Wenger loader optional Turned part with automatic indexing 1° Grinding head UR 1-2-3 Grinding wheel equipment left 500 x 80 mm Grinding wheel equipment right 400 x 63 mm Operating unit for one high-speed internal grinding spindle MFV / MFZ High-frequency internal grinding spindle MFN 1090 Coolant supply through the workpiece spindle Dressing unit on the upper table Swivelling holder for PCD diamond plates Basic module for KEL-TOUCH gate sensor and KEL-BALANCE balancing devices KEL-TOUCH lead sensor for universal grinding head variants R / RS / UR / URS KEL-TOUCH on the workpiece headstock for internal and external grinding Preparations for Movomatic ESZ 400 or Marposs P7 ME measuring controls Bjdpfxey U N His Al Ajln Preparation for external filters Cooling lubricant switch-off for table devices Full casing emulsion Emulsion sanding mist extraction system Maintenance unit for additional pneumatic functions Preparation for KEL-VITA gantry loader KEL-POS, MOVOMATIC: C25 measuring probe Hydraulic preparation for arobo bezel

Condition: used, Year of construction: 2000, grinding diameter 500 mm grinding length 1000 mm centre height 250 mm -major maintenance -New table geometry -partial painting of the interior grinding wheel equipment LEFT 400x63x127mm (standard) grinding wheel equipment RIGHT 300x40x127mm Internal grinding unit Ø120mm for HF spindles CNC control KELCO 120 C-axis for non-circular grinding. Kel-Poly B-AXIS: CNC-controlled B-axis KELCO 120: v constant 35m/s or 45m/s High-frequency internal grinding spindle Operating unit for MFV and MFZ spindles Hydraulic quill retraction for the tailstock NO micro-adjustment on the tailstock Spring-loaded quill insert Top table cooling Standard workpiece headstock MK 5 DIN 55026 size 5" Micro-adjustment for the standard workhead Dressing device on the lower table Active longitudinal positioning KELPOS, MARPOSS, mounted on the grinding head Tool measuring system KELSET, MARPOSS MARPOSS gate sensor Measuring control MARPOSS Minialsar prepared Paper belt filter Bsdpfx Ajxzk Nijl Ajln

Condition: used, grinding diameter 250,350,450 mm grinding length 1500 mm centre height 125,175,225 mm grinding wheel diameter 400 mm grinding wheel width 50 mm bore 127 mm MK5 work piece spindle speed 20-400 U/min grinding head swivelling 360 ° grinding spindle head - swivable 180 + - ° grinding spindle speed 1500,1700,2200 U/min 0,001-0,030 mm/Ø 0-0,95 mm/Ø ± 6 ° longitudinal feed of the table 1750 mm table speeds 0,02-6 m/min 130 kg 130 inkl. Spannugkg kg 80 mm total power requirement 6,5 kW weight of the machine ca. 2,9 t dimensions of the machine ca. 5,6 x 2,0 m As the world’s leading company in Kellenberger overhaul and retrofit we are not only able to deliver machines in a quality similar to a new machine and with warranty, but we can also offer you the service for your machines. Bsdpfx Aljd Ih Dvs Ajln Geometrisch überholt und neu lackiert mit original Elektrik jedoch neuer WSS Antrieb und Regler in Drehstromtechnik. Optional mit Spritzschutztüren und bedienpult vorne siehe Foto 1000U. -Digitalanzeige in 2 Achsen. Auflösung x-Achse 0,5my Optionen: -Schwenkwinkelanzeige Obertisch -Drehgeber mit digitaler Anzeige im Werkstückspindelstock -Drehgeber mit digitaler Anzeige im Schleifspindelstock (keine Höhenverstellung mit Spindel möglich) -Neue stabile Innenschleifvorrichtung Durchmesser 80mm oder 100mm mit Höhenjustierung. -Erhöhung der Spitzenhöhe auf max. 225mm Inklusive: -Bedienwerkzeug -Spannrohr für Futter weiteres Zubehör auf Anfrage. Die Werkzeugmaschine entspricht zum derzeitigen Zeitpunkt nicht den grundlegenden Sicherheits- und Schutzanforderungen wie in der BetrSichV 2015 genannt. Eine Anhebung des erforderlichen Mindest-Schutzzieles ist mittels einer Gefährdungsbeurteilung nach BetrSichV zu ermitteln.

Condition: used, Year of construction: 1982, grinding diameter 630 mm grinding length 600 mm centre height 320 mm Maschine wird überholt nach Kellenberger Messprotokoll und neu lackiert. Die anfällige Güttinger Steuerung wird durch die zeitgemäße BEMA X Steuerung ersetzt. Das heißt die Maschine erhält in diesem zuge auch eine komplett neue Elektrik. Siehe Beispielfotos. Maschine mit verstärktem Werkstückspindelstock zum fliegend Schleifen von schweren Werkstücken. Bjdpfx Alovq R Uze Aoln Die Werkzeugmaschine entspricht zum derzeitigen Zeitpunkt nicht den grundlegenden Sicherheits- und Schutzanforderungen wie in der BetrSichV 2015 genannt. Eine Anhebung des erforderlichen Mindest-Schutzzieles ist mittels einer Gefährdungsbeurteilung nach BetrSichV zu ermitteln.

Condition: ready for operation (used), Year of construction: 1989, functionality: fully functional, machine/vehicle number: 32.469.3143, center height: 125 mm, grinding length: 1,000 mm, The machine underwent a partial overhaul in 2009. Bedpfx Aszcwfnol Aeln TECHNICAL DETAILS Maximum height: 125 mm Maximum width: 1,000 mm EQUIPMENT Automatic working cycle Intermediate plates 50 mm for a maximum height of 175 mm Vibration-damping pads Machine light Internal grinding device for a maximum diameter of 70 mm Internal grinding spindle UJ7P Coolant supply through the workpiece spindle, including protective cover Side and angled dressing device Swiveling dressing device for internal grinding Dressing stop for internal grinding Collet chuck Set of collets Dial indicator stop for table swiveling with a 1/100 mm dial indicator Sine bar Table fixed stop Strip-type filter system SONY digital measuring system, 2 axes Documentation

Condition: used, grinding diameter 250,350,450 mm grinding length 1500 mm centre height 125,175,225 mm grinding wheel diameter 400 mm grinding wheel width 50 mm bore 127 mm MK5 Bedpod Ih Dwsfx Al Ajln work piece spindle speed 20-400 U/min grinding head swivelling 360 ° grinding spindle head - swivable 180 + - ° grinding spindle speed 1500,1700,2200 U/min 0,001-0,030 mm/Ø 0-0,95 mm/Ø ± 6 ° longitudinal feed of the table 1750 mm table speeds 0,02-6 m/min 130 kg 130 inkl. Spannugkg kg 80 mm total power requirement 6,5 kW weight of the machine ca. 2,9 t dimensions of the machine ca. 5,6 x 2,0 m Overhauled with geometric KELLENBERGER protocoll. Pictures of a similar 1000mm machine. -New electrical cabinet -Modern workhead -Modern tailstock -Modern hydraulic power unit -air lift for grindingwheeel head -modern internal grinding device Extension of the upper table swivel to 10° Optional: -Swivel angle digital read out upper table -Swivel angle digital read out workhead -Swivel angle digital read out grindingwhell head -Splash protection door z-axis -Splash protection housing x-axis etc. ADDITIONAL: -we can offer service for the machines -we can offer technical advice -we can offer training -we have spare parts -we have accessories

Condition: used, Year of construction: 2008, Here are some key details: - CNC universal cylindrical grinding machine WUG 21 base machine by CNC-Technik Weiss. (The WUG 21 features a Karstens machine bed on which the CNC system is mounted.) - Year of manufacture: 2008 / operated in single-shift use only - 1000 mm between centers - Workpiece spindle headstock and tailstock MK4 - Wheel diameter up to 500 mm - Wheel mounting at a 26.5° angle - Grinding wheel drive with programmable SUG - Grinding spindle headstock manually swivellable on air cushion - Wheel positioned on the right - Internal grinding attachment mounted at the rear, including dressing device - Eckelmann control system - DIN programming - Cycle programs Bedpfxjxmurxj Al Ajln - Manual grinding: yes - Automatic dressing - Marposs acoustic emission monitoring for external grinding wheel, including software package - Grinding wheel spindle and workpiece spindle driven by V-belt drive