Used Naxos-Union Vertical Rotary Table Surface Grinding Machine for sale (69,439)

Condition: used, Year of construction: 1976, grinding length 2500 mm grinding width . mm workpiece height . mm magnetic plate size . mm total power requirement . kW 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 Ijdpeyqtvlsfx Amisib 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: 1980, workpiece diameter 600 mm workpiece weight 400 kg Iijdpot Abrwefx Amieb workpiece height 300 mm total power requirement 35 kW weight of the machine ca. 4500 kg

Condition: used, Year of construction: 2006, grinding length 800 mm grinding width mm workpiece height 400 mm Control Iiodpovkiutofx Amiob total power requirement 60 kW weight of the machine ca. 17 t dimensions of the machine ca. m

Year of construction: 1987, condition: used, Kehren rotary table type RS 7C, second-hand manufacturer: Kehren, Honneff Comm.: 4179 year of construction: 1987 Control: Siemens 3G SPS: Siemens S5 grinding motor: BBC QUB 200 rotary table ø: 750 mm ø grinding head:460 mm Control panel with screen Iedpfohgmwgsx Amisib Coolant system Flushing pump Coolant pump Automatic paper belt filter system Control cabinet

Condition: new, Year of construction: 2025, functionality: fully functional, grinding length: 1,500 mm, grinding width: 300 mm, total length: 3,000 mm, total width: 1,000 mm, grinding height: 150 mm, grinding wheel diameter: 300 mm, overall weight: 2,500 kg, grinding spindle motor power: 11 W, grinding wheel speed: 1,450 rpm, Equipment: documentation/manual, The GRAFS GRfix-1500e is a heavy-duty surface grinding machine designed for rough and high-performance grinding of steel plates. Developed and manufactured entirely in Poland, this model combines robust construction, long service life, and user-friendly electronic control. Main features: - Electromagnetic table 300×1500 mm, S-pole, holding force 120 N/cm² - Grinding motor 11 kW, high-quality Polish production - Segmented grinding wheel Ø300 mm, 6 aluminium oxide segments - Laser sensor for automatic workpiece height detection (as an additional option) - PLC control (Mitsubishi) with 7” HMI touchscreen – programmable grinding cycles (rough pass, automatic downfeed 0.001–0.05 mm, spark-out, pause, auto-stop) - Stepper motor feed with encoder for precise vertical adjustment - Mitsubishi inverter – variable carriage speed 1–16 m/min - Remote diagnostic support via Internet (Wi-Fi connection) - External coolant filtration system MS60 with rotary magnetic drum separator, 150 L tank, and 60 L/min pump - LED 24V working light and internal coolant pipe for table flushing - Powder-coated body: RAL7012 (frame) / RAL7021 (carriage) Mechanical design: - Extremely rigid welded steel body (10 mm thick plates, stress-relieved) - Carriage on PWTR precision rollers for smooth and silent motion - Replaceable hardened steel guide strips - Quick manual positioning of the carriage above the workpiece - Fast up/down movement of the spindle motor for easy tool change - Easy mounting system for the grinding wheel – only three bolts - Maximum workpiece height: 150 mm Optional equipment: - Accordion-type bellows covers - Alternative coolant filtration units (magnetic, paper, or combined) Advantages: - Perfect for rough surface grinding of large steel plates - Designed for high efficiency and long-term stability - Fully European components – Mitsubishi Electric control system - CE conformity, electrical inspection and Polish technical documentation (DTR) included Warranty: 12 months Technical data summary: Parameter Specification Grinding table: 300 × 1500 mm (electromagnetic, S-pole) Max. workpiece height: 150 mm Grinding wheel: Ø300 mm, 6 segments Spindle motor power: 11 kW Carriage speed: 1–16 m/min Downfeed: Automatic 0.001–0.05 mm Control system: PLC + 7” HMI Mitsubishi Isdpjxmhyisfx Amisib Coolant system: MS60 magnetic separator, 150 L tank, 60 L/min pump Weight: ~2800 kg (depending on configuration) Power supply: 400V / 50Hz Made in Poland The GRAFS GRfix-1500e is a professional surface grinder built for intensive, rough grinding applications where high metal removal rate and long-term precision are essential. A reliable, industrial-grade solution for steel fabrication shops, tool manufacturers, and service centers.

Condition: used, Lumsden 93 ML Vertical Spindle Rotary surface Grinding Machine, fitted with 60 inch dia magnetic chuck. Auto sizing. Table Guards, Coolant tank, with pump. Serial Number 93ML 60/11616. Option to be supplied with updated electrical controls, please contact for more details. Under power ready for immediate supply. Iiedpfx Amjy N Ulteijb

Condition: used, Lumsden 92 ML Vertical Spindle Rotary Surface Grinder , 48 Inch dia chuck, autosizing, table jog facility, Filtermist unit fitted with (2) extraction vents to rear of table guards, fitted with segmented wheel, serial number 92ML/109/11821. Machine tools manuals. Coolant filtration tank. Also with unused grinding stones segmented. Isdpfeyabc Eex Amisib Table Diameter 48″ / 1219mm, Segmental Wheel Dia. 28” / 711mm, Max. Height Capacity 22.5″ / 572mm, Spindle Speed 550rpm, Table Speed 6 & 18rpm, Auto Feed 0.004-0.04 ins/min – 0.1-1.0 mm/min, Spindle Motor 50HP / 35Kw, Floor Space 14′ x 11′ / 4394 x 3353mm, Approx. Net Weight 12T/12200Kg, Approx. Gross Weight 13.5T /13700Kg

Condition: new, Year of construction: 2026, Grinding area 1000 x 450 mm, rotary table diameter 1000 mm, grinding wheel 400 x 100 x 127 mm, spindle power 11 kW incl. speed control, electro-permanent magnetic chuck diameter 1000 mm with holding force adjustment, automatic dresser mounted on spindle housing incl. dressing amount compensation, coolant system with paper band filter, user-friendly operation with Mitsubishi PLC control, alternatively SIEMENS 828 CNC control, new machine with 12-month warranty, highest precision at an unbeatable price/performance ratio. Grinding tests can be performed on our exhibition machine. We provide installation and training at your site, as well as future service support. Financing/leasing available, please contact us for an offer! Iedsh I Tz Sopfx Amioib

Condition: refurbished (used), TECHNICAL SPECIFICATIONS Rotary table diameter: 600 mm Magnetic plate diameter: 600 mm Segment holder (or diamond grinding wheel) diameter: 430 mm Maximum grinding height: 400 mm Table rotation speed, continuously adjustable: 1-20 rpm Vertical automatic increments: 0.001 mm Spindle motor power: 37 kW Grinding spindle speed, continuously adjustable: 500-1000 rpm Maximum load on table: 900 kg Net machine weight: approx. 7500 kg Power supply: 400 V +/- 5% 3 Phases, 50 Hz Control circuit voltage = 24 V DC TECHNICAL DESCRIPTION • Frame and uprights made of electro-welded, thermally stabilized steel, with high rigidity and reinforcing ribs. Vertical movement of the spindle head • Precision linear slides • Vertical movements of the grinding wheel head via high-precision ball screws + YASKAWA brushless shaft motor • Vertical movements of the grinding wheel head via electronic handwheel. • Minimum programmable value = 0.001 mm. • Display showing the vertical position of the grinding wheel head, 0.001 mm resolution Transverse movement of the rotary table • Precision linear slides • Transverse movement of the rotary table via high-precision ball screws + YASKAWA brushless shaft motor. • Transverse table movements via electronic handwheel. • Minimum programmable value = 0.001 mm. • Display showing the vertical position of the grinding wheel headstock, 0.001 mm resolution. Spindle Motor • Coaxial spindle with drive motor • Balanced 37 kW spindle motor, without drive belt or coupling. • Frequency converter for continuously variable spindle speed and rapid braking of the spindle motor at the end of the cycle. Rotary Table • Cast iron rotary table with hydrostatic slides. Iiodpfx Amsx N I A Seisb • Drive via Siemens brushless motor • Continuously adjustable table speed from 1 to 20 rpm STANDARD EQUIPMENT • Electropermanent magnetic chuck, 600 mm diameter with parallel poles, complete with electronic control and attraction force adjustment • Electronic handwheel for manual movement of the vertical and transverse axes. • LODI CNC Type T 2000 • Encoder-based measuring system for the vertical and transverse axes. Resolution = 0.001 mm • Automatic cycle with different feed rates for the various cycle phases: roughing, finishing, and sparking. • Cast iron rotary table with hydrostatic slides • Rotary table speed continuously adjustable by brushless motor • Frequency converter for continuous spindle speed adjustment and rapid spindle motor braking. • Coolant system with external collection tray. • External lubrication unit for automatic lubrication of all moving parts. • Complete segment holder (flange) with a set of segments + grinding wheel holder for diamond grinding wheel • Complete work area enclosure with sliding door • Work lights • Set of service wrenches • Documentation in French (1x printed, 1x on DVD) • CE Certificate Lubrication • External lubrication system for lubricating all moving parts. Watering System • Watering system including protective plates and hoses, including a settling tank outside the machine (without filter) Enclosure • Full enclosure with manually operated sliding door CNC Control LODI T2000 type CNC for managing and controlling the machine's axis movements. Automatic work cycle for grinding parts.

Condition: refurbished (used), Year of construction: 2015, functionality: fully functional, TECHNICAL SPECIFICATIONS, MODEL RTR 600 CN Table diameter mm: 600 Electromagnetic chuck diameter mm: 600 Cross travel mm: 350 Max. grinding height with new grinding wheel mm: 400 Table speed, continuously adjustable rpm: 1-200 Gripping wheel dimensions mm: 400 x 50 x 127 Gripping wheel rotation speed, fixed rpm: 1,450 Automatic feed on the vertical axis, min. mm: 0.001 Spindle motor power kW: 15 Max. load on table kg: 1,000 Net weight approx. kg: 5,200 Vertical movement is achieved on linear slides and is driven by a precision ball screw and a YASKAWA AC motor. Vertical axis resolution: 0.001 mm. Measuring system = encoder Dimension read on display. Display resolution = 0.001 mm. Electronic handwheel for manual movement. Transverse movement is performed on linear slides and is controlled by a precision ball screw and a YASKAWA AC motor. Transverse movement is performed by the grinding wheel head mounted on the cross slide. Transverse axis resolution = encoder Dimension read on display. Display resolution = 0.001 mm. Electronic handwheel for manual movement. Rotary table with hydrostatic circular slides. Infinitely variable rotation speed, with YASKAWA AC drive motor. Balanced hardened steel spindle with 15 kW motor. Fixed speed. Option: YASKAWA frequency converter for continuously variable spindle speed (1,100–1,900 rpm) Lubrication unit with automatic lubrication cycle, external to the machine, without initial filling. Standard accessories: - LODI CNC type T 2000 (see photo) - Automatic work cycle with different values ​​for the various cycle phases: roughing, finishing, flash grinding - Digital measurement of the vertical and transverse axes. Resolution = 0.001 mm - Electronic handwheel for manual axis movement - Continuously variable table speed via YASKAWA AC motor. Ijdpfx Amex N I Aljioib Rotary table with hydrostatic slides - Grinding wheel headstock with 15 kW motor. Fixed spindle speed: 1,450 rpm. - Central lubrication for all moving parts - Hydraulic unit located outside the machine - Complete watering system with piping, electric pump, guards, electrical equipment, and a 250-liter settling tank (without filter) - Complete enclosure of the work area with sliding door (open ceiling) - 1 complete flange with grinding wheel - Work light - 1 set of service wrenches - CE Declaration of Conformity + CE plate - Operating voltage 400 V +/- 5%, 50 Hz - Electro-permanent magnetic plate with electronic device for adjusting the attraction force. WAGNER brand, type EP 360 - Ø 600mm - YASKAWA frequency converter for continuous adjustment of the grinding wheel speed (1,100-1,900 rpm) and for braking at the end of the cycle - LOSMA paper filter, type DTE 100 (capacity 300 liters) - LOSMA wet fume extractor, type AS1 (capacity 1,300 m³/h) - "MARPOSS" dynamic grinding wheel balancing device for dynamic and automatic balancing of the rotating grinding wheel - Linear diamond holder mounted on the grinding wheel headstock. Automatic dressing cycle with automatic grinding wheel wear compensation. Diamond increment by AC motor. Resolution 0.001 mm - 1 Diamond - Complete auxiliary pump for washing parts and the magnetic platen

Condition: excellent (used), Year of construction: 2001, XYZ 1224 Surface Grinding Machine Electro Magentic Chuck 304 x 609mm Max. Longitudinal Grinding Length 609mm Max. Cross Grinding Length 304mm Max. Distance from Table Surface to Spindle Centre 508mm Max. Longitudinal Hydraulic Travel 660mm Longitudinal Travel Variable 5 – 25m/min Cross Travel Automatic Increment 0.1-10mm Cross Travel Automatic Travel 304mm Cross Feed Handwheel Per Revolution 5mm Cross Feed Handwheel Per Graduation 0.02mm Down Feed Handwheel Per Revolution 2mm Down Feed Handwheel Per Graduation 0.01mm Spindle Motor Speed 3000rpm 50Hz Spindle Motor Power 5hp Hydraulic Motor Power 1Hp Standard Wheel Dia. 355mm Iiedpfx Aey R N Aijmiob Standard Wheel Width 38mm Stand Wheel Bore 127m Machine Weight 1700kgs Foot Print (LW) 3550 x 2550mm Supplied with: 2 Grinding Wheels Balancing Unit Coolant & Dust extraction Toolbox Hydraulic Tanks Diamond Wheel Dresser 415V Electrics Machine Pads & Levelling Bolts Low Volt Work Lamp For Sale with Jet Machinery Ltd Jet Machinery Stock No: #79197 Machine Serial Number: 134046 Cost: £11,950.00 + VAT Whilst every effort has been made to ensure that the above information is accurate it is not guaranteed. We advise prospective purchasers to check any vital details. Health and Safety At Work Act 1974: It is not reasonably practical for ourselves as suppliers to ensure that for your application the goods comply with requirements of the Act with respect to guarding etc. Prospective purchasers should ensure that a guarding specialist inspect the goods prior to use.

Condition: used, Year of construction: 1989, MAKE GER, MADE IN SPAIN MODEL RS 10/60 YEAR TABLE LENGTH 1300.0 mm TABLE WIDTH 600.0 mm TRAVEL X AXIS: 1600.0 mm Y AXIS: 600.0 mm MAX DISTANCE (TABLE TO WHEEL) 800.0 mm MAX WORKPIECIE WEIGHT 1000 KGS GRINDING WHEEL SIZE 400.0 x 100.0 x 127.0 mm SPINDLE SPEED MAX 1500 RPM MACHINE DIMENSIONS 4600.0 x 2700 x 2600.0 mm MACHINE WEIGHT 7600 KGS Iisdpfxoy Du N Us Amijb PLUS ELECTROMAGNETIC CHUCK SIZE: 1000.0 X 600.0MM HYDRAULIC PACK COOLANT SYSTEM WHEEL MOUNTED DRESSER

Condition: good (used), Year of construction: 2001, grinding length: 650 mm, grinding width: 525 mm, total height: 350 mm, table length: 600 mm, table width: 350 mm, Manufacturer: Geibel & Hotz Type: FS 635-Z SA Control: Digital read out Year of construction: 2001 Magnetic table 600 x 350 mm Closed housing for CE Automatic vertical lubrication SA Automatic lubrication Coolant tank Specifications Metric US Standard X - axis 650 mm Y - axis 525 mm Z - axis 350 mm Table length 600 mm Table width 350 mm Table load 400 Feed X - axis 35000 mm/min. Feed Z-axis Ijdpovdal Ajfx Amieib 1000 mm/min. Grinding stone dimensions 300 x 50 x 76.2 mm Power output 3.7 kW Speed 2800 ? rpm Dimensions (estimate) length 3200 mm width 2000 mm height 2870 mm weight 2300 kg Please note: The information on this page has been obtained from the manufacturer to the best of our knowledge and belief, and where possible, the information is given in good faith but accuracy cannot be guaranteed. Accordingly, it does not constitute a representation or contract and we recommend that you check all relevant details.

Condition: new, Year of construction: 2025, 0800 mm 400 mm 342 mm Iisdpswp Tfljfx Amieb 900x460 mm 355x38x127 mm 2400 U/min

Condition: new, Year of construction: 2025, 0600 mm 300 mm 382 mm Isdpfswp Tpdsx Amisib 700x340 mm 355x38x127 mm 1500 U/min

Condition: new, Year of construction: 2025, 0600 mm 300 mm 342 mm Iiodpjwp Tmvjfx Amisb 700x340 mm 355x38x127 mm

Condition: new, Year of construction: 2025, 0600 mm Isdpfx Amjwp Taioioib 300 mm 382 mm 700x340 mm 355x38x127 mm 2400 U/min

Condition: used, Year of construction: 1991, grinding length: 500 mm, grinding width: 200 mm, Jung JA500-E 1991 Iedpfx Aoy Iy Uksmisib

Condition: excellent (used), Year of construction: 2004, Table size 450 x 150 mm Max. Grinding area 450 x 150 mm Grinding wheel dimensions 180 x 13 x 31,75 mm Min. / max. distance table / spindle center 450 mm Table speed manual Cross feed manual Handwheel, transverse 1 revolution 5 mm 1 graduation mark 0.02 mm Vertical infeed manual Handwheel, vertical 1 revolution 2 mm 1 graduation mark 0.01 mm Grinding motor speed 2900 rpm. grinding motor 1,5 kW Machine dimensions L x W x H approx. 1820 x 1280 x 1950 mm Weight 870 kg Accessories / Special features: - 2-axis digital display - Permanent magnetic clamping plate L x W 450 x 150 mm - Manual grinding wheel dresser - Manual fine adjustment vertical + cross - 1 pc. grinding wheel with flange - Lighting system Ijdpfx Ash Ukrqomioib - exhaust system - Coolant system - Machine feet - CE conform Siegfried Volz Machine Tools Rüschebrinkstr. 151-153 D - 44143 Dortmund - Wambel

Condition: excellent (used), Year of construction: 2008, Table size 600 x 300 mm Max. Grinding area 600 x 300 mm Dimensions of grinding wheel 406 x 50 x 127 mm Min. / max. distance table / spindle center 500 mm Table speed, hydraulic infinitely variable 5 - 25 m/min. cross feed 0,1 - 20 mm Cross feed 900 mm/min. Handwheel, transverse 1 revolution 5 mm 1 graduation mark 0.02 mm Automatic vertical infeed 0.001 - 0.999 mm/time Handwheel, vertical 1 revolution 2 mm 1 graduation mark 0.01 mm Euei3ccb with the AD 5 (automatic infeed) 0.005 mm Grinding motor speeds 1450 / 2900 rpm. grinding motor 1,5 / 3,7 kW hydraulic pump motor 0,75 kW drive motor , transverse 1,1 kW Drive motor , vertical 1,1 kW Machine dimensions L x W x H approx. 2300 x 1800 x 2100 mm Weight 1700 kg Accessories / Special features: - 2-axis digital display - Automatic vertical infeed with spark-out and subsequent upward movement - Electro-magnetic clamping plate L x W 600 x 300 mm - Manual grinding wheel dresser - Grinding wheel speed, 2 steps - 1 pc. grinding wheel with flange - Control panel - illumination - Coolant system with belt filter and magnetic separator - Machine feet - CE conform Iisdpfxsizka Ie Amijb Siegfried Volz Machine Tools Rüschebrinkstr. 11-153 D - 44143 Dortmund - Wambel

Condition: good (used), Year of construction: 1986, functionality: fully functional, Precision surface grinder Degen Type FSHQV300 with digital display Technical data and features: >> Year of manufacture 1986 >> Max. grinding length 300 mm >> Max. grinding width 160 mm >> Working height with new/worn grinding wheel 240/290 mm >> Manual magnetic chuck 300 x 150 mm x 80 mm >> Rapid traverse in the feed direction >> Magnetic chuck >> Total power requirement 2.0 kW Iodpfoy S Ailjx Amisib >> Space requirement length 1.0 m x width 0.9 m x height 1.7 m >> Weight approx. 450 kg About the machine: A precision surface grinder from the German manufacturer Willy Degen, type FSHQV300, is offered for sale. It can be used for surface grinding or plunge grinding with automatic feed. The feed dimension is entered via the digital display. This is a German-made product with high precision and represents a top-quality machine. Take advantage of the opportunity to inspect and test this machine on-site while it is powered up.

Condition: used, Universal swivel, tilting, and rotary table DECKEL Universal add-on table for tool milling machines suitable for FP 2L, FP 3L, or FP 4L No. 2314 Year of manufacture: approx. 1975 Clamping surface: 1000 x 520 mm - 6 clamping slots, 16 mm, spacing 90 mm - Clamping plate can be rotated horizontally to the right and left up to 45 degrees, with scale - Can be tilted to/from the machine +/- 15 degrees - Swivel range +/- 15 degrees - Swivel table, tilting table, angle table Permissible load max. 1000 kg Iiedsd E A I Nspfx Amiob Weight: 400 kg Good condition

Condition: used, Orbital Riveting Machine Double Riveting Automatic with Rotary Indexing Table DUNKES Type DN 4 Rotary table with SIEMENS control system Isdpfx Amodzp T Noioib Machine no. P 81 - 5458 Year of manufacture: 1982 / 2009 Rivet shank diameter max. 12 mm Tool shank diameter 16 mm Throat depth 190 mm Rivet head stroke per riveting unit approx. 60 mm Riveting spindle speed approx. 1,400 rpm Tool-to-anvil installation height max. 80 mm Compressed air requirement 6 bar Motor power per riveting unit 1.1 kW Power supply 380 Volt, 50 Hz - Rotary indexing table with servo drive, indexing step size programmable via Siemens PLC control - Double riveting unit is adjustable within the machine frame relative to the indexing table - Table diameter Ø 295 mm for accommodating round workpieces - Pneumatic riveting stroke motion - Riveting unit adjustment via gear motor with leadscrew, positioning via adjustable micro switch - Modernization of the control system and retrofit with servo drive for the rotary table in 2009 - New electrical control cabinet with Siemens Simatic panel – built in 2009 - Riveting time infinitely programmable - Riveting pressure infinitely adjustable via pressure gauge - Micrometer stop for stroke limitation of the opposing riveting units 0–60 mm Space required L x W x H 3200 x 1250 x 2400 mm Weight approx. 2,500 kg Good condition The machine was used for riveting segment saw blades from Ø 400 to Ø 2000 mm. The segments were manually placed onto the carrier disc and fixed with straight rivet pins. The opposing riveting unit simultaneously rivets the pin from both sides. The controlled table automatically rotates to the next working position after each cycle. Ideal for saw blade manufacturers and repair shops. Alternatively suitable as a basis for constructing a special-purpose machine.

Condition: used, Surface grinding machine BLOHM type HFS 6 make no.: 10493 year of construction 1973 Electro magnetic clamping plate 600 x 300 mm grinding length 600 mm grinding width 400 mm table longitudinal movement max. 650 mm transversal movement 350 mm distance spindle center - table surface max. 600 mm distance spindle center - magnetic plate max. 517 mm Clamping surface table 1020 x 300 mm grinding wheel diameter 300 mm grinding wheel width 50 mm grinding wheel bore 76 mm table longitudinal feed 2-30 m/min infinitely variable table cross feed 2-65 mm stepless electric cross feed 3 m/min vertical feed 0,001 - 0,020 mm per infeed pulse vertical feed 0,250 m/min grinding wheel speed 1400 / 2800 rpm. Motor power hydraulic pump 2,2 kW Motor power grinding spindle 5 / 6 kW Mains connection 380 Volt, 50 Hz. Total power 11 kW - automatic depth adjustment - hydraulic longitudinal table movement - grinding wheel dresser on the headstock - electromagnetic plate height 83 mm Iiedped Hbafofx Amisb - coolant system adjacent, with magnetic filter in filter housing - grinding spindle circulating lubrication - adjacent control cabinet (800 x 500 mm) - swiveling control panel - operating instructions and spare parts manual space requirement L x W x H 3000 x 2200 x 2100 mm weight surface grinding machine 3000 kg weight switch cabinet 200 kg good condition

Condition: ready for operation (used), Year of construction: 1991, grinding length: 1,000 mm, grinding width: 500 mm, travels 1000X550X550MM electromagnetic chuck 1000X500MM grinding wheel 400X80X127MM Iedpoypv Rpsfx Amijib Heidenhain digital readout - Z axis weight 5000KG