Used Gildemeister Ctx 400 E for sale (237)

Condition: ready for operation (used), Year of construction: 2010, Max. workpiece diameter: 25mm, max. workpiece length: 100mm, max. bar diameter: 25mm, max. stroke X/Z: 42mm/50mm, rapid traverse: 40m/min, number of spindles: 6, speed: 12000rpm, control: Siemens 840D Powerline. Nodpfetqfq Uex Ahkolf

Condition: used, Year of construction: 2006, spindle speed (max.): 5,000 rpm, total width: 45,000 mm, total length: 19,900 mm, total height: 23,000 mm, travel distance X-axis: 165 mm, travel distance Y-axis: 80 mm, bar length: 600 mm, CNC Lathe (with 2nd spindle, 3 turrets and Y-axis) Spindle bore diameter 65 mm Spindle speed 5.000 R/min Spindle motor 25/20 kW Spindle speed counter spindle 5.000 R/min X-axis movement 165 / 165 / 165 Y-axis movement 80 mm Z-axis movement 220 / 150 / 650 mm W-axis movement (subspindle to mainspindle) 690 mm C-axis indexing 0,0001° Number of turret 3 Number of tools on turret 12 (3x 12) Nlodpfx Ajy Nyg Ajhkof Tool taper VDI 30 Bar feeder LNS Quick Load Servo 65 If you have any questions concerning the machine, please do not hesitate to contact us by phone or e-mail. Feel free to view our other advertisements for a complete overview of our stock.

Condition: used, Year of construction: 2006, spindle speed (max.): 5,000 rpm, total width: 45,000 mm, total length: 19,900 mm, total height: 23,000 mm, travel distance X-axis: 165 mm, travel distance Y-axis: 80 mm, bar length: 600 mm, CNC Lathe (with 2nd spindle, 3 turrets and Y-axis) Spindle bore diameter 65 mm Spindle speed 5.000 R/min Spindle motor 25/20 kW Spindle speed counter spindle 5.000 R/min X-axis movement 165 / 165 / 165 Y-axis movement 80 mm Z-axis movement 220 / 150 / 650 mm W-axis movement (subspindle to mainspindle) 690 mm C-axis indexing 0,0001° Number of turret 3 Number of tools on turret 12 (3x 12) Tool taper VDI 30 Bar feeder LNS Quick Load Servo 65 Nedpfjy Nyrxsx Ahkslf If you have any questions concerning the machine, please do not hesitate to contact us by phone or e-mail. Feel free to view our other advertisements for a complete overview of our stock.

Condition: used, turning diameter over cross slide: 185 mm, turning length: 250 mm, turning diameter: 280 mm, spindle bore: 50 mm, spindle speed (min.): 6,000 rpm, travel distance X-axis: 180 mm, travel distance Z-axis: 285 mm, total height: 1,730 mm, total length: 2,180 mm, total width: 1,610 mm, overall weight: 3,000 kg, General Application: The Gildemeister CT 20 is primarily used in precision machining, especially for the production of complex components in industries such as the automotive industry, aerospace, and general mechanical engineering. Due to its capabilities, it is suitable for tasks that require high accuracy and efficiency in turning operations. Advantages: - The compact design allows for efficient use of space in manufacturing environments. - The high spindle speed of 6000 rpm enables fast machining and reduces cycle times. - The versatile turret with 12 tools and 8 rotating tools increases productivity, as multiple machining operations can be performed without tool changes. Njdozi Uqgopfx Ahkelf - The robust spindle motor power of 7.5 kW ensures consistent performance even under heavy workloads. - The precise machine travels in the X and Z axes facilitate complex machining operations and contribute to high-quality production. Buffer battery is low, machine data needs to be checked!

Condition: used, Gildemeister italiana GD16 with LNS loading magazine Main spindle & capacities: - Max. turning diameter: 16 mm - Max. spindle bore: 16 mm - Max. turning length: 160 mm - Max. spindle speed: 8,000 rpm - Spindle power: 1.5 kW to 2.2 kW Axes & feed rate: - Rapid traverse: 30 m/min - Control system: GE FANUC Series 18i-T Dimensions & connection values: - Total power requirement: approx. 2.2 kW to 5 kW Nljdpfxey D Nw Tj Ahkjf - Machine weight: approx. 1,600 kg to 2,100 kg - Machine dimensions: approx. 1,100 mm (width) × 1,800 mm (height)

Condition: used, Year of construction: 2007, turning diameter 246 mm Nlodpfx Ahexuv R Sekjf turning length 445 mm control Fanuc 32 weight of the machine ca. 4250 kg

Condition: used, Year of construction: 2001, turning diameter . mm Nsdpsyqwb Ejfx Ahkslf turning length . mm control . type . CCUO turning diameter over slide rest . mm cross movement . mm spindle passage . mm turning speeds . U/min transmission ratio . quill stroke . mm rapid traverse . m/min main drive motor . kW 3-jaw-chuck diameter . mm total power requirement . kW weight of the machine ca. . t dimensions of the machine ca. . m 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

Year of construction: 2004, condition: ready for operation (used), A Gildemeister CNC double-spindle turning and milling center including coolant system and chip conveyor is available. Turning diameter over bed: 640mm, machining diameter: 400mm, center distance: 1930mm, travel X/Z: 550mm/1585mm, travel Y: +/-110mm, B-axis: +/-120° (interpolating), C-axis: 360°. Main spindle: power: 36kW/45kW, speed: 4000rpm, torque: 600Nm-730Nm, bore: 107mm. Milling spindle: Speed: 12000rpm, power: 13.2kW/22kW, torque: 100Nm. Tool places: 60, carrier: turret 12-fold star SW 380, machine dimensions X/Y/Z: approx. 9300mm/4600mm/3100mm, weight: approx. 20000kg, control: Siemens Sinumerik 840D powerline. Documentation available. On-site inspection is possible. Nledpfx Ahowmdv Ajkof

Condition: used, Year of construction: 1999, control Heidenhain centre distance 1400 mm weight of the machine ca. 3,6 t Handwheel defective Njdpfx Ahjw Syd Sekelf

Year of construction: 2008, condition: ready for operation (used), Main spindle: max. bar capacity: 65mm, draw tube bore: 75mm, collet holder diameter: 160mm, centering chuck diameter: 175mm, spindle nose: 140mm, max. speed: 5000/min, nominal torque (S1): 150Nm, nominal power (S1): 22kW. Counter spindle: draw tube bore: 45mm, centering chuck diameter: 175mm, spindle nose: 140mm, max. speed: 5000/min, nominal torque (S1): 100Nm, nominal power (S1): 16.8kW. W2 axis counter spindle: travel: 690mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. X1 axis: travel: 165mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. Z1 axis: travel: 220mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. X2 axis: travel: 165mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. Z2 axis: travel: 150mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. X3 axis: travel: 165mm, max. speed: 40m/min, max. acceleration: 10m/s², nominal thrust (S1): 2400N. Z3 axis: travel: 678mm, max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. Y3 axis: travel: 80mm (+50/-30), max. speed: 30m/min, max. acceleration: 5m/s², nominal thrust (S1): 5000N. Workpiece unloading (UA-WA): max. unloading weight: 4daN, max. unloading diameter: 70mm. Total number of tool stations: 12, tool holder diameter: 30mm, driven positions: 12, max. speed of driven tools: 4000/min, nominal torque (S1-n = 0/min): 17Nm, nominal power (S1-n = 4000/min): 2.9kW, control: Siemens 840D, operator panel: ErgoLine, screen: color TFT 19 inch, number of spindles (C-axes): 2, number of axes: 10, number of channels: 4. Operating hours: 70,035h power on, 48,657h in production, machine operates with cutting oil. With documentation and Bar Loader FMB Turbo 8-80 XT 3200. An on-site inspection is possible. Nlodpfx Aeyln Ekehkjf

Condition: used, Year of construction: 2005, turning diameter 640 mm turning length 1.185 mm control SINUMERIK 840D swing diameter 640 mm distance of spindle heads 1500 mm slide I: X1 / Y1 / Z1 / B slide travel X-axis 550 mm slide travel Z-axis 180 mm Z- Travel 1.185 mm B - axis 240 ° feed x-axis 0 - 40.000 mm/min feed y- axis 1 - 24.000 mm/min Feed z- axis 1 - 70.000 mm/min feed B-axis 1 - 20 1/min rapid traverse X/Y/Z 40 / 24 / 70 m/min feed capacity X/Y/Z S6: 7,00/11,00/7,50 kN tool taper HSK 63 turning speed milling-spindle 10 - 12.000 1/min power capacity at 100 % load 13,20 kW power capacity at 40 % load 22,00 kW torque milling spindle 60 / 100 Nm no. of workpieces in the magazine 46 Stück tool length - max. 350 / 200 mm tool diameter 80 mm wotkpiece diameter with 2 vacant positions 120 mm weight of tools max. 6 / 10 kg slide II: X2 / Z2 slide travel X-axis 180 mm Z- Travel 1.050 mm feed x-axis 1 - 24.000 mm/min Feed z- axis 1 - 36.000 mm/min rapid traverse x + z axis 24 / 36 m/min feeding force S6: 11,00/9,00 kN turret (x-stations) 12 tool taper DIN 69880 Ø40 Driven tools - quantity 12 Driven tool turning speed 1 - 4.000 1/min power capacity at 100 % load 10,70 kW torque S1: 32 Nm Slide III - longitudial travel Z3 mm Z- Travel 1.150 mm Feed z- axis 1 - 36.000 mm/min rapid traverse Z-axis 36,00 m/min feed capacity Z - axes S6: 13,00 Nm Main spindle ISM90 turning speed main-spindle 10 - 4.000 1/min power capacity at 100 % load 36,00 kW power capacity at 40 % load 45,00 kW max. torque at 40% / 100% load 800 / 630 Nm spindle bore 80 mm turning speed opposed-spindle 10 - 5.000 1/min power capacity at 100 % load 21,00 kW power capacity at 40 % load 28,00 KW max. torque at 40% / 100% load 320 / 240 Nm spindle bore 80 mm total power requirement 70,00 kW weight of the machine ca. 20,00 t Nlodsydfllspfx Ahkof dimensions of the machine ca. 8,50 x 4,50 x H3,10 m Machine with SIEMENS SINUMERIK 840D control, main- and counter-spindle, chip conveyor, dust exhauster, DMG-automation WH10top. Main-spindle ISM90: hollow clamping device, C-axis, 3-jaw hydraulic chuck SMW-AUTOBLOK KNCS-NB-315-91 Counter-spindle ISM76: closed center clamping device, C-axis, 3-jaw hydraulic chuck SMW-AUTOBLOK KNCS-NB-315-91 Pick-up device with integrated conveyor belt, automatic protective cover, differential pressure clamps. Incl. pump-frame for coolant - Pump 1: 17 l/min at 80bar - Pump 2: 20 l/min at 8bar - Pump 3: 40 l/min at 20bar Without coolant unit. Was connected to a central coolant-system. Accessories: Hainbuch collet chuck incl. collets Ø30,45,50,55,60,65,72,82,85,90 1 piece workpiece pick-up-gripper for turret

Condition: ready for operation (used), Year of construction: 1987, functionality: fully functional, machine/vehicle number: 08500, turning diameter over cross slide: 225 mm, turning length: 1,000 mm, turning diameter: 400 mm, spindle speed (max.): 4,000 rpm, controller model: EPL 2, TECHNICAL DETAILS Maximum turning diameter: 400 mm Turning length: 1,000 mm Swing diameter over bed: 400 mm Swing diameter over cross slide: 225 mm X-axis travel: 260 mm Z-axis travel: 1,040 mm Main spindle Speed range: 20 - 4,000 rpm Drive power: 11 kW Maximum torque: 75 Nm Spindle bore: 72 mm Chuck diameter: 185 mm Spindle nose: 140H5 Spindle diameter at front bearing: 100 mm Tool turret Number of tool stations: 12 positions Tailstock Quill diameter: 80 mm Quill stroke: 100 mm Tailstock taper: MT 4 Maximum quill pressure: 8,000 N Feeds Rapid traverse (X/Z axis): 10 m/min Feed speed (X/Z axis): 5 m/min Feed force (X axis): 5,000 N Feed force (Z axis): 8,000 N Nlsdpfxeyxm Tne Ahkef MACHINE DETAILS Control model: EPL 2 Operating voltage: 380 V Frequency: 50 Hz Operating current: 76 A Total power requirement: 29 kW Dimensions & Weight Space requirement approx.: 4.6 x 2.1 x 2.0 m Machine weight approx.: 4.0 t EQUIPMENT Chip conveyor Three-jaw chuck Documentation

Condition: good (used), Year of construction: 1985, CNC Lathe GILDEMEISTER Type: N.E.F. 1020 Year 1985 Control EPL 2 Turning diameter over bed : 1020 mm Turning diameter over face plates : 600 mm Turning length : 3000 mm Spindle speed : 5 - 1120 rpm Motorl.30 KW Nlodpfx Ahjqc Ul Aekof Spindle bore : 128 mm Tool turret Parat size : 4 with 10 holders Faceplate : 900 mm, steady rest, drill stand, chip conveyor, complete machine documentation and parameters available. Machine disassembled in stock. Complete weight approx. 12 000 KG. Further data see data sheets .

Condition: repair required (used), Year of construction: 2011, operating hours: 8,545 h, functionality: not functional, turning length: 310 mm, spindle speed (max.): 6,000 rpm, travel distance X-axis: 190 mm, travel distance Y-axis: 80 mm, travel distance Z-axis: 370 mm, mount diameter: 30 mm, Condition: Non-functional. The machine has an unknown malfunction in the turret, making referencing and axis movement impossible. The machine requires repair! TECHNICAL DETAILS Turning length: 310 mm Swing diameter over bed: 500 mm Swing diameter over cross slide: 290 mm Distance between centers: 500 mm X-axis travel: 190 mm Z-axis travel: Z1: 335 / Z3: 370 mm Y-axis travel: 80 mm Control: Heidenhain CNC Pilot 4290 Nodow T Srdspfx Ahkelf Spindle speed: 6,000 rpm Spindle bore: 73 mm Bar capacity: 50 mm Main spindle torque: 95 Nm at 100% and 127 Nm at 40% Tool turret - number of stations: 12 Tool holder: VDI 30 mm Rapid traverse X + Z axes: 30 m/min MACHINE DETAILS Total power requirement: 20 kVA Chip conveyor dimensions (LxWxH): 3.2 x 0.45 x 1.5 m Operating hours (on-time): 36,443 h Spindle hours: 8,545 h Interface: yes EQUIPMENT - 160 mm 3-jaw chuck with matching flange - 2 sets of spare jaws - 12-station turret with driven tooling - Sauter disc turret (C-axis = 300 rpm) - Chip conveyor 450 K-1/250; year of manufacture 2000 - Manual chuck fitted – no hydraulic chuck - Electrical cabinet with Rittal cooling

Condition: good (used), Year of construction: 2007, operating hours: 27,896 h, functionality: fully functional, machine/vehicle number: 2101-0171, turning diameter: 20 mm, rotational speed (max.): 10,000 rpm, torque: 14 Nm, Equipment: bar feeder, chip conveyor, TECHNICAL DATA Max. turning diameter: 20 mm Tool body diameter: 20 mm Spindle positioning resolution: 0.1° Main spindle Rated power: 3.7 kW Maximum power: 5.5 kW Torque: 14 Nm Rated torque: 9.4 Nm Speed: 10,000 rpm Axis data Linear axis Z1 / X1 / Z1 – Stroke: 80 / 35 / 240 mm Linear axis Z1 / X1 / Z1 – Rapid traverse (max.): 40 m/min Linear axis Z1 / X1 / Z1 – Acceleration (max.): 10 m/s² Linear axis Z1 / X1 / Z1 – Nominal force: 1,250 N Linear axis Z2 / X2 – Stroke: 180 / 230 mm Linear axis Z2 / X2 – Rapid traverse (max.): 40 m/min Linear axis Z2 / X2 – Acceleration (max.): 10 m/s² Linear axis Z2 / X2 – Nominal force: 1,250 N Tool holder Nljdpfx Ahsy Dr S Hokjf Number of fixed tools (internal): 6 Diameter: 20 mm Number of fixed tools (external): 4 Tool shank size: 12 × 12 mm Number of driven tools: 4 Collet type: ESX 16 MACHINE DETAILS Control: Fanuc 16iT Machine dimensions (L × W × H): 2,275 × 1,300 × 1,760 mm Weight: 2,600 kg Connected load: 21 kVA Power-on hours: 85,620 h Operating hours: 27,896 h EQUIPMENT - Bar feeder FMB Turbo 3-36 / 4200 / A, year of manufacture 2007 - Coolant tank with chip conveyor - Central lubrication - Hand-held control unit - Documentation available

Condition: good (used), Year of construction: 2006, Control unit MANUAL PLUS 4110 Njdpsx Tg T Rsfx Ahkolf

Condition: used, Year of construction: 2001, turning diameter 320 mm turning length . mm Nledsyqtdiopfx Ahksf control Siemens type . CCUO turning diameter over slide rest . mm cross movement . mm spindle passage . mm turning speeds . U/min transmission ratio . quill stroke . mm rapid traverse . m/min main drive motor . kW 3-jaw-chuck diameter . mm total power requirement . kW weight of the machine ca. . t dimensions of the machine ca. . m 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

Year of construction: 1982, condition: ready for operation (used), A CNC lathe Gildemeister including a chip conveyor and a Forkat chuck is available. 1) Gildemeister NEF CT 60, year of manufacture: approx. 1982, distance between centers: 1000mm, turning length: 1000mm, max. turning diameter: 460mm, center height: 300mm, bed width: 450mm, spindle bore: 107mm, speed: 3015rpm, tool stations: 12, quill diameter: 100mm, quill stroke: 180mm, machine dimensions X/Y/Z: approx. 5400mm/2100mm/2000mm, weight: approx. 7000kg. 2) Chip conveyor Allweiler GB 30L 38L. Without Filter. Documentation available. An on-site inspection is possible. Njdpfxoydp Azo Ahkelf

Condition: reconditioned (used), Year of construction: 2003, Universal Lathe GILDEMEISTER NEF 320 K With Siemens SINUMERIK 810 DE control (SIMATIC PANEL TOUCH SCREEN) Year of manufacture: 2003 Spindle bore: 52 mm Distance between centers: 750 mm Swing diameter over bed: 320 mm Swing diameter over cross slide: 150 mm Cross slide travel: 185 mm Infinitely variable speed range: 14 – 3550 rpm Including the following accessories: Nlodpjxn Ar Aefx Ahkjf Sliding guard with internal lighting Multifix tool holder with 2 inserts 3-jaw chuck SCHUNK ROTA plus Ø 200 mm 2 sets of soft top jaws Coolant system Chip blow gun 6 machine feet Operating manual The machine is in very good condition!

Year of construction: 1990, condition: ready for operation (used), A CNC lathe Gildemeister is available. Swing diameter over bed/face slide: 600mm/360mm, bed dimensions X/Y: 350mm/450mm, carriage length: 620mm, carriage width: 250mm, facing travel: 1100mm, chuck diameter: 315mm, spindle bore: 107mm, spindle diameter: 140mm, spindle power: 30kW, torque: 950Nm, speed: 3150rpm, rapid traverse X/Z: 10m/min/5m/min. Quill diameter: 100mm, quill stroke: 180mm, max. tailstock pressure: 1200daN, turning length: 1000mm. Machine dimensions X/Y/Z: approx. 4350mm/2050mm/2000mm, weight: approx. 6400kg, operating hours: 49811h. Documentation available. An on-site inspection is possible. Njdpfx Asx R Duaohkolf

Condition: good (used), Year of construction: 2003, All parts shown by hand not come. Nledpfeyyniaox Ahksf Technical details are shown on picture.

Condition: ready for operation (used), Year of construction: 2002, operating hours: 63,040 h, functionality: fully functional, No minimum price – guaranteed sale to the highest bidder! TECHNICAL DETAILS Machine configuration Upper linear slides: 2 units Milling unit: 1 unit Transverse drilling units: 2 units Rigid front spindle: 1 unit Machining units Drum 6: Movable only in the X-axis Front position 1: Rotationally rigid spindle, movable only forwards and backwards Front positions 2 to 4: Rotationally fully controllable spindles Front position 5: Internal machining axis for processing internal contours and radii Front position 6: Driven indexing spindle with rear machining slide and two tools, movable towards the viewing side Full electronic equipment Electronically connectable auxiliary drives on the front positions and six drum slides MACHINE DETAILS Nedpozrgnpefx Ahkolf Operating hours: 98,119 h Spindle hours: 63,040 h EQUIPMENT Chip conveyor High-pressure coolant unit Bar loader Milling unit Two transverse drilling units Collets Spare parts Electronic components for the control cabinet New rigid front spindle

Condition: ready for operation (used), Year of construction: 2005, operating hours: 19,229 h, functionality: fully functional, machine/vehicle number: 8043943123C, turning length: 1,050 mm, turning diameter: 465 mm, travel distance X-axis: 300 mm, travel distance Z-axis: 1,050 mm, controller model: Siemens 840 D, TECHNICAL DETAILS Turning diameter: 465 mm Turning length: 1,050 mm Swing diameter: 680 mm Chuck diameter: 325 mm X-axis travel: 300 mm Z-axis travel: 1,050 mm Spindle speed range: 3,500 rpm Rapid traverse X/Z: 30 m/min MACHINE DETAILS Control: Siemens 840 D Number of tool positions: 12 positions Nsdpey D I Ttofx Ahkslf Tool holder: VDI 40 Weight: 7,500 kg Operating hours Spindle hours: 19,229 h Power-on hours: 81,347 h Note: The machine can be inspected under power upon request.

Condition: used, Year of construction: 2006, Technical details: turning diameter over bed: 500 mm turning dia. over face-slide: 290 mm turning length: 850 mm centre distance: 850 mm longitudinal traverse (z-axis): 900 mm facing movement (x-axis): 260 mm control: Manuaplus 4110 revolution per minute: 10 - 3000 / 2x seples U/min max. torque on the spindle: 920 Nm spindle bore: 70 mm facing movement (x-axis): 8 m/min. longitudinal traverse (z-axis): 10 m/min. operating hours - idle run: ca. 34.600 h tailstock taper ISO: MK 5 tailstock quill stroke: 180 mm total power requirement: 24 kVA Weight approx.: 5,2 t dimension machine xH: 2,2 x 3,2 x 1,9 m Multifix steel holder size C 3-jaw chuck Ø 250mm chip tray manual hour counter live center in tailstock Operation control panel and monitor Accessories: 4-jaw chuck Ø 250mm with internal jaws various chuck keys Njdpfx Ahjwtct Hskelf Machine lighting 8x foot plates 4x wedge lifters various pairs of jaws 1x steady rest Ø 100mm closed *

Year of construction: 1996, condition: ready for operation (used), A cycle-controlled CNC lathe Gildemeister is available. Center distance: 1500mm, max. turning length: 1500mm, swing diameter over bed/cross slide: 500mm/290mm, speed: 2800rpm, spindle bore: 70mm, spindle torque: 1050Nm, travel X/Z: 260mm/1600mm, rapid traverse X/Z: 6m/8m/min, feed rate: 5m/min, feed force: 5kN, tailstock quill stroke: 180mm, tailstock quill diameter: 80mm. Machine dimensions X/Y/Z: approx. 3200mm/1800mm/1900mm, weight: approx. 3100kg, operating hours: 79727h. Documentation available. On-site inspection is possible. Nsdpfex Uq Uhox Ahkjlf