Beli Friderich Deckel Gk 12 bekas (23.506)

Kondisi: bekas, Fungsionalitas: berfungsi sepenuhnya, 1 unit bekas: Mesin Gravir Pantograf Universal • Model: Fridrich Deckel GK 12 • Penggunaan: Ukiran halus, copy milling, pembuatan model • Area kerja (benda kerja): sekitar 200 x 350 mm • Area template salin: sekitar 320 x 450 mm • Pembesaran/Pengecilan: 1:1,5 hingga 1:10 • Tahun pembuatan: tidak diketahui • Motor spindle: sekitar 250 W • Kecepatan spindle: Beberapa tingkat, variabel • Kondisi: Bekas, diuji, berfungsi penuh Nledpfx Aoxa Ap Ejfvsf

Kondisi: baik (bekas), Tahun pembuatan: 1980, Mesin Gravir dan Mesin Milling Penyalin Pabrikan: DECKEL Tipe: GK 21 Tahun: sekitar 1980 Diameter Mata Milling Maksimum: 10 mm Kecepatan Spindel: 475 - 20.000 rpm Lintasan kerja: 160 mm Y, 300 mm Z, 365 mm Njdsvk D A Eopfx Afvolf Meja: 200 mm X 360 mm Lemari mesin lengkap dengan banyak aksesori dan dokumentasi mesin tersedia. Berat: 620 kg.

Kondisi: baik (bekas), nomor mesin/kendaraan: 16526, Model table size: 320 x 440 mm Working table size: 200 x 300 mm Longitudinal travel: 250 mm Transverse travel: 220 mm Spindle speeds: 1,460 - 8,550 rpm Milling ratio: at 1 : 1 approx. 105 x 165 mm Spindle drive: 0.86 kW Nodpodlkwgsfx Afvjlf Required space: 1,000 x 900 x 1,320 mm Weight: 360 kg

Kondisi: perlu perbaikan (bekas), Tahun pembuatan: 1989, Fungsionalitas: tidak berfungsi, Michael Deckel S 12 M mesin pengasah alat. Mesin mengalami masalah listrik, ada kesalahan di layar. Selain itu dalam kondisi baik. Aksesori: dudukan batu gerinda, manual pengoperasian. Nsdpfxjx Nclue Afvelf

Kondisi: siap digunakan (bekas), Penutup panel kontrol / keyboard Grundig Dialog 12 Maho untuk FP4-60, bekas, kondisi terawat dengan baik, 100% berfungsi, pengiriman sesuai foto Nlodey Nqa Hspfx Afvof

Kondisi: bekas, berat muatan maksimum: 6.150 kg, berat keseluruhan: 12.000 kg, konfigurasi gandar: 2 gandar, pendaftaran pertama: 10/2008, panjang ruang muatan: 6.500 mm, lebar ruang muat: 2.240 mm, tinggi ruang muatan: 500 mm, Perlengkapan: ABS,

Kondisi: bekas, Tahun pembuatan: 1997, jam operasional: 32.000 h, tinggi total: 2.700 mm, panjang total: 5.500 mm, lebar total: 2.500 mm, Color: White Unladen weight: 13,000 kg - Year of manufacture: 1997 - Documentation available: Yes - CE marking present: Yes - CE certificate available: No - Serial number: 120245 - Operating hours: 32,000 - Control type: CNC - Horizontal/Vertical: Horizontal and Vertical - Control system brand: Heidenhain - Number of axes [pcs.]: 5 - X-axis travel [mm]: 1200 - Y-axis travel [mm]: 880 - Z-axis travel [mm]: 800 - C-axis rotation [°]: 360 - Table length [mm]: 1250 - Table width [mm]: 1000 - Tool holder: SK40 - Max. spindle speed [rpm]: 18,000 - Options: Digital display, tool magazine Nsdpfx Asy Uv U Hsfvolf - └ Type of digital display: Heidenhain - └ Tool magazine [pcs.]: 30 - Transport dimensions: 5500 mm x 2500 mm x 2700 mm (L x W x H) - Transport weight [kg]: 13,000 kg - Number of transport packages [pcs.]: 1 Financial Information VAT: The stated price is exclusive of VAT VAT/margin taxation: VAT deductible for businesses Delivery and trade-in possible at any time for all industrial sector equipment Lukas van Rossum

Kondisi: bekas, Tahun pembuatan: 1999, Technical details: X-axis travel: 1250 mm Y-axis travel: 880 mm Z-axis travel: 800 mm CNC control: Heidenhain TNC 430 Tool changer: 60 positions Tool holder: SK 50 Spindle speed: 8000 rpm Pallet size: 1000 x 800 mm Total power requirement: 56 kVA Machine weight approx.: 14.3 t Space requirements approx.: 5.5 x 3 x 3.1 m 5-axis machine with servo-controlled universal milling head as B-axis Double pallet changer incl. 2 pallets 1000 x 800 mm Production package, comprising: - Through-spindle coolant system (IKZ) with 40 bar operating pressure, 900 l coolant tank (2.25 x 1.3 x 2.2 m / 950 kg) - Chip conveyor (4.85 x 1.2 x 1.75 m / 600 kg) - Rotating viewing window - 3D probe RENISHAW MP 10 - Electronic handwheel - Mechanical tool breakage monitoring Accessories (SK 50 tool holders) Approx. 100,200 operating hours, approx. 52,500 spindle hours, last spindle replacement in 2020 Nledotq Nlcepfx Afvjf

Kondisi: sangat baik (bekas), Tahun pembuatan: 1999, Pengontrol Heidenhain TNC 426 Rentang gerakan X/Y/Z: 1250 x 880 x 800 mm Kecepatan putar 8.000 putaran/menit Majalah perkakas untuk 60 perkakas, tipe SK 50 Kepala frais universal +0° / -90° Nlsdpfx Ajzqv A Tefvef Meja putar NC 1250 x 1000 mm Konveyor serpihan Probe pengukuran

Kondisi: sangat baik (bekas), Tahun pembuatan: 1999, x-travel 1,250 mm y-travel 880 mm Njdsgypabepfx Afvjlf z-travel 800 mm Main spindle: Speed range - main spindle max. 12,000 rpm Drive power - main spindle 15 / 10 kW Table clamping surface 1,500 x 1,050 mm Number of tool stations 30 positions.

Kondisi: sangat baik (bekas), Tahun pembuatan: 2006, nomor mesin/kendaraan: 11460000643, Fungsionalitas: berfungsi sepenuhnya, jam operasional: 35.319 h, tegangan masuk: 400 V, jenis arus masuk: tiga fasa, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 1.000 mm, jarak gerak sumbu Z: 10.000 mm, kecepatan spindel (maks.): 10.000 rpm, kecepatan spindel (min.): 10 rpm, 5-axis machining centre, Manufacturer: DECKEL MAHO, Model: DMU 125 P duoBLOCK, Year of manufacture: 2006, Recorded operating hours (h): 35,319, Serial No.: 11460000643, Travel paths (X/Y/Z): 1,250/1,000/1,000 mm, Max. spindle speed: 10,000 rpm, 60-position tool changer, B-axis, swivelling 190°, HEIDENHAIN Mill Plus control, internal coolant supply, tool measuring system, chip conveyor, DMG filter system, Serial No.: 13812-01560, DMG WK331 cooler unit Nloderkz Tfjpfx Afvof

Kondisi: bekas, OFFER We can offer you, subject to prior sale and errors, from stock, without obligation: DECKEL MAHO CNC Universal Milling Machine Model: DMU 50 M Year of manufacture: 1998 ----- Working range: Nsdpfov Td Elsx Afvolf Longitudinal travel X-axis 500 mm Vertical travel Z-axis 400 mm Cross travel Y-axis 400 mm C-axis – Table rotation, manual 360° B-axis – Table tilt, manual ° Table dimensions Ø 700 x 500 mm Swivel range of table ° Table rotatability 360° Maximum workpiece weight 200 kg Installation height between table and spindle approx. 550 mm Reach between machine base and spindle min./max. 2 – 6 mm Tool holder SK 40 Spindle speeds infinitely programmable 20 – 4,500 rpm Feed rates / rapid traverse max. 5,000 mm/min AC main drive 0%/40% duty cycle approx. 9 / 13 kW Total power approx. 15 kW - 400 V - 50 Hz Weight approx. 3,000 kg Accessories / Special equipment: • 3-axis path control HEIDENHAIN TNC 124 with display and direct input of all data, with electronic handwheels for all three axes. • All three axes integrated into the milling head, so even "irregular" workpieces can be machined on the fixed table. • Rotary table manually rotatable 360°, manually tiltable +/-° (each with clamping). Digital readout of tilt angles integrated into the control unit. • Basic coolant system, attached control cabinet (SIEMENS components). • Pneumatic tool clamping, various tool holders, operating manuals, CE certificate, etc. Condition: Good to very good condition! Ideal for training purposes or single-part production! Please click here for a video of the machine: Delivery: from stock, immediately available, FCA Metzingen Payment: strictly net – upon receipt of invoice Always a large selection of milling machines in stock – please inquire about your requirements!

Kondisi: bekas, Glass scale, glass measuring scale, scale, digital display, measuring scale, linear measuring system, length measuring device, linear scale, position indicator, digital scales, digital scale for digital display -Manufacturer: Heidenhain, glass scale removed from Deckel FP4L milling machine Nlsdpfx Afsuuu H Eevsf -Type: LS 803 ML 1240 mm -Quantity: 1x glass scale available -Dimensions: 1345/200/H50 mm -Weight: 1.2 kg

Kondisi: bekas, Tahun pembuatan: 1998, Fungsionalitas: berfungsi sepenuhnya, DECKEL MAHO - DMU 125 T Detail Penawaran Nomor Stok: 1039-8700 Jenis Mesin: Pusat Pemesinan - Vertikal Produsen: DECKEL MAHO Tipe: DMU 125 T Nlodpfxszfzhdj Afvof Tahun Pembuatan: 1998 Kontrol: TNC 426 Heidenhain Lokasi Gudang: D-59302 Oelde Negara Asal: Jerman Waktu Pengiriman: menurut kesepakatan Basis Pengiriman: ex lokasi Informasi Tambahan: Pusat Pemesinan CNC - Vertikal DECKEL MAHO - DMU 125 T - Pendingin Tekanan Tinggi (IKZ) Detail Teknis Sumbu X: 1.250 mm Sumbu Y: 880 mm Sumbu Z: 800 mm Kontrol: TNC 426 Heidenhain Spindel Utama: Rentang Putaran Spindel Utama: maks. 12.000 rpm Daya Penggerak Spindel Utama: 15 / 10 kW Torsi Maksimum: 500 Nm Taper Spindel: SK 40 Meja Kerja: Area Pemasangan Meja: 1.500 x 1.050 mm Beban Maksimal Meja: 2.500 kg Jumlah Slot T: 10 Lebar Slot T: 18 H7 mm Jarak Slot T: 100 mm Penukar Alat: Jumlah Tempat Alat: 30 posisi Diameter Maksimum Alat: 80 mm Diameter Maksimum Alat dengan Slot Kosong di Samping: 160 mm Panjang Maksimum Alat: 315 mm Berat Maksimum Alat: 8 kg Berat Total Maksimum: 100 kg Kecepatan Pergerakan: Kecepatan Rapid Traverse (X / Y / Z): 15 m/menit Kecepatan Feedrate: 10.000 mm/menit Kebutuhan Daya Total: 29 kW Berat Mesin: sekitar 16,0 t Dimensi (PxLxT): sekitar 7,0 x 5,0 x 3,3 m Aksesori Dokumentasi Konveyor Serpihan (Chip Conveyor) Perangkat Pendinginan Pendingin Tekanan Tinggi Pendingin Internal Penukar Alat Probe Pengukuran Heidenhain Handwheel Elektrik

Kondisi: bekas, Tahun pembuatan: 1999, Fungsionalitas: berfungsi sepenuhnya, DECKEL MAHO - DMU 125 T Rincian Penawaran Nomor Gudang: 1039-8230 Jenis Mesin: Pusat Pemesinan - Vertikal Pabrikan: DECKEL MAHO Tipe: DMU 125 T Tahun Pembuatan: 1999 Sistem Kontrol: TNC 430 Heidenhain Lokasi Gudang: D-59302 Oelde Negara Asal: Jerman Waktu Pengiriman: berdasarkan kesepakatan Basis Pengiriman: ex lokasi Informasi Tambahan: Pusat Pemesinan CNC - Vertikal DECKEL MAHO - DMU 125 T Rincian Teknis Sumbu X: 1.250 mm Sumbu Y: 880 mm Sumbu Z: 800 mm Sistem Kontrol: TNC 430 Heidenhain Spindel Utama: Rentang Putaran Spindel Utama: maks. 12.000 rpm Daya Penggerak Spindel Utama: 15 / 10 kW Torsi Maksimum: 500 Nm Konektor Tool: SK 40 Meja Kerja: Dimensi Meja: 1.500 x 1.050 mm Kapasitas Beban Meja Maks.: 2.500 kg Jumlah Alur-T: 10 Lebar Alur-T: 18 H7 mm Jarak Antar Alur-T: 100 mm Penukar Alat Otomatis: Jumlah Posisi Alat: 60 posisi Diameter Maks. Alat: 80 mm Diameter Maks. Alat (slot kosong di samping): 160 mm Panjang Maks. Alat: 315 mm Berat Maks. Alat: 8 kg Berat Total Maks.: 100 kg Feedrate: Kecepatan Rapid (X / Y / Z): 15 m/menit Kecepatan Feed: 10.000 mm/menit Kebutuhan Daya Total: 29 kW Berat Mesin Sekitar: 16,0 t Nljdpezfzgtjfx Afvsf Dimensi Luar Sekitar: 7,0 x 5,0 x 3,3 m Aksesori Dokumentasi Konveyor Serpihan Unit Pendingin Penukar Alat Otomatis

Kondisi: baik (bekas), Tahun pembuatan: 1982, x-Perjalanan 300 mm y-Perjalanan 160 mm z-Perjalanan 340 mm Penjepit alat SK40 Kecepatan putar 40–2000 rpm Kontrol Aktiv HEIDENHAIN Nodpozfql Sofx Afvolf Ukuran meja 600 x 210 mm Kebutuhan daya total 2 kW Berat mesin sekitar 0,73 t Kebutuhan ruang sekitar PLS 1,20x1,10x1,60 m Berasal dari sekolah kejuruan - Feed aktif pada sumbu X dan Z, sumbu Y - Perangkat pendingin - Ragum - Lampu kerja

Kondisi: bekas, Tahun pembuatan: 1999, sumbu x 1.250 mm sumbu y 880 mm sumbu z 800 mm Kontrol TNC 430 Heidenhain Kecepatan putar spindle utama maks. 12.000 rpm Daya penggerak spindle utama 15 / 10 kW Torsi maksimum 500 Nm Konektor alat SK 40 Permukaan penjepitan meja 1.500 x 1.050 mm Beban maksimum meja 2.500 kg Jumlah alur T 10 Alur T - lebar 18 H7 mm Alur T - jarak 100 mm Jumlah posisi alat 60 pos. Diameter alat maksimum 80 mm Nlsdpfx Afezfqgvevof Diameter alat maksimum jika kotak alat samping kosong 160 mm Panjang alat maksimum 315 mm Berat maksimum alat 8 kg Berat total maksimum 100 kg Kecepatan rapid (X / Y / Z) 15 m/menit Kecepatan feeding 10.000 mm/menit Kebutuhan daya total 29 kW Berat mesin sekitar 16,0 t Dimensi ruang sekitar 7,0 x 5,0 x 3,3 m Pusat Pemesinan CNC Vertikal DECKEL MAHO - DMU 125 T

Kondisi: bekas, Tahun pembuatan: 1998, x-Perjalanan 1.250 mm y-Perjalanan 880 mm z-Perjalanan 800 mm Kontrol TNC 426 Heidenhain Rentang putaran spindle utama maks. 12.000 rpm Nljdezfqgpspfx Afvsf Daya utama spindle 15 / 10 kW Torsi maksimum 500 Nm Taper tool SK 40 Ukuran meja kerja 1.500 x 1.050 mm Kapasitas beban meja maks. 2.500 kg Jumlah alur-T 10 Lebar alur-T 18 H7 mm Jarak antar alur-T 100 mm Jumlah posisi alat 30 Diameter alat maks. 80 mm Diameter alat maks. dengan kotak tetangga kosong 160 mm Panjang alat maks. 315 mm Berat alat maks. 8 kg Berat total maks. 100 kg Kecepatan rapid (X / Y / Z) 15 m/menit Kecepatan makan 10.000 mm/menit Kebutuhan daya total 29 kW Berat mesin sekitar 16,0 t Ukuran ruang sekitar 7,0 x 5,0 x 3,3 m Pusat pemesinan CNC vertikal DECKEL MAHO - DMU 125 T - Pendingin internal alat (IKZ)

Kondisi: bekas, Tahun pembuatan: 2006, dmu80_monoblock_spec Nodpfx Afeyackdevslf

Kondisi: sangat baik (bekas), Tahun pembuatan: 2016, Fungsionalitas: berfungsi sepenuhnya, 1x tangki baja, kotak baja, kotak, peti, wadah, kotak logam dengan tutup Tersedia 32 unit Ukuran 120x100x77 cm dengan tutup galvanis celup panas lantai tertutup sepenuhnya, kedap Nljdpfx Aszckfnofvef Kondisi sangat baik, lihat foto. Forklift tersedia untuk pemuatan. Pengambilan hanya dengan perjanjian di 75053 Gondelsheim Pengiriman melalui ekspedisi memungkinkan, silakan tanyakan dengan kode pos.

Kondisi: bekas, Tahun pembuatan: 2009, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 1.000 mm, jarak gerak sumbu Z: 1.000 mm, Offered here is a used machining center from the manufacturer Deckel Maho DMG. The machine is connected to power and can be inspected in our facility. Free loaded onto truck (FCA) Manufacturer: DMG Deckel Maho Type: DMC 125 H duoBlock Year of manufacture: 2009 Control: Siemens 840 D Solutionline (PCU 50) Technical specifications: Travel X-, Y-, Z-axis: 1250x1000x1000 mm Feed rate X-, Y-, Z-axis: 20 - 60,000 mm/min Rapid traverse X-, Y-, Z-axis: 60 m/min B-axis travel: 360x0.001° B-axis feed rate: 10,800 °/min Max. rotation speed of table: 30 rpm Spindle speed: 20 - 8,000 rpm Gear ranges: 2 Max. workpiece diameter: 1,250 mm Max. workpiece height: 1,580 mm Clamping area: 800x800 mm Max. workpiece weight: 1,500 kg Pallet weight: 570 kg Max. permissible weight difference for pallet loading: 1,000 kg Tool holder: SK 50 according to DIN 69871 Maximum tool length: 650 mm Tool magazine: 120 positions Transport dimensions: 6,500x3,000x3,200 mm Transport weight of machine (without magazine or additional equipment): approx. 20,000 kg Required space: approx. 7,000x6,000 mm Total machine weight: 24,000 kg Accessories: Chip conveyor with coolant tank Coolant system 4x machine pallets Tool magazine Oil mist extraction unit Various new spare parts: 1x length measuring system Y-axis (new) 1x lubrication unit 230V 0.12 30bar (new) 1x gear pump unit ZAHNRADP-AGG*MKF1-KW2-20036 (new) 1x Cyclo gearbox F1C-A25 (new) Nsdpfsw Ew T Sjx Afvjlf 1x upgrade kit power module (new) 1x lifting equipment for the machine

Kondisi: siap digunakan (bekas), Tahun pembuatan: 1998, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 880 mm, jarak gerak sumbu Z: 800 mm, model controller: TNC 426 Heidenhain, kecepatan spindel (maks.): 12.000 rpm, TECHNICAL DETAILS Travel X-axis travel: 1,250 mm Y-axis travel: 880 mm Z-axis travel: 800 mm Main Spindle Maximum speed: 12,000 rpm Drive power: 15 / 10 kW Maximum torque: 500 Nm Tool holder: SK 40 Work Table Clamping surface: 1,500 x 1,050 mm Maximum table load: 2,500 kg Number of T-slots: 10 T-slot width: 18 H7 mm T-slot spacing: 100 mm Tool Changer Number of tool stations: 30 Maximum tool diameter: 80 mm Maximum tool diameter with free adjacent station: 160 mm Maximum tool length: 315 mm Maximum tool weight: 8 kg Total maximum tool weight: 100 kg Feeds Rapid traverse (X / Y / Z axis): 15 m/min Feed rate: 10,000 mm/min MACHINE DETAILS Nljdpfx Aoyxmmnofvsf CNC control model: TNC 430 Heidenhain Total power requirement: 29 kW Dimensions & Weight Space requirements: approx. 7.0 x 5.0 x 3.3 m Machine weight: approx. 16.0 t Transport dimensions: 4.00 x 3.08 m EQUIPMENT Documentation Chip conveyor Coolant system High-pressure coolant Measuring probe (manufacturer: Heidenhain) Internal coolant supply Note: The transport rigging must be organized by the buyer!

Kondisi: siap digunakan (bekas), Tahun pembuatan: 1999, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 880 mm, jarak gerak sumbu Z: 800 mm, model controller: TNC 430 Heidenhain, kecepatan spindel (maks.): 12.000 rpm, TECHNICAL DETAILS Travel X-axis: 1,250 mm Travel Y-axis: 880 mm Travel Z-axis: 800 mm Main spindle Max. speed range: 12,000 rpm Drive power: 15 / 10 kW Max. torque: 500 Nm Tool holder: SK 40 Worktable Clamping surface: 1,500 x 1,050 mm Max. table load: 2,500 kg Number of T-slots: 10 T-slot width: 18 H7 mm T-slot pitch: 100 mm Tool changer Number of tool stations: 60 Max. tool diameter: 80 mm Max. tool diameter with adjacent pockets empty: 160 mm Max. tool length: 315 mm Max. tool weight: 8 kg Max. total tool weight: 100 kg Feeds Rapid traverse (X / Y / Z axis): 15 m/min Feed rate: 10,000 mm/min MACHINE DETAILS Control model: TNC 430 Heidenhain Nsdpfx Afjyxmd Tevjlf Total connected load: 29 kW Dimensions & Weight Space requirements: approx. 7.0 x 5.0 x 3.3 m Machine weight: approx. 16.0 t EQUIPMENT Documentation Chip conveyor Coolant system Tool changer Note: The transport rigging must be organized by the buyer!

Kondisi: sangat baik (bekas), Tahun pembuatan: 2002, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 500 mm, jarak lintasan sumbu Y: 400 mm, jarak gerak sumbu Z: 400 mm, kecepatan spindel (maks.): 4.500 rpm, kecepatan spindel (min.): 50 rpm, For sale is a machining center of the brand Deckel Maho, model DMU 50 M, equipped with CNC control and manual rotary axes. The machine is in very good condition, fully functional, and immediately ready for operation. A special feature is the option to operate it in an open enclosure. Technical specifications: Year of manufacture: 2002 Control: Heidenhain TNC 124 X-axis: 500 mm Y-axis: 400 mm Z-axis: 400 mm Feed rate: 5,000 mm/min Rapid traverse: 5 m/min Tool holder: SK 40 Clamping surface: Ø 700 x 500 mm Rotary range: 360° (mechanical) Swivel range: +90/-15° (mechanical) Max. load: 200 kg Required space: 4,000 x 3,500 x 2,518 mm Transport dimensions: approx. 2,500 x 1,520 x 2,200 mm Weight: 2,600 kg Additional tool holders available on request. Transport and loading can be arranged at extra cost, Europe-wide. Nlsdpfju Unh Iex Afvsf Prices are subject to VAT. Inspection by appointment is possible. Contact us — our team is happy to assist you. Trade-in or exchange possible! Machine purchase and sales BUYING / SELLING PRODUCTION & METALWORKING MACHINES AND MORE. Are you looking for a high-quality but affordable metalworking machine for your production? Or do you want to sell yours? For more information or contact options, please visit our website.

Kondisi: siap digunakan (bekas), Tahun pembuatan: 1999, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 880 mm, jarak gerak sumbu Z: 800 mm, kecepatan spindel (maks.): 12.000 rpm, jumlah slot dalam magazin alat: 60, en Nlsdpfxjxbz Sns Afvjf