Beli Bcm Meja Pemotong Kaca Bcm bekas (13.547)

Kondisi: bekas, Maximum cutting width: 310 mm Maximum cutting height: 125 mm Saw blade diameter: 500 mm Motor power: 5.5 kW SALVAMAC LEGEND 500 – The Semi-automatic Under-table Cross-cut Saw ----- Maximum cutting area: 220x125 / 260x100 / 285x80 / 310x50 mm. When cutting stacked boards, maximum height: 100 mm. The structure is made entirely of thick-walled, fully reinforced and painted steel. Solid floor mounting system with flanged steel feet for the fixing hole. Two-handed safety cutting control in ergonomic position. Saw motor power: 5.5 kW. Adjustable cutting speed via a pneumatic regulator. Maximum system for weight balance and durability. Shock-absorbing system. Independent pneumatic adjustment options for adaptation to various processing types. Durable and easily replaceable saw blade adjustment bar. Carbide-tipped circular saw blade, diameter 500 mm, Z=108. Pneumatic upper workpiece hold-down with electro-pneumatic control. Press movement system via innovative ball bearings with double dust protection and automatic lubrication system. CE-compliant electrical system. CE models must, as standard, be equipped with at least 1 meter long feed tables/roller conveyors at both the infeed and outfeed sides. Technical Data: ----- Maximum saw cross-section, mm: 220x125, 260x100, 285x80, 310x50 Saw blade motor power: 5.5 kW Saw blade diameter: 500 mm Saw blade type: HM Z=108 Saw blade rotational speed: 2800 rpm Air consumption per cycle: 5 Nl Suction connections: 1 x 120 mm / 1 x 100 mm Air pressure: 6 - 8 bar Voltage: 400V/50 Hz, 3-phase Working table height: 900 mm ± 20 mm Colour: RAL 7035 Machine additionally equipped with: ----- 2 m roller conveyor (right of saw) with non-driven rollers: Painted steel frame with galvanized rollers. Load capacity 230 kg, diameter 60 mm, spacing 250 mm, width 320 mm. The spaces between rollers are enclosed with painted steel. Including side guide. 2 m roller conveyor (left of saw) with non-driven rollers: Painted steel frame with galvanized rollers. Load capacity 230 kg, diameter 60 mm, spacing 250 mm, width 320 mm. The spaces between rollers are enclosed with painted steel. Including side guide, stop guide and millimeter scale. 2 heavy-duty pneumatic stops, width 200 mm ----- Total price ex-works: on request! ----- Image and video not original, show an identical model. Further options such as longer infeed/outfeed, stop systems available on request! Ncodpfev Uq Tlsx Alksr (Technical data according to manufacturer, subject to change!)

Kondisi: perlu perbaikan (bekas), For sale: bean end cutters – exactly as shown in the photos. Price per piece. Ncedpfxowz Ntpe Alker

Kondisi: bekas, Year of manufacture: 1994 Working height: 850 mm Saw blade diameter: 500 mm Cutting speed: 76 m/sec Saw blade flange diameter: 130 mm Nsdpfxjwudifo Alkecr Saw motor power: 5.5 kW Saw motor speed: 2,900 rpm Saw motor insulation class: B Weight approx. 350 kg All technical data and information according to brochure.

Kondisi: bekas, STROMAB TR 500 – Under-table Crosscut Saw with Pneumatic Feed For sale is a STROMAB TR 500 under-table crosscut saw featuring a pneumatic saw blade feed and a blade diameter of 500 mm. This machine is ideally suited for precise and efficient crosscutting of workpieces in workshop environments. Year of manufacture: 2009 Machine number: 3229 ——— Technical Data • Max. cutting width: 360 mm • Cutting height: 135 mm • Saw blade diameter: 500 mm • Infeed roller conveyor length: 1,000 mm • Outfeed roller conveyor length: 1,000 mm • Table height: 850 mm • Main motor: 7.5 kW • Saw blade feed: pneumatic • Conformity marking: CE mark • Weight: approx. 420 kg ——— Condition & Delivery The machine is in excellent technical condition and ready for immediate use. • Inspection possible at any time • Shipping securely packed on pallet via freight forwarder possible at short notice ——— Contact Maschinenhandel Nord Gerstenstraße 2 17034 Neubrandenburg 📞 All prices net plus 19% VAT, subject to changes and errors. Ncsdoxiza Uopfx Alkor

Kondisi: sangat baik (bekas), Fungsionalitas: berfungsi sepenuhnya, Tabel Pemotong M&J 6000-12 Kondisi sangat baik Pisau penyeimbang telah dilas ulang dan dikeraskan sepenuhnya Poros dengan Sistem Bantalan pengaturan 1 Nodpfx Alew Ufhbekecr ✔️ Siap pakai segera Hubungi kami untuk harga dan detail lebih lanjut.

Kondisi: diremaj di bengkel (bekas), - Mesin gergaji potong Paul 15 AO Njdpjw Slgfofx Alkecr - Gerakan potongan gergaji hidraulik - 150 mm tinggi potong - 500 mm lebar potong maksimum - 1 konveyor rol tidak digerakkan sepanjang kira-kira 1.600 mm

Kondisi: baru, Tahun pembuatan: 2024, Undertable Crosscut Saw UTK-600 with vertical front safety shield – pneumatically raise/lowerable including saw blade Manufactured according to the latest PLC safety control in accordance with the new Machinery Directive. Technical Data: - Motor power: 7.5 kW S1 - Max. saw blade diameter: 600 mm - Blade bore: 35 mm - Cutting time per stroke: 4 sec. - Saw spindle speed: 2,800 rpm - Air consumption per cycle: 20 L - Working table height: 900 mm - Extraction outlets: 2x120 mm, 1x100 mm - Operating pressure: 7 – 8 bar - Net weight: approx. 520 kg - Required air flow: 1,000 m³/h - Voltage: 400 V / 50 Hz 3-phase Cutting capacities (in mm): Nedpef Sqy Djfx Alkocr 30 x 800 50 x 765 140 x 600 180 x 340 200 x 200 Standard equipment includes: - Pneumatically driven saw blade feed - *NEW two-hand PLC safety control - Automatic motor brake - Set of operation keys - Emergency stop push button - Speed regulator for saw blade feed - Fixed vertical safety guard - Upper safety pressure device (pneumatic safety hood) - Extraction speed min. 28 m/sec. - Colour scheme: base frame light grey RAL 7035, doors tele grey RAL 7046, safety shield and safety hood zinc yellow RAL 1018

Kondisi: baik (bekas), Fungsionalitas: berfungsi sepenuhnya, LVD Shear Plat MV 31/3.5 – 3100 × 3,5 mm – Gunting Guillotine Produsen: LVD Company, Gullegem (Belgia) Tipe: MV 31/3.5 Nodpfoxmvl Tex Alkscr Panjang potong maks.: 3100 mm Ketebalan plat maks. (baja): 3,5 mm Penggerak: hidrolik Stop belakang: elektrik 750 mm Bobot mesin: sekitar 4000 kg Dimensi: sekitar 4000 × 1800 × 1600 mm LVD guillotine, tipe MV 31/3.5, cocok untuk memotong plat baja hingga tebal 3,5 mm dengan lebar maksimum 3.100 mm.

Kondisi: siap digunakan (bekas), Tahun pembuatan: 2022, nomor mesin/kendaraan: 0-341-73-4415, Fungsionalitas: berfungsi sepenuhnya, jam operasional: 4.522 h, daya: 7,5 kW (10,20 hp), lebar pemotongan (maks.): 3.200 mm, diameter mata gergaji: 310 mm, lubang pisau gergaji: 60 mm, berat keseluruhan: 5.000 kg, en-001 Ncodpfxsy Ai Upo Alkjr

Tahun pembuatan: 2001, Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, gaya punching: 1.000 t, kecepatan operasi: 93 mm/dtk, panjang langkah: 55 mm, panjang meja: 1.100 mm, lebar meja: 800 mm, nomor mesin/kendaraan: 100597, TECHNICAL DETAILS Punching Force: 10,000 kN Table Area (W x D): 1,100 x 800 mm Stroke Range: 15 - 55 mm Clearance at Max. Stroke: 28 - 98 mm Puzzle Thickness: up to 3 mm Format Widths (Max.): 1,100 mm Punching Speeds Upward: 47.8 mm/s Downward: 93.7 mm/s Punching: 0.28 mm/s Hydraulic Unit Type: 250 Dimensions (L x W): 1,310 x 910 mm Oil Capacity: 670 l Unit Weight: 1,000 kg Oil Weight: approx. 550 kg Weight with Oil Filling: approx. 1,550 kg Automatic Punch Table Type: 355 Table Plate Size (W x D x T): 1,000 x 700 x 10 mm Hardness: 62 HRC Grinding Pattern: 7 MACHINE DETAILS Electrical Operating Voltage: 400 V Nedpfsy Ampdox Alkecr Frequency: 50 Hz Rated Current: 50 A Power Supply Fuse: 63 A Control Voltage: 230/24 V Rated Power: approx. 30 kW Protection Class: IP 54 Power Consumption: approx. 8 kW Pneumatics Operating Pressure: 6 bar Dimensions & Weight Puzzle Separator Dimensions (L x W x H): 3,150 x 1,620 x 2,900 mm Working Height: approx. 1,700 mm Total Weight: 33,000 kg Puzzle Separator Weight: approx. 1.8 t Sound Level: < 70 dB(A)

Tahun pembuatan: 2000, Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, lebar kerja: 22 mm, gaya potong: 183 t, panjang kerja: 500 mm, RINCIAN TEKNIS Gaya pemotongan: 1.800 kN Kapasitas untuk material datar: 500 x 22 mm Kapasitas untuk profil persegi: 150 x 150 x 15 mm PERLENGKAPAN Penghitung Njdpjyyb Hrjfx Alkscr Sistem penomoran

Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, Tahun pembuatan: 2005, jam operasional: 108.000 h, daya laser: 4.000 W, ketebalan lembaran (maks.): 6 mm, jarak pergerakan sumbu X: 3.050 mm, jarak lintasan sumbu Y: 1.875 mm, jarak gerak sumbu Z: 380 mm, gaya punching: 30 t, TECHNICAL DETAILS Pressing force: 300 kN Maximum continuous laser power: 4,000 W Travel range punching mode (X / Y axis): 3,050 / 1,875 mm Travel range laser mode (X / Y axis): 2,550 / 1,525 mm Travel range combined mode (X / Y axis): 2,500 / 1,500 mm Laser axis stroke (Z axis): 380 mm Maximum material thickness: 6 mm Ncjdpfx Aljyx Hiijkor Maximum table load: 220 kg Traverse speed (X / Y axis): 100 / 80 m/min Simultaneous axis speed: 128 m/min Positioning accuracy: +/- 0.1 mm Number of turret tool stations: 45 (4 driven) Turret rotation speed: 30 rpm Maximum punching strokes: 780/min Parts chute dimensions: 400 x 1,525 mm Laser gas consumption: 10 l/h Laser wavelength: 10.6 μm Beam divergence: < 2 mrad Number of controlled axes: 7 (X/YP/YL/Z/T/C) MACHINE DETAILS Control model: AMNC-F Resonator: FANUC AF4000E Table type: Brush table Machine frame: Bridge construction Press drive: Servo-electric Drive for turret and table: AC servo motors Display: 14" LCD Storage capacity: 10 MB Flash ROM Drive: 3.5" HD, CD-ROM Interfaces: USB, RS 232, Ethernet Machine weight: 29 t Operating hours: approx. 108,000 h EQUIPMENT Parts chute Air jet vacuum Barcode scanner Wedge leveling elements Sheet deformation sensor “Punch and Forming” Integrated quadruple tapping unit M8 Quick-change nozzle and lens system Automatic focusing system Automatic gas pressure control High-pressure cutting device (CleanCut) Aluminum cutting device (AluCut) Extraction unit Cooling unit

Kondisi: siap digunakan (bekas), Tahun pembuatan: 2015, jam operasional: 2.795 h, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.500 mm, jarak lintasan sumbu Y: 1.500 mm, daya pompa: 2.200 W, Mesin telah direkondisi pada tahun 2026 dan dilakukan perawatan setiap 500 jam operasi! DETAIL TEKNIS Area kerja sumbu X: 1.500 mm Area kerja sumbu Y: 1.500 mm Kapasitas pemotongan baja: 120 mm (disarankan: 60 - 80 mm) Kapasitas pemotongan aluminium: 120 - 200 mm Kapasitas pemotongan plastik, batu, dll: tidak diketahui DETAIL MESIN Daya pompa: 22 kW (30 HP) Perombakan pompa terakhir: 3 jam operasi yang lalu PERLENGKAPAN Nodpsyzz N Aofx Alkscr Suku cadang Komputer Sistem pelunakan air

Kondisi: siap digunakan (bekas), Tahun pembuatan: 2010, Fungsionalitas: berfungsi sepenuhnya, tinggi tumpukan: 200 mm, berat kertas (min.): 36 g/m², berat kertas (maks.): 160 g/m², lebar produk (maks.): 520 mm, diameter rol: 1.370 mm, TECHNICAL DETAILS Unwinder: Maximum production speed: 250 m/min Maximum web width: 520 mm Minimum web width: 150 mm Maximum roll diameter: 1,370 mm Maximum roll weight: 800 kg Slitter: Maximum production speed: 250 m/min Maximum web width: 520 mm Minimum web width: 150 mm Paper thickness: 36 g/m² to 160 g/m² Cutting accuracy: +/- 0.2 mm Stepless format adjustment: 4" - 25" Stepless cutting width adjustment: 5 mm to 80 mm Stack counter/Stacker: Minimum stack length: 100 mm Njdpfxjyzpw Uo Alkocr Maximum stack length: 635 mm Minimum stack width: 115 mm Maximum stack width: 720 mm Minimum stack height: 100 sheets Maximum stack height: 200 mm Maximum production speed: 250 m/min (depending on paper thickness) Paper thickness: 36 g/m² to 160 g/m² MACHINE DETAILS Unwinder: Power supply: 32 A; 400 V, N, PE Compressed air: min. 6 bar (dry) Slitter: Power supply: 32 A; 400 V, N, PE Compressed air: min. 6 bar (dry) Stack counter/Stacker: Power supply: 35 A; 400 V, N, PE Compressed air: min. 6 bar (dry) Folding unit: Power supply: 50 A; 400 V, N, PE EQUIPMENT Electrical documentation Full variability of cutting and residual formats Format and length changes via control panel Longitudinal cuts possible with knife holder Waste extraction possible (extractor not included in the system) Stacks up to two sheets at the same time

Kondisi: siap digunakan (bekas), Tahun pembuatan: 1994, Fungsionalitas: berfungsi sepenuhnya, nomor mesin/kendaraan: 14219, jarak pergerakan sumbu X: 1.250 mm, jarak lintasan sumbu Y: 900 mm, jarak gerak sumbu Z: 560 mm, diameter spindel: 75 mm, kecepatan spindel (maks.): 1.800 rpm, Dengan tampilan digital untuk jalur lintasan! RINCIAN TEKNIS Sumbu X: 1.250 mm Sumbu Y: 900 mm Sumbu Z (atau sumbu W): 560 mm Diameter spindle: 75 mm Kecepatan spindle: 18–1.800 rpm Ncjdpfxoy Emq Te Alker Ukuran meja: 950 mm x 950 mm RINCIAN MESIN Berat: 10.000 kg PERLENGKAPAN Aksesori yang terlihat pada gambar termasuk alat, lemari alat, dan perangkat penjepit.

Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, Tahun pembuatan: 2007, jam operasional: 15.000 h, model controller: BySOFT, daya laser: 2.200 W, jarak pergerakan sumbu X: 1.562 mm, jarak lintasan sumbu Y: 772 mm, jarak gerak sumbu Z: 100 mm, RINCIAN TEKNIS Pergerakan Sumbu X: 1.562 mm Pergerakan Sumbu Y: 772 mm Pergerakan Sumbu Z: 100 mm Kecepatan Rapid X-Y-Z: 100 - 100 m/menit Area Kerja: 1.500 x 3.000 mm RINCIAN MESIN Unit Kontrol: BySOFT Sumber Laser: Bylaser 2200 Daya Laser: 2.200 W Berat: 13.500 kg Nodpfx Aoy D Iklolkscr Jam Operasi: 15.000 jam

Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, Tahun pembuatan: 2001, daya laser: 3.000 W, ketebalan pelat baja (maks.): 20 mm, tebal plat aluminium (maks.): 8 mm, jarak pergerakan sumbu X: 3.000 mm, jarak lintasan sumbu Y: 1.500 mm, jarak gerak sumbu Z: 115 mm, TECHNICAL DETAILS X-axis travel: 3,000 mm Ncodpey D H Ipefx Alkjr Y-axis travel: 1,500 mm Z-axis travel: 115 mm Working area: 3,000 × 1,500 mm Workpiece weight: 710 kg Drive and Control Drive type: TLF 3000 Turbo Laser power: 3,000 W Control unit: Siemens 840D Sheet thickness (steel): 20 mm Sheet thickness (stainless steel): 12 mm Sheet thickness (aluminium): 8 mm MACHINE DETAILS Overall dimensions (L × W × H): 9,800 × 5,300 × 2,000 mm Machine weight: 11,500 kg

Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, Tahun pembuatan: 2005, jam operasional: 19.670 h, model controller: PRIMACH 20L, daya laser: 4.000 W, jarak pergerakan sumbu X: 3.000 mm, jarak lintasan sumbu Y: 1.500 mm, jarak gerak sumbu Z: 150 mm, RINCIAN TEKNIS Perjalanan sumbu X: 3.000 mm Perjalanan sumbu Y: 1.500 mm Perjalanan sumbu Z: 150 mm Area kerja: 3.000 x 1.500 mm Nsdpfey D Icuox Alkecr Sumber laser: CP 4000 Daya laser: 4.000 W DETAIL MESIN Model kontrol: PRIMACH 20L PERLENGKAPAN Sistem ekstraksi asap

Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, Tahun pembuatan: 2004, daya laser: 4.000 W, ketebalan pelat baja (maks.): 22 mm, tebal plat aluminium (maks.): 9 mm, jarak pergerakan sumbu X: 3.420 mm, jarak lintasan sumbu Y: 1.550 mm, Mesin pemotong laser CO2 dengan penukar palet, sistem pemuatan/pembongkaran, dan gudang lembaran logam DETAIL TEKNIS Lintasan X: 3.420 mm Lintasan Y: 1.550 mm Lintasan Z: 200 mm Area kerja: 3.070 x 1.550 x 200 mm Daya laser: 4000 W Ketebalan potong Baja / Inox / Alu: 22 / 12 / 9 mm Kapasitas meja: 920 kg Nsdpfx Aley D Izqjkjcr Kecepatan gerak X/Y/Z: 80 / 80 / 60 m/menit DETAIL MESIN Unit kontrol: Fanuc 160 iLB Berat mesin: 15.500 kg PERLENGKAPAN Menara penyimpanan ganda LKI UL300FO TWIN tahun 2004 Unit hisap dan filter Torit Unit pendingin MTA 201

Tahun pembuatan: 2008, Kondisi: siap digunakan (bekas), Fungsionalitas: berfungsi sepenuhnya, model controller: E555 Touchscreen, berat keseluruhan: 2.300 kg, panjang pemotongan (maks.): 6.000 mm, diameter mata gergaji: 550 mm, kecepatan rotasi (maks.): 2.800 rpm, RINCIAN TEKNIS Panjang potong (maks.): 6000 mm Diameter pisau: 550 mm Kecepatan putaran pisau: 2800 rpm DETAIL MESIN Kontrol: E555 Layar Sentuh Pasokan udara tekan: 7 bar Ncsdoy Egahspfx Alker Dimensi & Berat Dimensi (P x L x T): 7500 x 1500 x 2000 mm Berat: 2.300 kg

Kondisi: sangat baik (bekas), Tahun pembuatan: 1990, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.600 mm, jarak lintasan sumbu Y: 920 mm, jarak gerak sumbu Z: 950 mm, diameter spindel: 128 mm, model controller: HEIDENHAIN iTNC530, The machine was overhauled and modernized in 2005. In 2025, repairs were carried out, including the following work: - Cleaning of the machine - Overhaul and adjustment of machine geometry - Overhaul of machine functionality - Overhaul of electrical equipment - Overhaul of hydraulics and lubrication - Backlash compensation and drive optimization - Replacement of slideway scrapers - Repair of the telescopic cover - Overhaul of tool cooling system CHOV-K 10 bar - Overhaul of tool changer AVN40 TECHNICAL DETAILS Main spindle diameter: 128.57 mm Taper: 50 ISO Spindle speed range: 5,000 rpm Travel X-axis: 1,600 mm Ncedjy Edl Uspfx Alkor Travel Y-axis: 920 mm Travel Z-axis: 950 mm Clamping surface: 850 x 850 mm (850 x 1,600 mm including additional supports) Table load capacity: 3,000 kg MACHINE DETAILS Control: HEIDENHAIN iTNC530 EQUIPMENT - Handwheel - SIEMENS motors and drives - CNC table – full B-axis control - CHOV-K 10 bar – through-spindle coolant system – emulsion - ATC40 – automatic tool changer - Operator enclosure for chip and coolant protection - Workpiece enclosure

Kondisi: siap digunakan (bekas), Tahun pembuatan: 1983, jam operasional: 8.529 h, Fungsionalitas: berfungsi sepenuhnya, jarak pergerakan sumbu X: 1.200 mm, jarak lintasan sumbu Y: 1.120 mm, jarak gerak sumbu Z: 950 mm, beban meja: 3.000 kg, diameter spindel: 100 mm, Mesin telah dimodernisasi dan direkondisi pada tahun 2002! DETAIL TEKNIS Diameter spindel kerja: 100 mm Rentang putaran spindel: 1.800 rpm Kerucut penjepit: ISO 50 Rentang putaran spindel: 1.800 rpm Stroke spindel (W): 630 mm Perjalanan sumbu X: 1.200 mm Perjalanan sumbu Y: 1.120 mm Perjalanan sumbu Z: 950 mm Area penjepitan meja: 1.000 mm x 1.120 mm Kapasitas beban meja: 3.000 kg DETAIL MESIN Sistem kontrol: HEIDENHAIN TNC426 Motor dan penggerak: SIEMENS Jam kerja (dari tampilan): Jam nyala kontrol: 37.038 jam Waktu operasi mesin: 30.987 jam Waktu siklus program: 8.529 jam Waktu kerja spindel: 12.156 jam Ncsdpfxoy Edgfs Alkjr PERLENGKAPAN Handwheel: HR410

Kondisi: baru, Tahun pembuatan: 2025, de Njdpjhv U U Defx Alkecr

Tahun pembuatan: 2023, Kondisi: baru, Fungsionalitas: berfungsi sepenuhnya, de Ncedsyz Hzqspfx Alker

Kondisi: baru, Tahun pembuatan: 2025, Einstiegsmodell Faserlaser-Blechschneidemaschine Niedrige Laserschneidekosten und einfache Bedienung Der modulare Schneidtisch mit Versteifungen spart Zeit beim Zerlegen und verbessert Komfort und Steifigkeit. Die spezielle Faserlaserdüse und der Schneidprozess ermöglichen ein schnelleres Sauerstoffschneiden von Kohlenstoffstahl, gas- und kostensparendes Niederdruck-Stickstoffschneiden von Edelstahl sowie ein hochwertiges Luftschneiden bei Kohlenstoffstahl. Faserlaserschneidköpfe erkennen hervorstehende Hindernisse, um die Schadensrate effektiv zu senken und die Wartungskosten des Laserschneiders zu sparen. Nsdpfshv U Swsx Alkecr Materialien: Metall Zustand: Neu Lasertyp: Faserlaser Laserleistung: 1000W, 1500W, 2000W, 3000W Schneidbereich: 4000 x 1524 mm Schneidgeschwindigkeit: 0–100 m/min Positioniergenauigkeit: ±0,05 mm Wiederholgenauigkeit: ±0,03 mm Unterstützte Grafikformate: AI, BMP, DST, DWG, DXF, DXP, LAS, PLT CNC-Steuerung: Ja Kühlung: Wasserkühlung