Used Chambon 1986 Chambon 168 Rd for sale (6,055)

Condition: new, bore capacity in steel (diameter) 50,0 mm arm length 320 - 1.220 mm workpiece height max. 330 - 1.170 mm turning speeds 25 - 2000 U/min spindle taper MT 5 MK base plate 1300 x 980 mm threading 42 M quill stroke 335 mm total power requirement 4,0 kW weight of the machine ca. 3000 kg. range L-W-H 2035 x 1000 x 2830 mm Furnishing: - Large-sized base plate, ideal for processing large workpieces - Thick-walled, polished column for increased sliding properties of the boom - Extension arm and drill head with independent hydraulic clamping - Simple height adjustment of the extension arm using a lifting motor - Ideal for drilling, countersinking, reaming and thread cutting - Hardened and ground gears, running in an oil bath - Good gliding ability of the drill head on the boom - sanded surface Scope of delivery: - Cube table - Drill chuck arbor MK 5 / B 16 - Reducing sleeves MK 5/4, MK 4/3, MK3 / 2 - LED machine light - First filling with Shell Tellus 46 - coolant device Bledpoxaaabefx Am Tjk - lifting motor - hydraulic motor - operating tool - Height-adjustable protective cover

Condition: excellent (used), mileage: 104,242 km, first registration: 04/2018, fuel type: diesel, axle configuration: 8x4, wheelbase: 3,900 mm, fuel: diesel, fuel tank capacity: 500 l, brakes: engine braking, color: blue, driver cabin: day cab, gearing type: automatic, emission class: euro6, Year of construction: 2018, Equipment: ABS, AdBlue, air conditioning, central locking, cruise control, electric window regulation, fog lights, navigation system, power mirror, soot filter, spoiler, trailer coupling, = Additional Options and Accessories = - Aluminum fuel tank - Brake booster - Low noise - Speed limiter - LED lights - Air suspension - Air horn - Particulate filter - Radio/cassette player - Reversing camera - Sun visor - Stability control - Toolbox - Power take-off (PTO) - Centralized lubrication - Towing jaw = Further Information = Technical Information Number of cylinders: 6 Engine displacement: 12,809 cc Unladen weight: 23,000 kg Axle configuration Front axle: Steering Rear axle 1: Twin wheels Rear axle 2: Twin wheels Rear axle 3: Lift axle; steering Functional Body manufacturer: RSP ESE 6 RD 8000 Condition Technical condition: very good Visual condition: very good Financial Information Price: On request MERCEDES-BENZ AROCS 3251 8X4 TRIDEM RSP ESE 6 RD 8000 SUCTION EXCAVATOR EURO 6 L PACKAGE 510 HP DRIVE 8X4 TRIDEM LAST AXLE LIFTABLE AND STEERABLE WHEELBASE 390 CM AIR SUSPENSION AROCS CAB WITH AIR CONDITIONING, NAVIGATION, CAMERA DIFFERENTIAL LOCK AUTOMATIC TRANSMISSION TRAILER COUPLING RSP SUCTION EXCAVATOR TYPE: ESE 6 RD 8000 Bodpfeuxvc Dex Am Telk TWIN TURBINES!!! HYDROSTATIC DRIVE WITH REMOTE CONTROL POWER BOOM WITH ROTARY HEAD TANK 8M3 WATER TANK 200L CENTRAL LUBRICATION 2X RADIO REMOTE CONTROL EXTRA HIGH-PRESSURE PUMPING UNIT WITH HOSES AND PISTOL EXTRA AIR OUTLETS AT THE REAR OF THE TRUCK FOR OPERATING AIR TOOLS SUCH AS A HAMMER COMPRESSOR 2,588 HOURS FAN 336 HOURS ALL AVAILABLE MANUALS AND SERVICE BOOKS FOLLOW US ON INSTAGRAM: GEURTSTRUCKS WIR SPRECHEN DEUTSCH HABLAMOS ESPAÑOL WE SPEAK ENGLISH

Condition: used, Year of construction: 2009, Kemper HK 200 RD bowl lift suitable for Kemper President 75-125-150 bowls max. 1000 kg lifting weight lifting height 294cm with President 75 bowl Bsdpfxsiy S Daj Am Telk total height 410cm with President 75 bowl year of build 2009 safety cage pictures BEFORE reconditioning

Condition: used, Year of construction: 1986, Max. punching force: 700 kN Projection: 510 mm Bledpef Nwqdjfx Am Tsk Cuts on the flat steel shears 500 x 18 mm Holes e.g. 30 mm diameter in 20 mm flat iron Assortment of tools is included in the price Weight: 3,000 kg

Condition: good (used), Year of construction: 2019, Nicotra Gebhardt P2M Process Air Fan Direct-drive, clutchless, single-inlet fan Robust industrial designs Durable, easy to maintain High efficiency, quiet operation Customized solutions at a standard price Certified and assured quality according to ISO 9001 Technical data measured according to DIN 24163 Accuracy class 2 according to DIN 24166 Volted casing Robust welded construction Casting positions in 90° increments Customized installation position Central impeller Impeller diameter 500 mm Backward-curved blades Welded Dust-resistant Materials: Coated steel, hot-dip galvanized, stainless steel 1.4307 ATEX: Category 2 and 3; Gas and Dust Manufacturer: Nicotra Gebhardt Flow rate: 8000 m³/h dPt: 1070 Pa Density: 1.2 kg/m³ Tmax: 80 °C n: 1460 rpm n max: 2511 rpm PW: 3.10 kW Ins/Eff = B/total N (13/15): 61/64 ETA opt: 71.8 N actual: 76.4 Motor power: 4 kW Directly flanged drive motor Mains connection: 400 volts 50 Hz Weight: 195 kg Year of manufacture: 2019 Bljdpexl Sr Tjfx Am Tok Find more items - new and used - in our shop! International shipping costs on request!

Condition: good (used), Gebhardt Q2M-P2B6N-PAC RD centrifugal fan 20000 m³/h Gebhardt Q2M-P2B6N-PAC RD Centrifugal fan 20000 m³/h Bledoicav Djpfx Am Tsk 7,50 kW n max: 1782 t max: 250 p: 1,200 Motor Siemens UD 0705/1082878-016-1 400/690 V 50 Hz 7,5 kW 8,6 kW 60 Hz 1160/min Dimensions. Height without motor = 64 cm Height with motor = 95 cm width = 102 cm Depth = 102 cm Weight approx. 280 kg

Condition: new, range L-W-H 1680 x 470 x 1050 mm weight 137 kg 7 St. Internal dimensions of upper drawer 124.5 x 40 x 9.5 cm (WxDxH) Internal dimensions of medium drawers 78 x 40 x 6.5 cm (WxDxH) Inner dimensions of bottom drawer 78 x 40 x 14 cm (WxDxH) Interior dimensions of cabinet on the left including trash can 25 x 42.5 x 71 cm (WxDxH) Interior dimensions of cabinet on the right including shelf 41 x 42.5 x 54 cm (WxDxH) Bjdpfx Aou Imfbom Tolk Maximum loadable weight 500 kg Worktop material wood Material of the drawer handles: aluminum Wheel material PP and PU Housing material metal Packed dimensions 1745 x 520 x 995 mm Packaging weight 136.5 kg

Condition: new, Year of construction: 2026, functionality: fully functional, travel distance X-axis: 1,600 mm, travel distance Y-axis: 800 mm, travel distance Z-axis: 700 mm, rapid traverse X-axis: 15 m/min, rapid traverse Y-axis: 15 m/min, rapid traverse Z-axis: 12 m/min, controller manufacturer: Fanuc oimF plus, overall weight: 150,000 kg, spindle speed (max.): 6,000 rpm, number of slots in tool magazine: 24, Equipment: chip conveyor, BT 50, 6000 rpm Bledpfozc Rkqox Am Tsk Manual gearbox with multiple ranges Machine operating on flat guides

Condition: used, Year of construction: 2007, The Perfecta 168 HTVC + Basa 7 is a robust and efficient machine designed for high-performance cutting and finishing tasks. Manufactured by Perfecta, this model was built in 2007 and is renowned for its durability and precision. The machine supports a format of 1680 mm, making it ideal for a variety of applications, and is currently mounted and located in Germany, ensuring easy accessibility for users in the region. The Perfecta 168 HTVC + Basa 7 features a touchscreen for easy and intuitive programming, enhancing user control and efficiency. Equipped with a monitor screen, it provides clear visual feedback and monitoring of operations. The machine includes an air table made of stainless steel, ensuring smooth material handling and precise cutting. Both left and right side tables are equipped with air functionality and are made of stainless steel, further enhancing material flow and precision. The machine is equipped with safety cells, ensuring operator safety during operation. The stack lift type is a pallet feeder, facilitating efficient material loading and unloading, and the ruettel/jogger type is BASA 7, which ensures effective material alignment and stacking. The Perfecta 168 HTVC + Basa 7 is a reliable choice for industries requiring precision cutting and finishing. Its advanced features and robust construction make it a valuable asset for any professional setting. Format: 1680 mm Equipment: Type: Perfecta 168 HTVC Program with touch screen Monitor Screen Air table (stainless steel) Air table Bodpfx Aevghkljm Tslk Side tables with air (stainless steel): Left & right Safety cells Stack Lift Type: Pallet feeder Jogger Type: BASA 7

Year of construction: 2016, condition: as good as new (ex-display), Axial fan condenser, air ccoler Bodpfxonbff As Am Tjlk Manufacturer: Güntner Model: GCVC RD 035.1/12-42-0007305P Year of c.: 2016 2 fans Volume: 4,6 l Comressed air: 32,5 bar

Condition: as good as new (ex-display), Rotary vane vacuum pump Blsdpfohmbkzjx Am Tok Manufacturer: Busch Type: R5 RD0360A Condition: unused, like new Warranty: 12 months

Condition: ready for operation (used), Year of construction: 2019, total height: 2,797 mm, overall weight: 1,570 kg, This 3-axis ZEISS Contura 7/10/6 RDS was manufactured in 2019 and features a robust motorized CNC drive system with a maximum vector speed of 465 mm/s. It includes the ZEISS RDS-C articulating head and VAST XXT TL3 sensor, capable of scanning speeds up to 150 points/second. Ideal for precise measurements with a maximum workpiece weight of 730 kg. Consider the opportunity to buy this ZEISS Contura 7/10/6 RDS CMM machine. Contact us for more information about this machine. Additional information • Maximum workpiece size: approx. 1344 x 910 x 716 mm • Maximum workpiece weight: 730 kg • Table height: 850 mm • Equipped with vibration damping system • Sensor System: • Articulating head: tilt ±180°, rotation increments 2.5° • Scanning speed: up to 150 points/second • Max. stylus length: 150 mm • Max. stylus weight: 15 g • Min. stylus tip diameter: 0.3 mm • Accuracy (per ISO 10360 standards): • Length measurement error (E₀): 1.7 + L/350 µm (at 18–22°C) • Scanning error (THP): 2.7 µm • Form measurement error (RONt): 1.7 µm • Repeatability (R₀): 1.2 µm • Controller: ZEISS C99L • Software: ZEISS CALYPSO, ZEISS GEAR PRO, ZEISS HOLOS • Control mode: Motorized / CNC • Interface: Ethernet, USB • Performance: • Drive system: Motorized CNC • Travel speed (axes): 0–70 mm/s • Max. vector speed: 465 mm/s • Max. acceleration: 1.85 m/s² • Scanning speed: up to 125 mm/s • Utilities: • Power supply: 100–240V AC (±10%), 50–60 Hz • Max. power consumption: 800 VA • Typical power usage: 200 W • Compressed air: 6–8 bar, pre-cleaned, dry (ISO 8573-1 Class 4) • Air consumption: max. 120 Nl/min • Environmental Conditions: • Operating temperature: 18°C–22°C • Relative humidity: 30–60% (non-condensing) • Compliance & Certifications: Bjdpfx Amjx D Ngfe Tolk • Conforms to EC Machine Directive 2006/42/EC • EMC Directive 2014/30/EU • Quality management: ISO 9001:2008 • Environmental management: ISO 14001:2004 • Accredited ISO / IEC 17025:2005 Dimensions Machine Depth 1975 mm

Condition: new, Year of construction: 2025, Vertical packaging machine specially designed for the cosmetics industry for the production of round bags and for 4-side sealed double chamber bags. The completely round side sealed bags are produced at 2 pieces per cycle. When changing the bag type, time is needed for changeover, which requires technical experience. A dosing pump for creams, fluids, etc., is included and is selected on the basis of customized product requirements, which results in the respective specifications. PLC LCD touch display from Siemens, automatic program-Set-Up, mark sensor, stainless steel (SS304) version including hot printer (production date, etc.). - Specifications: bag sizes: customized; film roll width: max. 320mm; suitable for composite and single-layer aluminium, PE, BOPP and PP films, paper; max. speed of the machine in neutral: 40 cycles/minute (corresponds to 80 round bags or 40 double chamber bags); 220V/2.5kW; 6bar, 0.3m³/min; machine dimensions: L977xW1630xH1566mm; weight: 350kg. Please note that our new prices are often below the usual used prices. Please feel free to inquire and tell us your packaging task. - Usually 30-50 different new machines are available immediately from stock. In addition, we have very short delivery times from approx. 3 weeks for customized machines. Deviations from the sample photo are possible. - All machines are available with full warranty. Bljdpfx Aov Nmyqom Tek

Condition: ready for operation (used), Year of construction: 2004, Features: Rondamat 168 is extremely easy to use and highly versatile. The machine sharpens planing knives, milling tools, and circular saw blades using straight grinding wheels. Shaft diameter: 40 mm Wet grinding Maximum tool diameter: 350 mm Disc diameter: 150 mm Maximum tool length: 240 mm Minimum tooth pitch: 32 mm Maximum tooth pitch: 20 mm Bledpeh Txfdsfx Am Tsk Main motor power: 1.1 kW Total power consumption: 1.5 kW

Condition: ready for operation (used), Year of construction: 2005, Offered is an ILLIG HSA 30 RD - high-performance continuous sealing machine for blister packaging: blister films: PVC, PET APET/PETG, PS, film thickness: 150µm-600µm, lid materials: heat-sealable cardboard, aluminum composite films, Tyvek, sealing area X/Y max. approx. 500mm/300mm, forming depth max. approx. 100mm, 8-18 cycles/minute. Inspection possible by arrangement. Expected to be available June 2026. Bsdpfx Amoylbrks Tolk

Year of construction: 2025, condition: new, Dosing system serial doser for the production of mineral mixtures, FSS, STS, KG 1/2 etc. semimobile unit, dosage, dosificación 4 chambers each about 22 m³, hourly output eff. 720 tons, , Bedpfx Amogpk E De Tolk 900 recipes can be set, direct loading onto Trucks

Condition: excellent (used), CNC Flexible Automatic through-feed ROUTERING, DRILLING and DOWELS INSERTING LINE Min/Max workpieces (panels) width (X axis) with FTT: mm 240 / 3100 Min/Max workpieces (panels) thickness (Z axis) with FTT: mm 12 / 60 Min/Max workpieces (panels) length-depth (Y axis) with FTT: mm 140 /1550 (or 800+800) A) Motorized Roller table "RBO" with 90° conveyoring belts B) Gantry (Portal) CNC (Routering and Drilling) machine "BIESSE" FTT 800 slot A: No. 2 vertical Electro-spindles ISO 30 (Kw 4.5 each) with 2 tool-holder stores 3 places each (tot. 6) slot B: No. 2 predispositions for the installation of other 2 electro-spindles Bledpfxsyhqa Ae Am Tek No. 4 upper drilling units (4x32 = total 128 vertical spindles + 4x4= tot. 16 horizontal spindles in Y-axis) No. 2 drilling spindles stores/magazines (revolver) with 60 positions each (total 120) C) Connection system, with up-side-down turning machine (180°) "RBO" Mod. Ribaltatore D) Gantry (Portal) CNC (Routering and Drilling) machine "BIESSE" Mod. FTT 800 R8 No.2 horizontal units (1 left+1 right) with 4x BH18 heads with 18 spindles each (36 right + 36 left) total 72 slot A: No. 2 vertical Electro-spindles ISO 30 (Kw 4.5 each) with 2 tool-holder stores 3 places each (tot. 6) slot B: No. 2 predispositions for the installation of other 2 electro-spindles No. 4 upper drilling units (4x32 = total 128 vertical spindles + 4x4= tot. 16 horizontal spindles in Y-axis) No. 2 drilling spindles stores/magazines (revolver) with 60 positions each (total 120) E) "BIESSE" RD dowels insertion machine No.2 horizontal units (1 right+1 left) with 5 insertion nozzles each (5 left + 5 right), total 10 nozzles F) Brush-cleaning machine "WANDRES"

Condition: ready for operation (used), MarSurf M300 MarSurf RD 18 Mahr roughness measuring device with evaluation unit Bsdpfovcly Njx Am Tjlk The device can only be operated with a cable. Battery operation without function. Bluetooth Measuring principle: stylus method Probe: inductive skid probe Unit of measurement: selectable Measuring range: 350 µm Profile resolution: 8 nm Characteristic values: Ra, Rq, Rz (Ry (JIS) corresponds to Rz), Rz (JIS), Rmax, Rp, RpA (ASME), Rpm (ASME), Rpk, Rk, Rvk, Mr1, Mr2, A1, A2, Vo, Rt, R3z, RPc, Rmr (tp (JIS, ASME) corresponds to Rmr), RSm, RSk, RS, CR, CF, CL, R, Ar, Rx, Rv Vertical scale automatic/selectable Horizontal scale dependent on cut-off Total distance In according to ISO/JIS: 1.25 mm / 4.0 mm / 12.5 mm Number n of individual measuring sections acc. to ISO/JIS: selectable 1-5 Scanning speed 0.5 mm/s Probe tip: 2 µm Measuring force: approx. 0.7 mN You are welcome to visit us for an inspection. We will be happy to arrange a cost-effective forwarding agent for you. organize You will receive a proper invoice. A net invoice can also be issued for foreign customers. Prerequisite is a valid VAT number. Subject to prior sale. Visit our store and have a look at our other offers. Company names and trademarks are the property of their owners and are used only to identify and describe the products. Deviations from technical data and errors in the description of the article may occur and are reserved.

Condition: refurbished (used), Year of construction: 2025, functionality: fully functional, grinding length: 500 mm, grinding width: 200 mm, The machine is currently under construction; delivery will be arranged upon request. Please contact us. Grinding area: 500 x 200 x 400 mm (400 mm between the center of the grinding spindle and the table) New electrical system and control: - Completely new electrical system, wiring, and conversion to a 24V control voltage - 5.5 kW Siemens grinding spindle motor, eliminating the need for a generator cabinet, with stepless speed control - Sensor control of the switching points of the X and Z axes - Cross table control via Siemens frequency converter and PLC - 2-axis digital measuring system - Programmable end-of-travel limit switch for the vertical/Y-axis - Adjustment of the cross table controls to eye level - Machine control at the usual position, with individual switch-off function Condition of the machine: - Geometrically overhauled - Grinding spindle runout within 3 µm - Completely new electrical system, compliant with VDE standards - 5.5 kW grinding spindle drive with new control, no rack required - Professional new paint job in RAL 7035 / 7012 - CE declaration of conformity Equipment: - Magnetic clamping plate - 24V magnetic control with holding force regulation and demagnetization - Side dresser Bljdpfx Amsb A D Nls Tok - Grinding wheel flange with wheel

Condition: refurbished (used), Year of construction: 1995, functionality: fully functional, power: 367.75 kW (500.00 HP), filling opening width: 700 mm, filling opening length: 1,200 mm, rotational speed (max.): 1,050 rpm, rotational speed (min.): 950 rpm, - Engine: Deutz 500 HP - Fill opening dimensions: 1200x700 mm - Rotor: 4 shafts and 40 stars - 950-1050 rpm - Throughput: 4-6 t/h Bodpfxoy I Uwas Am Telk - incl. new spare rotor & stars - completely overhauled & modernised

Year of construction: 2018, condition: refurbished (used), Flying cutoff unit TCC 120/168, made by OTO MILLS Recently revamped Complete flying cutoff unit including: - Accelerator (carriage transmission) - Main carriage motor - Cutoff unit TCC120 with base with linear guides, cutting head, clamping unit and support for tube at exit side - Control panel RENEWED - Electrical cabinet RENEWED - Hydraulic group - Cable chain - All existing documentation, manuals, drawings Specifications: - Type of saw : Friction - Material thickness : 1 –6 mm - Standard tube length : 3 –12 m - Diameter range : 42 –168 mm - Square tubes : 40x40 –130x130 - Rectangular tube : 50x30 –180x80 - Max. speed : 120 m/min - Length tolerance : +/-2 mm Round tube diameter: 42 – 168 mm Square tube diameter: 40×40 – 130×130 mm Rectangular tube diameter: 50×30 – 180×80 mm Material thickness: 1 – 6 mm Bsdpfovtpp Njx Am Telk Tube length: 3 – 12 m Type of saw: Friction Length tolerance: +/-2 mm Max. speed: 120 m/min

Condition: excellent (used), PAOLONI SAC RD 230 15/24 four-sided srtug machine Technical data: Max planing width: 230 mm Max planing height: 120 mm Diameter of the spindles: 40 mm Number of spindles: 4 Order of spindles: bottom right left top Number of top steel pulling rollers: 2 Number of top rubber pulling rollers: 1 Blsdpfx Ameuy H Nwo Tjk Number of smooth rollers in countertop: 1 Extraction spigot diameter: 3 x 120 mm Working table lubrication pump Manual lifting of the body Power supply: 400 V Total power: 21 kw Overall dimensions: Length: 3280 mm Width: 1290 mm Height: 1500 mm

Condition: new, functionality: fully functional, input voltage: 400 V, type of input current: three-phase, tool diameter: 60 mm, spindle mount: MK 5, rotational speed (max.): 2,000 rpm, rotational speed (min.): 38 rpm, overall weight: 3,800 kg, Equipment: CE marking, The RD 1600 VARIO radial drilling machine is a professional device for drilling holes in metal, wood, and other materials. Thanks to its high power and robust design, it ensures fast and precise drilling even under the most demanding conditions. The powerful 4.0 kW motor is equipped with a frequency inverter and offers a wide speed range of 38–2000 rpm. The arm, spindle head, and column each feature independent hydraulic clamping. The worktable measures 1740 x 980 mm, and the machine is equipped with automatic spindle feed, a coolant system, and motorized arm height adjustment. Maximum drilling capacity is 60 mm; tapping capacity up to M46. Standard features include stepless speed control with readout on a digital display, high spindle alignment with automatic brake, arm, head, and column all fitted with independent hydraulic clamps, a solid base suitable for machining large workpieces, and a massive, ground column ensuring smooth arm movement. The arm's motorized lifting function allows for series production without changing the spindle position. Control panel buttons allow locking/unlocking the head and column either together or individually. The arm guides are hardened and ground, and the machine's perfect balance ensures ideal feed of the spindle. Ideal for drilling, counterboring, reaming, and tapping. Technical specifications Maximum drilling capacity: 60 mm Maximum tapping capacity: M46 Spindle taper: MT5 Minimum spindle speed: 38 rpm Maximum spindle speed: 2000 rpm Spindle speed change—number of ranges/stepless: Stepless (38–275, 275–2000) Drive method: Gearbox Automatic spindle feed range: (8) 0.06–1.00 mm/rev Min. spindle/column distance: 350 mm Max. spindle/column distance: 1600 mm Spindle/table distance: 165–750 mm Min. spindle/base plate distance: 665 mm Max. spindle/base plate distance: 1250 mm Vertical travel of arm with head: 585 mm Horizontal travel of drilling head: 1250 mm Quill stroke: 325 mm Column diameter: n/a Cube table size: 750 x 500 x 500 mm Base plate working area: 1740 x 980 mm Motor power: 4 kW Voltage: 400 V Dimensions (W x D x H): 2600 x 1100 x 2770 mm Weight approx.: 3800 kg Bsdpfeytfxksx Am Tjlk Scope of delivery Cube table MK 5 / B 16 drill chuck Reduction sleeves MK 5/4, MK 4/3, MK 3/2 LED lighting Filled with Shell Tellus 46 oil Coolant system Inverter Digital speed readout Lifting motor Hydraulic motor Guarding Service tools Legally required safety guards Complete operation and maintenance documentation (Polish DTR) CE certificate 24-month full warranty without extra charges

Condition: excellent (used), Brand: KUKA Model: 00-168-334 TEACH PENDANT SMARTPAD Condition: LIKE NEW and Working Shipping: NOT included to price Payment: 100% payment prior to collection Bodjgqfkhjpfx Am Tslk PLEASE CONTACT US FOR FURTHER INFORMATION!

Condition: used, Multiplex boards used length 1680 mm width 1250 mm board thickness 45 mm weight 68,5 kg in the pallets there are 9 holes with diameter 12 mm several presentseveral present Bedpsl Uvxnsfx Am Tjlk