Used Tos Horizontal Lathes Tos Sui 63 for sale (16,035)

Condition: excellent (used), Year of construction: 2018, Heidenhain iTNC 640 CNC control Table dimensions: 1800 x 2200 mm Max. workpiece weight: 25,000 kg X-axis travel: 3,500 mm Y-axis travel: 2,500 mm Z-axis travel: 1,600 mm Spindle/cone diameter: 130 mm Speed range: 3,000 RPM Spindle power: 46 kW Max. torque at 100% duty cycle: 1,000 Nm Machine weight: 38,000 kg Itodpfxew Hbnvo Amijg Power-on hours: 16,631 Spindle hours: 4,430 Accessories: – Controlled B-axis – 40-position tool changer / chain-type magazine – Belt filter system with high-pressure pump – Chip conveyor – Heidenhain TS 460 workpiece probe – Automatic milling head type HUI 50 – Movable operator cabin Yp = 1,600 mm, Zp = 600 mm – Centralized lubrication system – Pfannenberg oil cooler – Documentation

Condition: used, Year of construction: 1984, turning diameter over cross slide: 1,600 mm, turning diameter: 2,000 mm, turning diameter over bed slide: 2,000 mm, turning length: 35,000 mm, workpiece weight (max.): 63,000 kg, Center Lathe SKODA - SUT 200 TD MACH-ID 9446 Manufacturer: SKODA Model: SUT 200 TD Year of manufacture: 1984 Tandem construction on one bed, with left and right headstocks Faceplate double tailstock left and right Double carriage Steady rest included Iodsynky Aopfx Amietg Roller rest included Operator panel with scales requires attention and replacement Motorized tailstock for each side (left and right) 3-bed way design Torque on chuck: 160,000 Nm Minimum turning diameter: Ø 315 mm Industries served: - Shipyards - Propeller shaft manufacturing - Hydraulic cylinder shafts - Camshafts - Defence & Aerospace - Rolls and shafts for steel mills - Crankshafts Specifications Metric / Imperial Turning length: 35,000 mm Swing over bed: Ø 2,000 mm Swing over carriage: Ø 1,600 mm Spindle power: 75 kW Bed width: 1,600 mm Quill diameter: Ø 400 mm Quill stroke: 250 mm Max spindle speed: 180 rpm Feed X-axis: 5,000 mm/min Feed Z-axis: 5,000 mm/min Workpiece weight: 63,000 kg Approximate dimensions: Length: 42,000 mm Width: 3,250 mm Height: 3,250 mm Weight: 158,000 kg Please note: The information on this page has been provided to the best of our knowledge and, where possible, obtained from the manufacturer. The information is given in good faith, but accuracy cannot be guaranteed. Accordingly, they do not constitute representations or contractual terms. We recommend verifying all important details.

Condition: used, Year of construction: 1959, total length: 3,500 mm, total width: 1,200 mm, total height: 1,500 mm, Colour: Green Empty weight: 2.000 kg - Year: 1959 - Documentation available: No - CE certificate present: No - Serial number: 37 - Drive system: Conventional - Centre height [mm]: 270 - Swing over bed [mm]: 540 - Carriage turning diameter [mm]: 360 - Distance between centres [mm]: 1500 - Bed width [mm]: 450 - Spindle bore [mm]: 62 Isdpfx Ajy Idtwsmiotg - Min. spindle speed [rpm]: 14 - Max. spindle speed [rpm]: 710 - Options: Fixed steady, Three-jaw chuck - Transport dimensions: 3500mm x 1200mm x 1500mm (l x w x h) - Transport weight [kg]: 2000kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total length: 6,400 mm, total width: 1,100 mm, total height: 1,400 mm, Colour: Grey Empty weight: 4.000 kg - Documentation available: Yes - CE certificate present: No - Drive system: Conventional - Power [kW]: 5.7 - Centre height [mm]: 300 - Swing over bed [mm]: 600 - Carriage turning diameter [mm]: 320 - Distance between centres [mm]: 4000 Itjdpey Auzuofx Amisg - Bed width [mm]: 400 - Spindle bore [mm]: 80 - Min. spindle speed [rpm]: 9 - Max. spindle speed [rpm]: 630 - Options: Three-jaw chuck, Fixed steady - Transport dimensions: 6400mm x 1100mm x 1400mm (l x w x h) - Transport weight [kg]: 4000kg - Transport packages [pcs.]: 4 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1998, total length: 2,600 mm, total width: 1,500 mm, total height: 2,100 mm, Empty weight: 1.500 kg - Year: 1998 - Documentation available: Yes - CE marking present: Yes - CE certificate present: No Itsdpfx Ajx Ad Uzjmieg - Serial number: P30162 - Drive system: Teach-in - Control system brand: Fanuc - Power [kW]: 7.5 - Centre height [mm]: 200 - Swing over bed [mm]: 400 - Carriage turning diameter [mm]: 245 - Distance between centres [mm]: 1250 - Bed width [mm]: 320 - Spindle bore [mm]: 55 - Min. spindle speed [rpm]: 15 - Max. spindle speed [rpm]: 2500 - Options: Three-jaw chuck, Removable bed - Swing over removable bed [mm]: 585 - Transport dimensions: 2600mm x 1500mm x 2100mm (l x w x h) - Transport weight [kg]: 1500kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total width: 1,700 mm, total length: 3,800 mm, total height: 2,000 mm, Empty weight: 6.000 kg CNC Internal grinder, converted from a CNC lathe - Documentation available: Yes - CE certificate present: No - Serial number: UC-1871 - Drive system: CNC - Control system brand: Fanuc - Control system type: 0-T - Power [kW]: 15.0 - Centre height [mm]: 115 - Swing over bed [mm]: 380 - Distance between centres [mm]: 635 - Spindle bore [mm]: 75 - Max. spindle speed [rpm]: 3500 - Options: Removable bed - Swing over removable bed [mm]: 520 - Transport dimensions: 3800mm x 1700mm x 2000mm (l x w x h) - Transport weight [kg]: 6000kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT Iedpew A I Uhefx Amistg VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total length: 6,800 mm, total width: 2,200 mm, total height: 2,000 mm, Empty weight: 11.000 kg Price: On request - Documentation available: Yes - CE certificate present: No - Drive system: Conventional - Centre height [mm]: 630 - Swing over bed [mm]: 1300 - Carriage turning diameter [mm]: 1000 - Distance between centres [mm]: 4000 - Bed width [mm]: 700 - Spindle bore [mm]: 120 - Min. spindle speed [rpm]: 2.8 - Max. spindle speed [rpm]: 400 - Options: Three-jaw chuck, Four-jaw chuck, Removable bed, Quick-change tool post, Fixed steady, Travelling steady - Swing over removable bed [mm]: 1700 - Transport dimensions: 6800mm x 2200mm x 2000mm (l x w x h) - Transport weight [kg]: 11000kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT Itodjx Iriajpfx Amijg VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 2006, total height: 1,750 mm, total length: 2,790 mm, total width: 1,570 mm, Empty weight: 4.300 kg Price: On request - Year: 2006 - Documentation available: Yes - CE certificate present: No - Serial number: GN08201038G - Drive system: CNC - Control system brand: Fanuc - Control system type: 0i-Mate TO - Power [kW]: 15.0 - Swing over bed [mm]: 250 - Distance between centres [mm]: 460 - Spindle bore [mm]: 62 - Max. spindle speed [rpm]: 4500 - Options: Removable bed - Swing over removable bed [mm]: 460 - Transport dimensions: 2790mm x 1570mm x 1750mm (l x w x h) Itedpfxowfpaqs Amijg - Transport weight [kg]: 4300kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1975, total length: 4,400 mm, total width: 1,450 mm, total height: 1,700 mm, Empty weight: 4.000 kg Itodpfxoxixh Ns Amiog - Year: 1975 - Documentation available: Yes - CE certificate present: No - Serial number: 1677 - Drive system: Conventional - Centre height [mm]: 230 - Swing over bed [mm]: 460 - Distance between centres [mm]: 2000 - Spindle bore [mm]: 70 - Min. spindle speed [rpm]: 7.1 - Max. spindle speed [rpm]: 1400 - Options: Three-jaw chuck, Quick-change tool post, Travelling steady, Fixed steady - Transport dimensions: 4400mm x 1450mm x 1700mm (l x w x h) - Transport weight [kg]: 4000kg - Transport packages [pcs.]: 4 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1997, total length: 1,500 mm, total width: 800 mm, total height: 1,500 mm, Empty weight: 700 kg - Year: 1997 - Documentation available: Yes - └ Type Documentation: User manual - CE marking present: Yes - CE certificate present: No - Serial number: 1101050 - Drive system: Conventional - Power [kW]: 4.2 - Centre height [mm]: 125 - Swing over bed [mm]: 250 - Carriage turning diameter [mm]: 160 - Distance between centres [mm]: 500 - Bed width [mm]: 160 - Spindle bore [mm]: 38 - Min. spindle speed [rpm]: 60 Itjdpox Dyqujfx Amiog - Max. spindle speed [rpm]: 3000 - Transport dimensions: 1500mm x 800mm x 1500mm (l x w x h) - Transport weight [kg]: 700kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: reconditioned (used), functionality: fully functional, machine/vehicle number: TCG 160 x 5M, turning diameter over cross slide: 1,280 mm, spindle bore: 105 mm, turning diameter: 1,600 mm, disc diameter: 1,600 mm, LATHE AVAILABLE FROM STOCK The heavy double-guide lathe TCG is a universal machine tool that allows roughing and finishing turning, drilling, threading, turning cones, boring, heavy and very heavy objects with one clamping. The TCG lathe is a lathe for machining objects with diameters of 1600 mm. The construction system and rigidity of the structure allow turning with large chip cross-sections and ensure high smoothness with minimal ovalization of the workpiece. The machine is located in our company ZAK in Poręba ul. Zakładowa 2 (Poland) Itodpfx Aevw Uu Ssmisg We encourage you to submit inquiries.

Condition: like new (used), Horizontal lathe Diameter above the bed 385mm Distance between centers: 900mm Spindle bore (mm) 51,5 Diam. above the carriage (mm) 220 Itedpfx Amsg R Sm Ioisg Spindle speeds 38 - 1600 (16x) Motor power kW 2.94 Voltage (V) 380 Hertz (Hz) 50

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. Itsdpfx Amoyln Ekeijg

Condition: used, Year of construction: 2016, functionality: fully functional, machine/vehicle number: MW141, Technical characteristics: Work area # Maximum turning diameter: 300 mm # Maximum workpiece length: 276 mm # X-axis travel: 250 mm / Rapid traverse X: 24 m/min # Z-axis travel: 460 mm / Rapid traverse Z: 24 m/min # W-axis travel: 520 mm / Rapid traverse W: 24 m/min Main Spindle # Spindle mount: A2-8 # Maximum spindle speed: Left 3000 rpm # Continuous power (100% duty cycle): Left - 15 kW / Right - 7.5 kW # Max workpiece diameter over bed: 520 mm # C-axis indexing accuracy: 0.001° # Bar capacity: Left spindle - 80 mm / Right spindle - 53 mm Counter-Spindle: # Spindle speed: 6000 rpm # Max bar diameter: 53 mm # C-axis indexing accuracy: 0.001° # Travel: 520 mm Motorized Tool Turret # Tool interface: Okuma interface # Number of stations: 12-position lower turret, all stations powered # Maximum speed: 4500 rpm, Milling motor power: 4.5 kW Electrical equipment # Supply voltage: 400V 3-phase # Connected load: 22.5 kVA Dimensions # Machine dimensions (L×W×H): 3200 × 2200 × 1900 mm; Weight: 5500 kg Main features and capabilities: # Horizontal design: optimal chip evacuation, parts catcher + custom parts conveyor belt # Additional coolant tank with 10 bar pressure for cutting tool cooling # CNC control: OSP-P300L-R # Chip conveyor # Fire protection system # Tool measuring system (Q SETTER) Itedpfx Amexxifksijg # Broken tool detection: Load force auto-learning analyzer managed by OSP-P300L-R # Workpiece detection on counter-spindle: Low-pressure compressed air sensors # Spindle cooling system # Documentation: Available electronically and as hardcopy Optional: Bar feeder: FMB model Turbo 10-72XT/3200/A # Bar feeder dimensions (L×W×H): 3500 × 800 × 1200 mm; Weight: 1500 kg Machine status: In operation

Condition: used, Year of construction: 2016, functionality: limited functionality, machine/vehicle number: MW127, Technical characteristics: Work Area - Maximum turning diameter: 300 mm - Maximum workpiece length: 276 mm - X-axis travel: 250 mm / Rapid traverse X: 24 m/min - Z-axis travel: 460 mm / Rapid traverse Z: 24 m/min - W-axis travel: 520 mm / Rapid traverse Z: 24 m/min Main Spindle - Spindle nose: A2-8 - Max. speed: Left spindle 3000 rpm - Power at 100% duty cycle: Left spindle - 15 kW / Right spindle - 7.5 kW - Max. swing over bed: 520 mm - C-axis indexing accuracy: 0.001° - Bar capacity: Left spindle - 80 mm / Right spindle - 53 mm Counter-Spindle: - Spindle speed: 6000 rpm - Max. bar diameter: 53 mm - C-axis indexing accuracy: 0.001° - Travel: 520 mm Isdpexxihfjfx Amistg Tool Holder with Driven Tools - Tool interface: Okuma interface - Number of tool stations: 12-position lower turret, all positions driven - Max. speed: 4500 rpm / Milling motor power: 4.5 kW Electrical Equipment - Operating voltage: 400V 3-phase, fused at 151A - Connected load: 22.5 kVA Machine Dimensions - Dimensions (L×W×H): 3200 × 2200 × 1900 mm - Weight: 5500 kg Main Features and Capabilities - Horizontal design: optimized chip evacuation, parts catcher and custom-made parts conveyor - Additional emulsion tank with 10 bar pressure for cutting tool cooling - CNC control: OSP-P300L-R - Chip conveyor - Fire protection system - Tool measuring system (Q Setter) - Broken tool detection: Load force auto-learning analyzer controlled by OSP-P300L-R - Part detection at counter spindle: low-pressure compressed air gauges - Spindle cooling system - Documentation: Available electronically and in printed format Machine Status: Currently operating with main spindle only - sub spindle requires repair OPTIONAL: Bar feeder: TopAutomazione model Fu352 SX - Bar feeder dimensions (L×W×H): 3500 × 800 × 1200 mm - Weight: 1500 kg

Condition: repair required (used), Year of construction: 2016, functionality: not functional, machine/vehicle number: MW144, Technical characteristics: Work Area - Maximum turning diameter: 300 mm - Maximum workpiece length: 276 mm - X-axis travel: 250 mm / Rapid traverse in X: 24 m/min - Z-axis travel: 460 mm / Rapid traverse in Z: 24 m/min - W-axis travel: 520 mm / Rapid traverse in Z: 24 m/min Main Spindle - Spindle nose: A2-8 - Maximum speed: Left 3000 rpm - Power at 100% duty cycle: Left – 15 kW / Right – 7.5 kW - Maximum swing over bed: 520 mm - C-axis indexing accuracy: 0.001° - Bar capacity: Left spindle – 80 mm / Right spindle – 53 mm Sub-Spindle: - Spindle speed: 6000 rpm - Maximum bar diameter: 53 mm - C-axis indexing accuracy: 0.001° - Travel: 520 mm Tool Turret with Driven Tools - Tool interface: Okuma interface - Number of stations: 12-position lower servo turret, all stations driven - Maximum speed: 4500 rpm - Milling motor power: 4.5 kW Itedpjxxidasfx Amijg Electrical Equipment - Mains voltage: 400V 3-phase - Connected load: 22.5 kVA Dimensions - Machine dimensions (L×W×H): 3200 × 2200 × 1900 mm - Weight: 5500 kg Main Features and Capabilities: - Horizontal design: optimized chip evacuation, parts catcher + custom parts conveyor belt - CNC control: OSP-P300L-R - Chip conveyor - Fire protection system - Tool measurement system (Q SETTER) - Broken tool detection: Load monitoring and automatic force analysis via OSP-P300L-R - Workpiece detection at sub-spindle: Low-pressure compressed air monitoring - Spindle cooling system - Documentation: Electronic / Hard copy available OPTIONAL Bar feeder: TOP Automazione, model FU 352 - Bar feeder (L×W×H): 3500 × 800 × 1200 mm; Weight: 1500 kg Machine Condition: NOT WORKING - Turret disassembled for repair - X-axis ballscrew to be replaced - Heat exchanger / lubrication unit to be replaced - Hydraulic unit to be replaced - Sub-spindle to be repaired - Spindle position encoder to be replaced - Chip conveyor to be repaired - Set of bar clamping guide and accessory kit - Set of bearings for pusher head

Condition: good (used), machine/vehicle number: 2212 0030, turning height: 1,150 mm, workpiece weight (max.): 4,000 kg, power: 0.037 kW (0.05 HP), TOS Vertical Lathe model SK 12 A, 37Kw Skoda main motor, plate diameter 1250mm, maximum diameter to be turned on the right carriage 1540mm, working height 1100mm, maximum weight of the part to be turned 4000kg, 1 carriage with 3-position turret, 1 vertical carriage with 45º inclination, includes the display of the degree inclination, weight of the lathe 20 tns, Iodpfx Amjqnwqzsietg

Condition: used, SECOND-HAND HORIZONTAL COPYING LATHE WITH 4 SPINDLES BACCI - Spindles distance 180 MM - With cabin Itjdswr Uknjpfx Amisg

Condition: good (used), Year of construction: 2004, spindle speed (min.): 3,500 rpm, travel distance Z-axis: 1,000 mm, Model Year: 2004 Chuck Diameter: 12" Number of Axes: 3 Length: 1000 mm Swing Over Bed: 350 mm Spindle Speed (RPM): 3500 Itodpfxsx Nvr Uj Amisg Machinable Materials: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, Peek

Condition: good (used), Year of construction: 2004, spindle speed (min.): 3,500 rpm, travel distance Z-axis: 1,000 mm, Model Year: 2004 Itodpfx Aex Nvpasmiog Chuck Diameter: 12" Number of Axes: 2 Length: 1000 mm Swing Over Bed: 350 mm Spindle Speed (RPM): 3500 Processable Materials: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, Peek

Condition: good (used), Year of construction: 2008, spindle speed (min.): 4,000 rpm, travel distance Z-axis: 500 mm, throat depth: 300 mm, Year of manufacture: 2008 Chuck diameter: 8" Number of axes: 3 Length: 500 mm Neck diameter: 300 mm Spindle speed (rpm): 4000 Iedpfx Aex Nvm Ssmistg Machinable material types: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Derlin, Peek

Condition: good (used), Year of construction: 2008, spindle speed (min.): 4,000 rpm, travel distance Z-axis: 500 mm, throat depth: 300 mm, Model Year: 2006 Chuck Diameter: 8" Number of Axes: 3 Length: 500 mm Swing Over Bed: 300 mm Spindle Speed (RPM): 4000 Machinable Materials: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, PEEK Ijdpfex Nvm Ejx Amiotg

Condition: good (used), Year of construction: 1995, spindle speed (min.): 4,000 rpm, travel distance Z-axis: 250 mm, throat depth: 300 mm, Year of manufacture: 1995 Chuck diameter: 8" Iodpfx Amjx Nuxgoijtg Number of axes: 3 Length: 250 Swing diameter: 300 mm Spindle speed (RPM): 4000 Machinable materials: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, Peek

Condition: good (used), Year of construction: 2007, functionality: fully functional, spindle speed (max.): 4,000 rpm, travel distance Z-axis: 500 mm, throat depth: 300 mm, Model Year: 2007 Chuck Diameter: 8" Number of Axes: 2 Length: 500 Swing Over Bed: 300 mm Spindle Speed (Rpm): 4000 Machinable Material Types: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, PEEK Ijdpox Npbiefx Amietg

Condition: good (used), Year of construction: 2013, functionality: fully functional, rotational speed (min.): 4,500 rpm, feed length Z-axis: 500 mm, fuel type: electric, fuel: electricity, throat depth: 500 mm, Model Year: 2013 Chuck Diameter: 12" Number of Axes: 2 Length: 500mm Swing Over Bed: 500mm Spindle Speed (RPM): 3000 Itjdjx Nhx Tspfx Amisg Processable Material Types: Steel, Aluminum, Titanium, Graphite, Copper, Invar, Composite, Delrin, Peek