Used Brake Calibration Machine for sale (78,290)

Condition: new, Year of construction: 2025, functionality: fully functional, input voltage: 380 V, input frequency: 50 Hz, stroke length: 200 mm, operating speed: 50 mm/s, reverse speed: 180 mm/s, table length: 3,200 mm, total length: 3,915 mm, total width: 1,605 mm, total height: 2,655 mm, overall weight: 8,000 kg, bending force (max.): 1,000 t, bending angle (max.): 90 °, warranty duration: 24 months, working height: 450 mm, All-Electric Servo Bending Machine Nominal force(KN): 1000 Slider stroke(mm): 200 Throat depth (mm): 360 X-axistravel(mm): 600 R-axistravel(mm): 200 Z-axistravel(mm): 2500 🔹 Smart CNC System – SL100-P with high-end algorithms and 12-inch touchscreen for intuitive operation. 🔹 High-Precision Structure – Finite element analysis (FEA), annealed, and one-time machining for long-term stability and accuracy. 🔹 4-Axis Intelligent Backgauge – AC servo-driven, high-speed positioning with automatic collision avoidance. 🔹 Precision Compensation System – Adjustable convex strips & fine-tuning mechanism for optimal bending accuracy. Ksdpfxsv Hchlj Am Eodk 🔹 Powerful & Durable Drive – High-torque servo motor, heavy-duty ball screws & sealed protection for longevity. 🔹 Fully Closed-Loop Control – Y1/Y2 magnetic scale feedback, positioning accuracy ±5μm. 🔹 Optimized Electrical System – Closed electrical box, heat dissipation, & neat wiring for reliability and easy maintenance. 🔹 Imported Precision Components – Ball screws & linear guides ensure accuracy without stroke compensation. 🔹 High precision, stability, and smart automation – designed for professional sheet metal bending!

Condition: used, Year of construction: 1992, functionality: fully functional, power: 2,500 kW (3,399.05 HP), input voltage: 380 V, input current: 53 A, input frequency: 50 Hz, type of input current: three-phase, pressing force: 250 t, table length: 4,050 mm, year of last overhaul: 2007, Equipment: documentation/manual, We are offering this used Eisen u. Hammerwerk GmbH - EHT EHPS 25-40 press brake (hydraulic press brake, die bending press) for sale. Available immediately. Ready for operation. For sale due to new acquisition. Specifications: - 250 t pressing force - Cybelec DNC880S CNC control with Windows operating system (retrofitted in 2007) - Foot pedal control - Various upper tools in different lengths (segmented) - Lower tool (reversible die) in various lengths (segmented) - Hydraulic tool clamping - Support table for bent parts Technical data: - Machine type: EHPS 25-40 Kjdjy D Sy Repfx Am Ejdk - Force: 2500 kN - Year of manufacture: 1992 - Working length: 4050 mm - Serial number: 207380 - Power supply: 3~ - Frequency: 50 Hz - Operating voltage: 380 V - Control voltage: 24/220 V - Rated current: 53 A - Main fuse rated current: 80 A - Circuit diagram number: 209-178/372 If you have any questions or require more information, feel free to send us a message or give us a call. Machine location at our premises: Pavic Fahrzeugtechnik Homberg GmbH Poschweg 2 34576 Homberg Relbehausen Germany This is a non-binding offer. Subject to prior sale, errors and changes excepted.

Condition: excellent (used), Year of construction: 2018, You are bidding on: a branded folding machine from the renowned top manufacturer Schröder Device Features: - Schröder folding machine - Bends sheet metal up to 1 mm steel, aluminum, etc.; up to 1.5 mm - Bending length just over 2 meters - Angle gauge - Foot closer - Pneumatic support (use is possible without compressed air as well; with the pneumatic support, bending can be performed almost hands-free with fingertip control via the handle grip, significantly easing strain on the back) Optional equipment available on request: additional front rail and radius rail (round bar), as well as rotary shear and depth stop with finger guard, compressor, etc. Matching guillotine shear or mechanical/electric shears for 1 meter sheets also available—package price possible and can be arranged on request. The machine is in the usual high quality; it has not been used for the past two years due to business closure. Optionally, you can find and purchase many other machines and machine accessories such as various rails, depth stops—everything needed for sheet metal and steel processing including folding machines, guillotine shears, drills, slip rollers, slitting and profiling machines, accessory parts (beading units, round rollers for gutter production, backgauge, etc.), as well as other hand tools and spare parts from many top manufacturers in our shop. Please feel free to contact me with any questions. Kdjdpeyx S H Tefx Am Eek You will receive an invoice with VAT shown. Free loading possible – machine weight approx. 1050 kg. Viewing and testing are possible by prior telephone appointment. Payment in cash upon collection. Benefit from our experience and expertise—we are happy to advise you. Collection by the buyer (or by a forwarding agent commissioned by the buyer) should take place within 10 days after the end of the auction. Location: 97261 Güntersleben Article number: Schröder Folding Machine 2m

Condition: used, CNC press brake FASTI type 904-125/30 Kdsdpfohmmfksx Am Ejk serial no. 95-904-5775 year of construction 1995 Pressure capacity 125 ton. Working length 3050 mm Stroke approx. 335 mm Stand projection 300 mm Clearance between the side uprights 2550 mm Tool installation height max. 465 mm (opening width between the tool holders) Table width 90 mm (the clamping system is mounted on the table) Table height above floor 875 mm (910 mm with clamping system) Backgauge X-axis 500 mm Backgauge R-axis 115 mm Backgauge Z-axis approx. 1950 mm Lowering speed Y rapid traverse 90 mm/s Lowering speed Y-operation 8.9 mm/s Return stroke speed Y-retraction 75 mm/s Oil filling approx. 160 liters Motor power 18.5 kW Mains connection 400 Volt, 50 Hz, 20 Amp. - 7-axis CNC control DELEM type DA 58 with LCD screen - 1 axis for back gauge - stop depth (X-axis) - 2 axes for back gauge - fence height (finger R1 + finger R2) - 2 axes for back gauge - stop finger, laterally movable (finger Z1 + finger Z2) - 2 axes for press beam with servo valves and measuring system Y1 and Y2 - Operation via electric foot switch and 2-hand control panel or 2-hand control panel only - Hydraulic tool clamping for the TRUMPF upper tool system, with 20 mm clamping groove - Hydraulic tool clamping for the lower tool with 13 mm table groove, depth 21 mm (tool pin 13 x 20 mm) - FIESSLER safety light barrier, type AKAS - 2 material support arms at the front, manually movable to the side and height-adjustable - Electrical diagram, hydraulic diagram, user manual for control available - Control cabinet on the machine - without tools Space requirement L x W x H 5000 x 2500 x 3050 mm Transport dimensions L x W x H 5200 x 1900 x 2950 mm Weight 8.5 tons. Good condition

Condition: used, 12-piece die block for GEWA press brake Bending tool for press brake, lower tool Type: 0255/14 V-block size: 16 mm for 90° Kodpfewbvmisx Am Eedk V-block angle: 88° Die depth: approx. 8 mm Height: 120 mm Max. pressure per meter: 100 t/m Die base width: 60 mm Total length: 4175 mm Segment lengths: 4 x 835 mm, 1 x 400 mm, 1 x 200 mm, 1 x 100 mm, 1 x 50 mm, 1 x 40 mm, 1 x 20 mm, 1 x 15 mm, 1 x 10 mm Weight: 110 kg Very good condition

Condition: used, Hand - swing bending machine KRAMER type AMS 650 x 1,5 Hand swivel bending machine, press brake Kedpfxodzqaao Am Esdk year of construction approx. 1985 working length 650 mm sheet thickness at 40 kg/mm2 1,5 mm upper beam opening approx. 60 mm bending beam adjustment ca- 0-25 mm bending angle 0-180 - Upper beam adjustment via hand crank - pre-screw rail for the bending beam - one-piece sharpening rail 135° space requirement L x W x H 1200 x 600 x 1100 mm weight 160 kg good condition

Condition: used, Bending tool, die, lower knife, lower tool, lower beam, Ksdpfscn Rd Rjx Am Eodk -Tool: for folding machine -Widening: for lower cheek -Dimensions: 33/76/3040 mm -Bore distance: 280 mm -Hole diameter: 18 mm -Length: 3040 mm -Weight: 33 kg

Condition: used, Bending tool, die, upper knife, upper tool, upper beam -Tool: for folding machine -Dimensions: 60 x 15 mm Kdsdpfxjcn Shrs Am Esk -Length: 1020 mm -Weight: 6 kg

Condition: good (used), CALIBRATING SANDING machine model LEVIGALTECNICA MIKRO SRTV/C1000 second hand machine carpet in rubber Kodpjtlplxsfx Am Esdk max. working width mm.1000 machine composed by 1 belt combined : calibrating roller in rubber diam.mm.150 + pneumatic pad main motor power Kw 10 belt dimension mm. 2150 x 1030 feed speed of conveyor belt : n.02 speed m/min. 5 / 10 min. / max. working heigth mm. 3 / 165 volt. 380/50 weigth kgs. 800

Condition: used, 2-station notching machine and folding machine EUROMAC type Multi 220/6R Press brake, press brake, notching machine Serial no. M11941298 Year of manufacture 1998 Cutting capacity 6 mm steel at 45 kg/mm2 4 mm for stainless steel Station I (notching) Notching angle 60° to 140° (with special blade from 30° to 140°) Knife length 220 mm Table size 950 x 640 - Manual angle adjustment via hand wheels - Notching angle with built-in blade set from 60° to 140 - Hydraulic clamping of the upper and lower knives - Automatic cutting gap adjustment - sheet hold-down device - Scaled measuring tapes embedded in the table - stop rails with angle adjustment - Operation via foot switch Kjdpfomck Ryex Am Esdk Station II (die bending device) Pressure force 18 ton Table size 950 x 340 Working height 1100 mm - stepless lifting speed - Infinitely adjustable stroke limiter - Stroke adjustment up to 30 mm working stroke - Reversible prism with 4x 90° prisms, length = 415 mm - 90° upper tool, length = 415 mm Motor power 4 kW Mains connection 400 Volt, 50 Hz Space requirement L x W x H 1150 x 1050 x 1460 mm Weight approx. 1000 kg good condition

Condition: used, Servo press brake SAFAN Type SMK-P 50-2550 TS1 Serial No. MK 285 Year of manufacture 1998 CNC Control SAFAN Software Version 5.07 TS1 Pressing force 500 kN (50 tons) Working length 2550 mm Stroke 215 mm Clearance between side frames 2700 mm Tool installation height max. 414 mm Table width 55 mm Table height above floor 950 mm Approach speed approx. 75 mm/s Return speed approx. 75 mm/s Working speed approx. 1.6 to 15 mm/s Motor power 9 kW Power supply 400 Volt, 50 Hz, 9 kW - 4-axis CNC control SAFAN Software Version 5.07 TS1, Y1 and Y2 axis for press beam - 2-axis back gauge: X-axis (depth adjustment), R-axis (height adjustment) - 2 back gauge fingers, lateral manual adjustment (Z1, Z2) - Press beam driven by 2 servomotors and belt drive - Infinitely variable working speed - Operation via electric foot switch and/or two-hand control panel - 13 clamping holders for upper tool UKB system, Type 50.571 (UKB System A) - Tool mount for lower tool: 55 mm wide with 13 mm slot, slot depth 21 mm (Trumpf system or UKB System B) Ksdoxpqy Depfx Am Esdk - Without press brake tools (new tool set from UKB costs approx. EUR 3,600 net) - Total recorded operating hours = 8,120 h - Work strokes 1,049,789 Space requirement (L x W x H): 3450 x 1850 x 2650 mm Weight 5,000 kg Good condition

Condition: used, CNC Press Brake AMADA Type HFBO 50 x 2000 Serial No. HFBO 50 20 S60906 Year of manufacture: 1996 Press brake with 8 axes - CNC control Operator II Pressing force: 50 tons Working length: 2090 mm Stroke: 200 mm Frame depth: 420 mm Distance between side frames: 1660 mm Max. tool installation height: 460 mm Table width: 60 mm Table height above floor: 910 mm Motor power: 4.5 kW Mains connection: 400 Volt, 50 Hz, 20 Amp. - 8-axis CNC control Operator II (Y1-Y2 / X1-X2 / Z1-Z2 / R1-R2) - 2 freely programmable backgauge fingers, movable laterally and in height (Z1+Z2+R1+R2) - Press beam with servo valves and measuring system Y1 and Y2 - Operation via electric foot switch and/or two-hand control panel - Mechanical lever-style tool clamping for the upper tool (5 AMADA Expert, 5 UKB 50.667 H=120 mm) Kdjdpow Iq Ugsfx Am Eok - Tool holder for lower tool, 60 mm wide - 11-piece upper tool set, 30°, total length 1675 mm - consisting of: 1x 835 / 1x 300 / 1x 165 / 1x 50 / 1x 45 / 1x 35 / 1x 20 / 1x 15 / 1x 10 / 2x 100 mm (end pieces) in length - 2-piece lower tool, 88° - V8, total length 1250 mm - consisting of: 1x 835 / 1x 415 mm in length - Indicated operating hours: 30,537 h - Operating manual, electrical diagram, spare parts book included Weight: 4,700 kg Good condition

Condition: used, Swivel bending machine KRAMER type A-Maut. II 1000 No. 48 287 Year of construction 1990 effective length 1060 mm Kodpfx Amofnabyj Eodk max. sheet thickness 3.75 mm Stroke of upper beam 180 mm Adjustability of the folding beam 60 mm Backgauge 480 mm Drive power of folding beam drive 4 kW Drive power upper beam drive 1.5 kW Mains connection 400 Volt, 50 Hz - Manual and semi-automatic control - Angle adjustment via angle preselection disk - one-piece pointing rail 135° - backgauge with hand crank adjustment and simple measuring scale - Continuous fence rail - Electric foot switch, 3-position Space requirement L x W x H 2200 x 1350 x 1500 mm Weight approx. 2.3 tons good condition

Condition: used, Year of construction: 1998, Technical details: internal diameter: 63 mm swing diameter: 800 - 320 mm grinding depth: 380 mm dimensions of grinding wheel: Ø 65 x 25mm (Topfscheibe) mm feed:: 0,05 - 0,40 U/min / 8 step U/min total power requirement: ca. 1,1 kW weight approx.: 1060 kg dimension machine xH: 1,1 x 1,1 x 1,4 m Brake Drum Grinding Machine Kdedpfx Amju Ngauj Eok - turning Ø max./min.: 800 / 320mm - brake drum holder: 63mm, quill stroke 120mm - turning support: longitudinal travel 380mm; transverse travel 200mm - steel holder holder: 180 x 140mm, steel holder 58mm, turning tool for insert holder 20 x 20mm - operation via control panel *

Condition: used, Year of construction: 1998, Technical details: internal diameter: 63 mm swing diameter: 320 - 800 mm grinding depth: 380 mm total power requirement: ca. 1,1 kW feed:: 0,05 - 0,40 mm/U / 8 step U/min weight approx.: 1060 kg Kdedpfx Amju Ngcie Eok dimension machine xH: 1,1 x 1,1 x 1,4 m Brake Drum Grinding Machine - turning Ø max./min.: 800 / 320mm - brake drum holder: 63mm, quill stroke 120mm - turning support: longitudinal travel 380mm; transverse travel 200mm - steel holder holder: 180 x 140mm, steel holder 58mm, turning tool for insert holder 20 x 20mm - operation via control panel *

Condition: new, Year of construction: 2026, control type: manual, degree of automation: manual, actuation type: manual, working width: 1,020 mm, bending angle (max.): 135 °, sheet thickness (max.): 2 mm, Bernardo TB 1020 is a universal, manual segmented bending machine with a working length of 1020 mm, ideal for sheet metal work in repair and craft workshops. The machine features a robust construction and a foot-operated upper beam clamping system, allowing the operator to position the workpiece freely with both hands. Thanks to the exchangeable segmented upper beam, the machine precisely forms various profiles and boxes from sheet metal up to 2.5 mm thick. - Bending machine for universal use in repair and metalworking workshops - Compact, stable design with a modern look - Simple adjustment of the upper beam clamping via foot pedal; both hands remain free to accurately position the workpiece - Manual bender for standard tasks - Segments on the upper clamping beam expand bending possibilities - Offered at a competitive price - Fast and easy operation with a handle - Pedal covered with non-slip rubber sheath - Simple lower beam clamping adjustment to suit sheet thickness - High upper beam clamping force for tall bend profiles - Segment sizes: 2.5 / 3 / 3.5 / 4 / 4.5 / 5.0 / 7.5 / 10 / 15 / 20 / 27 cm Technical specifications: Working length: 1020 mm Max. sheet thickness (mild steel): 2.5 mm Max. opening: 48 mm Bending angle: 0 - 135° Dimensions (width): 1350 mm Ksdpfx Asyn Iiujm Esdk Dimensions (depth): 1115 mm Dimensions (height): 1140 mm Weight approx.: 290 kg

Condition: new, Year of construction: 2025, We provide our customers with a modern and comprehensive service in the field of building sheet metal working machines. Long-standing employees guarantee continuity and a high quality standard. Thanks to ongoing training, they meet the high requirements. Folding bench ZGR 2640/0.8 Guarantee 12 MONTHS. Certificate CE 2640mm working length STEEL SHEET 0.8 mm Bending angle 145 * Kodpechuylefx Am Ejdk shearing along the entire working length, raise the upper cheek in three layers, maximum clear width between the cheeks 80 mm rear rack for holding sheet metal, Servo motors for lifting the cheeks, cutting limiter at the front to ensure the specified cutting width, Roller scissors - with adjustment of the scissors guide and rollers made of high-alloy steel of very high resistance to wear. This allows sheet metal to be cut over a very long period of time without the need for grinding the roller shears. The performance of the roller shears is about 40 km of sheet metal with a thickness of 0.5 mm - up to the first grinding. The roller shears can be sharpened an average of 35 times. The roller cutter weighs approx. 6.5 kg. Roller scissors plus 350 euros Manual folding machine plus 75 euros the weight 290 kg Delivery: every week We are looking forward to your contact! Invoices are issued with 0% as intra-community delivery or with plus 23% of VAT.

Condition: excellent (used), Year of construction: 2016, functionality: fully functional, input voltage: 400 V, grinding belt width: 340 mm, grinding height: 150 mm, height adjustment type: mechanical, actuation type: manual, total height: 2,200 mm, total length: 1,200 mm, total width: 1,000 mm, overall weight: 300 kg, GNT (Italy) Calibrating Machine – Extra Robust Construction For sale: a calibration grinder from the Italian manufacturer GNT. This machine is designed for precise grinding of metal components and features a robust, stable construction ideal for industrial use. Technical specifications: Grinding belt width: 300 mm Kdedpfjykl Tcjx Am Ejk Maximum workpiece thickness: 150 mm Manual thickness adjustment with digital readout Linear belt speed adjustment Belt movement and position controlled by an oscillator Permanent magnet under the belt for secure workpiece holding Machine weight: 300 kg Dimensions: 1200 mm (length) × 1000 mm (width) × 1200 mm (height) The machine is in excellent technical condition and ready for immediate use in serial production or precise machining of small metal parts. For more information, technical details, or to arrange a viewing, please contact us.

Year of construction: 2010, condition: used, Levibreton KGP is a calibrating machine for levelling strips and tiles, which move on a conveyor belt, using a series of diamond tools. Kdodsvun T Aspfx Am Eek

Condition: used, Year of construction: 2002, Levibreton KCP is a calibrating machine for levelling granite tiles, which move on a conveyor belt, using a series of diamond tools. This machine is based on a revolutionary processing concept, covered by Breton patent, which employs calibrating spindles with double motorization: in each spindle, the first motor provides the low-speed rotation of the roller-holding head, while the second motor provides the high-speed rotation of 6 radial rollers equipped with di-amond tools. Ksdpfjvuaxwjx Am Esdk This new technology offers the following advantages: - rapid adjustment of the working width as the calibrating section does not require any variation; - perfect surface levelling; - "fine-honed" surface finish which enables to reduce the number of the following levelling units and, consequently, the dressing costs.

Condition: new, Year of construction: 2025, Sheet metal folder ZGR-3140/1.0 We have a new, high-quality folding machine of 3140 mm/ 1.0mm. This machine guarantees very high quality and agility of the work doing by the roofers. Our main task is the production of folding machines, with which we are concerned many years. The bending machine is equipped in degree scale, Romans screws, rear frame and gas struts. Directly from manufacturer! - max. working length 3140 mm - steel plate to 1.0 mm - our machines bend both a copper sheet and aluminum sheet - the total weight of machine is 600 kg - the clearance between the lower beam (fixed) and the upper beam (pressed) of 80 mm - bending angle of 145 degrees - thickness of the bending beam of 20mm - new, full machine - delivery to the client - certificate CE - TAPPING ANGLE IS FREE !! Ksdschwa Dspfx Am Esdk Price excl. shipping We provide invoices with 0% of tax. Delivery every week :)

Year of construction: 1993, condition: ready for operation (used), Automatic sander VIET Mod. Rita 4C EL Fixed plane moving heads Working width 1350 mm Working height 4 – 160mm Nr 03 suction hood depressors diameter 150 mm Belt feed speed 6 – 20 with 3 kw inverter Hood carpet cleaning brush diameter 120 mm Composition: 1st transversal polishing unit mod. TET 60 electronic pad 60 sectors Lamellar tape 6150 x 140 mm Our abrasive 8350 x 170 mm Kdsdpjltlx Tofx Am Eok Velocity 5.6 – 26.2m/s Inverter kw 15 Three 140 mm diameter extraction hoods 2nd roller sanding unit mod. R320 – 40 rubber coating 40° SH Sanding belt 3250 x 1400 mm Speed 1.5 – 12.5m/s Inverter kw 15 Belt cleaning blower Two extraction hoods with a diameter of 140 mm and one with a diameter of 200 mm 3rd buffer polishing group mod. TE 60 electronic pad 60 sectors Sanding belt 3250 x 1400 mm Velocity 2.9 – 14.1m/s Inverter kw 15 Belt cleaning blower Two extraction hoods with a diameter of 140 mm and one with a diameter of 200 mm 4th cross sanding unit mod. TET 60 electronic pad 60 sectors Lamellar tape 6150 x 140 mm Our abrasive 8350 x 170 mm Velocity 5.6 – 26.2m/s Inverter kw 15 Three 140 mm diameter extraction hoods 5th scotch-brite group Engine kW 0.55 Suction hood diameter 140 mm 6th brush unit Engine kW 0.55 Suction hood diameter 140 mm 7th panel cleaning rotary blower group

Condition: new, functionality: fully functional, Year of construction: 2025, machine/vehicle number: 1235, controller manufacturer: Germany Beckhoff, working width: 1,200 mm, bending angle (max.): 90 °, sheet thickness steel (max.): 4 mm, sheet thickness aluminum (max.): 6 mm, total length: 1,685 mm, total width: 1,262 mm, type of input current: three-phase, workpiece length (max.): 1,200 mm, workpiece height (max.): 430 mm, nominal power (apparent): 3 kVA, number of spindles: 6, opening width: 400 mm, - Germany Beckhoff System, Closed-loop control, High bending accuracy. - Italy GIVI MEASURE precision linear encoder. Kdsdowfwkqepfx Am Eek -High strength machine body after heat-treated. - No need to change bending tool. - The Blank-holder tool can automatically change the length basic on the sheet length. - Multilateral automatic continuous bending. -Automatic programming software can finish all the process - Automatically check and optimize. the process -All servo motor control, fast and energy saving - Automatically control pressing force.

Condition: new, Year of construction: 2025, functionality: fully functional, machine/vehicle number: 1032, warranty duration: 12 months, total width: 2,300 mm, total length: 1,685 mm, bending angle (max.): 90 °, working width: 3,200 mm, workpiece length (max.): 3,200 mm, workpiece height (max.): 370 mm, nominal power (apparent): 4 kVA, number of spindles: 4, sheet thickness aluminum (max.): 6 mm, sheet thickness steel (max.): 4 mm, type of input current: three-phase, -Complete machine frame processing -Double-cylinder electro-hydraulic synchronous control -A variety of electro-hydraulic CNC systems are optional -Mechanical compensation Ksdjwfwkwopfx Am Eodk -Segmented mold -High-precision back gauge structure -Scalable number of axes

Condition: not inspected (used), functionality: unexamined, overall weight: 70 kg, total height: 170 mm, jaw width: 160 mm, total length: 550 mm, total width: 160 mm, No reserve price – guaranteed sale to the highest bidder! Placing a bid obligates you to collect the item on time, either between 11/05/2026 and 13/05/2026 or between 18/05/2026 and 21/05/2026! TECHNICAL DETAILS Jaw width: 160 mm Kjdoyn Edpspfx Am Ejdk MACHINE DETAILS Dimensions & Weight Dimensions (L x W x H): 550 x 160 x 170 mm Weight: 70 kg External reference: Lot 65/ Lotec