Used Durselen Corta Pb-01 Ste for sale (20,187)

Condition: good (used), Durselen Corta PB-01 STE Automatic paper drill The device is in very good condition, ready to work. This is one of the newest Durselen models, the most advanced model. Production Germany. 6 drilling heads with adjustable spacing. Ljdpfsu Ul Hnox Afujac The machine has a pneumatic drill cooling system and lubrication. A programmer for controlling the table that allows you to approach programmed distances. Smooth regulation of spindle speeds and smooth regulation of the speed of lowering the heads. Waste disposal compressor Sliding column system on a tape. Technical data: Drill diameter: 2-10 mm, Stack height: 60 mm, weight: 400 kg Power supply 380V Automatic drilling cycle, controlled by a foot pedal. Solid construction on a pedestal. Waste is directed to the external pocket. The set includes operating tools, instructions, drills and sharpener.

Year of construction: 2001, condition: excellent (used), machine/vehicle number: PB 04 02.01/1070, Further MACHINERY / SPARE PARTS & MACHINE COMPONENTS of this type are available in our warehouse. ON REQUEST Ledpfsidqtlox Afueac

Condition: used, Year of construction: 1994, Format: 0x0 Equipment: 4 head paper drills Foot control Technical data: Number of drill heads: 4x Lsdpfx Afozfwkbeuoac Drill bit diameter: 3 - 14 mm Drilling distance: 1 - 420 mm Stack height: 50 mm Speed: 680 - 2,900 rpm

Condition: used, Year of construction: 2016, Ref:11045 . 2016 Dürselen PB 04 N Paper Drill Free standing 4 headed paper drill Equipped with: Four drilling heads with adjustable spacing. Pneumatic cooling and lubrication for drills. Automatic drilling cycle, foot pedal control. Waste directed to outer door Drill table with adjustment, front and side margins. Table lock is automatically released. Technical data: Diameter of the drill: 2-10 mm, Lajdox Nfp Ajpfx Afuec Stack height: 60 mm.

Condition: used, Year of construction: 1997, Format: 0x0 Equipment: 4 head paper drills Foot control Technical data: Number of drill heads: 4x Drill bit diameter: 3 - 14 mm Ledpfx Ajyxqyljfuoac Drilling distance: 1 - 420 mm Stack height: 50 mm Speed: 680 - 2,900 rpm Power specifications: Frequenz: 50 Hz Machine Voltage: 400V

Condition: good (used), Durselen PB 16A four-head paper drill The device is in perfect condition, like new! This is the newest one. currently produced model. Production Germany. Four drilling heads with adjustable spacing. The machine has a pneumatic drill cooling system. Sliding work table. Automatic column system – a belt that is moved to the next position when worn out Technical data: Drill diameter: 2-16 mm, Stack height: 50 mm, weight: 300 kg Power supply 380V Automatic drilling cycle, controlled by a foot pedal. Smooth regulation of spindle speed and lowering speed of heads on inverters. Solid construction on a pedestal. Waste is directed to the built-in bin Drill table adjustable in every plane, front and side margins. The set includes operating tools and drills. Lsdpfx Afsu A Rr Isusac

Condition: used, Bohrunterlage mit Bohrbandmechanik inklusive eines Bohrbands / Drilling pad with drill band mechanism including a drill band Papierbohrmaschine / Paper Drilling machine Dürselen Corta PB 04 N  Baujahr / Year 2013 - Serial-No. PB04.01.03.1629 4 Bohrköpfe / 4 Drilling Heads Laedoxn S Itjpfx Afuec Stapelhöhe / Stack high max. 50mm Einlegetiefe hinter den Bohrern / Depth behind the Drilling heads 42mm Lochabstand / Hole distance 31,7 - 293mm Online-Video-Inspection by WhatsApp - MS Zoom - Telegram On Stock Emskirchen/Nürnberg - Available Immediately - Can be test

Condition: good (used), Year of construction: 1998, 4 spindle paper drilling machine Dürselen PB 04 year 1998 Machine works perfectly complete with instructions, spare parts list, drills and tools - Drill hole diameter 3 - 15 mm - drill distance between the drill heads 31.7 - 293 mm - max. drilling distance over sliding table 420 mm - min. drilling distance above sliding table 1 mm Ledeuiy Snspfx Afujac - Insertion depth behind the drills 65 mm - Sliding table width 450 mm - Sliding table size in front of the drills 300 mm - Max. stacking height 50 mm The sliding table can be "programmed" for individual drilling can be "programmed" for individual drilling patterns. Dimensions W 77 cm x D 76 cm x H 135 cm Power connection 380 V Weight 275 kg

Condition: like new (used), Year of construction: 2026, power: 3 kW (4.08 HP), pressing force: 30 t, stroke length: 150 mm, operating speed: 10 mm/s, reverse speed: 70 mm/s, throat depth: 255 mm, ram plate length: 1,270 mm, Equipment: CE marking, documentation/manual, safety light barrier, Standard Equipment Stroke: 150 mm Distance Between Upper and Lower Dies (Daylight): 265 mm Throat Depth: 255 mm Bending Length: 1270 mm Distance Between Columns: 1010 mm Machine Features Double-cylinder upper beam bending system Steel frame construction providing high static and dynamic rigidity Upper beam movement supported by fiber slide bearings High-strength balancing shaft and eccentric bearing system supporting parallelism Motor-controlled angle adjustment with a mechanical stroke system inside the cylinder Wide opening and high stroke suitable for use with different dies Easy tonnage adjustment and bottom dead center stop via NC control Hydraulic safety system against overpressure Dual-speed operating system consisting of free descent, bending, and fast return CE-compliant, multi-functional foot pedal with emergency stop Compact hydraulic power unit, top-mounted, with HAWE or Rexroth components Siemens, Pizzato, and Balluff electrical components LEUZE safety system and learning mode NC control unit with 500 programs and 200 lines per program Program transfer via USB Standard upper and lower die set NC-controlled motorized X-axis back gauge (500 mm) Back gauge system with linear slides 0.2 mm positioning accuracy Motor-controlled Y-axis angle adjustment Mobile control panel Front support arms with linear slides Lower die centering bolts Programmable, precise back gauge retraction function Ljdpfx Afezcl S Noujac Optional Equipment Motorized R-axis Special bending dies Special pedal system with dual-hand + foot control DSP or Fiessler safety systems Extended back gauge distance Additional back gauge fingers Additional front support arm Manual crowning system Motorized crowning system Technical Specifications Bending Force: 30 tons Maximum Bending Capacity: 4 mm Bending Length: 1270 mm Distance Between Columns: 1010 mm Stroke: 150 mm Bending Speed: 10 mm/s Free Descent Speed: 70 mm/s Throat Depth: 255 mm Distance Between Upper and Lower Dies: 265 mm Table Width: 130 mm Table Height: 830 mm Main Motor Power: 3 kW X-Axis Motor: 0.55 kW Y-Axis Motor: 0.18 kW Optional R-Axis Motor: 0.25 kW Back Gauge Distance: 500 mm Oil Tank Capacity: 90 L Machine Length: 1780 mm Machine Width: 1375 mm Machine Height: 2160 mm Machine Weight: 1700 kg Country of Origin: Turkey Manufacturer: CRONOSSTECH Makina

Condition: new, Year of construction: 2026, power: 4 kW (5.44 HP), pressing force: 60 t, stroke length: 210 mm, operating speed: 10 mm/s, reverse speed: 120 mm/s, throat depth: 410 mm, ram plate length: 1,250 mm, Equipment: CE marking, documentation/manual, safety light barrier, HPB A60-1250 – 60 Ton x 1250 mm CNC Hydraulic Press Brake The HPB A60-1250 CNC Hydraulic Press Brake, manufactured in Turkey by CRONOSSTECH, is designed for precision sheet metal bending applications, offering a bending force of 60 tons and a bending length of 1250 mm. Thanks to the ESA S630 CNC control unit, servo-motor driven back gauge system, compact frame structure, and professional tooling equipment, it provides high precision and efficiency for workshops, metal processing companies, and industrial manufacturers. Standard Features Stroke: 210 mm Daylight (Bottom – Top Die Gap): 415 mm Throat Depth: 410 mm Bending Length: 1250 mm Distance Between Columns: 1100 mm ESA S630 CNC Control Unit (3-4 Axes) 10” 2D Touchscreen Graphic Display Manual bending sequence and collision control calculation Angle correction calculation (Crowning) Angle measurement and correction 2D drawing support 2 USB ports Offline programming software CT-BEND Servo Motorized X-Axis Back Gauge System X-axis travel distance: 750 mm Speed: 130 mm/sn Accuracy: ±0.10 mm Manual R-axis movement: 190 mm Steel frame construction Hardened ball screw spindle Hardened linear slide system Optional 1000 mm X-axis Back Gauge Fingers 2 pieces Straight type 3-stage (10 mm / 20 mm / 30 mm) Manual Z-axis movement Structure to prevent sheet metal sagging European Type Manual Promecam Upper Die Holder E7 Quick tool change Safe operation Structure to prevent die fall CRONOSSTECH Special Narrow Lower Table 70 mm or 90 mm lower table T-slot can be applied upon request Standard Upper Die ES1260 Die height: 67 mm Die angle: 85° Radius: 0.8 mm Material: C45 Maximum capacity: 100 Ton/Meter Amada compatible Standard Lower Die ES2067 4-channel V-opening (16-22-35-50 mm) Die height: 60 mm Die angle: 85° Material: C45 Maximum capacity: 80 Ton/Meter Amada compatible A Series Open Cabinet Design CRONOSSTECH Premium open cabinet Wide field of view Ergonomic design Professional appearance Additional Equipment Single pedal system (P2) GIVI linear scales Upper beam LED lighting Electrical panel according to VDE standards Schneider or Siemens electrical equipment Hoerbiger (HAWE) hydraulic block Eckerle hydraulic pump Energy-saving Standby function Front Support Arms 2 standard sliding front support arms Height adjustable Scale measurement system Supports the operator Optional Features AKAS II Front Safety Laser System + PLC + Rear Light Curtains Finger protection system Laser-based safety system Increases operator safety CE compliance Maximum working distance: 4.3 meters Technical Specifications Bending Force: 60 Ton Bending Length: 1250 mm Distance Between Columns: 1100 mm Stroke: 210 mm Daylight (Bottom – Top Die Gap): 465 mm Throat Depth: 410 mm Table Height: 885 mm Machine Length: 3060 mm Machine Width: 2195 mm Machine Height: 2730 mm Approach Speed: 150 mm/sn Ledezbyu Nepfx Afuoac Return Speed: 120 mm/sn Bending Speed: 10 mm/sn Oil Tank Capacity: 95 L Machine Weight: 3400 kg Main Motor Power: 4 kW Back Gauge X-Axis Speed: 300 mm/sn Back Gauge R-Axis Speed: 250 mm/sn This machine is manufactured in Turkey by CRONOSSTECH. 🇹🇷

Condition: new, Year of construction: 2026, power: 4 kW (5.44 HP), pressing force: 40 t, stroke length: 210 mm, operating speed: 10 mm/s, reverse speed: 120 mm/s, throat depth: 410 mm, ram plate length: 1,250 mm, Equipment: CE marking, documentation/manual, safety light barrier, HPB A40-1250 – 40 Ton x 1250 mm CNC Hydraulic Press Brake The HPB A40-1250 CNC Hydraulic Press Brake, manufactured in Turkey by CRONOSSTECH, is designed for precision sheet metal bending applications, offering a bending force of 40 tons and a bending length of 1250 mm. Thanks to the ESA S630 CNC control unit, servo motor-driven back gauge system, compact body structure, and professional tooling equipment, it provides an efficient solution for workshops, metal processing companies, and industrial manufacturers. Standard Features Stroke: 210 mm Distance between Upper and Lower Dies (Daylight): 465 mm Throat Depth: 410 mm Bending Length: 1250 mm Distance Between Columns: 1100 mm ESA S630 CNC Control Unit (3-4 Axes) 10” 2D Touchscreen Graphic Display Manual bending sequence and collision control calculation Angle correction calculation (Crowning) Angle measurement and correction 2D drawing support 2 USB ports Offline programming software CRONOSS Servo Motorized X-Axis Back Gauge System X-axis travel distance: 750 mm Speed: 130 mm/s Accuracy: ±0.10 mm Manual R-axis movement: 190 mm Steel body construction Hardened ball screw Linear guide system Optional 1000 mm X-axis Back Gauge Fingers 2 pieces Flat type 3-step (10 mm / 20 mm / 30 mm) Manual Z-axis movement European Type Manual Promecam Upper Die Holder E7 Quick tool change Safe operation Structure preventing the dies from falling CRONOSS Special Narrow Lower Table 70 mm or 90 mm lower table T-slot can be applied upon request Standard Upper Die ES1260 Die height: 67 mm Die angle: 85° Radius: 0.8 mm Material: C45 Maximum capacity: 100 Ton/Meter Standard Lower Die ES2067 4-channel V-opening (16-22-35-50 mm) Die angle: 85° Die height: 60 mm Material: C45 Maximum capacity: 80 Ton/Meter A Series Open Cabin Guarding CRONOSS Premium open cabin Wide field of vision Ergonomic design Professional appearance Single Pedal System (P2) Encoder Linear Scales Upper Beam LED Lighting VDE Electrical Panel Schneider or Siemens Electrical Components Hoerbiger (HAWE) Hydraulic Block Eckerle Hydraulic Pump Energy-Saving Standby Function 2 Sliding Front Support Arms Height adjustable Scale measuring system Operator support system Optional Features AKAS II Front Safety Laser System + Rear Light Curtains AKAS® II laser safety system Finger protection system Laser protection in line with the upper die Increases operator safety CE conformity Maximum working distance: 4.3 meters Technical Specifications Bending Force: 40 Tons Bending Length: 1250 mm Distance Between Columns: 1100 mm Stroke: 210 mm Daylight: 465 mm Throat Depth: 410 mm Table Height: 885 mm Machine Length: 3060 mm Machine Width: 2195 mm Machine Height: 2730 mm Approach Speed: 150 mm/s Return Speed: 120 mm/s Bending Speed: 10 mm/s Oil Tank Capacity: 95 L Machine Weight: 3400 kg Main Motor Power: 4 kW Back Gauge X-Axis Speed: 300 mm/s Ledpfxozbrcrj Afueac Back Gauge R-Axis Speed: 250 mm/s

Condition: new, Year of construction: 2026, power: 5.5 kW (7.48 HP), pressing force: 40 t, stroke length: 160 mm, operating speed: 10 mm/s, reverse speed: 90 mm/s, throat depth: 320 mm, Equipment: CE marking, documentation/manual, safety light barrier, HPB NC 40-1550 – 40 x 1550mm Ton NC Hydraulic Press Brake The HPB NC 40-1550 Hydraulic Press Brake, manufactured in Turkey by CRONOSSTECH, is designed for precision sheet metal bending applications, featuring a bending force of 40 tons and a bending length of 1550 mm. Thanks to its compact structure, NC-controlled axes, steel body providing high rigidity, and user-friendly control system, it offers an efficient solution for workshops, metal processing companies, and industrial manufacturers. Standard Features Stroke: 160 mm Daylight Opening: 380 mm Throat Depth: 320 mm Bending Length: 1550 mm Distance Between Columns: 1260 mm Double-cylinder upper beam structure Steel body and upper beam providing high static and dynamic rigidity Adjustable upper beam system with fiber slide support High-strength balancing shaft and eccentric bearing system supporting parallelism Motor-controlled angle adjustment with mechanical stroke system inside the cylinder Wide stroke and daylight opening suitable for using different tools Easy tonnage and bottom dead center adjustment via NC control Hydraulic safety system against overpressure Dual-speed operating system (free fall, bending, fast return) Multi-functional foot pedal with emergency stop, compliant with CE standards Top-mounted hydraulic power unit with HAWE or REXROTH components SIEMENS, PIZZATO, and BALLUFF electrical equipment LEUZE safety system and learning mode NC control unit with 500 programs and 200 lines of memory per program USB data uploading and backup feature Standard upper and lower tool set NC-controlled motorized X-axis back gauge system 500 mm travel distance 0.2 mm positioning accuracy Motorized Y-axis angle adjustment Mobile control panel Front support arms with linear slides Bottom die centering and fixing bolts Programmable precision back gauge function Optional Features Motorized R-axis Special bending tools and dies Double-hand + foot controlled special pedal system DSP or FIESSLER safety systems Extended back gauge system Additional back gauge fingers Additional front support arm Manual crowning system Motorized crowning system Technical Specifications Bending Force: 40 Tons Bending Capacity*: 4 mm Working Length: 1550 mm Distance Between Columns: 1260 mm Stroke: 160 mm Bending Speed: 10 mm/s Fast Lowering Speed: 90 mm/s Throat Depth: 320 mm Daylight Opening: 380 mm Table Width: 100 mm Bottom Table Height: 845 mm Main Motor Power: 5.5 kW X-Axis Motor Power: 0.75 kW Y-Axis Motor Power: 0.37 kW Lasdjzbq U Hspfx Afujc R-Axis Motor Power (Optional): 0.25 kW Back Gauge Distance: 600 mm Oil Tank Capacity: 120 L Machine Length: 2000 mm Machine Width: 1600 mm Machine Height: 2235 mm Machine Weight: 3450 kg This machine is manufactured in Turkey by CRONOSSTECH. 🇹🇷

Condition: used, Year of construction: 1985, core drilling diameter max. 18 mm bore depth 320 mm Laedpet Hwvaefx Afuoc swing diameter mm total power requirement 33 kW weight of the machine ca. 6 t dimensions of the machine ca. m

Condition: good (used), Year of construction: 1999, Approx. 23 units of OTTO hazardous goods containers, 600L, Large Packaging "IBC" – used: Price per unit ex-location: €395 (net)! Manufacturer: Otto Containersysteme GmbH Model: 11A/X/01/99/D/OTTO/BAM 0356/2556/1090 Serial number: 33782 Year of manufacture: 1999 Capacity: 600L Tank material: St. W 24 Maximum permissible gross mass: 1,090 kg Tare weight: 190 kg With certification as Intermediate Bulk Container (IBC) for national (GGVS/GGVE/GGVS) and international (ADR/RID/IMDG Code) transport of dangerous goods of packaging groups I, II + III (X rating) * Dimensions per DIN 30741 * Steel container, hot-dip galvanized Lodpfx Aewzyn Dofueac * With hinged, lockable lid * Lid locks in place by special spring mechanism at any opening angle up to approx. 70° * Container with continuous body, only 2 closures on the front * With forklift pockets, safety hooks for PE bags, type plate and compartment Condition: good Available: immediately Location: D-06766 Bitterfeld-Wolfen

Condition: used, Year of construction: 1994, Dürselen 2-spindle drilling machine Good condition Available at short notice Lajdpfxeyf Hzds Afusc

Condition: good (used), Year of construction: 2014, lifting height: 10,000 mm, fuel type: electric, color: red, Drivetrain Drive: Wheel Weights Empty weight: 2.580 kg Functional Lifting capacity: 320 kg Working height: 1.200 cm CE mark: yes Maintenance, history and condition Number of owners: 1 Technical condition: good Visual appearance: good Other information Remanufactured: Yes Delivery terms: EXW Transport dimensions (LxWxH): 2,48x1,18x2,47 Latest inspection: 2025-10-13 Additional information Ljdpfx Asxpc Aqefujac Please contact Rothlehner Arbeitsbühnen GmbH for more information

Condition: excellent (used), Year of construction: 2006, CNC WORKING LINE FOR DOOR FRAMES, comprising: 1 HORIZONTAL LOADING TRANSFER MOTORIZED, model 0190 T.C Loading buffer with horizontal transversal belts and motorized rollers with variable speed control. 1 gasket insertion unit on a horizontal groove, consisting of: - 2 motorized gasket roll holders - 1 pressure roller insertion unit - 1 cutting unit positioned near the end of the profile 1 cutting/drilling machine for finished cuts, model 01TFRD SPECIAL, referencing the upper workpiece. Suitable for cutting, drilling, milling, and hinge (anuba) insertion on door jambs. MACHINE CONFIGURATION: Worktable constructed of a solid steel frame, with a fixed left section and a movable right section. Electronically controlled positioning system, supporting a total of 6 machining units: 2 on the right, 2 on the left, and 2 on the upper bridge. 1 CENTRAL MOTORIZED SHUTTLE with CNC control for milling the ends of jambs. 1 HORIZONTAL RADIAL CUTTING STATION, 0-45°, quick tilting with selector, featuring 2 groups (one per side). Each side with its own motor, including a timed entry system to prevent double cutting positions. Cutting motor power: 5 HP – 3000 rpm – inverter-controlled. Cutting blade bore: 30 mm. Saw blade diameter: 370 mm. Adjustable extraction hoods and safety guards. 1 HORIZONTAL HEAD DRILLING STATION 0-45°, fast vertical tilt with selector, with 2 groups (right and left). 2 HP motor, 3000 rpm. 7-spindle drilling head with 32 mm pitch. Individually selectable spindles. Groups travel on linear guides for increased speed and drilling accuracy, with longitudinal and vertical adjustment capability. 1 UPPER VERTICAL ROUTING (PANTOGRAPHING) STATION, on a transverse bridge, with 1 motor for counterplate slotting, 2 HP, 12,000/18,000 rpm. Vertical, horizontal, and depth (x-y-z axis) movements are CNC-controlled, utilizing precision linear guides and recirculating ball carriages. Equipped with tool holder collet. 1 HORIZONTAL ANUBA DRILLING STATION, with 1 CNC-positioned motorized unit moving in conjunction with the router. Includes a drilling unit, custom Anuba inserting unit, and custom Anuba feeder with approx. 35 piece capacity (depending on Anuba diameter). 1 LINE CONTROL COMPUTER Capable of importing data (CSV or ASCII) via MMC (Memory Card). Note: The imported data will be used for automatic positioning and execution of processing steps as per the job list. Workpiece dimensions: Minimum length: 580 mm (45° internal for frame) Maximum length: 3000 mm (45° external for frame) Minimum thickness: 30 mm Lajdpfx Afoygcmfjujc Maximum thickness: 60 mm Minimum width: 75 mm Maximum width: 300 mm

Condition: good (used), Year of construction: 2010, Used Trumpf PB 30160 CNC press brake Type: PB 30160 Capacity: 3200 x 160 tons Delem DA56 CNC control Y1, Y2, X, and R axes CNC controlled CNC hydraulic crowning Ledpfxszfpkyj Afuoac Upper beam servo hydraulics Panasonic servo motors on the rear stroke 1 set of tools included

Condition: used, Year of construction: 2015, The Stago PB 2015 is a professional paper drilling machine that impresses with precision and durable construction, designed for use in print shops and bookbinding facilities. Key Features: - The Stago PB 2015 offers a user-friendly control panel and quick conversion for different paper formats. - The machine is distinguished by its high drilling capacity for thick stacks and adjustable drilling positions. Its solid construction and low-maintenance mechanics make it ideal for daily professional use. Technical Specifications: Laedpfxjxmgn Es Afuoc - Drill diameter to 15 mm - Maximum pile height: up to 50 mm - Drilling speed: up to 1,200 drillings per hour - Adjustable paper stops for precise positioning - Robust motor and durable drilling tool All-Inclusive Service Package We take care of everything: from secure packaging and transportation to customs clearance. Upon request, we can also provide a customized leasing offer. Sustainable and Economical Choose a used machine and benefit twice: Save the environment and your budget. Despite possible signs of use, you receive a quality product at an attractive price.

Condition: ready for operation (used), Rexroth HCS01.1E-W0005-A-03-B-ET-EC-PB-S4-NN-FW IndraDrive Cs MNR: R911344555 SN: 7260405435793, used, normal signs of use, 100% functional, scope of delivery as per photos Ljdoryiqfopfx Afueac

Condition: ready for operation (used), Heidenhain Id. 324 952-01 interface board SN: 7271755, inspected, tested, 100% functional with 3 months warranty, scope of delivery as per photos. Lasdpfx Aey Nqf Aofujc

Condition: new, Heidenhain ROD 420 1024 01 -03 . 295281-81 rotary encoder without connector, serial number: 11463528A / B4, unused in opened original packaging, 100% functional, scope of delivery as per photos. Laedpsy Nqpuefx Afujc

Condition: new, Rexroth CSH01.1C-PB-ENS-NNN-NNN-S2-S-NN-FW MNR: R911328093 SN:7260406036068, unused, 100% functional, scope of delivery as per photos Lasdpfx Afol Eci Houjc

Condition: ready for operation (used), Heidenhain Id. 359 002-01 interface board SN: 12727718A, inspected, tested, 100% functional with 3 months warranty, scope of delivery as per photos. Lsdpfey Nqgajx Afuoac

Condition: new, Rexroth CSB01.1C-PB-ENS-NNN-L1-S-NN-FW Profibus, serial number: 7260111073641, unused, in original packaging, 100% functional. Lodpfxsi Ecqhs Afuoac