Used Cnc Borer for sale (8,371)

Year of construction: 2025, condition: new, This is a state-of-the-art CNC machine dedicated to the industrial sector, used for cutting sheets and profiles, using a plasma torch. The machine is characterised, among other things, by a robust structure made of the highest quality steel and aluminium, a large cutting range, the possibility of cutting workpieces of any shape and low process costs. The high-end solutions used in production ensure reliable and safe operation. The cutting of the material is carried out in a short time, while maintaining the precision of the workpiece. In order to obtain the desired shape, it is only necessary to import the file into the software, so operation of this cutting machine is easy and intuitive. Our plasma cutting machines are primarily designed to process materials such as: - Black steel, - Stainless steel, CONSTRUCTION The frame of the plasma cutting machine is designed and manufactured from scratch in our factory. The high quality steel used for the machines is cut, then welded and machined. The entire frame, gantry and gantry arms have additional ribbing to achieve high rigidity and eliminate vibration and deformation. DRIVES Servo AC motors with high resolution and power have been used to drive our cutters, ensuring adequate acceleration and speed in each direction. These are highly dynamic and precise motors with feedback, guaranteeing zero defect by continuously controlling the operating parameters. The X and Y axes use classic and well-proven helical bars, which ensure long life and precision. FUEL Our plasma machines use components from the leading manufacturer PGCNC. The technologies used in the torch significantly increase productivity and cutting speed. HD technology provides better hole quality, increased piercing capacity and bevelling capabilities. This ensures high quality, repeatable cuts and maximises productivity with minimal running costs and reliability. KNIFE TABLE The knife table is made with technology that is resistant to working at elevated temperatures. This allows us to work continuously without worrying about the occurrence of burn-outs that prevent the material from being evenly positioned on the work table. The positioning of the scissors can be easily changed according to the size of the workpieces to be burnt. The knife table is an excellent solution for cutting thicker materials. Hfsdpfx Ajiqn Uujg Non SOFTWARE The machine is equipped with Starfire 2D CAD/CAM software. Various functions are available to the user, including the ability to import finished designs in vector formats: .dxf, .plt, .ai, .eps. The programme ensures fast and precise development of cutting paths. PLASMA SOURCE The basic plasma equipment includes the 120A cutting system, which is characterized by high productivity and cutting quality and speed. AUTOMATIC LUBRICATION SYSTEM Plasma cutting machine equipment also includes an automatic lubrication system that minimizes machine maintenance. The central lubrication system is a simple and functional device used to supply grease to the places where machine and equipment components come into contact. - POWER 400V 50Hz - MAX SPEED 45 m/min - DOOR SHAPE 200-600 mm - TYPE OF WORKING TABLE Knife table - WORKING TABLE WEIGHT 500 kg/m2

Condition: ready for operation (used), functionality: fully functional, CNC dividing head with stepper motor control, - Divisions from 1-999 possible - Odd divisions also possible Hfjdswmd Iropfx Ag Njn - Ideal for face grinding, divisions – saws with high tooth pitch, or even slow cylindrical grinding of circular knives - Can be retrofitted to any tool grinding machine - Rotatable, pivotable in all directions, horizontally and vertically - Easy installation on the machine table using T-nuts - Can also be supplied with a small mounting angle - Center height 190 mm or 140 mm measured from the machine table. - CNC dividing head available with MT5 chuck or SK 40 chuck - Division is triggered via foot switch or optionally a simple contact/switch, etc. on the machine table can be triggered - The division process can be fully automated with the hydraulic machine table or linked via the CNC machine control system. New price: €12,800

Year of construction: 2000, condition: excellent (used), SMS MEER CNC DOUBLE SIDED CHAMFERING MACHINE Manufacturer: SMS MEER Type: RFA 14 Yom: 2000 Working range: tube Ø 21,3 – 114,3 mm Wall thickness 2,3 - 11 mm Length: 6-12m Hfedpfxeghrgus Ag Nsn Composed of two RFA14 chamfering machines with transport devices between the machines. The task of machines is to chamfer inside and outside both ends of the tubes. The range of diameters of chamfered tubes 21.3-114,3mm and wall thickness of 2.3-11mm in the length range of 6-12m. The task of transport in the area of the chamfering machines is to collect the tubes from the roller table and move them between the chamfering machines.

Condition: excellent (used), For sale: Professional clamping chuck from the renowned brand HOLEX – a robust and reliable solution for CNC machining centers. • Type: SK40-2/20-100 • Clamping system: ER32 (interchangeable collets) • Length: 100 mm • Maximum torque: 170 Nm Hjdsw S Iw Hopfx Ag Nofn • Spindle speed: up to 12,000 rpm • High-quality construction – precise clamping of shank tools • Condition: used, in very good technical condition Ideal for securing drills, milling cutters, taps, and other shank tools. The HOLEX brand is a line from the German Hoffmann Group, ensuring quality and durability at a reasonable price.

Condition: as good as new (ex-display), Number: AAL 130426 Length: 1,000 mm Storage diameter: 170 mm Cone intake: 46 to 64 mm diameter 70 mm length Hedod Nlagopfx Ag Nsfn Speed: 8,000 U/min Condition: Unused Use: For large Chevalier grinding machine FSG 2460 CNC

Condition: new, Year of construction: 2024, Professional CO2 laser with a 600mm x 900mm work table and a tube with a rated power of 80W reaching 90W at peak! The standard equipment includes a CW5000 liquid cooler, a compressor for blowing the lens and material, and a smoke extractor. Model: 6090G Working area: 600x900mm (pass-through table in the Y axis) Rated laser power: 80W Laser power at peak: 90W Tube type/laser type: Glass CO2 laser tube Cooling type: Closed-circuit water cooling - CW5000 cooler Max. engraving speed: 800mm/s Suggested max. cutting speed: 400mm/s Max. Cutting thickness: up to 15mm depending on material and parameters Min. engraving size for letters: 1mm x 1mm Engraving precision: 2500DPI Repeatability: +-0.01mm Hjdpfjtvmh Dox Ag Nofn NEW – Controller and motherboard: Ruida RDC6445G - a module with advanced functions providing advanced control over parameters and the processing process Supported graphic forms: DST, PLT, BMP, DXF, DWG, AI, LAS, etc. Supported interface: WiFi, USB Color separation: Yes Drive system: Hybrid closed-loop stepper motors with high holding torque by LEADSHINE 15mm linear guides by PMI Standard equipment: PURI 80-90W laser tube Fume extraction and piping CW5000 cooler Table knife rigid, stable steel honeycomb table Blowing compressor Power source: 230V, 50-60Hz Working environment: Temperature 0-45oC, Humidity 5-95% (non-condensed) Weight 209.65 kg + accessories ~ 20 kg Dimensions: 142x120x105 cm Machine designed for cutting and engraving in materials such as: Acrylic, leather, rubber (e.g. stamps), wood, wood derivatives, plastics, textiles, clothing, leather, glass (engraving only), marble/stones (engraving only, cardboard, ceramics (engraving only), paper, etc., coated metals (e.g. pens).

Year of construction: 2025, condition: new, FIBER CUT laser cutting machines are a revolutionary solution in the laser cutting market. Innovative fibre laser technology allows much faster, more efficient and cheaper cutting of sheet metal parts compared to CO2 lasers. The cutters are characterised by high speeds, productivity and exceptional cutting accuracy. They provide unrivalled precision and repeatability. Our fibre lasers are primarily designed for processing materials such as: - Independent metals - Aluminium - Stainless steel - Carbon steel SOURCE POWER 3000W CONSTRUCTION The frame of our laser is designed and manufactured from scratch in our factory. The high-quality steel used for the machines is cut, then welded and precision-machined. The entire frame, gantry and gate arms have additional ribbing to achieve high rigidity and eliminate vibration and deformation. DRIVES High-resolution, high-power Schneider AC servo system motors (Y1Y2 x 2000W, x 1500w, z 400W) have been used to drive our machine tools, ensuring adequate acceleration and speed in each direction. Drive transmission is via high-performance planetary gears. The X and Y axes use the classic and proven helical slats, which ensure long life and precision. HEAD Hfedjiqpanopfx Ag Nsn A liquid-cooled, WSX head is used for cutting sheet metal. A high-performance quartz glass lens focuses the diffused laser beam on the material to be cut, ensuring high cutting accuracy. For the process to proceed correctly, the HSU system adjusts the head height taking into account material irregularities. A safety window located between the nozzle and the lens protects the lens unit from splinters of molten metal. LASER SOURCE The laser uses a Raycus Laser light source with high electro-optical conversion efficiency, low power consumption and high beam quality. In addition, it allows faster and more efficient operation and contributes to the elimination of operator errors. In addition, the source is resistant to backscattering, i.e. the beam returning to the laser. Good power stability ensures efficient working while consuming low energy. COOLING The S&A CWFL industrial dual-temperature units are specially designed for cooling fibre lasers. They have multiple alarm functions: compressor time delay protection, compressor overcurrent protection, water flow alarm and high/low temperature alarm. INTERCHANGEABLE WORKTABLE The interchangeable work table located at the rear of the machine reduces laser downtime to a maximum. Automatic table replacement takes just 10 seconds. This gives the operator time to take the cut parts from the table and load a new sheet while the laser is working on the other table. This system ensures a very high production flow. AUTOMATIC LUBRICATION SYSTEM To keep the machine in good condition - the gears and guides need to be lubricated with oil at most every few days. An automatic system starts the lubrication every specified time and in the correct amount, and all parameters are set in the software.

Condition: ready for operation (used), Year of construction: 2005, operating hours: 9,400 h, functionality: fully functional, machine/vehicle number: 8662, turning length: 380 mm, turning diameter: 400 mm, spindle bore: 55 mm, spindle speed (max.): 5,000 rpm, spindle speed (min.): 100 rpm, travel distance X-axis: 160 mm, travel distance Y-axis: 440 mm, travel distance Z-axis: 380 mm, spindle motor power: 11 W, rapid traverse X-axis: 20 m/min, rapid traverse Y-axis: 12 m/min, rapid traverse Z-axis: 20 m/min, total height: 1,900 mm, total length: 3,500 mm, total width: 1,650 mm, type of input current: three-phase, overall weight: 3,300 kg, bar passage: 45 mm, spindle nose: ASA 5", coolant pump power: 75 W, tailstock quill diameter: 85 mm, number of tool stations in tool turret 1: 12, Equipment: documentation/manual, Biglia B301 CNC Lathe – Used and Refurbished, in Excellent Condition Year 2005, used and overhauled, ideal for precision machining of small and medium components. A compact, reliable, and robust machine equipped with a bi-directional 12-position turret, hydraulic tailstock, and hinged chip conveyor. Perfect for machine shops and companies seeking a high-quality CNC lathe, fully operational and ready for use. Main technical specifications: - Model: Biglia B301 - Year: 2005 Capacity: - Max swing diameter: 400 mm - Max bar working diameter: 45 mm - Max chuck working diameter: 220 mm - Max machining length: 380 mm Spindle: - Spindle nose: ASA 5” - Spindle bore: 55 mm - Chuck: 3-jaw Autoblok 210 BH Hfedpjvw Agvefx Ag Njn - Spindle speed: 100 – 5,000 rpm - Spindle motor power: 11 – 15 kW Travels: - X-axis travel: 160 mm - Z-axis travel: 380 mm - B-axis travel: 440 mm Rapid traverses: - X/Z axes rapid speed: 20 m/min - B axis rapid speed: 12 m/min Turret and tailstock: - Turret: bi-directional, 12 stations - Automatic tailstock: yes - Quill diameter: 85 mm - Taper: MT4 Weight and dimensions: - Machine weight: 3,300 kg - Dimensions: 3,500 × 1,650 × 1,900 mm (h) Included accessories: - Hinged chip conveyor - 12 static tool holders - Finished parts catcher Condition and availability: - Refurbished, tested used machine in perfect operating condition - Ready for delivery - Inspection available by appointment at our premises Ideal for: Precision machining, serial production, and applications involving steel, brass, aluminum, and engineering plastics.

Condition: new, functionality: fully functional, controller model: DSP A11 control system, workpiece length (max.): 2,500 mm, workpiece width (max.): 1,300 mm, workpiece height (max.): 200 mm, spindle motor power: 4,500 W, type of input current: three-phase, Main Specifications: # Working size: 1300x2500x200mm # 4.5kw HQD air cooling spindle, 18000RPM, ER32 collet # 5.5kw Fuling inverter # DSP A11 control system # Stepper motor and drivers # Taiwan square linear guide rail, #20 # T-slot and vacuum working table # 7.5kw air cooling vacuum pump # 3kw double bags dust collector # Heavy-duty machine body # Voltage: 380V, 3PH, 50HZ Hfjdpfx Agjwnimce Njn # Automatic lubrication system # Automatic tool sensor # Blue-White color

Condition: excellent (used), HOLEX SK40 collet chuck for ER collets – robust design, ideal for use on CNC machining centers. Hodsw S Itbopfx Ag Nsfn • Type SK40 – DIN 69871 • ER collet (diameter Ø16 mm) • Chuck lengths: 70 mm, 100 mm, 110 mm (depending on model) • Max. speed 12,000–15,000 rpm • Torque up to 70 Nm • Balancing class G6.3 – stable operation at high speeds • Brand HOLEX – Hahn+Kolb Germany • Very good, warehouse condition • Available individually or as a larger set

Condition: good (used), Year of construction: 2003, travel distance X-axis: 630 mm, travel distance Y-axis: 500 mm, travel distance Z-axis: 500 mm, Tool magazine is not in operation !!! Hodjr H D Akspfx Ag Njfn

Condition: like new (used), Year of construction: 2020, functionality: fully functional, CUT 2530S - Variable CNC Machine EPS cutting machine with 4 independent moving axes and variable machine table. Hfodpfx Agjwfdm Ee Nsn

Condition: good (used), Cutting table for divided tape measures Hfjdpst Iflrofx Ag Njn • Complete line available • Fully automatic float glass cutting table from Hegla, manufactured by Laser, was purchased by Hegla, and spare parts are available from Hegla. • The table can also cut shapes, particularly suitable for small dimensions. All data can be optimized and entered on the computer; the program is installed on the PC that is included. • Glass thicknesses from 2-15 mm • Maximum glass size 2250 x 3300 mm • Breaking table with breaker bars

Condition: as good as new (ex-display), Year of construction: 2018, operating hours: 200 h, functionality: fully functional, machine/vehicle number: 1421160-BV40058101, turning length: 300 mm, turning diameter: 240 mm, spindle bore: 61 mm, spindle speed (max.): 3,500 rpm, travel distance X-axis: 190 mm, travel distance Z-axis: 400 mm, spindle motor power: 11 W, rapid traverse X-axis: 18 m/min, rapid traverse Z-axis: 24 m/min, total height: 1,880 mm, total length: 2,860 mm, total width: 1,700 mm, overall weight: 3,400 kg, bar passage: 42 mm, CNC Lathe Takamaz XL-150M – showroom demonstration machine, with almost zero operating hours, has never machined any material. The machine is in excellent condition, year 2018, essentially as new. Equipped with Fanuc CNC, live tooling, and numerous accessories. Main data: Year of manufacture: 2018 Serial number: 1421160-BV40058101 CNC: FANUC Series Oi – TD Max swing diameter: 280 mm Max turning diameter: 240 mm Max turning length: 300 mm Bar capacity: 42 mm Spindle bore: 61 mm Spindle: 3-jaw chuck SMW AUTOBLOK Ø 210 mm ASA A2-8 spindle nose Spindle nose height: 1050 mm Bearing internal diameter: 100 mm Spindle speed: up to 3500 rpm Axes: X-axis travel: 190 mm Z-axis travel: 400 mm Rapid traverse rates: X 18 m/min – Z 24 m/min Turret and tools: 12-position turret Internal/external tool holder 25x25 mm Boring bar holder Ø 32 mm Indexing: 0.1 sec Live tools up to 4000 rpm Motors and power: Spindle motor: AC 11/7.5 kW X-axis servomotor: 1.2 kW Z-axis servomotor: 1.8 kW Max absorbed power: 24 kW Dimensions and weight: Footprint including chip conveyor: 2860 x 1700 x 1880 mm Net weight: 3400 kg Standard accessories: Right-side belt-type chip conveyor No. 1 axial driven tool holder No. 1 radial driven tool holder No. 6 static tool holders (2 boring bar holders + 4 tool holders) Included documentation: Lathe instruction manual Programming manual EC Declaration of Conformity Condition like new – machine available immediately. Hfedpfjvw Ahyjx Ag Non

Condition: new, Year of construction: 2025, The Open CNC HM-100 is the compact model within the TX series and has been developed to meet the growing demand for smaller, rigid and accurate CNC machines for production environments. This machine is specifically designed for users who place high demands on speed, efficiency and precision. While the TX series is optimized for machining large workpieces and automated applications, the HM-100 is perfectly suited for manufacturing smaller workpieces, with the same level of accuracy and reliability. Working range X: 300 mm – 1300 mm (customization possible) Working range Y: 300 mm – 1300 mm (customization possible) Working range Z: 100 mm (customization possible) Input voltage: 220V/380V Software Control : Included Servo motors: 400W Accuracy: 0.05 – 0.1 mm Movement speed: 5000 mm/min Machine table : Included Vacuum bed : Optional Automatic tool change : Optional Hfodpfewm H Ihex Ag Nen Milling motor: 1.5 kW / 2.2 kW

Condition: excellent (used), For sale: CNC tool holder GARANT (Hoffmann Group) – model SK40-16-100. High-quality clamping system for milling machines and machining centres, ideal for precision metalworking. • SK40 taper – industrial standard • Clamping diameter Ø16 mm • Length 100 mm • Balancing G2.5 – up to 25,000 rpm • Max. tightening torque 50 Nm • Premium brand – GARANT (Hoffmann Group) • Very good condition, used, fully functional – equipped with cutters/drills. Hedpow Sy Epsfx Ag Njfn -- PRICE IS FOR 1 PIECE --

Condition: good (used), Year of construction: 2017, CNC Speedform Rapidcleaner for automated depowdering of 3D-printed parts produced with powder bed fusion technologies (SLS, MJF, SAF). Features (manufacturers spec): Up to several thousand parts per operation, depending on size and geometry Extremely short processing time: 1-10 minutes Fully automated blasting with micro glass beads Absolutely dust-free part quality Perfect cleaning, even with the smallest bore diameters Lowest and optimized blasting material requirement Robust and very low-maintenance system design Suitable for all plastic materials Simple and safe operation Clean separating device Hodpsvuztcefx Ag Nefn Machine operates with 2 blasting nozzles and two nozzles with ionized air. The blasting media is sieved to allow fine control over the media used in the process. Furthermore this machine has an HMI retrofitted which allows to program different recipes with multiple process steps. 2 machines available towards the end of Feb. '25 Keywords: AMT, Dyemansion, AM Solutions, Rosler, Additive Manufacturing Technologies, EOS, HP, Farsoon, 3d printing, selective laser sintering, mjf, multi jet fusion, 3d print, additive manufacturing, eosint, blasting, depowdering, shotpeening

Condition: new, functionality: fully functional, travel distance X-axis: 1,500 mm, travel distance Y-axis: 3,000 mm, travel distance Z-axis: 200 mm, rapid traverse X-axis: 20 m/min, rapid traverse Y-axis: 20 m/min, rapid traverse Z-axis: 20 m/min, workpiece length (max.): 3,000 mm, workpiece width (max.): 1,500 mm, overall weight: 1,500 kg, spindle speed (max.): 24,000 rpm, spindle motor power: 5,500 W, number of spindles: 1, input voltage: 400 V, type of input current: three-phase, CNC portal milling machine Industry 2500 x 1300 Working area: 2500 x 1300 x 200 mm depending on equipment from €11000,- excl. VAT. CNC portal milling machine Industry 3000 x 1500 Working area: 3000 x 1500 x 200 mm Hfedpfjukgwuex Ag Non depending on equipment from €12900,- excl. VAT.

Condition: used, Year of construction: 2020, functionality: fully functional, machine/vehicle number: 19090103008, Equipped with a milling spindle for 3 axes. Additionally fitted with an oscillating tangential knife, upgraded for a fourth axis (rotary axis). Furthermore, two additional tools are installed for performing 45° miter cuts along both X and X axes. Ideal for applications such as acoustic materials, foam materials, PU foam panels, cardboard, etc. Max. knife length: up to 120mm, shank diameter: 6mm. Dimensions: - 2200 x 3600 mm - Travel width (dome): 2440 x 3600 mm Working area for the oscillating knife: - Y direction: 3100 mm - X direction: 2100 mm Working area for the spindle (4.5 kW): - Y direction: approx. 3000 mm - X direction: approx. 2000 mm - Clearance: 200 mm Vacuum table size: 2020 x 3100 mm The machine features a 6-zone vacuum table and a water-cooled pump with a power rating of 5.5 kW (pump dimensions: 1200 x 800 x 1000 mm – to be set up separately). Total machine weight is approx. 1.85 t. - Rack and pinion drive - Oil lubrication system - Stepper motors (step by step) - Spindle speed max. 24,000 rpm – high-frequency, water-cooled - Dust extraction connection Included in delivery is a complete workstation including CAD/CAM software in German, PC, monitor, and keyboard, all ready for immediate operation. Various tools and spare parts are also included. Hfodpfowx E Tgox Ag Njn The machine has been in use since 01/2020 for acoustic material processing and has been regularly maintained. Price: €12,500.00 (excl. VAT), without delivery and installation. The machine is disassembled and ready for collection.

Condition: used, • Type - PARTICA GLP 3000 • Year of manufacture – 2013 • No. GG 1800-0690 • With 3 axes • Many diamond and polishing tools • Dimensions: W 5200 x D 2900 x H 2000 mm • Travel paths approx. 3150x1415 mm • 16-position tool changer • Weight: 4300 kg Very good condition, little use, from a small company. Hsdpfxjv Tya Se Ag Nefn

Condition: new, Year of construction: 2024, functionality: fully functional, spindle motor power: 9,000 W, Are you looking for a Dutch made CNC machine for your hobby or your business? Are you looking for a user-friendly machine that is also affordable? Then take a quick look at the photos or visit our website for the possibilities that our machines offer. Hfedpfx Aernmwljg Nen Functional design: the design is based on experiences of our customers No assembly, the machine is delivered complete Universal accessories such as vacuum systems, automatic tool changer, dust extraction, milling motors, measuring instruments, various safety systems, end machining, drilling units and much more (see website). Machine working range: 1300x2500mm to 2100x4000mm or customization (larger possible) For more information, see our website. If you are interested, please make an appointment at our workshop in Schiedam, the Netherlands.

Condition: excellent (used), Professional tool holders from the renowned brand GARANT (Hoffmann Group). Model 300230 6 SK40-6-100 – clamping diameter Ø6 mm, length 100 mm. • SK40 taper – CNC standard • Clamping diameter Ø6 mm • Holder length 100 mm • Maximum rotational speed 25,000 rpm • High precision and clamping stability • Used, fully functional and ready for work. -- PRICE LISTED FOR 1 PIECE -- Hfsdpfx Aew Sy D Eog Non

Condition: excellent (used), For sale: Wysow 160 mm double vise, designed for milling machines and CNC centers. Robust cast iron and steel construction ensures high rigidity and stability during operation. Jaw width: 160 mm. Jaw opening: 50 mm. Weight: 29.6 kg. Hardened, serrated jaws. The two-part design allows for various configuration setups. Suitable for heavy-duty machining and work on both conventional and CNC milling machines. Good condition, fully functional and ready for work. Hodjw Sfp Tepfx Ag Njfn

Condition: excellent (used), For sale: Professional CNC rotary table from the renowned brand Fadal Engineering (USA, subsidiary of Giddings & Lewis Inc.), model VH65. Equipped with a Röhm ZG Ø125 mm lathe chuck, significantly expanding application versatility. Technical specifications: • Model: VH65 • Table diameter: 165 mm (6.5”) • Ratio: 90:1 • Pneumatic brake (M60 ON / M61 OFF) • Röhm ZG Ø125 mm lathe chuck – max 4000 rpm, torque 80 Nm • Serial number: 6660297 • Industrial multipin connector Condition: used, fully mechanically functional, normal signs of use. Sturdy, heavy-duty construction guarantees precision and long service life. Ready for use as an additional 4th axis in a machining center. Hfjdpfx Agsw R Syio Nen

Condition: excellent (used), For sale: CNC rotary table from the renowned brand Fadal Engineering (USA), model VH65. Professional 4th axis designed for machining centers, especially Fadal VMC, but integration with other CNC machines is also possible using the appropriate controller. Technical specifications: • Model: VH65 • Table diameter: 165 mm (6.5”) • Gear ratio: 90:1 • Pneumatic brake (M60 ON / M61 OFF) • Industrial multipin connector • Serial no.: 4630298 Condition: used, mechanically functional, normal signs of operation. Solid and heavy construction – ideal for precise 4-axis machining. Hjdew R St Nspfx Ag Nefn