Used Sawblade Grinder for sale (1,509)

Condition: like new (used), Year of construction: 2010, Haas Multigrind CB multi axis CNC grinder, Bjdpfx Aov Igg Ieacodi 12 station, Siemens Sinumerik 840D control, load / unload, LTA industrial air cleaning unit, (2010) Full machine specification can be seen on the photographs or can be seen sent via email.

Condition: excellent (used), Year of construction: 2019, Like new, 725 operating hours! Control: SIEMENS 840S sl Grinding spindle: HSK 50, 18,000 rpm, 12 kW Lubrication: Oil mist lubrication on the grinding spindle, central lubrication system throughout T-slot plate for clamping devices on the X-table (7 T-slots 12H7, spaced 50 mm apart) Bdjdpfx Ajw R Tx Hsacei Multigrind Horizon basic version (grinding software) Module: Rotational Symmetry Module: CAD Module: External PC License Tool change wheel CA Standard 1 wheel Combined structure-borne noise and unbalance monitoring Height-adjustable coolant nozzles Coolant system Turboseparator (KSA 700 18) Oil mist extraction Fire extinguishing system Collet chuck SK50/HSK 80 Collet set 3409E D2-16 Hydraulic expansion chuck SK50 D8-32 Sleeve set d32mm D8-30mm 3-jaw chuck d=160mm ACCESSORIES 1x Various sleeves 32/30; 32/25; 32/20; 32/18; 32/12; 32/10; 32/08 1x Magnetic chuck incl. EROW adapter 250/150 6x HSK50E flange mounts 1x Hydro expansion chuck 5x Profile roller diamond tools 1x Collet Ø2; Ø3; Ø4; Ø5; Ø6; Ø8; Ø10; Ø12; Ø16 1x Collet chuck set SK50E/HSK 80 25x Various grinding wheels (new) 1x Calibration ball Miscellaneous ORIGINAL PRICE: €714,000

Condition: excellent (used), Year of construction: 2008, functionality: fully functional, spindle speed (max.): 12,000 rpm, feed length X-axis: 400 mm, feed length Y-axis: 400 mm, feed length Z-axis: 250 mm, type of input current: three-phase, rotational speed (max.): 12,000 rpm, grinding spindle speed: 12,000 rpm, travel distance X-axis: 400 mm, travel distance Y-axis: 400 mm, travel distance Z-axis: 250 mm, grinding spindle motor power: 10,500 W, power: 10.3 kW (14.00 HP), input current: 30 A, input frequency: 50 Hz, input voltage: 400 V, year of last overhaul: 2024, Equipment: rotational speed infinitely variable, For Sale: 2008 Schütte 305 Linear 5-Axis CNC Tool & Cutter Grinder | Siemens 840D | New Spindle | Medical-Grade Machine Now available at Used Machine Tools Ireland Ltd, this high-precision Schütte 305 Linear 5-Axis CNC Tool and Cutter Grinder (2008) is an exceptional solution for tool regrinding, complex geometry grinding, and high-volume production. Previously in operation at a leading medical device company, this machine has been meticulously maintained, with a brand-new spindle installed in 2024. This grinder is fully equipped with modern tooling support systems including fire suppression, Absolent mist extraction, Ebbco coolant filtration, and in-line chiller, making it production-ready for demanding grinding applications. 🔹 Manufacturer: Alfred H. Schütte 📅 Year of Manufacture: 2008 📍 Location: Ireland ⚙️ Condition: Very Good – Ex-medical device use 🚀 Availability: Immediate 🔧 Spindle: Replaced in 2024 🛠️ Technical Specifications: Machine: Schütte 305 Linear CNC Tool & Cutter Grinder Machine Type: 5 Axis CNC Grinder Model: 305 Linear Year: 2008 Control: Siemens 840D with Windows XP Axes: 5-Axis CNC X-Axis Travel: 400 mm X-Axis with Tailstock: 400 mm Y-Axis Travel: 400 mm Z-Axis Travel: 250 mm Spindle Motor Power: 14 HP Bodpfxjw Nyc Ae Aacjdi Spindle Speed: Up to 12,000 RPM Software: SIGS – Schütte Integrated Grinding Software Condition: Very good – Ex-medical device industry Spindle Replaced: 2024 (new) ⚙️ Equipped With: 🔥 Fire Suppression Unit 🌫️ Absolent Mist Extraction System 💧 Ebbco Coolant Filtration Unit ❄️ Ebbco In-line Chiller 🧠 Advanced SIGS Grinding Software 🛡️ New Spindle (2024) 💡 Ideal Applications: Tool & cutter regrinding Custom tooling production Precision carbide & HSS grinding Medical, aerospace, and high-specification manufacturing Schütte 305 Linear for sale Used 5-axis CNC tool grinder Tool and cutter grinder Siemens 840D Schütte SIGS software grinder CNC tool regrinding machine Ireland Schütte tool grinder with mist extraction Medical-grade grinding equipment High-performance cutter grinder 5-axis

Condition: excellent (used), Double-sided grinder Grützmacher GSP10 Working width: 200-1000 mm Working height: 230 mm Number of units: 2 Mechanical oscillation of sanding belts Pneumatic head approach Grinding motor power: 2×7.5 kW Oscillation motor power: 2×0.15 kW Sanding belt: 2500x250 mm Exhaust ports: 2x140 mm Bdodpfx Aaexmgrqscei

Year of construction: 2014, condition: reconditioned (used), HGS 65/32 Bosch 0602208404 0 602 208 404 Straight Grinder Stabschleifer 200Hz 135V 3,3A Bsdpfxsfluubs Aacedi 600W 50mm 18300 1/min 2,4kg some available different conditions: from almost new to used

Condition: like new (used), Year of construction: 2013, Factory overhauled 2025 Bdodpfxoxcpdhe Aacsi Machine stainless steel rust-proof Machine with 200 L hopper and hydraulic feeding system (for 200 L trolley) Worm and worm housing stainless steel rust-proof 2 speeds main worm 2 speeds feeding worm Frozen meat equipment incl. mixing arm (up to –25 °C) and reinforced gearbox (150 / 300 rpm) Electrically interlocked footboard Electrically interlocked safety grid with lifting device Electrically interlocked outlet guard PLC control with push buttons Integrated control cabinet Drive power main worm: 11 / 15 kW, 400 Volt, 50 Hz Drive power feeding worm: 1.0 / 1.4 kW, 400 Volt, 50 Hz

Condition: like new (used), Year of construction: 2012, 12 station, Siemens Sinumerik 840D control, load / unload, VAS air cleaning unit, (2012) Bdjdpfx Asv Igghsacsi Full machine specification can be seen on the photographs or can be seen sent via email.

Year of construction: 1988, condition: good (used), machine/vehicle number: 108267, Steel grinding machine offer number: 20064 Make: REMA Type: DS 12 ST Machine No: 108267 Year of construction: 1988 Technical data: Bedpfjfhy Shex Aacsdi - grinding wheel diameter approx. 125 mm - 2 disc speeds 1450 / 2200 rpm - Right, - Left rotation - inclinable fixed support table ATF 340 x 150 mm - Support table -5° to +15° tiltable - Lighting - Drive 400 V / 0.65 / 0.9 kW - Working height 1000 mm - Space requirement approx. W 850 x H 1150 x D 550 mm - Weight approx. 120 kg

Condition: excellent (used), Year of construction: 2008, functionality: fully functional, spindle speed (max.): 12,000 rpm, feed length X-axis: 400 mm, feed length Y-axis: 400 mm, feed length Z-axis: 250 mm, type of input current: three-phase, rotational speed (max.): 12,000 rpm, travel distance X-axis: 400 mm, travel distance Y-axis: 400 mm, travel distance Z-axis: 250 mm, grinding spindle motor power: 10,500 W, power: 10.3 kW (14.00 HP), input current: 30 A, input frequency: 50 Hz, input voltage: 400 V, grinding wheel speed: 12,000 rpm, year of last overhaul: 2024, Equipment: rotational speed infinitely variable, For Sale: 2008 Schütte 305 Linear 5-Axis CNC Tool & Cutter Grinder | Siemens 840D | New Spindle | Medical-Grade Machine Now available at Used Machine Tools Ireland Ltd, this high-precision Schütte 305 Linear 5-Axis CNC Tool and Cutter Grinder (2008) is an exceptional solution for tool regrinding, complex geometry grinding, and high-volume production. Previously in operation at a leading medical device company, this machine has been meticulously maintained, with a brand-new spindle installed in 2024. This grinder is fully equipped with modern tooling support systems including fire suppression, Absolent mist extraction, Ebbco coolant filtration, and in-line chiller, making it production-ready for demanding grinding applications. 🔹 Manufacturer: Alfred H. Schütte 📅 Year of Manufacture: 2008 Bdjdew Nyciopfx Aacsi 📍 Location: Ireland ⚙️ Condition: Very Good – Ex-medical device use 🚀 Availability: Immediate 🔧 Spindle: Replaced in 2024 🛠️ Technical Specifications: Machine: Schütte 305 Linear CNC Tool & Cutter Grinder Machine Type: 5 Axis CNC Grinder Model: 305 Linear Year: 2008 Control: Siemens 840D with Windows XP Axes: 5-Axis CNC X-Axis Travel: 400 mm X-Axis with Tailstock: 400 mm Y-Axis Travel: 400 mm Z-Axis Travel: 250 mm Spindle Motor Power: 14 HP Spindle Speed: Up to 12,000 RPM Software: SIGS – Schütte Integrated Grinding Software Condition: Very good – Ex-medical device industry Spindle Replaced: 2024 (new) ⚙️ Equipped With: 🔥 Fire Suppression Unit 🌫️ Absolent Mist Extraction System 💧 Ebbco Coolant Filtration Unit ❄️ Ebbco In-line Chiller 🧠 Advanced SIGS Grinding Software 🛡️ New Spindle (2024) 💡 Ideal Applications: Tool & cutter regrinding Custom tooling production Precision carbide & HSS grinding Medical, aerospace, and high-specification manufacturing Schütte 305 Linear for sale Used 5-axis CNC tool grinder Tool and cutter grinder Siemens 840D Schütte SIGS software grinder CNC tool regrinding machine Ireland Schütte tool grinder with mist extraction Medical-grade grinding equipment High-performance cutter grinder 5-axis

Condition: ready for operation (used), Grit pipe grinder GR 75 belt sander offered. Dimensions: 140cm x 60cm x 100cm (LxWxH) 380v With several extra rolls Location: Hamont-Achel, Belgium Transport possible at more price Call or mail for more information See also our other advertisements We are also looking for industrial machines throughout the year. Do you have redundant machines, mail them to us with pictures and information. Seller is not responsible for typographical or data transmission errors. The machine is age-appropriate in appearance, technology and wear; used machines are sold without warranty. The price shown does not include VAT Grit pipe grinder GR 75 belt sander offered. Dimensions: 140cm x 60cm x 100cm (LxWxH) 380v With various extra rollers Location: Hamont-Achel, Belgium Transport possible at extra cost Bodsvily Nspfx Aacjdi Call or email for more information Also view our other advertisements We are also looking for industrial machines all year round. If you have redundant machines, email them to us with photos and information. The seller is not liable for typing or data transfer errors. The machine is in terms of appearance, technology and wear and tear in accordance with its age; used machines are sold without warranty. The price shown is exclusive of VAT Angeboten wird der Kornrohrschleifer GR 75 Bandschleifer. Dimensions: 140 cm x 60 cm x 100 cm (LxWxH). 380 V Mit diversen Zusatzrollen Standort: Hamont-Achel, Belgium Transport gegen Aufpreis möglich Für weitere Informationen rufen Sie an oder senden Sie eine E-Mail Sehen Sie sich auch unsere anderen Anzeigen an Wir sind auch das ganze Jahr über auf der Suche nach Industriemaschinen. Wenn Sie über redundante Maschinen verfügen, senden Sie uns diese per E-Mail mit Fotos und Informationen. Der Verkäufer haftet nicht für Tipp- oder Datenübertragungsfehler. Die Maschine ist optisch, technisch und gebrauchstechnisch ihrem Alter entsprechend; Gebrauchtmaschinen werden ohne Gewährleistung verkauft. Der angezeigte Preis versteht sich exklusive Mehrwertsteuer

Condition: used, Year of construction: 1995, functionality: fully functional, Tool grinding machine Jungner Sweden Built in 1995 Bdjdpfxewdihrj Aacji Accessories

Condition: new, IG 280 SD Specifications Motors Grinding Spindle Motor 20HP, 200 - 2330RPM Rotary Table Motor 1HP, 5 - 70RPM Servo Column Motor 2KW Coolant Pump 3/4HP, 45GPM Table Diameter 24" Table Features Thru-spindle vacuum/pressure feed Variable strength 3/4" fine pole electromagnetic chuck Custom Table Options 18" diameter T-slot or drilled for customer fixtures Contact a DCM Technical Specialist for other custom table & fixturing options Capacity Max Swing Diameter 27" Max Part Height 11" with a segmented wheel 12" with a 2A2T wheel Grinding Wheel Options Segmented Wheel Hub Kits 12" or 15" diameter 2A2T Ring Wheel Hub 12" diameter 6A2 Wheel Hub 8" diameter Cortland Chuck 12" or 15" diameter Ask a DCM Technical Specialist about our wide variety of available abrasives Feed System Servo driven Z-axis with precision ballscrew and encoder Feedrate variable from 0.0006 IPM to 0.1000 IPM AC motor driven Y-axis Electrical Requirements 230V, 50/60Hz, 3 phase Consult DCM Technical Specialist regarding operation on other voltages Dimensions 80" wide, 68" deep, 90" high Weight Machine & Swarf System: 5,480LBS. Electrical Box: 960LBS. IG 280 SD Features • 24" variable strength electromagnetic chuck with auto demag cycle • 20HP variable speed grinding spindle motor • Thru-spindle vacuum/pressure feed • Integral air mist collection and coolant flow systems for clean and consistent grinding • Programmable touch screen HMI controls Bdodpfsubbp Ssx Aacoi • Manual pulse generator for precise Z-axis positioning • Internal memory for saving grind process recipes to aid in quick changeover • Password protection and operator lock-out features • Automatic routine maintenance reminders • 76" x 64" Footprint

Condition: good (used), Year of construction: 2008, machine/vehicle number: 0810317, Offer 24325 Metal belt grinder + pipe and cylindrical grinding machine Technical data: - Sanding belt dimensions 2000 x 70 mm - surface grinding opening 430 x 75 mm Bdsdpfx Aouccppsacei - Possible tube + shaft diameter 10 to 100 mm - Adjustment of the contact wheels via hand wheels - Contact wheel B 75 / D 200 mm - Drive wheel B 75 / D 200 mm - Belt adjustment - Grinding belt speed 30 m/min - Drive 400 V / 4 kW - Space requirement approx. W 800 x H 1250 x D 1000 mm - Weight approx. 150 kg

Condition: new, functionality: fully functional, Jainnher Machine Co., Ltd. was established in 1982 and is dedicated to developing grinding machine technology, diversity and automation equipment. Jainnher is constantly offering new and improved machinery. The new JAINNHER JHP-4015 CNC Plunge Type machine with FANUC CNC Control. Hydrostatic and Hydrodynamic bearings. Capacity Max ø work swing Ø400 mm Max grinding length 1500mm Max grinding dia. Ø380 mm Max workpiece weight 150 kgs Distance between centres 1500mm Centre height 200mm Grinding wheel Grinding wheel size Ø410 x 50-100 x 203.2mm Max peripheral 33 m/sec Wheel speed 1250rpm Wheel head Feed angle 90 Swivel angle ±0 Rapid traverse speed 6m/min Max. travel 280mm Min. setting unit 0.0001mm Grinding feed rate 0.001~6000m/min Oil Pressure Hydrostatic = 20kg Hydrodynamic = 3kg Tailstock Retraction of quill 30mm Quill diameter 70mm Centre taper MT.4 ( MT.5 option) Hydraulic cylinder pressure 20kg Work head Spindle speed (variable) 10~500rpm/min Centre taper MT.4 ( MT.5 option) Spindle type Telescopic (option Swivel angle 120 (90ºCCW;30ºCW) Work- table Min. setting unit 0.0001mm Swivel angle CCW/CW +7º/-4º Rapid traverse speed 10m/min Bdodpfxjnzib Ej Aacsi Max. travel 1500mm Motor Grinding feed rate 0.001~6000mm/min Grinding wheel motor 7.5HP 4P(opt. 10.0HP) 4P Workhead motor 1.5KW Work table (Z axis) 1.8KW Work table (X axis) 1.8KW Hydraulic pump 1/4 HP 4P Wheel head pump Hydrostatic = 2.0HP Hydrodynamic = 1.0HP Coolant pump 1/8 HP 2P Magnetic coolant separator 1/25HP 2P Oil cooler ----- Oil tank Hyd. oil tank(slideways, screw ends & measurement) 60L Wheel head lubrication 50L Coolant tank 160L Machine N.W (Fully enclosed) 8080 kg G.W (Fully enclosed) 8480 kg Dimension (Fully enclosed) 4900 x 2100 x 2000mm Packing (Fully enclosed) 5090 x 2200 x 2200mm

Condition: good (used), Year of construction: 1980, machine/vehicle number: 117018, Offer 24440 Technical Data: - Grinding wheel diameter: approx. 450 mm - Grinding wheel width: approx. 63 mm - Grinding wheel bore: approx. 203 mm Bdjdpewzivqefx Aacei - Wheel speed: 950 rpm - Drive: 400 V / 3.3 kW - Working height: approx. 800 mm - Working depth / safety depth adjustable - Connection for extraction pipe: 100 mm - Coolant system - Required space: approx. W 1300 x H 1250 x D 850 mm - Weight: approx. 350 kg

Condition: excellent (used), functionality: fully functional, machine/vehicle number: 1761-1700, 457 x 152mm capacity. Equipped with magnetic chuck, power rise and fall to wheel head, table guard, coolant system, and dust extraction. SPECIFICATION Jones & Shipman Model 540P Working Surface of table 457 x 152mm Longitudinal traverse of table, hand and hydraulic 483mm Total cross traverse of table, hand and hydraulic 168mm Floor to table height 1035mm Table traverse speed range per min 1.5 – 18m Cross feed range per stroke at each reversal 0.178 – 1.78mm Micrometer cross feed graduated in Vertical feed adjustment in increments of 0.002mm Vertical movement of wheelhead (max) 280mm Wheel spindle center to table (min) 50mm Size of grinding wheel 180 x 13 x 31.75mm bore Speed of wheel 2880rpm Wheelhead motor 1.5kW Bjdpfxsnxi Uue Aacsdi Hydraulic pump motor 0.55kW Machine in Imperial execution MACHINE EQUIPPED WITH Magnetic chuck Power rise and fall to wheel head Table guard Wheel guard Coolant System Dust extraction

Condition: good (used), Year of construction: 1995, Offer 24315 Technical data: - Sanding belt dimensions 2000 x 100 mm - Surface sanding opening 400 x 100 mm - Support vice - angle adjustable 90° - 30 ° - Support fine adjustment via hand wheels - Sanding belt speed 30 m/sec. - Contact wheel / sanding roll Ø 42 mm Bodpfx Aaet Stfhocjdi - Drive 400 V / 2880 rpm / 3 kW - Space requirement approx. W 700 x H approx. 1200 x D 1200 mm - Weight approx. 225 kg - 10 contact grinding rollers approx. Ø 10 + 18 + 22 + 24 mm - 28 + 33 + 36 + 48 + 60 + 68 mm

Condition: excellent (used), Year of construction: 1984, functionality: fully functional, machine/vehicle number: BO 94392, A familair machine in any toolroom, this Jones and Shipman 540P is equipped with a 6″ x 18″ magnetic chuck, power rise and fall, coolant system and dust extraction. Bodpfxonxi R Uj Aacjdi A toolroom institution: USED Jones & Shipman Model 540P Horizontal Spindle Surface Grinding Machine Specification Working Surface of the table 457 x 152mm Longitudinal traverse of table, hand and hydraulic 483mm Total cross traverse of table, hand and hydraulic 168mm Floor-to-table height 1035mm Table traverse speed range per min 1.5 – 18m Cross-feed range per stroke at each reversal 0.178 – 1.78mm Micrometer cross feed graduated in Vertical feed adjustment in increments of 0.002mm Vertical movement of wheelhead (max) 280mm Wheel spindle centre to table (min) 50mm Size of grinding wheel 180 x 13 x 31.75mm bore Speed of wheel 3000rpm Wheelhead motor 1.5kW Hydraulic pump motor 0.55kW Machine in Imperial execution Machine equipped with Magnetic chuck Power rise and fall to wheel head Table guard Wheel guard Coolant System Dust extraction Lighting

Condition: good (used), Year of construction: 1998, Offer 24339 Technical data: - Sanding belt dimensions 2000 x 100 mm - Surface sanding opening 400 x 100 mm - Support vice - angle adjustable 90° - 30 ° - Support fine adjustment by hand lever - Sanding belt speed 30 m/sec. - Contact wheel / sanding roll for approx. Ø 42 mm - Drive 400 V / 2880 rpm / 3 kW - Space requirement approx. W 700 x H approx. 1200 x D 1200 mm - Weight approx. 225 kg Bsdpfx Ajt Uzxnoacsdi - Contact rollers 33.7 , 42 , 48 mm

Condition: new, functionality: fully functional, he EUROPA JAINNHER JHV-1008CNC vertical grinding machine is designed for grinding of large components used in the transport, aerospace, power generation, oil & gas, hydraulic and precision components. With a grinding internal diameter range from Ø50 to 800 mm, a maximum outside diameter of Ø1000 mm. The maximum height of the workpiece is 800mm, with a maximum worktable load of 1200 kg. EUROPA Jainnher JHV-1008 CNC Vertical Grinder Capacity Range of I.D. grinding 50 – 800mm Maximum O.D grinding 1000mm Z axis maximum grinding height (OD) 800mm Z axis maximum grinding height (ID) 50 – 250 : 325mm / 250 – 800 : 800mm Bsdpfjnzkvhex Aacedi Maximum swing diameter 1000mm Maximum installed component height 800mm Maximum work table load 1200kg Email for latest factory build availability

Year of construction: 1995, condition: good (used), machine/vehicle number: 044092, Offer 22148 Bjdpfx Aajiba R Nocedi Technical data: - Grinding wheel diameter approx. 200 mm - grinding wheel width approx. 25 mm - grinding wheel bore approx. 51 mm - wheel speed 1450 rpm - drive 400 V / 0,7 kW - Space requirement approx. W 600 x H 400 x D 350 mm - Weight approx. 30 kg - Console for wall mounting

Condition: excellent (used), Year of construction: 2023, functionality: fully functional, machine/vehicle number: 23087A, SPECIFICATION Maximum grinding surface 140 x 300mm Distance between column and wheel axis 300mm Max.distance between table and wheel 280mm Rapid feed per turn of handwheel 2mm Micrometric feed by small handle 0.01mm Size of cup wheel 2.2kW Wheel speed 2840rpm Approximate weight 400kg MACHINE EQUIPPED WITH 260mm x 140mm x75mm (thickness) magnetic chuck Coolant system Bsdpevntguefx Aacodi Guarding

Condition: used, Year of construction: 2002, machine/vehicle number: 2204, Universal radius metal belt grinder lot no. 24541 Technical data: - Sanding belt dimensions 2000 x 75 mm - Surface sanding opening 400 x 75 mm - Support vice - angle adjustable 90° - 30 ° - Support fine adjustment via hand wheels - Sanding belt speed 30 m/sec. - Working height 960 mm Bdedpfxeviudqj Aacei - various sanding rollers Ø 25 , 30 , 39 , 45 , 57 mm - Drive 400 V / 2880 rpm / 3 kW - Space requirement approx. W 700 x H approx. 1200 x D 1200 mm - Weight approx. 125 kg

Condition: good (used), Year of construction: 1996, Offer 24337 Technical data: - Sanding belt dimensions 2000 x 100 mm - Surface sanding opening 400 x 100 mm - Support vice - angle adjustable 90° - 30 ° - Support fine adjustment by hand lever - Sanding belt speed 30 m/sec. - Contact wheel / sanding roll for approx. Ø 42 mm - Drive 400 V / 2880 rpm / 3 kW Bodpfsvbfh Rex Aacedi - Space requirement approx. W 700 x H approx. 1200 x D 1200 mm - Weight approx. 225 kg - various contact rollers

Year of construction: 1985, condition: good (used), machine/vehicle number: 013125, Offer 21283 Technical data: - Grinding wheel diameter approx. 500 mm - grinding wheel width approx. 50 mm - grinding wheel bore approx. 127 mm - wheel speed 950 rpm - drive 400 V / 3,3 kW - working height approx. 800 mm - working depth / protection depth adjustable - Connections for suction pipe 100 mm - Space requirement approx. W 1250 x H 1150 x D 650 mm - Weight approx. 350 kg Bdjdpfx Aaji Daw Tjcoi