Beli Scm Fs 520 bekas (576)

Kondisi: hampir baru (bekas), lebar kerja 950 mm unit kalibrasi dengan rol logam unit kombinasi dengan rol karet dan sepatu yang otomatis terdeteksi start bintang-segitiga osilasi pneumatik dikendalikan melalui fotolistrik dua kecepatan transportir Daya motor 7,5 kW Hsdjyrrnijpfx Ag Rsfd tahun produksi 2000 tegangan 400V berat 976 kg

Kondisi: baik (bekas), Tahun pembuatan: 2004, Fungsionalitas: berfungsi sepenuhnya, nomor mesin/kendaraan: AA1/014057, tampilkan foto Hedpfxsyr R Rvo Ag Rjfd

Kondisi: sangat baik (bekas), Tahun pembuatan: 2022, jam operasional: 105 h, Panel saw with movable sliding table and saw blade tiltable up to 46°, enabling safe operation and reducing required space by 50% compared to a conventional panel saw; combines the functions of both a panel saw and a pressure beam saw. Easy and quick program-controlled adjustments via the "Ready" control panel from the operator station. Instant positioning thanks to the motorized and programmable rear fence, allowing fast and precise positioning of workpieces. Robust and reliable telescopic fence with scale and two flip stops: trimming panels up to 2500x3200 mm (optional 3200x3200 mm). The large, fixed table ensures optimal support of the panel during processing. Technical specifications class px 350i Max. sliding table stroke mm 2600 3200 3800 Saw blade tilting deg 0÷46° Max. saw blade diameter (cutting) mm 350 Max. saw blade diameter (routing + cutting) mm 300 Max. cutting height (D350) from table at 90°/45° mm 105/72 Hodpfx Ageyb T Trs Rjfd Max. cutting height (D300) from table at 90°/45° mm 80/50 Saw blade speed rpm 4000 Rip capacity, rear fence mm 1300 Additional technical features Three-phase motor  7 kW 50 Hz Extraction hood diameter mm 120 (1) - 100 (2) Dimensions mm L 3859 x H 1368 Location: ex site customer - Available at short notice -

Kondisi: sangat baik (bekas), CATALOG NUMBER 7288 TECHNICAL DATA - Maximum workpiece width: 230mm - Maximum workpiece height: 130mm 6 spindles: 1) Bottom horizontal: 230mm, 7.5kW 2) Right vertical: 130mm 3) Left vertical: 130mm; (spindle 2 and 3) 15kW Spindle 3 electrically adjustable, left/right 4) Top horizontal: 230mm, 11kW Spindle 4 electrically adjustable up/down 5) Bottom horizontal: 230mm, 7.5kW 6) Universal: 230mm, stepless 360° angle adjustment, 11kW - All spindles adjustable vertically and horizontally - All spindles equipped with a brake - Spindle diameter: 40mm - Infeed from the top via 4 metal feed rollers, gear-driven, including 2 double rollers - Outfeed from the top via 3 smooth rubber feed rollers, including 2 double rollers - Outfeed from the bottom via 2 rubber feed rollers - Bottom with 3 lateral pressure rollers Hfedpox Syk Hsfx Ag Rod - Infinitely variable feed speed adjustment - Pneumatically loaded pressure rollers - Feed motor: 3kW - Electric thickness adjustment - Lifting motor: 0.37kW - Infeed table length: 2480mm - Fully enclosed in cabinet - Central table lubrication - Extraction duct diameters: 130mm, 140mm, 4x125mm - Dimensions (LxWxH): 4960 x 1760 x 1700mm - Weight: approx. 3500kg ADVANTAGES - Italian manufacture - 6-head configuration - Original paint, not repainted - All spindles equipped with brake - Final spindle is universal - Used planer, condition very good Original photos Net price: PLN 54,900 Net price: EUR 13,070 (based on rate 4.2 EUR) (Prices may vary due to rate fluctuations)

Kondisi: bekas, Number of machines: 9 units. Wooden window production line for sale on behalf of customer. Hfedpfx Aeyclwxjg Rod Machines can still be inspected in operation. Sale includes machines with tools and programming for the produced systems. Includes production of angled and arched windows. Position 1: Weinig Powermat 500, year 2010, window version ----- - 6 spindles, 5 x PowerLock - 8,000 rpm - Large PowerCom control system - Spindles 2, 3, 4 CNC-controlled axially - Spindles 2, 3, 4, 5 CNC-controlled radially - Window package for glazing bead cutting: pneumatic sequencing for right-side and top spindles for bead cutting - Includes existing Leitz planing and bead tools - In line with Maweg single-piece sanding machine Saturn Duo, year 1985 and return conveyor for workpieces Position 2: SCM Windor 40 R window system, year 2006 ----- - 2 long slotting spindles, CNC-controlled - Optima 16: drilling units for face and longitudinal drilling - ROTATEN: angled window production device - 3 long profile spindles, CNC-controlled + unit for top and bottom - Turning trolley for small sashes - Workpiece return unit - Includes Leitz window and door tools - Includes separate OKOMA UF 3 rebate machine with tools Position 3: HOMAG CNC processing center BMG310/42/F/K, year 2018 ----- - Gantry machine, 5-axis Drive 5C+ with 15 kW - Ceiling laser - Working range: 4200 mm length, 1350 mm depth - 32-position disc tool changer - 8-position linear changer - Fixed drilling head: 18 spindles V12/H6/S0/90 degrees - 8 consoles - 6 lifting rails - Connection for 8 PowerClamp clamps - Approx. 30 vacuum clamps - 4 x PowerClamp clamps - WoodWop - Chip conveyor belt - Various small solid wood clamps—used for box windows - Includes Leitz tools for Homag with arched window production - Includes Barbaric vacuum lifter, year 2015 Position 4: Löwer MZP 1 mini finger joint press ----- - For arched window production Position 5: S+S frame press type Bavaria 200 L, year 2014 ----- - Working range: 4000 x 2600 mm - With central pressure beam and cross pressure device - Motorized width adjustment - Basic equipment for counter profiles - Angled window control - Pendulum pressure plates + extension for point (triangular) windows - Intermediate compensation plates for pressing small sizes - Various carrier plates for counter profiles and counter profiles themselves Position 6: Striffler sash hardware fitting table ----- - With automatic screw driver and screw feeder - Hardware rack - Punch for Roto fittings Position 7: Stegherr KF counter-profile milling machine ----- - With existing tools Position 8: Tools ----- All tools belonging to the machines for the timber + timber-aluminium systems IV 72 + 92 mm as seen in the PDF - Windows - Lift and slide doors - Arched and angled windows - Box-type windows - House entrance doors in many versions - Putty groove variants - ... Sale of tools as currently available, in scope and including accessories. Notice regarding window sections, tool drawings, tool system lists: Fa. Engelfried assumes no liab...

Kondisi: sangat baik (bekas), Mesin Planer Empat Sisi SCM Compact 23 Lebar kerja: 230 mm Tinggi kerja: 120 mm Jumlah spindle: 4 Pengaturan spindle: Bawah 5,5 kW Kanan Kiri 7,5 kW Atas 5,5 kW Kecepatan putar spindle: 6000 rpm Hodpfxjylnr Re Ag Rofd Kecepatan dapat diatur melalui variator hingga 22 m/menit Spindle dengan pengaturan

Kondisi: sangat baik (bekas), Tahun pembuatan: 2023, Fungsionalitas: berfungsi sepenuhnya, FKS-550-3200-MA-PRO-EN Hsdpfxexfku Tj Ag Rsfd

Kondisi: bekas, Tahun pembuatan: 2016, TECHNICAL DATA AXES Max. workpiece dimensions X-Y-Z mm: 3050 x 800 x 50 Min. workpiece dimensions X-Y-Z mm: 300 x 90 x 10 Working area Drilling/Grooving mm: 0 x 800 / 0 x 800 Stroke of X axis mm: 750 Max. traverse speed of X-Y axes m/min: 25 DRILLING UNIT Vertical spindles: Number 7 (4X-4Y, one shared) Horizontal spindles (along Y axis): Number 2 (1+1) Horizontal spindles (along X axis): Number 1 Fixed grooving saw (direction): X Grooving saw diameter mm: 100 Max. saw thickness mm: 5 Motor power kW (HP): 1.5 (2) Spindle speed rpm: 3350 Grooving saw speed rpm: 4300 INSTALLATION Power supply V (Hz): 380 / 400 (50 / 60) Installed power KVA: 4.5 Compressed air requirement bar: 6 Compressed air consumption Nl/cycle: 90 Extraction requirement m³/h: 1200 Extraction air speed m/sec: 20 Extraction nozzle diameter mm: 80+80 F10L Drilling Unit includes: - 7 independent vertical spindles - Drill chuck D10 mm - Distance between spindles 32 mm - 2 horizontal drilling heads: 1 in X direction with one bit, 1 double drilling head in Y direction (1 + 1 Drill chuck D10 mm) - Speed 3350 rpm - 1 integrated saw unit in X (max. diameter 100 mm) - Saw blade speed 4300 rpm - Motor power 1.5 kW - Vertical pneumatic travel per spindle 70 mm - Horizontal pneumatic travel of the drilling unit Workpiece positioning and drive of working unit A CNC-controlled suction cup clamps and positions the workpiece sequentially under the working unit during machining. Movement along X and Y axes occurs on THK linear guides with transmission via reinforced toothed belts. Movement along Z axis is pneumatic on ball-bushing guides, with adjustable stopper positioning. Positioning of the working units is via DC motor technology and drives. Hsdpfx Agovvi I Re Rjfd CNC CONTROL The control system was specially developed for use in drilling and milling machines. CN - 7" color display with touchscreen - Alphanumeric keypad - Self-diagnosis and operator language fault messages Programming - Programming via the CN - Automatic optimization of drilling operations - Possibility of panel zero-point shift - Possibility to store and import drilling programs via USB dongle - Ability to import drilling programs from external CAD-CAM software Configuration - User interface in the same language as the manuals - Graphical representation of unit configuration Vacuum suction cup "B-Power" Vacuum suction cup with double vacuum connection, recommended for highly porous panels (e.g., MDF light). Machine operating interface Software: Xilog Maestro USB Hardware and software requirements: - Operating system: Windows XP Professional (SP2), Windows Vista or Windows 7 - Processor: Intel compatible, min. 2GHz; multicore processor recommended - Memory: Minimum 1GB, 2GB recommended - Free disk space: 5GB - Graphics card: OpenGL compatible (Package includes an installation DVD and a USB dongle) Xilog Maestro features Programming - Parametric, graphical programming - Assisted programming with graphic and syntax aids for drilling operations - Ability to create and store machining macros Integrated additional functions - Self-diagnosis and operator language fault messages

Kondisi: bekas, Tahun pembuatan: 2018, en: Startech cn MAIN FEATURES FLEXIBLE AND CUSTOMISABLE PRODUCTION COMBINED WITH SPEED AND PRECISION DRILLING FROM ABOVE WITH REFERENCE TO THE TOP SIDE OF THE PANEL ALLOWS FOR ABSOLUTELY PRECISE MACHINING NUMERICAL CONTROL WITH 7" COLOUR SCREEN: EASY AND INTUITIVE TECHNICAL SPECIFICATIONS Startech CN AXES Max. workpiece dimensions X-Y-Z mm 3050 x 800 x 50 Min. workpiece dimensions X-Y-Z mm 300 x 90 x 10 Working area drilling/grooving mm 0 x 800/0 x 800 X-axis stroke mm 750 Max. traversing speed X-Y axes m/min 25 DRILLING UNIT Vertical spindles Number 7 (4X-4Y, one shared) Horizontal spindles (along Y axis) Number 2 (1+1) Horizontal spindles (along X axis) Number 1 Fixed groove saw (direction) X Groove saw diameter mm 100 Max. groove saw thickness mm 5 Motor power kW (HP) 1.5 (2) Spindle speed rpm 3350 Groove saw speed rpm 4300 INSTALLATION Power supply V (Hz) 380 / 400 (50 / 60) Installed power KVA 4.5 Compressed air requirement bar 6 Air consumption Nl/cycle 90 Extraction requirement m3/h 1200 Extraction air speed m/sec 20 Extraction nozzle diameter mm 120 GENERAL FEATURESUniversal CNC drilling machine with fixed gantry work table and moving workpiece for performing the following operations: - Vertical drilling on the panel surface - Horizontal drilling on all four sides of the workpiece - Grooving with integrated groove saw in "X" direction Self-supporting frame Machine base in steel tube construction to provide a large base for the work table. The structure is positioned on 3 self-levelling feet. The electrical cabinet is integrated into the machine base. Central Bakelite support table "Easy Motion": - an MDF sector for through drilling, automatically swivelling away for horizontal drilling - an infeed roller to facilitate panel feeding - a rear roller track to facilitate panel sliding - left and right stops - a manually adjustable central alignerIt is necessary to use the left and right stops to drill the two opposite panel sides horizontally in the "X" direction. Panel positioning along the X-axis by vacuum suction cups. Unit carriage This is a gantry structure in steel tube construction. The main working unit is installed on the gantry. F10L drilling unit includes: - 7 independent vertical spindles- chuck D10 mm- spindle spacing 32 mm - 2 horizontal drilling heads, 1 in X direction with one drill, 1 double drilling head in Y direction (1 + 1 chuck D10 mm) - speed 3350 rpm- 1 integrated saw unit in X (max. diameter 100 mm) - saw blade speed 4300 rpm- motor power 1.5 kW - vertical pneumatic stroke per spindle 70 mm - horizontal pneumatic stroke of the drilling unit Positioning of the workpiece and drive of the working unit A CNC-controlled vacuum cup clamps the workpiece and positions it sequentially under the working unit during machining. X and Y axis movement on THK linear guides with reinforced toothed belt transmission; Z axis movement is pneumatic on ball-bushing guides with position stop adjustable via the working unit position. Positioning of the work units via state-of-the-art control and drive technology -CONTROL The control system was specially developed for industrial use. Hsdpfx Agsvwbp Ae Refd

Kondisi: bekas, Tahun pembuatan: 2011, Besar area kerja pada arah X: 2770 mm Besar area kerja pada arah Y: 1220 mm Ketebalan pemrosesan (ukuran Z): 80 mm Konstruksi mesin: mesin portal Daya spindle utama: 11,0 kW Kecepatan spindle utama: 1500 - 24000 rpm Spindle dengan kontrol vektor: Ya Sistem penjepitan: HSK 63 F Pendingin spindle: Pendingin udara Jumlah sumbu: 3 Penukar alat: Ya Tempat alat: 10 unit Keyboard mesin tik: Ya Mouse: Ya Sistem program: Xilog Plus DXF Interface: Ya Koneksi online memungkinkan: Ya CD Rom Drive: Ya Tipe meja: meja grid Sistem pemberhentian: silinder pemberhenti Jumlah pompa vakum: 1 Kapasitas pompa vakum: 250 m³/h Pengaman: alas pijakan keselamatan Lokasi gudang: Sonnefeld Hfodpfsvvi Htsx Ag Red

Kondisi: bekas, Tahun pembuatan: 2004, Lokasi gudang: Nattheim Hjdsvvi Hyopfx Ag Rsfd

Kondisi: bekas, Tahun pembuatan: 2020, CNC-CONTROLLED MACHINING CENTER WITH MULTIFUNCTION TABLE - WORK CELL VERSION X400 CELL Hfsdsvvi N Iepfx Ag Rjd Drilling and Milling Made for You! The numerically controlled machining center comes equipped with a comprehensive range of accessories and tooling for milling and drilling, designed to meet any requirement in the processing of wood and similar materials. - High-performance: Equipped with drilling spindles capable of 8,000 rpm and industry-leading spindle technology, it features the most robust spindle currently available on the market, offering over 1,000 hours of maintenance-free operation. - Superior and more comprehensively equipped: Multiple configuration options via the multifunction table ensure the machine can be optimally adapted to any operational requirement. - Easier and more intuitive programming thanks to the integrated MAESTRO CNC CAD-CAM module. - User-friendly: The worktable is accessible at all times, the control cabinet and vacuum pump are integrated, and in the PRO SPACE configuration, there are no protective barriers. Load-Bearing Structure The supporting structure consists of an exceptionally robust monolithic steel base, heavily ribbed and highly rigid; the particularly wide support surface was specially designed to give the machine stability and to maintain ongoing precision under all working conditions, with no need for anchoring to the floor. The base provides a large, solid platform for the moving gantry: the work unit thus benefits from a balanced, stable, and resilient support capable of withstanding heavy use, resulting in higher quality performance and increased accuracy. The moving gantry itself is a sturdy single piece anchored on both sides of the base and runs on top-grade prismatic linear guides with recirculating ball shoes. The dual drive system on the X-axis delivers peak performance even under heavy-duty conditions. The movement of the lower mobile unit (X-axis) and the working unit along the beam of the mobile unit (Y-axis) is driven by helical rack and pinion transmission, offering increased tooth-to-tooth engagement for higher acceleration and greater speed along both the X and Y axes. The specially designed helical teeth ensure reduced wear of mechanical parts and significantly quieter operation. The vertical Z-axis is driven by a recirculating ball screw, engineered to deliver perfect balance under dynamic load and handle both rapid acceleration and deceleration. The main milling unit is directly coupled to the Z-axis slide, ensuring the highest quality of finishing work by completely eliminating potential vibrations. Movement along the X-Y-Z axes is driven by brushless motors powered by static inverters, which provide: - Reduced processing times thanks to improved acceleration - Increased positioning accuracy due to high-resolution encoders - No need for setup resetting when the machine is powered on thanks to absolute encoders - Minimal maintenance, as the brushless system eliminates the need for brushes Axis movement and all machine work functions are managed via an industrial NS module with digital D...

Kondisi: bekas, Tahun pembuatan: 1999, Lokasi gudang: Nattheim Hedpfovvi Rxsx Ag Rofd

Kondisi: bekas, Tahun pembuatan: 2019, including tools CNC CONTROLLED MACHINING CENTER Morbidelli M100 Drilling and Milling - Made for You! This numerically controlled machining center is equipped with a comprehensive range of tools for milling and drilling, capable of meeting every woodworking requirement. - Maximum performance - with drilling spindles at 8,000 rpm and cutting-edge technology, featuring the most robust spindle available on the market, with over 1,000 hours of maintenance-free operation. - Optimal and fully equipped - the suction cups can be individually configured with the TV FLEX worktable to tailor the machine to specific requirements. - Easy and intuitive programming thanks to the integrated Cad-Cam MAESTRO CNC software. - User-friendly operation: the lowered machine frame allows full access to the worktable at any time. The control cabinet and vacuum pump are integrated into the machine bed, and in the PRO SPACE variant, no additional structural safety measures are necessary. Supporting Structure The supporting structure consists of an exceptionally sturdy monolithic steel base, highly ribbed and robust. The particularly wide base provides the machine with exceptional stability, ensuring consistent precision under all working conditions. The machine does not need to be anchored to the floor. The base forms a large and solid support for the movable gantry: the working unit is equipped with a balanced, stable, and resilient support that withstands the highest loads, ensuring superior performance and greater accuracy. The moving gantry consists of a solid, single piece anchored to the base and travels on high-quality prismatic guide rails with ball bearing blocks. The working unit is mounted on it and moves along the Y and Z axes, also on prismatic guides with ball bearing blocks. Movement of the lower moving unit (X-axis) and the working unit along the traverse of the moving unit (Y-axis) is achieved via helical rack and pinion drive, resulting in increased tooth-on-tooth engagement for greater acceleration and higher speed along the X and Y axes. The specifically designed helical gearing reduces wear on mechanical components and ensures quieter operation. The vertical Z axis is driven by a recirculating ball screw, providing perfect balance under dynamic load and strong acceleration/deceleration. The main milling unit is directly connected to the Z-axis carriage, ensuring highly precise finishing as vibrations are completely eliminated. Travel along the X-Y-Z axes is powered by brushless motors driven by static inverters, offering: - Reduced machining times thanks to improved acceleration - Better positioning accuracy due to high-resolution encoders - No setup required when powering the machine up, thanks to absolute encoders - Elimination of routine maintenance, as the brushless system contains no brushes Management of axis movement and, in general, the machine's operating elements is handled via an e Hfedpovvi Scjfx Ag Rod

Kondisi: bekas, Lokasi gudang: Nattheim Hodswkirqspfx Ag Rofd

Kondisi: bekas, Tahun pembuatan: 2001, panjang total: 1.700 mm, lebar total: 1.000 mm, tinggi total: 2.100 mm, translation Hfedpeymlahofx Ag Rsd

Kondisi: sangat baik (bekas), working width 180 mm working height 120 mm Hedpfxsw Ad Hms Ag Rjfd 4 heads two feed speeds star-delta start head adjustment on two axes electric adjustment of pressure beam spindle speed 6000 rpm

Kondisi: bekas, Tahun pembuatan: 2022, termasuk 2 bak lem Ketebalan pelapisan tepi rol: 0,4 - 3 mm Ketebalan pelapisan tepi strip: 5 mm Tinggi benda kerja min - maks: 8 - 50 mm Kecepatan makan: 9 m/menit Unit pra-routing Unit lem Unit pemotong Unit pembulat Unit frais sejajar Pisau tarik radius Pisau tarik bidang Unit polisher Perangkat semprotan Hedpfew Aig Sox Ag Rjfd Lokasi penyimpanan: Pelanggan

Kondisi: sangat baik (bekas), 7790 Hfedpjx S Eb Rofx Ag Red

Kondisi: sangat baik (bekas), CATALOG NUMBER 7850 Technical Data: - Maximum working width: 1100 mm - Maximum working height: 160 mm 2 units: 1) Grooved rubber roller for calibration 2) Grooved rubber roller + pneumatically-actuated sequential pad + metal roller - Motor power: 15 kW - Brake From above: - Divided slip rubber roller - Processing unit - Divided slip rubber roller - Unit with pad - Divided slip rubber outfeed roller - Cleaning brush From below: - 2 slip metal rollers - Pulling belt - 2 slip metal outfeed rollers - Pneumatic belt oscillation controlled by photocell Hodpfx Ajx Hhy Ssg Rjfd - Electric table lifting - 2 feed rates - Feed motor power: 0.75 kW - Sanding thickness potentiometer - Operating pressure: 8–10 bar - Extraction connection diameter: 3x165 mm - Overall dimensions (LxWxH): 1900x1700x1930 mm - Weight: approx. 1502 kg ADVANTAGES – Italian-made, SCM brand – 2 processing units – Sanding thickness potentiometer – Pneumatic sequential pad – Not repainted – Includes DTR technical documentation – Used sander, very good condition Net price: 32,900 PLN Net price: 7,830 EUR Net price based on exchange rate of 4.2 PLN/EUR (In case of significant exchange rate fluctuations, the price may change)

Kondisi: baik (bekas), Tahun pembuatan: 2016, Fungsionalitas: berfungsi sepenuhnya, Mesin edge banding bekas SCM - Model: Olimpic K360 T-ER1 - Kondisi sangat baik. Hfodjyrr Naspfx Ag Rsd - Tersedia segera - Video atas permintaan - Tahun produksi: 2016 - Fitur lengkap (2 bak lem ekstra)

Kondisi: baik (bekas), Tahun pembuatan: 2005, Pada tahun 2022, sistem kontrol baru dipasang seharga 9.000,-- €. Sumbu X: 2500 Sumbu Y: 1018 saat pengeboran Hfedjyrmayjpfx Ag Rjd Sumbu Y: 1240 saat milling Sumbu Z: 100 Spindel utama: 6,6 kW dengan dudukan HSK 63 Penukar alat depan: 5 slot Belakang: 5 slot Unit bor Unit milling Gergaji alur

Kondisi: baik (bekas), Tahun pembuatan: 2021, Edgebander bekas SCM Olimpic K360 - 11 m/menit - Ketebalan pelat: 8 - 60 mm - Ketebalan edging: 0,4 - 6 mm - Panjang mesin sekitar 4.200 mm - Berat sekitar 1.200 kg - Tersedia segera - Jam kerja/meteran sedikit (lihat foto) Hedjyrrpmopfx Ag Rjfd Silakan hubungi kami jika ada pertanyaan.

Kondisi: diremajakan ulang (bekas), Tahun pembuatan: 2003, Fungsionalitas: berfungsi sepenuhnya, Pusat pemesinan SCM, model RECORD 110 TV dengan meja 8 bar dengan cup vakum. 3 sumbu. Area kerja 2970 x 1480 x 330 mm. Spindel milling 7,5 kW, dudukan alat HSK F63, unit bor dengan 9 spindel, unit pemotong gergaji, majalah alat dengan 8 posisi, pompa vakum dengan pendingin. Pompa vakum Becker 250. MESIN BEKAS – DIREKONDISI SECARA MENYELURUH. Hedjyrg Tajpfx Ag Rsfd

Kondisi: sangat baik (bekas), Gergaji bundar SCM SI 400EP NOVA dengan scorer Hfsdpfxsyrdp Ss Ag Rsd