Malek Brautech Polnilnik In Zapiralec Pločevink nakup rabljenega (120.416)

Stanje: rabljeno, Leto izdelave: 1995, Konstantni stroj - kombinirana postaja, krtača za prah - naprava za merjenje debeline - elektronska posamezna brusna čevelj MCS sistem Weber 32 mm - utorni jekleni kalibrirni valj - izpihovanje traku - vakuumska preproga. Širina brušenja: 1100 mm. Pogon: 15 kW. Podajanje ca. 1,1 kW. Nastavitev višine 0,25 kW. Dimenzije brusilnega traku: 1150 x 2500 mm. Maksimalna debelina obdelovanca: 150 mm. Širina stroja: 1700 mm. Dolžina stroja: 2000 mm. Višina stroja: 2160 + 150 mm. Teža stroja: 1900 kg. Konstantna delovna višina: 850 mm. Priklop za odsesavanje: trak 180 mm / krtača 120 mm. Količina sesalnega zraka: 0,74 m³/s. Priključna moč: 23 kW. Priključek za stisnjen zrak: 7 bar. Hitrost podajanja: 3–15 m/min. Delovnih ur: 7000 h. Nedpfx Asx Twcpjh Ujwg Lokacija skladišča: Nattheim

Stanje: rabljeno, Tehnične podrobnosti: Premer struženja nad posteljo: 560 mm Premer struženja nad suportom: 280 mm Dolžina struženja: 2000 mm Višina konic: 280 mm Razdalja med konicami: 1600 mm Izvrtina glavnega vretena: 65 mm Območje vrtljajev: 9...1800 / 24 stopenj min⁻¹ Nodpfx Aowa I Sheh Ujwg Vzdolžni pomik: 0,025-0,09 mm/obrat Prečni pomik: 0,012-0,045 mm/obrat Pomik pinole konjička: 225 mm Priključek konjička: MK5 Skupna priključna moč: 18 kW Teža stroja pribl.: 3,8 t Mere stroja (DxŠxV): 3,7 x 1,6 x 2,05 m Trivpenjalni vpenjalni tulec D=320 mm Zgornji suport vrtljiv ±45°

Stanje: rabljeno, Leto izdelave: 1952, Technical Details: Swing diameter over bed: 1000 mm Swing diameter over slide: 520 mm Turning length: 2500 mm Slide travel Z-axis, saddle: approx. 500 mm Slide travel Z-axis, top slide: approx. 300 mm Center height: 300 mm Spindle bore: 90 mm Speed range: 3.2 - 382 / 22 steps rpm Nwjdpfx Ahsu Tq U Io Ueg Feed range X-direction, longitudinal: 0.213 - 2.67 / 36 steps m/min Feed range Y-direction, cross: 0.070 - 1.11 / 36 steps m/min Tailstock quill taper: MK 6 Total power requirement: 22 kW Machine weight approx.: 8.2 t Machine dimensions approx. LxWxH: 5.3 x 1.6 x 1.6 m Transport dimensions approx.: 5.5 x 1.7 x 1.6 m Equipment: Face plate Ø 1000 mm 4-position tool post Steady rest Ø 250 mm, closed Accessories: Four-jaw chuck Ø 630 mm

Stanje: rabljeno, Leto izdelave: 1976, Technical Details: Swing diameter over bed: 340 mm Swing diameter over cross slide: 190 mm Turning length: 800 mm Nwedpfx Ahsva Erto Ujg Turning length: facing = 140 mm / cross = 120 mm Centre height over bed: 170 mm Spindle bore: Ø 40 mm Spindle speed range: 25 - 2000 RPM / 20 steps Feeds: longitudinal: 0.028 - 1.0 mm/rev / cross: 0.012 - 0.44 mm/rev Tailstock quill taper: MT3 Tailstock quill travel: 120 mm Total power requirement: 3.0 kW Machine weight approx.: 1.1 t Machine dimensions approx. LxWxH: 2.0 x 0.8 x 1.4 m Thread cutting possible: Metric, Whitworth, and module threads Equipment: - 2-way measuring system VISUCONT - 3-jaw chuck Ø 205 mm with internal clamping jaws - Multifix quick-change tool post - Foot brake - Coolant pump (delivery line exclusive)

Stanje: rabljeno, Leto izdelave: 1971, Technical Details: Max. face turning diameter: approx. Ø 900 mm Spindle speed: 12.5 - 2000 / 24 steps rpm Faceplate speed: 8 - 190 / 12 steps rpm Feed rates (faceplate): 0.03 - 3 mm/step Rapid traverse (all axes): 2000 / 4000 mm/min Tool holder (work spindle): ISO 50 / SK50 Clamping area (table): 700 x 800 mm Table rotation: 360° Cross traverse of drilling table: 800 mm Max. table load: 1500 kg Total power requirement: approx. 11.0 kW Machine weight: approx. 7800 kg Dimensions (L x W x H): approx. 3.0 x 2.0 x 2.6 m Nwedpeu Idtpjfx Ah Uog Control cabinet dimensions: 1800 x 400 x 1950 mm Faceplate Ø: 420 mm Faceplate slide travel: 180 mm Max. face turning diameter: approx. 900 mm Longitudinal travel of column: 700 mm Vertical travel of spindle headstock: 700 mm Feed drive of column, spindle headstock and clamping table: - In spindle operation: 0.20 - 10 mm/rev, 34 steps - In faceplate operation: 0.16 - 16 mm/rev, with steps Equipment: Optical precision measuring system/Heidenhain linear scale for X/Y/Z/C-table axes Hydraulics Machine feet/base plates Operator panel with pendant arm

Stanje: rabljeno, Leto izdelave: 1991, Technical Details: Workpiece diameter - max.: 8 - 50 mm Workpiece length: 5 - 500 mm Spindle speed: 100 - 1000 rpm Workpiece diameter - max.: Ø 50 mm (solid material) Workpiece diameter - min.: Ø 8 mm (solid material) Workpiece diameter - max.: Ø 70 mm (tubing) Workpiece diameter - min.: Ø 8 mm (tubing) Wall thickness: 1 - 10 mm Centre height: 300 mm Spindle bore: Ø 90 mm Cut-off length with swing stop min./max.: 5 - 500 mm Total power requirement: approx. 25 kW Machine weight approx.: on request t Machine dimensions (LxWxH): approx. 5.8 x 1.5 x 1.7 m Control cabinet dimensions: 1300 x 450 x 1950 mm Dimensions (L x W x H): control panel: 0.36 x 0.30 x 0.68 m Dimensions (L x W x H): material feed: 5.5 x 0.95 x 1.15 m Cut-off turning and end-finishing machine including bar feeder (Manufacturing processes: cutting to length and deburring, parting-off, facing, grooving, centering, and more possible) Working principle: stationary material – rotating tools Further features: - Steplessly adjustable parting/cut-off head speed: 100 - 1000 rpm - End-machining: 4 tool sets with speed from 52 - 1320 rpm - Feed for cut-off head/tool: stepless, 0 - 0.3 mm/rev, with rapid and working feed, hydraulic Nedpfxeu Iww Uo Ah Uswg - Feed for deburring device: stepless up to 0 - 175 mm/sec. - Material feed speed: 170 mm/sec. - Piece counter - Bar feeder Operation via operator panel/control panel i.D.

Leto izdelave: 2001, stanje: rabljeno, Technical details: Nwsdpfxeu Nvixo Ah Ueg Load capacity: 0.15 t Span: approx. 1200 mm Reach: max. 1200 mm Lift height: 2400 mm Lifting speed: manual control Machine weight approx.: 0.42 t Dimensions (L x W x H): 2.2 x 0.75 x 1.65 m Engine hoist / engine crane Welded sectional steel construction Lifting motion via lift beam, vertical movement pneumatically operated (pneumatic pressure cylinder) using hand lever Load hook type SIKA 1, with cable safety Mobile; braked when drawbar in vertical position, twin castor wheels can be swivelled 90° right/left, front section fitted with 2 fixed wheels Accessories: 2 various lifting straps and 1 chain, length approx. 950 mm

Stanje: rabljeno, Leto izdelave: 1999, Technical details: Swing diameter over bed: 340 mm Swing diameter over support: 190 mm Turning length: 700 mm Distance between centers: 700 mm Spindle speeds: 55 - 2350 rpm / 8-step mechanical Spindle bore: 50 mm Tailstock quill travel: 120 mm Tailstock quill: MT3 Spindle torque: 350 Nm Maximum workpiece weight – between centers: 50 kg Total connected load: 3.0 kVA Machine weight approx.: 0.79 t Machine dimensions approx. LxWxH: 1.6 x 0.9 x 1.4 m 3-jaw chuck Forkardt Ø 200 (external clamping) Longitudinal slide X-axis travel: 600 mm; longitudinal feed 0.045 - 0.787 mm in 20 steps; metric thread Cross slide Y-axis travel: 220 mm; feed 0.023 - 0.406 mm in 20 steps Top slide swivels 60° right and 120° left Thread cutting Machine lighting No coolant system (pre-installed) Accessories: 3 sets of turning jaws 3x Multifix toolholders 2x drill chucks 1x live center 3 machine feet Nodpfeu Ixw Asx Ah Uowg

Stanje: rabljeno, Leto izdelave: 1987, Technical specifications: Swing diameter over bed: 500 mm Swing diameter over cross slide: 280 mm Nwsdpou Ixznofx Ah Usg Turning length: 1500 mm Distance between centers: 1500 mm Swing diameter in gap: 730 mm Spindle bore: 65 mm Spindle speed range: 25–1250 / 32–1600 / 36–1800 rpm, 18 steps Feed rate: 0.05 – 8.5 mm/rev Rapid traverse x-axis: 4 m/min Rapid traverse y-axis: 1.26 m/min Tailstock quill taper: MT 5 Tailstock quill stroke: 200 mm Total connected load: approx. 8.2 kW Machine weight approx.: 2.5 t Machine dimensions (L x W x H): approx. 3.2 x 1.3 x 1.5 m Thread cutting possible Cross slide travel 300 mm, feed 0.015 – 2.8 mm (end position clutch not functional, manual shut-off required) Top slide with 4-way toolpost Steel faceplate Ø 705 mm with offset threaded holes

Stanje: rabljeno, Leto izdelave: 1994, Technical details: Required air pressure: 8 bar Total power requirement: 14 kW Approx. machine weight: 80–170 kg per machine Nwjdpfxeu Icyhe Ah Uog MULTIFUNCTION STAMPING AND DRILLING AUTOMATON – ideally suited for aluminium window manufacturing. 3 units: - For Schüco aluminium window frame, mullion, and transom profiles S65 - For Schüco aluminium window sash profiles Royal S 55, S 65, and S 70 systems - For Schüco aluminium door profiles Royal S65 door base profiles - Foot pedal operation - Pneumatic air gun A N D DRILLING AUTOMATON Application: - Drilling automaton for door hinges - Drill holders: for 8 drill bits; for use with 6 countersink drills, diameter 11/15 mm, approx. 80 mm long - Tool clamping by foot pedal, drilling by hand operation - Accessories: various attachments.

Stanje: rabljeno, Technical details: Vertical rapid feed: Z-axis: 1,125 mm Horizontal travel: X-axis: 600 (+1,000 electrically/manual) mm Cross feed: Milling slide Y-axis: 325 (340) mm Control system: Siemens 840D Clamping surface diameter: 3,500/5,800 mm Turning diameter: max. 6,000 mm Rotational speed range, faceplate: 1–12 rpm Spindle speed (milling spindle): 1,000–6,000 rpm Max. workpiece diameter on pallets: 6,000 mm Workpiece weight: 10–2,000 kN Tool holder: HSK-A-100 Total power requirement: 120 kVA Machine weight approx.: 35 t Njdpfju Idlfox Ah Uowg VERTICAL RING AND CYLINDER MACHINING CENTER SPECIAL CNC MACHINING MACHINE Application: FOR TURNING, BORING, MILLING, AND GRINDING RING-SHAPED PARTS (large slewing bearings, slewing rings, gear rims, special flanges, and much more.) Machine structure: Two separate main units: Column unit and faceplate/table unit - Feed drives via AC servomotors - Cross movement of milling support Z-axis 325 (max. 340) mm - Faceplate drive power: 76 kW - Table positioning accuracy = 0.02 mm Renewed/Upgraded: - Axis motors replaced (Siemens) - Central lubrication for large slewing bearing of rotary table/spindle expanded - Partial machine rewiring - Accumulator and safety valve in progress.

Stanje: rabljeno, Technical details: Swing over bed: 320 mm Turning length: 800 mm Distance between centers: 800 mm Center height: 150 mm Spindle bore: 30 mm Speed range: 35 - 1500 rpm / 16 steps Feed range X-axis: 0.04 - 2.4 m/min / 30 steps Tailstock quill stroke: 125 mm Tailstock taper: MT2 Machine dimensions approx. LxWxH: 1.7 x 0.8 x 1.5 m Equipment and additional features: - Röhm 3-jaw chuck 160 mm - Chuck guard Nedpou Ixy Dsfx Ah Uewg - Safety system WxH: 510x400 mm - Multifix tool holder (4 pcs) - Centre in tailstock - Compound slide swivels +/- 45°, maximum travel = 100 mm - Cross slide travel = 300 mm feed - Pump for coolant system (without supply)

Stanje: rabljeno, Leto izdelave: 1960, Technical Details: Swing diameter over bed: 630 mm Swing diameter over saddle: 320 mm Turning length: 2,800 mm Distance between centers: 2,800 mm Swing diameter in gap: 700 mm Gap length: 450 mm Spindle bore: 70 mm Nwodpfsu Ix A Eox Ah Usg Machine weight approx.: 4.4 t Machine dimensions approx. LxWxH: 4.7 x 1.5 x 1.5 m Thread cutting capability Accessories: 4-jaw chuck Various centers Gears Jaws and small parts Steady rest *

Stanje: rabljeno, Leto izdelave: 2016, Technical Details: Swing diameter over bed: 402 mm Swing diameter over cross slide: 245 mm Turning length: 1000 mm Centre distance: 1000 mm Centre height: 200 mm Swing diameter in gap: 560 mm Gap width: 120 mm Spindle speeds: 40 - 345 / 345 - 1015 / 1015 - 2800 rpm Feed rate: longitudinal: 0.05 - 0.752 mm/rev cross: 0.025 - 0.376 mm/rev Spindle bore diameter: Ø 42 mm Tailstock taper (ISO): MK4 Tailstock quill stroke: 180 mm Total connected load: 4.1 kW Machine weight approx.: 1.2 t Machine dimensions approx. (LxWxH): 2.4 x 1.0 x 1.7 m Nwedpsvav Sdofx Ah Ueg The lathe does not feature rapid traverse. Positioning via 2 axes Display via Pinacho Lathe Controller Multifix quick-change tool post with turning tool Coolant system Foot switch Thread cutting possible (metric, Whitworth, module, pitch)

Stanje: rabljeno, Technical details: Wire diameter - max.: 9.0 mm Wire diameter - min.: 2.0 mm Operating voltage: 380 V / 50 Hz Control voltage: 220 V Total power requirement: 18 kW Machine weight approx.: 5.0 t Dimensions lubrication unit: 830 x 650 x 1000 mm Machine dimensions approx. LxWxH: 3.3 x 1.5 x 1.45 m Control cabinet dimensions LxWxH: 0.7 x 1.5 x 1.75 m Nwsdpevc Aklefx Ah Ujg WIRE STRAIGHTENING AND CUTTING MACHINE / MACHINE WAS RETROFITTED WITH NEW CONTROLS IN 2000 A programmable, electronically-hydraulically controlled universal spring coiling machine for the production of tension and compression springs, as well as leg springs, in both right- and left-hand windings. Springs can be produced with any pitch and body shape. Performance: up to 90 pcs/min. Spring outer Ø: 10 - 120 mm Wire feed length: unlimited, speed = 27 - 80 m/min. Coiling unit: Two-finger system for wire diameter Ø 2.0 - 9.0 mm; spring outer Ø 10 - 120 mm Single-finger system: wire diameter Ø 3.0 - 7.0 mm; spring outer Ø max. 60 mm Equipment: 5x feed rollers, wire take-up 3 mm two-finger Spring length measuring device LION PRECISION-PANTHER Wire spool holder POST, motor-driven, mandrel diameter Ø 1,400 mm Lubrication system Control cabinet cooler RITA Hydraulic unit A wide range of accessories and/or spare parts available on request! Subject to prior sale.

Stanje: rabljeno, Leto izdelave: 1975, Technical Details: Swing diameter over bed: 500 mm Swing diameter over cross slide: 260 mm Turning length: 950 mm Centre height measured in bed: 220 mm Centre distance: 1000 mm Spindle speeds: 11.2 – 2240 rpm / 24 steps Spindle bore: 62 mm Tailstock quill travel: 210 mm Longitudinal feeds: 0.045 – 1.6 mm/rev – 32 steps Cross feeds: 0.02 – 0.71 mm/rev – 32 steps Total power requirement: 11 kW Approx. machine weight: n/a t Approx. machine dimensions (LxWxH): 3.3 x 1.2 x 1.6 m The machine is in very good condition (very quiet spindle operation) and available ex location Leipzig. Top slide swivels 360° 3-jaw chuck Ø 315 mm with jaws (internal/external) for speeds up to 2000 rpm. Thread cutting: metric, module, imperial Chip guard Chuck guard (mechanical) MULTIFIX toolpost with Ø 40 mm boring bar holder Nedpfsv A Sqhjx Ah Uswg Chip tray Coolant supply with pump Leadscrew protection Machine feet UVV (accident prevention regulation) pre-installed *

Stanje: rabljeno, Leto izdelave: 1970, Technical Details: Swing diameter over bed: 325 mm Swing diameter over support: 150 mm Turning length: 1000 mm Turning length, facing: 165 mm / cross: 160 mm Center height over bed: 200 mm Length of gap: no gap mm Spindle speed range: 48 - 1,500 rpm / 10 steps Spindle bore: 40 mm Feeds: longitudinal: 0.021–2.34 mm, cross: 0.09–1.6 mm Tailstock quill taper: MK 4 Nsdpfou Ixydex Ah Uowg Tailstock quill travel: 125 mm Total power requirement: 2.2 kW Machine weight approx.: 1.0 t Machine dimensions approx. LxWxH: 2.1 x 0.7 x 1.2 m Thread cutting possible: Metric, Whitworth and module threads Equipment: - 3-jaw chuck Ø 200 mm with internal clamping jaws - Multifix quick-change tool post - Foot brake - Coolant pump (supply exclusive)

Stanje: rabljeno, Leto izdelave: 1955, Technical details: Swing diameter over bed: 420 mm Swing diameter over cross slide: 240 mm Turning length: 1100 mm Swing diameter in the gap: 600 mm Spindle speed range: 24 - 900 / 8 steps rpm Spindle bore: 41 mm Feed range X-axis: 0.0120 - 0.1000 mm/rev Feed range Z-axis: 0.0062 - 0.0302 mm/rev Tailstock quill taper: MT 3 Tailstock quill travel: 220 mm Total power requirement: approx. 4.0 kW (non-binding) Machine weight approx.: 1.2 t Machine dimensions approx. LxWxH: 2.3 x 0.9 x 1.3 m Equipment: 3-jaw chuck Röhm Ø 200 mm Nwjdpfx Aju Ix D Ash Ujg 4-way tool post, swiveling 30° right/left 2x T-slot for copying device Live center

Stanje: rabljeno, Leto izdelave: 1951, Technical Details: Swing over bed: 400 mm Swing over cross slide: 240 mm Turning length: 1100 mm Centre height (measured in bed): 190 mm Spindle bore: 40 mm Speed range: 37.5 - 950 rpm Total power requirement: 3.5 kW Tailstock quill taper: MT 4 Tailstock quill travel: 180 mm Approx. machine weight: 1.6 t Approx. machine dimensions (LxWxH): 2.6 x 1.4 x 1.3 m The lathe is equipped with a thread cutting device. It has been rewired and fitted with a new control cabinet. Emergency stop switch and chuck guard Nedpfx Ahju Ix Hds Uewg 3-jaw chuck, Ø 250 mm Live centre Toolpost: four-way toolholder Compound slide swivels approx. 30° to the right/left Taper turning attachment (taper 15° right/left) 4 change gears included

Stanje: rabljeno, Leto izdelave: 1986, Technical details: Swing diameter over bed: 315 mm Swing diameter over cross slide: 200 mm Turning length: 500 mm Swing diameter over bed: 315 mm Maximum swing diameter over face slide: 200 mm Centre height measured in bed: 180 mm Spindle bore: Ø 32 mm Speed range: 56...2,800 rpm / only 6-step left-right Feed range X-axis: longitudinal: 0.02–0.8 m/min Feed range Y-axis: cross: 0.01–0.4 m/min Tailstock quill taper: MT 4 Tailstock quill travel: 140 mm Total power requirement: 5.5 kW Machine weight approx.: 2.0 t Machine dimensions approx. LxWxH: 2.1 x 1.1 x 1.4 m - Workpiece clamping via collet chuck - Travel distances: longitudinal slide = 580 mm, cross slide = 170 mm - incl. tool rest - incl. change gears - Steady rest Ø 100 mm - Four-way toolpost Nwodpfx Aheu Ix Hqj Ujg The machine is operating with restricted function! 6 spindle speeds are currently selectable! (224/1800; 280/2240; 355/2800 rpm) Sale as described.

Stanje: rabljeno, Leto izdelave: 2011, Technical details: Power: 63 kVA Nodsu Nvp Sopfx Ah Uewg Speed: 1500 rpm Power output: 50 kW (heat exchanger) Fuel type: (natural) gas Operating hours: 87,021 h Weight: approx. 2,300 kg Dimensions L x W x H: approx. 3.0 x 1.0 x 1.8 m CHP Compact Module (Heat Exchanger Module) Sound-insulated, with control cabinet Engine: MAN; Type E0834 E302; Gas Otto 4-stroke engine, 1500 rpm; Mechanical output 54 kW; Ignition control unit Motortech MIC 500 (MIC 520) Generator: Leroy Somer; Type LSA 43.2 8; Rated output 87 kVA; 1500 rpm; Voltage 400V Heat exchanger module: Make: Heattransfer; Engine cooling water output 46 kW; Exhaust heat output 33 kW; Total heat output via plate heat exchanger = 79 kW Connections for gas inlet, exhaust outlet, condensate drain, and heating water on the side. With exhaust adapter

Stanje: rabljeno, Leto izdelave: 2014, Technical Details: Swing diameter over bed: 356 mm Swing diameter over cross slide: 220 mm Turning length: 1000 mm Centre height: 180 mm Distance between centres: 1000 mm Spindle bore: 38 mm Speed range: 45 - 1800 rpm Longitudinal feeds: 0.043 - 0.653 mm/rev, 42 steps Tailstock quill taper: MT3 Tailstock quill travel: 95 mm Total power requirement: 4 kW Machine weight approx.: 0.85 t Machine dimensions approx. (LxWxH): 1.92 x 0.8 x 1.49 m (including display unit) Various accessories Nwjdpfx Ahew D Dcqe Usg

Stanje: rabljeno, Tehnične podrobnosti: Obratovalne ure: 2151 h Čas vklopa rezkalne glavne osi: 2 h Čas vklopa stružne glavne osi: 709 h Obhodni premer: 1000 mm Stružni premer: 900 mm Maks. višina obdelovanca: 800 mm Krmiljenje: Mazatrol Smoothg os X: 470 mm os Z: 876 mm os C: 20 m/min Držala za orodja / postaje: 12 Hitrost revolverja: 4000 obr/min Nsdjydvfcspfx Ah Uewg Teža obdelovanca: 3000 kg Hitri pomik v X- in Z-smeri: 24 m/min Približna masa stroja: 14 t Približne mere stroja (DxŠxV): 3989 x 2375 x 3400 mm

Stanje: rabljeno, various types; more information under Downloads Nedpfjdc A Rqjx Ah Uowg

Stanje: rabljeno, Leto izdelave: 1998, Tehnične podrobnosti: Notranji premer: 63 mm Zunanji premer: 800 - 320 mm Globina brušenja: 380 mm Dimenzije brusnega kolesa: Ø 65 x 25mm (posodasto kolo) Podajalna hitrost: 0,05 - 0,40 obr/min / 8-stopenjska obr/min Skupna potrebna moč: pribl. 1,1 kW Teža cca: 1060 kg Mere stroja cca. DxŠxV: 1,1 x 1,1 x 1,4 m Nwodpfxeu Ngauj Ah Uog Stružnica in brusilni stroj za zavorne bobne in kolute - Max./min. premer struženja in brušenja: 800 / 320 mm - Vpenjanje zavornega bobna: 63 mm, hod pinole 120 mm - Vzdolžna pomikalna miza: vzdolžna pot 380 mm; prečna pot 200 mm - Nosilec za brušenje: prečni hod 60 mm; motor = hitrost vrtenja 3410 obr/min - Upravljanje preko kontrolne plošče