Širokopasovne brusilke z delovno širino 1300–1499 mm nakup rabljenega (129)

Stanje: rabljeno, Leto izdelave: 1996, obratovalne ure: 12.171 h, BOERE Sanding Line "Compact" Elite Year of manufacture: 1996 (CE) Operating hours: 12,171 Maximum working height: 150 mm Maximum working width: 1,300 mm Elite BKKS 1300 - First motor: 45 kW - Second motor: 30 kW - Third motor: 18.5 kW - Voltage: 380 V, 183 amps Elite TKKS 1100 - First generator motor: 45 kW - Second generator motor: 30 kW - Third generator motor: 18.5 kW - Voltage: 380 V, 172 amps Rbodpfxswnh Eqo Ad Tet Overhauled by Boere in 2019 - Year of manufacture: 1996 - Documentation available: No - Undersander: - CE certificate available: No - Operating hours: 12,171 - Max. working width [mm]: 1,300 - Max. working height [mm]: 150 - Motor power first unit [kW]: 45 - Motor power second unit [kW]: 30 - Motor power third unit [kW]: 18.5 - Sanding pad available: No - Top sander: - Motor power first unit [kW]: 45 - Motor power second unit [kW]: 30 - Motor power third unit [kW]: 18.5 - Structuring brush available: No - Sanding pad available: No - Voltage [V]: 380 - Power consumption [A]: 172 Financial information VAT: The price quoted is exclusive of VAT VAT/margin scheme: VAT deductible for businesses Delivery and trade-in possible at any time for all industrial sector equipment Yorick Diebels

Stanje: rabljeno, Leto izdelave: 2002, obratovalne ure: 27.518 h, BOERE sanding machine “Compact” Elite Altrovo leto: 2002 (CE) Obratovalne ure: 27.518 Največja višina: 150 mm Največja širina: 1100 mm Elite BKKS 1100 - Prvi agregat: 30 kW motor - Drugi agregat: 18,5 kW motor - Tretji agregat: 15 kW motor - Napetost: 380 V, 128 A Elite TKKS 1100 - Prvi agregat: 30 kW motor Rsdpfjwng Hmsx Ad Tebt - Drugi agregat: 18,5 kW motor - Tretji agregat: 15 kW motor - Napetost: 380 V, 117 A - Leto izdelave: 2002 - Dokumentacija na voljo: Ne - CE certifikat na voljo: Ne - Serijska številka: - Obratovalne ure: 27.518 Finančne informacije DDV: Navedena cena je brez DDV DDV/Marginska obdavčitev: DDV je odbiten za podjetja Dostava in odkup je možno kadarkoli za vse industrijske naprave Yorick Diebels

Stanje: zelo dobro (rabljeno), Leto izdelave: 2016, Funkcionalnost: popolnoma funkcionalen, Costa K6 CCC 1350 Wide Belt Sander Year of manufacture: 2016 Technical condition: very good The Costa K6 CCC 1350 wide belt sander from 2016 is a solid industrial machine designed for the sanding and calibration of wooden surfaces. Here are the key technical specifications for this machine: - Working width: 1350 mm Rbedeukgikepfx Ad Tet - Number of sanding units: 3 The machine is equipped with a steel calibration roller, a hard rubber roller, and a soft rubber roller, ensuring highly precise sanding. Additional features: Cleaning units combining a brush with an air-blow system, hold-downs for short workpieces, and an air-blow system at every sanding unit. Weight: The total machine weight is 4,300 kg. This machine is valued for its sanding precision and ability to process large quantities of material, making it ideal for the woodworking and panel production industries.

Stanje: pripravljen za uporabo (rabljen), Leto izdelave: 1994, Operating voltage: 380V Frequency: 50Hz Weight: 7500 kg Power consumption: 172 A Year of manufacture: 1994 Calibration: Standard: 1350 x 2620 mm Cross sanding: Standard: 5400 x 150 mm Redot Dk Siopfx Ad Tobt Longitudinal sanding: Standard: 1350 x 2620 mm Machine dimensions Working width: 1300 mm

Stanje: rabljeno, Leto izdelave: 2003, Kalibrirno-brusilni stroj SCM SANDYA 20 model 20 M3 135, rabljen leto izdelave: 2003 serijska št.: AE/024903 maksimalna delovna širina: 1350 mm hitrost podajanja: 3,5-18 m/min z inverterjem delovna višina: 4-170 mm vakumska miza: 7,5 kW Sestava: I. grupa: kalibrirni valj iz utorjenega jekla D. 250 – motor 22 kW II. grupa: brusni valj d. 250, trdota 45 SH – motor z dvema hitrostma 9/11 kW vrtljaji 1400/2800 Rbsdpfsxwbydox Ad Tot III. grupa: kombinirani valj d. 170, trdota 30 SH + elastična segmentna blazinica s 46 sektorji – motor 11 kW z inverterjem IV. grupa: satinirni valj Scotch-Brite Pozicionirna miza z obdelovancem dimenzija trakov: 2620 x 1370 mm pihala za II. in III. trak samodejno centriranje transporterja elektronsko upravljanje I./II./III. valja/blazinice

Stanje: zelo dobro (rabljeno), Leto izdelave: 2002, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 4607269, skupna širina: 2.100 mm, skupna višina: 2.400 mm, skupna dolžina: 2.830 mm, delovna širina: 1.350 mm, širina brušenja: 1.350 mm, skupna masa: 2.850 kg, višina brušenja: 160 mm, moč: 22 kW (29,91 KM), vrsta nastavitve višine: električni, vrsta vhodnega toka: trifazni, hitrost transportnega traku: 20.500 mm/s, dolžina brusnega traku: 2.620 mm, višina obdelovanca (maks.): 160 mm, višina prehoda: 160 mm, priključek za stisnjen zrak: 6 letvica, širina brusilnega traku: 1.380 mm, nastavitev višine mize: 157 mm, moč pogonskega motorja podajalnika: 1.500 W, vhodna frekvenca: 50 Hz, potreba po zraku: 1 m³/h, vhodna napetost: 400 V, obratovalni tlak: 6 letvica, širina obdelovanca (maks.): 1.350 mm, 🪵 2002 Viet Challenge 223 Mehrband-Schleifmaschine – Schwerlast-Finishing, Sehr Guter Zustand Bringen Sie Ihre Holzoberflächenbearbeitung auf das nächste Level mit dieser Viet Challenge 223 Mehrband-Schleifmaschine von 2002 – die Hochleistungs-Schleiflösung für professionelle Holzbearbeitung. In Italien gebaut für Präzision und Langlebigkeit, ist die Viet Challenge 223 bei Schreinern, Tischlern und Produktionsbetrieben europaweit geschätzt. Jetzt in sehr gutem Zustand verfügbar, liefert diese Doppelschleifkopfmaschine konstant exzellente Ergebnisse auf Massivholz, furnierten Platten und Verbundwerkstoffen – ideal sowohl für Kalibrierung als auch Feinschliff. ✅ Hauptmerkmale – Viet Challenge 223/20 Baujahr: 2002 Zustand: Sehr gut – sauber, gepflegt, voll funktionsfähig Schleifaggregate: 2 (Vorschliff + Feinschliff) Arbeitsbreite: 1.350 mm Arbeitshöhe: 3 – 160 mm Mindest-Werkstücklänge: ca. 400 mm Schleifbandmaße: 1.380 mm x 2.620 mm Hauptmotorleistung: 11 kW + 11 kW (ca.) Vorschubgeschwindigkeit: stufenlos, 3,7 bis 20,5 m/min Elektrische Höhenverstellung Not-Aus und Sicherheitsvorrichtungen Vorschubmotor: 1,5 kW Hubmotor: 0,37 kW Absauggeschwindigkeit: 25 m/s Druckluft: 6 bar Luftverbrauch: 17 l/min Maschinenabmessungen: 2.830 x 2.100 x 2.400 mm Maschinengewicht: 2.850 kg 🧱 Ideal Für: Kalibrierung von Massivholzplatten Schleifen von furnierten Platten Finish von MDF und Verbundplatten Bauteile für Flachmöbel Allgemeine Holzoberflächenbearbeitung und -veredelung 📦 Lieferumfang: Viet Challenge 223 Hauptschleifmaschine Zwei Schleifaggregate für Vorschliff und Feinschliff Integrierter Vorschubtisch und Absaugstutzen Original-Bedienungsanleitung und Schutzvorrichtungen Vollständig geprüft und einsatzbereit 📍 Verfügbarkeit & Lieferung Diese Maschine ist lagernd und kann sofort besichtigt und geliefert werden. Versandunterstützung innerhalb Irlands, UK und Europas möglich. 📞 Jetzt anfragen Sie suchen eine zuverlässige Mehrband-Schleifmaschine mit professionellen Ausstattungsmerkmalen? Die Viet Challenge 223 ist in diesem Zustand und zu diesem Preis eine seltene Gelegenheit. Viet Challenge 223 Breitbandschleifmaschine zu verkaufen Gebrauchte Breitbandschleifmaschine im sehr guten Zustand Industrie-Schleifmaschine für die Holzbearbeitung Rodjwnr A Hopfx Ad Tebt Schleifmaschine für Plattenmaterial Doppelschleifkopf-Breitbandschleifmaschine für Massivholz Viet Breitbandschleifmaschine Irland / UK / Europa Breitbandschleifmaschine für Möbel- und Korpusfertigung

Stanje: rabljeno, Leto izdelave: 2004, • Cutting width (mm): 1300 • Maximum workpiece thickness (mm): 3 - 140 • Deburring unit: Brush roller diameter 150 mm • Drive for deburring unit (kW): 1.5 • Conveyor bed: 3.0 kW frequency-controlled, 4.0 kW Rbsdpfx Adjtt Slce Tot • Feed speed (m/min): 5 - 25 • Workpiece transport belt with vacuum clamping system (kW): 7.5 • Total weight (kg): approx. 7500 • Total connected load (kW): approx. 73

Stanje: dober (rabljeno), Leto izdelave: 2000, • Sanding width (mm): 1350 • Workpiece thickness (mm): 3 - 150 • Total sanding units: 2 • Longitudinal belts: 2 • Contact roller diameter = 200 mm: 1 / 15 kW • Combination unit: with small roller • Cleaning brush: 1 x diameter = 120 mm • Vacuum table • Intermediate lacquer sanding • Constant table height • Carpet cleaning • Longitudinal unit, motor: 15 kW, 1.8 - 18 m/s • Feed rate: 3 - 12 m/min • Sanding belt length, longitudinal unit (mm): 2,100 x 1,400 Redpfx Aewwlm Dsd Tsbt • Pressure beam: CSD system, electromagnetic, wear-free • Conveyor belt: new • Availability: inspected, in stock

Stanje: zelo dobro (rabljeno), Calibrating and Sanding Machine DMC Topsand 2000 4 Belts First Unit: 1 Roller Second Unit: 1 Roller Third Unit: 1 electronically segmented pad Fourth Unit: 1 electronically segmented super-finishing pad Working width: 1350 mm Vacuum conveyor system Rbedpfx Adji Dakro Tot

Stanje: zelo dobro (rabljeno), COSTA LEVIGATRICI Series S model SN with 5 units - First unit: electronically segmented transverse belt - Second unit: 1 roller - Third unit: 1 roller - Fourth unit: electronically segmented super-finishing pad - Fifth unit: electronically segmented transverse belt Working width: 1350 mm Rsdpfer Iyvmjx Ad Tobt Vacuum system Inverter on all belt units Inverter on feed conveyor Outfeed brush unit Outfeed blower unit

Stanje: zelo dobro (rabljeno), Leto izdelave: 1988, automatic wide belt sander with 2 belts for lacquers, wood, veneer, composites, and various materials Machine can be integrated into a production line Technical specifications: Working width: 1350 mm Maximum usable height: 130 mm Belt size: 2450 x 1350 mm Configuration: 1st Group: Sanding roller diameter 320 mm - grit 60 - blower cleaning belts - 11 kW motor with variator 2nd Group: Sanding roller diameter 320 mm - grit 40 - blower cleaning belts - 11 kW motor with variator Scotch Brite - 1.5 kW motor Vacuum table Rodpfx Adegmbu Ij Tebt Belt speed variator: 4–19 m/min Operating pressure: 7 bar External dimensions: Machine: 2000 x 2750 x 2200 mm Vacuum pump: 800 x 700 x 900 h mm

Stanje: kot nova (razstavni stroj), Funkcionalnost: popolnoma funkcionalen, višina brušenja: 200 mm, moč: 11,03 kW (15,00 KM), hitrost brusilnega traku: 18.000 mm/s, dolžina brusnega traku: 2.620 mm, širina brusilnega traku: 1.370 mm, vhodna frekvenca: 50 Hz, vhodna napetost: 400 V, Further Technical Data Feed speed: 2.8 - 20 m/min Rbodpfxjxtpydo Ad Tjt The new Format4 wide belt sanders findustry excel in industrial use, particularly due to the individually configurable assembly of sanding units. The machine can be equipped with two, three, or four units, tailored exactly to the specific application and area of use. This high degree of customization guarantees fulfillment of all requirements regarding surface finish and processing efficiency. Maximum Operating Comfort in Industrial Applications The clearly structured touchscreen control is intuitive to use. All machine functions are displayed graphically and clearly on the digital display. The pass-through thickness can be set to tenths of a millimeter at the touch of a button directly from the control panel. The automatic thickness measurement makes it easier to set the machine for the desired workpiece thickness. The workpiece can be measured without additional measuring devices, and the thickness is then transmitted directly “wirelessly” to the machine. The fixed infeed table height of 900 mm ensures easy and fatigue-free working. A vacuum table, roller table extensions on the infeed and outfeed sides, and optional pressure shoes on the sanding units provide optimal comfort and ideal working conditions for workpieces of any format. Optional Equipment 10E LACQUER - Cross sanding unit ESC instead of 1st contact unit 20A 2nd contact roller unit 22 2nd sanding roller in 85° Shore 30E LACQUER - Superfinish unit ESC instead of 3rd contact unit 39 Switching contact for pneumatic slide control (price/piece) *6 51 Soft start for 15 kW (20 hp motor) 59B Control unit with 15" color touchscreen 63 Scotch-Brite brush unit at machine outfeed 71 Oscillating cleaning blower for workpiece and conveyor belt 72 Ionizing bar at machine outfeed 73 Vacuum table with 4 kW (5.5 hp) blower 74 Inverter for vacuum blower for vacuum adjustment 83 Sanding height 200 mm instead of 170 mm 84 Optimized control software for special machining 87 ESC workpiece recognition sensor with 50 segments 201 2nd motor with output 15 kW Further Information Workpiece height: 3 - 170 mm Constant infeed height – fixed table: 900 mm Grooved sanding roller: Ø 250 mm Delivery and installation included in postal code area 71,72,73,77,78,79,86,87,88,89

Stanje: rabljeno, številka stroja/vozila: 138053, širina brušenja: 1.300 mm, višina obdelovanca (maks.): 160 mm, 2 sanding belts (roller - pad) Rbjdpfewmwm Iox Ad Tjt Sanding roller motor: 18.5 kW Sanding pad motor: 15 kW Feed speed: 3 - 15 m/min Weight: approx. 2,200 kg

Stanje: zelo dobro (rabljeno), Leto izdelave: 1992, Funkcionalnost: popolnoma funkcionalen, Širokopasovni brusilni stroj, brusilnik 1300mm Proizvajalec: Ott Model: RSO-1300 Leto izdelave: 1992 Delovna širina: 1300mm z valjem 15 kW Rodpfx Adjx E Amqj Tebt in čevljem 11 kW + krtača Hitrost pomika: 10m in 20m

Stanje: rabljeno, Leto izdelave: 2007, Bütfering SCO 313 QEH 1. Jednotka pro příčné broušení „Q“ Šířka segmentu: 25 mm Typ jednotky: příčná brusná jednotka s elektronickým přítlačným nosníkem Přítlačný element: systém CPS 2 s variabilním tlakem pro broušení i hrany Výkon agregátu: 13,5 kW Redpfx Ajw Sh Aped Tjbt Rychlost pásu: 1–16 m/s Rozměr pásu: 5360 x 150 mm Ofuk pásu 2. Agregát s elektronickým přítlačným nosníkem „E“ Šířka segmentu: 25 mm Typ jednotky: jednotka s elektronickým přítlačným nosníkem Přítlačný element: systém CPS 2 s variabilním tlakem pro broušení i hrany Výkon agregátu: 7,5 kW Rychlost pásu: 2–18 m/s Rozměr pásu: 2620 x 1350 mm Ofuk pásu 3. Agregát s tlakovým lamelovým pásem „H“ Šířka segmentu: 25 mm Typ jednotky: jednotka s elektronickým přítlačným nosníkem a vnitřním lamelovým pásem Přítlačný element: systém CPS 2 s variabilním tlakem pro broušení i hrany Výkon agregátu: 20 kW Rychlost pásu: 1,5–12 m/s Rozměr pásu: 2620 x 1350 mm Ofuk pásu Rok výroby: 2007 Cena: 17.500,-

Stanje: rabljeno, Leto izdelave: 2006, Funkcionalnost: nepreverjeno, SANDING LINE CONSISTING OF 3 MACHINES: LOWER UNIT WITH TWO PAD BELTS; UPPER UNIT WITH TWO PAD BELTS; SIDE UNIT WITH ONE BELT AND TWO BELT EDGE SANDERS; SUITABLE FOR BEAMS UP TO 800x300 mm Redpsw E Eu Rsfx Ad Tobt INCLUDING INFEED AND OUTFEED ROLLER CONVEYORS TOTAL POWER: 34 kW

Stanje: skoraj kot novo (rabljeno), Funkcionalnost: popolnoma funkcionalen, delovna širina: 1.350 mm, Calibrating and sanding machine, automatic, with 2 belts, model COSTA SK 5 CC 1350 Excellent working condition, machine as new Inverter on 1st belt: YES Inverter on 2nd belt: YES Inverter on conveyor: YES Fixed table, movable head CE-compliant machine: YES Rsdpfxou Dmnbe Ad Tobt Operating manual, CE declaration of conformity: YES For wood, furniture, custom-made interior fittings, wooden window frames, doors, panels, composite materials, plastic materials, and others. Technical specifications: Max. working width: 1350 mm Max. working height: 160 mm Min. working height: 4 mm Abrasive belt dimensions: 1380 x 2620 mm Feed speed with inverter from 3 to 15 m/min (motor power: 1.1 kW) Automatic centering Perforated conveyor (no vacuum unit included) Configuration (2 belts, 2 independent motors): 1st unit: Rubber calibrating roller group – diameter 200 mm – Shore 85 – motor power 10 HP with inverter Automatic cleaning blower for abrasive belts 2nd unit: Rubber sanding roller group – diameter 330 mm – Shore 45 – motor power 10 HP with inverter Automatic cleaning blower for abrasive belts Automatic-engaging brake Infeed roller conveyor Outfeed roller conveyor Weight: 2000 kg Voltage: 380/50

Stanje: dober (rabljeno), Leto izdelave: 2009, I am selling a Costa SA1 TT 1350 wide belt sander, year of manufacture 2009. Configuration: - 1 pc. electronic segmented pad - 1 pc. electronic segmented pad - 1 pc. cleaning unit Working width: 1350 mm Belt dimensions: 1380 x 2620 mm Pressure rollers for short workpieces Compressed air cleaning for both units Final cleaning unit with extraction Total weight: 3400 kg Design intended for integration in production lines, featuring stable working height and movable units 2 motors, total power 31 kW Documentation included Condition: very good Available immediately Rjdpfx Ajvxlg Isd Tebt

Stanje: zelo dobro (rabljeno), Leto izdelave: 2011, I am selling a COSTA B FFFF 1350 wide belt sander, year of manufacture 2011. Configuration: 4 units brush aggregate with brush head included Cleaning unit combined brush and air-blow at the rear Working width: 1350 mm Vacuum underpressure table with integrated fan Line construction, with fixed working height and movable units 4 motors, total power 32 kW Rodpfxsvxfaho Ad Tsbt Condition: very good! Available immediately.

Leto izdelave: 2001, Stanje: dober (rabljeno), I am selling a wide belt sander Costa SA2 TS 1350, year of manufacture 2001. Configuration: Electronic segmented pad – brush head. Rbodpfx Adsg Trufe Tet Working width: 1350 mm. Abrasive belt dimensions: 1380 x 2620 mm. Pressure rollers for short workpieces. Compressed air cleaning for both units. Total weight: 2,600 kg. Main motor: 11 kW. Final cleaning unit with extraction. Including documentation. Condition: good. Available immediately.

Stanje: zelo dobro (rabljeno), Leto izdelave: 2006, Technische Daten: - Arbeitsbreite: 1350 mm - Pneumatische Oszillation - Vakuumtisch - Stand-alone Maschine (Tischhub/-senkung) 1. Kombi-Aggregat: - Motorleistung: 18,5 kW - Stahlkalibrierwalze - Stufenlose Bandgeschwindigkeitsregelung - Segmentiertes Schleifpad (52 Segmente à 26 mm) 2. Kombi-Aggregat: - Segmentiertes Schleifpad (52 Segmente à 26 mm) - Motorleistung: 7,5 kW - Stufenlose Bandgeschwindigkeitsregelung Rbsdevdtxiepfx Ad Tjt - Bürste am Materialauslauf - Stufenlose Vorschubregulierung - Pneumatische Bandreinigung

Stanje: novo, Leto izdelave: 2025, Machine neuve Année de fabrication : 2025 Équipement et données techniques : Rbodpfxew Tfwtj Ad Tet MODÈLE : Excel 2NRKRT MACHINE À 2 BANDES 1ÈRE BANDE : ROULEAU 2ÈME BANDE : AGRÉGAT COMBINÉ (ROULEAU/SABOT) POUR BOIS MASSIF, VÉNÉR ET PONÇAGE INTERMÉDIAIRE DE LAQUE - LARGEUR DE TRAVAIL UTILE : 1350 mm - LONGUEUR DE LA BANDE ABRASIVE : 1370 x 2150 mm - ÉPAISSEUR MAX. DE LA PIÈCE : 160 mm - ROULEAU D’ÉTALONNAGE ACIER : 180 mm - ROULEAU DE PONÇAGE REVÊTU DE CAOUTCHOUC : 180 mm - LARGEUR DU SABOT DE PONÇAGE : 50 mm - PUISSANCE MOTEUR BANDE : 14,7 kW - VITESSE DE BANDE : 18/16 m/s - PUISSANCE MOTEUR D’AVANCEMENT : 0,75 CV - Tapis d'avance avec vitesse réglable en continu : 4/20 m/min - MOTEUR DE RÉGLAGE EN HAUTEUR : 0,33 CV - OSCILLATION MÉCANIQUE DE BANDE : "ECO GEAR PATENT SYSTEM" - 1 PIÈCE FREIN À TAMBOUR pour arrêt de bande - ROULEAU BASCULANT pour tension de bande - 3 PIÈCES ROULEAUX DE PRESSION avec revêtement en caoutchouc - BARRE ARRÊT D’URGENCE à l'entrée Disponibilité : immédiate Emplacement : Flörsheim

Stanje: zelo dobro (rabljeno), Leto izdelave: 2006, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: SA005556, skupna širina: 1.350 mm, skupna masa: 4.000 kg, dolžina brusnega traku: 2.620 mm, višina obdelovanca (maks.): 170 mm, priključek za stisnjen zrak: 6,5 letvica, širina mize: 1.350 mm, vhodna frekvenca: 50 Hz, vhodni tok: 130 A, širina obdelovanca (maks.): 1.320 mm, The grinder has undergone a complete service inspection and the conveyor belt has been replaced. Rodpsvk Tmaofx Ad Tobt

Stanje: zelo dobro (rabljeno), Leto izdelave: 2008, Funkcionalnost: popolnoma funkcionalen, moč: 44,7 kW (60,78 KM), Tehnični podatki: Obratovalna višina: 900 mm Obratovalna širina: 1350 mm Maks. debelina obdelovanca: 99 mm Min. debelina obdelovanca: 0,8 mm Dimenzije stroja: Teža: cca 4800 kg Širina: cca 2800 mm Rsdpfx Adewnw E To Tsbt Dolžina: cca 3460 mm Višina: cca 2440 mm Stroj smo kupili leta 2020 in ga obnovili. Priložen je nov transportni trak.

Stanje: zelo dobro (rabljeno), Leto izdelave: 1999, Funkcionalnost: popolnoma funkcionalen, delovna širina: 1.350 mm, širina brušenja: 1.350 mm, višina brušenja: 160 mm, 1. Aggregat-Walze zum Kalibrieren 2. Aggregat mit Elektronikschuh 3. Aggregat mit Elektronikschuh Rbsdpfx Aswhqmwed Tet Stabile Industriemaschine zum Kalibrieren, Feinschleifen und Lackschliff