Studer S20-2 pirkti naudotą (78 854)

Būklė: labai geros būklės (naudotas), veikimo valandos: 4 589 h, Funkcionalumas: visiškai funkcionalus, centro aukštis alkūniniame velene: 100 mm, centro aukštis: 100 mm, šlifavimo ilgis: 400 mm, Studer S20-2 darbo valandos: 4589 centro aukštis: 100 mm maks. šlifavimo ilgis: 400 mm vidinis ir išorinis šlifavimas papildomas špindelis aušinimo vandens filtravimo įrenginys daug priedų spinta Gedpfsy R D Rnox Ah Aoub dokumentacija mašina prijungta prie elektros inspekcijai

Būklė: visiškai atnaujintas (naudotas), mašinos/transporto priemonės numeris: 1015.54, Pilnai renovuotas apvalus šlifavimo staklės. Atstumas tarp centrų – 400 mm, centrų aukštis – 100 mm. Techniniai duomenys ir priedai pagal atskirą PDF. Guedpfx Aoy Hhk Deh Aeb

Būklė: visiškai atnaujintas (naudotas), Gamybos metai: 2025, IMMEDIATELY AVAILABLE Studer S20-2 – Mechanically Overhauled Grinding length: 400 mm Centre height: 100 mm Table adjustment: 30° Bore diameter: 127 mm Grinding wheel dimensions: 350x32 mm WSS spindle taper: MT4 (fixed and revolving centre) RST spindle taper: MT2 Quill travel: 20 mm Workpiece weight: 20 kg Tailstock with manual cylindrical error correction Additional optional features: - Glass scale on X and Z axes - Internal grinding attachment - Grinding wheel flange - LED spot with flexible arm - Coolant unit Gusdpfx Aofg Tbrjh Ajb - Safety device

Būklė: naudotas, Gamybos metai: 1987, Šlifavimo skersmuo: 200 mm Šlifavimo ilgis: 400 mm Smailių aukštis: 100 mm Gujdevw Duujpfx Ah Asb Geometriškai atnaujinta ir naujai perdažyta Su vidinio šlifavimo įranga Priedai pagal užklausą Mašiną galima apžiūrėti pas klientą prijungtą prie elektros nuo 2025 m. iki 2026 m. sausio pabaigos.

Būklė: naudotas, TECHNICAL DATA - Centre height: 100 [mm] - Distance between centres: 650 [mm] - Max. table swivel: [degrees] - Travel: 650 [mm] - Feed rate: 100 – 3500 [mm/min] GRINDING WHEELHEAD SPINDLE STOCK - Swivel range: [degrees] - T1 Grinding wheel dimensions: 350 x 32 x 127 [mm] - Power: 3 [kW] - Speed: 1600 – 2200 [rpm] - Peripheral speed: [m/s] WORKPIECE HOLDER HEADSTOCK - Spindle speed: up to 1200 [rpm] - Power: 0.5 [kW] - Taper: MT4 - Max. workpiece weight: 20 [kg] - Swivel range: 0 – 90 [degrees] ELECTRICAL SUPPLY - Supply voltage: 400 [V] Gsdpfx Ahoxrg Hxs Asub - Connected load: 8 [kVA] WEIGHT AND DIMENSIONS - Footprint: 00 x 00 [mm] - Machine height: 1650 [mm] - Machine weight: 1900 [kg] MACHINE HOURS - Power-on hours: 01 [h] ACCESSORIES - Sony LG20-2 display unit - Automatic contact recognition: SENSITRON 6 - 1 tailstock with fine adjustment - 2 internal grinding spindles: 20,000 / 60,000 [rpm] - Fixed dressing device - Coolant tank - 1 steady rest with three jaws - 3-jaw chuck Ø 100 mm - Various grinding wheels

Būklė: visiškai atnaujintas (naudotas), Funkcionalumas: visiškai funkcionalus, centro aukštis: 100 mm, šlifavimo ilgis: 650 mm, Vidaus ir išorės apvalaus šlifavimo staklės Studer S20-2 Atstumas tarp centrų: 650 mm – Centras aukštis: 100 mm Priedai pagal užklausą! Paruošta pristatymui! Gjdpfxoqv Eg Re Ah Aeub

Būklė: nepatikrintas (naudotas), Gamybos metai: 1995, Funkcionalumas: nepatikrintas, Atstumas tarp centrų: 650 mm ID / OD Gusdpfxeyr Nn He Ah Asb 2 ašių SONY skaitmeninis atvaizdavimas Aušinimo skysčio rezervuaras Daugiau informacijos pagal užklausą.

Būklė: dilaminuotas dirbtuvėje (naudotas), Funkcionalumas: visiškai funkcionalus, centro aukštis: 100 mm, ruošinio svoris (maks.): 20 kg, šlifavimo ilgis: 400 mm, šlifavimo disko skersmuo: 350 mm, atstumas tarp centrų: 400 mm, paskutinio kapitalinio remonto metai: 2026, CHARAKTERISTIKOS : Atstumas tarp centrų: 400 mm Centro aukštis: 100 mm Gujdpsycim Djfx Ah Ajb Darbinė eiga Z ašimi: 100 - 3500 mm/min Stalo pasvyrimo kampas: 0 - 30 ° Šlifavimo veleno variklio galia: 3 kW Maks. šlifavimo ratuko skersmuo: 350 mm Maks. šlifavimo ratuko plotis: 30 mm Šlifavimo ratuko skylė: 127 mm Ruoinio veleno nosis: W20 Min. ruoinio veleno greitis: 30 aps./min Maks. ruoinio veleno greitis: 1200 aps./min Maks. detalės svoris laikiklio galvutėje tarp centrų: 20 kg Ruoinio sukinėjimo diapazonas: 0° / +90° Ruoinio veleno variklio galia: 0,5 kW Uodegos tipo tvirtinimas: MT2 Uodegos movos eiga: 20 mm Staklių matmenys: 2350 x 1480 mm Svoris: 1600 kg

Būklė: visiškai atnaujintas (naudotas), Gamybos metai: 2025, veikimo valandos: 36 h, Funkcionalumas: visiškai funkcionalus, mašinos/transporto priemonės numeris: 1024-54, Country of manufacture: Switzerland Voltage: 380/50/3 Net weight: approx. 1600 kg Customs tariff number: 8460.2920 Dimensions: 235x155x145 cm TECHNICAL SPECIFICATIONS: MAIN DIMENSIONS: Center height: 100 mm Distance between centers: 400 mm LONGITUDINAL SLIDE: Max. travel: 420 mm Minimum automatic travel: 1 mm Traverse speed: 100–3500 mm/min Reversal delay: 0–5 sec. Maximum table swivel 400/650 mm: 30°/15° TRANSVERSE SLIDE: Max. travel: 170 mm Rapid traverse: 30 mm Plunge depth in diameter: 1.9 mm Feed 1: 0.03–1.5 mm/min Feed 2: 0.02–0.3 mm/min Plunge feed per pulse: 0.0005–0.025 mm GRINDING SPINDLE HEADSTOCK: Wheel: dia. x width x bore: 350x32x127 mm Drive power: 3 kW Peripheral speed vs: 30 m/s Spindle speed: 1600/1975/2200 rpm Manual traverse: 120 mm Swivel to the right: 15°/30° Optional guard for wheel pack, max. width: 50 mm WORKPIECE HEADSTOCK: Swivel range: 0°–90° Speeds nw: 80/175/380/800 rpm Internal taper: Morse 4 Clamping collets: W-20 Drive power: 0.5 kW Max. workpiece weight: 20 kg Load during external grinding: 12 Nm Continuous drive option, speed range I: 30–300 rpm Continuous drive option, speed range II: 120–1200 rpm TAILSTOCK: Internal taper: Morse 2 Quill stroke: 20 mm GUARANTEED WORKING ACCURACY: Generator straightness: Between centers: 400 mm Measured over 400 mm: 0.002 mm Between centers: 650 mm Measured over 650 mm: 0.003 mm Roundness accuracy for external grinding: 0.0004 mm CONNECTION VALUES: Power consumption: max. 8 kVA Permissible voltage fluctuations: –15% to +10% Permissible frequency fluctuations: +/- 3% Compressed air: 5 bar Gjdpfx Ahjw T Sc No Aoub Unless otherwise stated, the technical data is provided without obligation and subject to errors or omissions.

Būklė: naudotas, TECHNICAL DATA Gujdsuhby Repfx Ah Ajb - Centre height: 100 mm - Centre distance: 650 mm - Internal grinding length: 100 mm - Internal grinding diameter: 3 to 40 mm - Max. table swivel: 30° - Workpiece holder headstock * Spindle speed (variator): 60–1200 rpm * Motor power: 0.5 kW * Internal taper: Morse 4/2 - Grinding wheel dimensions: 350 x 30 x 127 mm - Grinding wheel headstock * Power: 3 kW * Swivel range: 15/30° - Max. workpiece weight: 20 kg - Total power consumption: 5 kW WEIGHT AND DIMENSIONS - Required floor space: 3000 x 1400 mm - Machine height: 1600 mm - Machine weight: 1900 kg EQUIPMENT - Complete internal grinding attachment: 45,000 rpm - 1 complete cooling unit - 1 tailstock with fine adjustment - 1 reversible and adjustable dressing device - 1 swivelling diamond holder - Digital display, 2 axes X and Y - 3-point steady rest

Būklė: dilaminuotas dirbtuvėje (naudotas), STUDER S 20-12 yra apvaliojo šlifavimo staklės, užtikrinančios preciziškumą, aukštą tikslumą ir patikimumą. Talpa: centrų aukštis – 100 mm, centrų atstumas – 400 mm; diskas Ø300×30 mm, angos skersmuo 127 mm; ruošinio špindelis 20°, stalo posvyrio kampas 30°. Duomenys: ruošinio apsisukimų dažnis 60–1200 aps./min (be pakopų); disko sukimosi dažnis iki 45 000 aps./min; stalo padavimo greitis 100–3500 mm/min; šlifavimo variklis 4,5 AG; 3×380 V; svoris apie 1900 kg; matmenys 1500×1400×1600 mm. Svarbi komplektacija: pakreipiama vidinio šlifavimo įranga, atraminės įtaisai, Ø120 mm magnetinis griebtuvas. Pasiekia griežtus nuokrypius; pramonės šakos: automobilių, aviacijos, įrankių gamyba, medicinos inžinerija, laikrodžių pramonė. Guodjyxn I Topfx Ah Aob

Būklė: naudotas, TECHNICAL DATA - Centre height: 100 [mm] - Distance between centres: 650 [mm] Guodpfoyn R I Hex Ah Asb - Maximum table swivel: [degrees] - Travel: 650 [mm] - Feed rate: 100 - 3500 [mm/min] GRINDING WHEEL SPINDLE HEADSTOCK - Swivel range: [degrees] - T1 grinding wheel dimensions: 350 x 32 x 127 [mm] - Power: 3 [kW] - Speed: 1600 - 2200 [rpm] - Peripheral speed: [m/s] WORKPIECE HEADSTOCK - Spindle speed: - 1200 [rpm] - Power: 0.5 [kW] - Taper type: MT4 - Max. workpiece weight: 20 [kg] - Swivel angle: 0 - 90 [degrees] ELECTRICAL SUPPLY - Supply voltage: 400 [V] - Power: 8 [kVA] WEIGHT AND DIMENSIONS - Space requirement: 00 x 00 [mm] - Machine height: 1650 [mm] - Machine weight: 1900 [kg] OPERATING HOURS - Power-on hours: 01 [h] ACCESSORIES - Sony LG20-2 display - Automatic contact detection: SENSITRON 6 - 1 tailstock with fine adjustment - 1 internal grinding spindle - Fixed dressing device - Coolant tank - 1 steady rest with three fingers

Būklė: geras (naudotas), Gamybos metai: 2007, Boge S20-2 Screw Compressor Fully automatic, internally completely piped and wired compact unit, single-stage, oil-injected compression, air-cooled, soundproofed. Gusdowlc Tkepfx Ah Ajb Final pressure: 10.00 bar Motor power: 15.00 kW Free air delivery: 2.24 m³/min

Būklė: naudotas, Gamybos metai: 1992, Technical details: Grinding diameter: 50 mm Grinding length: 100 mm Centre height: 100 mm Gedpfxoy Nk Hyj Ah Ajub Centre width: 200 mm

Būklė: geras (naudotas), Studer S30-12 Cylindrical Grinding Machine TECHNICAL DATA Main Dimensions Centre Height: 125 mm Distance Between Centres: 400 / 700 / 1025 mm Maximum Longitudinal Slide Travel: 400 / 700 / 1000 mm Longitudinal Slide Table Speed: 50 – 5000 mm/min Reversal Delay: 0-6 s Minimum Automatic Travel: 1.5 mm Max. Travel: 400 / 700 / 1020 mm Max. Table Swivel: 12 / 30 / 78° Cross Slide Swivel Range: ±45° Rapid Adjustment: 40 mm Feed Travel with Handwheel: 20 mm Maximum Plunge Depth: 1.7 mm Grinding Spindle Headstock Grinding Wheel Diameter x Width x Bore: 450 x 80 x 203 mm Rotational Speed: 1340 / 1500 / 1625 / 1800 / 2000 / 2200 rpm Coarse Adjustment: 210 mm Workpiece Headstock Swivel Range: 0 – 90° Speed Range: 30 – 675 rpm Taper Mount: Morse 5 Collets: W25 Tailstock Taper Mount: Morse 3 Quill Travel: 30 mm Total Power Requirement: 5 / 8.25 kW No liability is accepted for the correctness, completeness or accuracy of the information provided. Guedpfovca Izjx Ah Asb

Būklė: naudotas, Gamybos metai: 2002, Grinding diameter: 250 mm Grinding length: 400 mm Centre height: 125 mm Control system: Fanuc 21i-T Machine serviced and partially overhauled. - New grinding spindle bearings - New X-axis spindle - Upper table re-ground - New table geometry - New geometry between WSS and grinding spindles B-axis with 1° Hirth serration Longitudinal positioning HF internal grinding spindle Godpfevx Dvuox Ah Asub GAP control Paper band filter

Būklė: naudotas, Gamybos metai: 1998, Centrų aukštis: 125 mm Centrų atstumas: 400 mm Valdymas: FANUC 21i Gedpfxexwdwfj Ah Asub Disko skersmuo maks.: 406 mm Disko matmenys: 406 x 127 x 40 mm Detalės svoris: 30 kg Išilginio stalo eiga: 483 mm Skersinio stalo eiga: 254 mm Didžiausias bendras galingumo poreikis: 20 kVA Staklių svoris apie 4,0 t Užimamas plotas apie 3,0 x 2,0 x 2,1 m Komplekte: - 2 vnt. vidinio šlifavimo verpstės - B ašis (1° Hirt, valdoma) - C ašis - Quick-Set matavimo jutiklis - Sensitron sistema - Hidraulinis atlenkiamas profiliatorius - Magnetinis griebtuvas - Kiti smulkūs priedai - Dokumentacija Be aušinimo sistemos – anksčiau buvo prijungta prie centrinio įrenginio Įjungimo valandos apie 71.000 h Verpstės darbo valandos apie 25.900 h

Būklė: naudotas, Round grinder Center height 125 mm Center width 650 mm Grinding diameter 250 mm Grinding wheel diameter 400 mm Total power requirement 8 kW Weight approx. 2500 kg This is a machine from Machines4you Gsdpfx Ajgfqn Njh Aeub

Būklė: naudotas, Gamybos metai: 1982, Grinding diameter: 250 mm Grinding length: 650 mm Centre height: 125 mm Internal grinding spindle speeds, stepless: 9,500–50,000 rpm Workpiece table speed, stepless: 50–10,000 mm/min Workpiece headstock swivelling: 90 degrees Max. grinding wheel diameter: 400 mm Spindle bore: 30 mm Grinding length – plunge grinding: 80 (100) mm Max. grinding depth for internal grinding: approx. 170 mm Max. grindable bore diameter: 90 mm Feed rate: 240 mm/min Max. workpiece weight: 80 kg Coolant consumption: 36 l/min Centre distance: 650 mm Distance workpiece spindle to taper point: 960 mm Spindle motor drive power: 6.25 kW Connected load: approx. 10 kW Total power requirement: 8.5 kW Machine weight approx.: 3.4 t Space requirements approx.: 3.9 × 2.5 × 1.85 m With Studer control, electric/hydraulic drive, stepless speed adjustment, tailstock with fine adjustment and hydraulic retraction, workpiece headstock with increased accuracy, table air lift, hydraulically retractable dressing device, radius dressing device, hydro-cyclone filter, automatic grinding wheel balancing unit, automatic dressing cycle with speed compensation, internal grinding attachment. Gjdpjcxxubsfx Ah Aoub

Būklė: naudotas, TECHNICAL DATA - Centre Distance: 200 [mm] - Centre Height: 100 [mm] - Travel (X/Z): 130 / 170 [mm] GRINDING WHEEL HEADSTOCK - Wheel Dimensions: 400 x 63 x 127 [mm] - Peripheral Speed: 45 [m/s] - Power: 3 [kW] - Orientation: 30 [°] WORKPIECE SPINDLE HEADSTOCK - Taper: MT4 - Speeds: 600 - 3000 [rpm] - Power: 0.5 [kW] - C-Axis Indexing Accuracy: +/- 0.5 [°] TAILSTOCK - Taper: MT2 - Quill Stroke: 30 [mm] ELECTRICAL SUPPLY - Voltage: 400 [V] - Frequency: 50 [Hz] - Installed Power: 19 [kVA] Gedouhbxmepfx Ah Asub DIMENSIONS - Footprint: 1760 x 2180 [mm] - Height: 2630 [mm] - Weight: 4,000 [kg] MACHINE HOURS - Power-On Hours: 46,943 [h] - Operating Hours: 21,529 [h] ACCESSORIES - CNC: FANUC 16TB - Options: Studer Release B, Pictogramming - Interface: RS232C - Electronic Offset Levers - Direct measuring systems on X and Z axes - Tailstock with fine concentricity adjustment - Hydraulic retraction of tailstock quill - Swiveling dressing disc on table: FISCHER AES-72x230/3 - Grinding wheel dynamic balancing: DITTEL HBA 4000 - Diameter measurement system: MOVOMATIC ES400 - Loading/Unloading robot system: FELSOMAT - Automatic front door - Coolant system - Electrostatic extraction: ELOSTA BF2000 - Pneumatic collet chuck - 1 grinding wheel holder - 1 grinding wheel - Carrying arm for zero-G grinding wheel change - 1 balancing shaft

Būklė: naudotas, TECHNICAL DATA - Centre height: 125 [mm] - Distance between centres: 400 [mm] - Grinding wheel dimensions: 400 x 127 x 50 [mm] - Power: 4 [kW] - Max. workpiece weight: 30 [kg] - Space requirements: 3000 x 3520 [mm] - Weight: 4000 [kg] ACCESSORIES - FANUC 21i-T CNC - B-axis with 1° accuracy - 3-jaw chuck - Toolholder flanges - 1 external grinding wheel - 1 dressing device - Tailstock with fine adjustment Gedsuhbxtopfx Ah Aeub - 1 internal grinding attachment with spindle 42,000 rpm - Coolant tank with paper filter - Workpiece probe

Būklė: naudotas, TECHNICAL DATA - Number of axes: 5 - Distance between centers: 400 mm - Usable diameter: 180 mm LINEAR AXES - Travel X1 and X2 x Z: 220 mm - Travel Z: 850 mm - Resolution X x Z: 0.0001 mm Godpfevxw A Uex Ah Aeub TURRET: - Number of fixed positions: 12 - Tool holder: VDI30 GRINDING WHEEL SPINDLE - External grinding right: * Grinding wheel dimensions (Ø x width x bore): 400 x 50 x 127 mm * Drive power: 6.8 kW WORKPIECE SPINDLE HEAD - Max. spindle speed: 7500 rpm - Synchronous speed: 1 - 5000 rpm - Taper type: MT4 - Drive power: 10.5 kW - C-axis: 0.001° SYNCHRONIZED COUNTER SPINDLE - Max. spindle speed: 7500 rpm - Synchronous speed: 1 - 5000 rpm - C-axis: 0.001° - Internal taper: MK4 - Micrometric adjustment: +/- 40 micron - Drive power: 10.5 kW POWER SUPPLY - Power: 45 KVA DIMENSIONS - Space requirement: 2800 x 3960 mm - Machine weight: 7600 kg MACHINE HOURS - Power-on hours: 57,000 h ACCESSORIES - CN FANUC 310i-modelA - StuderWIN software - RS232 / USB interface - External electronic handwheel - Turret with automatic length calibration Renishaw LP2 - Marposs measuring probe for diameter (Multirange) + Z4 axis for positioning - Semi-automatic grinding wheel balancing MPM.3 BMT100 M.24 - Coolant tank 480 L * with paper filter * with magnetic filter - Chip conveyor - Mist extraction unit - Cooling unit for grinding wheel motor - Electronic touch detection Dittel AE6000 - Stationary dressing device at workpiece spindle head - Control cabinet air conditioning - Balancing arbor - Interface for automatic loading system

Būklė: naudotas, TECHNICAL DATA - Number of axes: 6 - Center height: 175 mm - Distance between centers: 650 mm LINEAR AXES - Grinding length: 800 mm - Strokes X x Z: 310 x 850 mm GRINDING WHEEL HOLDER HEADSTOCK - Continuous orientation (B axis): +/- 9° - B axis precision (High speed machining): 0.001° - External grinding wheel dimensions: 500 x 80 x 20 mm - Grinding wheel holder headstock power: 12.5 kW - Rotational speed: 1400–3200 rpm WORKPIECE HOLDER HEADSTOCK - Taper type: ISO50 - C axis indexing precision: 0.001° - Power: 4 kW - Rotational speed: 1–1000 rpm SYNCHRONIZED TAILSTOCK - Taper type: CM4 - Quill stroke (W axis): 90 mm - Quill diameter: 50 mm - Power: 1.6 kW - Max. workpiece weight between centers: 50 kg ELECTRICAL SUPPLY - Supply voltage: 400 V 50 Hz MACHINE HOURS - Number of operating hours: 36,000 ACCESSORIES - CNC control FANUC 31i-A - Software: * StuderWIN * Pictogramming * StuderThread only cycles * StuderTechnology - Remote control with electronic handwheel - Linear scales on X and Z axes - Automatic length gauging arm MOVOMATIC C25 - In-process external diameter gauging arm MOVOMATIC DM205 - Coolant tank 375 liters - Paper filter - Oil mist extraction - Arm for grinding wheel loading Gjdpju Haf Esfx Ah Ajub - Powered dressing by handwheel (100 mm diameter) on table - SENSITRON - Automatic dynamic balancing Dittel M6000 - Grinding wheel holder flanges - Interface for AROBOTECH steady rest - B3 PROFIBUS interface for automatic loading

Būklė: labai geros būklės (naudotas), BOGE S20 sraigtinis kompresorius, įrenginys po aptarnavimo Techniniai duomenys Našumas: 2,06 m³/min (2060 L/min); variklio galia 15 KW; maksimalus slėgis: 10 bar; dirbta valandų: 4823 h; grynasis kaina: 7800 PLN bruto kaina: 9594 PLN Žemiau nuoroda į vaizdo įrašą. Gusdjw Niawepfx Ah Aeb

Būklė: naudotas, Gamybos metai: 2018, veikimo valandos: 3 560 h, kėlimo aukštis: 1 660 mm, laisvas kėlimas: 200 mm, kuro tipas: elektrinis, stiebo tipas: dupleksas, šakių ilgis: 1 150 mm, bendras aukštis: 1 400 mm, bendras ilgis: 2 900 mm, bendras plotis: 800 mm, spalva: pilkas, Tuščias svoris: 1.975 kg Kėlimo talpa: 2.000 kg Gusdpfx Ajwtx Eloh Aeb - Pagaminimo metai: 2018 - Dokumentacija prieinama: Ne - CE žymėjimas: Taip - CE sertifikatas: Ne - Serijos numeris: F20282J00125 - Darbo valandos: 3560 - Tipas: Važiuojamas krautuvas - Kėlimo galia: 2000 kg - Kėlimo aukštis: 1660 mm - Praėjimo aukštis: 1400 mm - Laisvas kėlimas: 200 mm - Šakių ilgis: 1150 mm - Šakių plotis: 550 mm - Parinktys: Dvigubas krovimas - Stiebas: Duplex - Pavara: Elektrinė - Markė/modelis: Still - Akumuliatoriaus įtampa: 24V - Transporto matmenys: 2900 mm x 800 mm x 1400 mm (ilgis x plotis x aukštis) - Transportavimo svoris: 1975 kg - Transportavimo vienetų sk.: 1 Finansinė informacija PVM: Nurodyta kaina be PVM PVM/skirtumo apmokestinimas: PVM atskaitomas įmonėms Pristatymas ir įrenginių priėmimas kaip užmokestis galimi bet kokiai pramonės įrangai Tess van den Boom