Used Pegas Gonda 500X750 Horizontal X for sale (52,546)

Condition: good (used), Year of construction: 1980, Heavy lathe, turning machine, lathe, center and feed screw lathe, center and feed screw lathe -Manufacturer: VDF Heidenreich Harbeck, lead screw lathe type V3 -Turning length: 1700 mm -Turning Ø over bed: 500 mm -Turning Ø over support: 300 mm -Spindle bore: Ø 57 mm -Spindle speeds: 19 - 2000 rpm -Key bar chuck: Forkardt Ø 250 mm -Tailstock mount: MK4 -Bezel: 150 mm Dkelqetvhrys H Tcqjl -Drive: 7.5 kW -Accessories: keyless collet, tool holder, tools see photos -Dimensions: 1440/3370/H1515 mm -Weight: 2510 kg

Condition: used, Surface Grinding Machine BURDETT type No 70 - 18" x 6" Travel X: 350 mm Travel Y: 150 mm Maxi grinding height: 180 mm Manual magnetic chuck Magnetic chuck dimensions: 350 x 150 mm Grinding wheel dimensions: Ø 210 mm x thickness 25 mm X and Y Axes: auto pass taking Z Axe: manual Lubricant tank Voltage : 380 V Dimensions (L x W x H): 1300 x 1200 x 1700 mm Dkolq H Towfgrkocqsl Weight: approx 1 T

Condition: excellent (used), Year of construction: 2019, Functionality: fully functional, 1 x Goodnature Inc. juicer. The juicer shreds vegetables, fruit and root vegetables and hydraulically presses them into juice (cold-pressed juice) without heating. Suitable for continuous use (professional kitchens, smoothie bars, etc.) without risk of overheating. Model - Mini X-1. Year – 2019. Size of the squeezing batch 1,3-1,5 litres. Electrical requirements - Operates on mains power 230V. Condition – Excellent, almost as new. The juicer was used occasionally between 2019 and 2021. Dkjlq Howd Umtj Tcqjl

Condition: ready for operation (used), Year of construction: 2011, Functionality: limited functionality, travel distance X-axis: 630 mm, travel distance Y-axis: 630 mm, travel distance Z-axis: 630 mm, table width: 500 mm, table length: 500 mm, rotational speed (max.): 10,000 rpm, Equipment: chip conveyor, documentation/manual, rotational speed infinitely variable, Hüller Hille nb-h95 Year of manufacture 2011 Siemens 840D SK40 Tool magazine 100 tools Chip conveyor Belt filter Internal coolant system The machine was delivered as a 2-station pallet changer and later retrofitted with a Kirchgässner 8-station pallet storage system. The machine is running perfectly and can be inspected under chip load. The pallet changer currently has an electrical problem (feed card), which will be fixed upon purchase. You can take over the machine ready for operation, or, upon request, with a discount as it is. Dkolq H Tcewfdq Djqjl The machine is available immediately.

Condition: good (used), Functionality: fully functional, conveyor belt length: 5,000 mm, conveyor belt width: 1,500 mm, total length: 5,100 mm, total width: 1,600 mm, Length: 500 cm Width: 150 cm Dolq H Tewat Uhecqekl Height adjustable

Condition: new, neu ca. 4 Monate ab Auftragse Türkei 53900 € 1083.39 € Doppelsäulenführung 7000x41x1,3 mm 15 - 120 m/min 560 mm 540 mm 810 x 530 mm rund 520 mm, quadrat 520 rund 520 mm, quadrat 520 rund 330 mm, quadrat 330 875 mm 1.1 kW 4 kW 0.12 kW 3850 mm 1700 mm 2450 mm 3400 kg hydraulic vice digital readout for scale of bending angle hydraulic clamping of sawing arm turning of sawing arm by hand continuously variable down speed of sawing arm automatic sawing frame lifting after cutting sensitive cutting pressure adjustment subject to material condition hydromechanic tape tension readout by manometer mobile control panel Delqevvngxs H Tcqjkl angular geared conical heavy duty gear unit driven chip brush tape guiding by hard metal sheet plates and rolls automatic tape break lock coolant equipment HYDRAULIC UPLIFT OF SAWING FRAME user manual in GERMAN or ENGLISH (roller table see photo - optional available, additional price)

Condition: good (used), V-belt pulley, pulley with taper bush, taper clamping bush, taperlock clamping bush -V-belt pulley: 6-groove pulley .: 168V-belt width: 13 mm -Mounting: Ø 38 mm -Number: 2x pulley available -Price: per piece -Dimensions: Ø 105 x 95 mm Delqsv T Tluj H Tcqjkl -Weight: 3.6 kg/piece

Condition: used, mileage: 114,811 km, power: 115 kW (156.36 HP), gearing type: mechanical, fuel type: diesel, color: white, overall weight: 8,600 kg, number of seats: 3, first registration: 03/2019, next inspection (TÜV): 03/2026, emission class: euro6, Year of construction: 2019, loading space volume: 4 m³, loading space length: 3,800 mm, loading space width: 2,356 mm, loading space height: 400 mm, Equipment: ABS, air conditioning, crane, electronic stability program (ESP), soot filter, tail-lift, ATEGO 816 tipper 2-way with ZAA-AHK + ball head coupling * HIAB rear crane X-DUO 078 BS-2 * 5th + 6th circuit for grab control * Design 7.30 m + load capacity 860 kg * Vehicle no. for customer inquiries: 4209 * Crane * Engine version Euro VI, with OBD-C * Active Brake Assist * Air conditioning * Middle seat, with 3-point safety belt Djlqjvzdb Ao H Tcqskl * Manual gearshift * Lane keeping assistant * Environmental badge (green) * Trailer coupling G 135, for ZAA * Trailer coupling Ringfeder * Service booklet maintained * Stability control assistant (ESP) * Trailer brake, 2-line * Three-seater * Electronic braking system with ABS and ASR * Driver's suspension seat, comfort * Electric windows, both sides * Gearbox G 71-6/9.20-1.0 * NA MB 60-2c, MPA low, N-speed * Power take-off, single * Particle filter * Digital tachograph, EG, speed, ADR * Cruise control * AdBlue tank 25 l * Trailer socket 12 V, 13-pin, frame-mounted, LED * Trailer socket 24 V, 15-pin * Body type tipper/tipper semi-trailer * Roof hatch/roof ventilation flap * Weight variant 8.6 t (3.8/5.7) * Main mirror, electric, driver’s side * Heating, electronic compressed air supply unit * Rear spring, 5.7 t, parabola * Plastic tank 120 l, left * Meiller pump, 7-piston, type 270/45 * Engine OM934, R4, 5.1 l, 115 kW (156 HP), 650 Nm * Wheelbase 3620 mm * S-cab ClassicSpace, 2.30 m, tunnel * Front spring 4.0 t, parabola * Preparation for toll collection * Preparation, subsequent installation of loading crane * Maintenance documentation * Tail lift (only Commercial vehicles) No liability for printing and spelling errors Sold only to traders Subject to errors and prior sale* Changes, prior sale and errors are expressly reserved. The description serves to identify the vehicle and does not constitute a guarantee in the sense of sales law. The description in the purchase contract is decisive. * TOP SERVICE + QUALITY * We would be happy to make you a LEASING-FINANCE-RENT-PURCHASE offer Guarantee insurance available upon request from the insurer * TÜV / UVV LBW / speedometer inspection and installation of OBU device by our local partners * Customs license plate for 30 days All customs documents for export are possible, but must be requested individually * TOLL for Toll-Collect can be booked in-house * Free transfer from Stuttgart Airport or Metzingen (Württ) train station * TRAIN STATION FOR ARRIVAL/TRAIN STATION: 72555 METZINGEN/WÜRTT. * FOR ENGLISH * Andreas Pittas * Thomas Pittas * Alexander Pittas * Robin Pittas WHATSAPP number * * ---- Visit us on our website at * always over 150 vehicles in stock

Condition: used, total height: 1,700 mm, total length: 6,300 mm, total width: 2,000 mm, Empty weight: 8.000 kg Price: On request Metal turning lathe Model: Conventional Manufacturer: TOS Type: SU-100 Digital-readout: Sony Centerdistance: 3500mm Turningdiameter above bed: 800mm Spindle-hole: 80mm Motorpower: 16kW Spindle-speed: 6,7-1000rpm Dkolsvq U I Esq H Tcqsl Including 4-jaw-chuck + lynette Machine-dimensions: 6300x2000x1700mm + 800x800x1700mm Machine-weight: 8000kg Machine has been tested, in very good condition - Documentation available: No - Turning diameter: 800mm - Min. spindle speed: 7rpm - Center height: 400mm - Type digital: Sony - Center distance: 3500mm - Max. spindle speed: 1000rpm - Bore diameter: 80mm - Digital: Yes - Transport dimensions: 6300mm x 2000mm x 1700mm (l x w x h) - Transport weight [kg]: 8000kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, mileage: 114,811 km, power: 115 kW (156.36 HP), first registration: 03/2019, overall weight: 8,600 kg, fuel type: diesel, color: white, next inspection (TÜV): 03/2026, gearing type: mechanical, emission class: euro6, loading space volume: 4 m³, loading space width: 2,356 mm, loading space length: 3,800 mm, loading space height: 400 mm, Year of construction: 2019, number of seats: 3, Equipment: ABS, air conditioning, crane, electronic stability program (ESP), soot filter, tail-lift, ATEGO 816 tipper 2-way with ZAA-AHK + ball head coupling * HIAB rear crane X-DUO 078 BS-2 * 5th + 6th circuit for grab control * Design 7.30 m + load capacity 860 kg * Vehicle no. for customer inquiries: 4209 * Crane * Engine version Euro VI, with OBD-C * Active Brake Assist * Air conditioning * Middle seat, with 3-point safety belt * Manual gearshift * Lane keeping assistant * Environmental badge (green) * Trailer coupling G 135, for ZAA * Trailer coupling Ringfeder * Service booklet maintained * Stability control assistant (ESP) * Trailer brake, 2-line * Three-seater * Electronic braking system with ABS and ASR * Driver's suspension seat, comfort * Electric windows, both sides * Gearbox G 71-6/9.20-1.0 * NA MB 60-2c, MPA low, N-speed * Power take-off, single * Particle filter * Digital tachograph, EG, speed, ADR * Cruise control * AdBlue tank 25 l * Trailer socket 12 V, 13-pin, frame-mounted, LED * Trailer socket 24 V, 15-pin * Body type tipper/tipper semi-trailer * Roof hatch/roof ventilation flap * Weight variant 8.6 t (3.8/5.7) * Main mirror, electric, driver’s side * Heating, electronic compressed air supply unit * Rear spring, 5.7 t, parabola * Plastic tank 120 l, left * Meiller pump, 7-piston, type 270/45 * Engine OM934, R4, 5.1 l, 115 kW (156 HP), 650 Nm * Wheelbase 3620 mm * S-cab ClassicSpace, 2.30 m, tunnel * Front spring 4.0 t, parabola * Preparation for toll collection * Preparation, subsequent installation of loading crane * Maintenance documentation * Tail lift (only Commercial vehicles) No liability for printing and spelling errors Sold only to traders Subject to errors and prior sale* Changes, prior sale and errors are expressly reserved. The description serves to identify the vehicle and does not constitute a guarantee in the sense of sales law. The description in the purchase contract is decisive. * TOP SERVICE + QUALITY Dslq H Tjvzdb Njcqekl * We would be happy to make you a LEASING-FINANCE-RENT-PURCHASE offer Guarantee insurance available upon request from the insurer * TÜV / UVV LBW / speedometer inspection and installation of OBU device by our local partners * Customs license plate for 30 days All customs documents for export are possible, but must be requested individually * TOLL for Toll-Collect can be booked in-house * Free transfer from Stuttgart Airport or Metzingen (Württ) train station * TRAIN STATION FOR ARRIVAL/TRAIN STATION: 72555 METZINGEN/WÜRTT. * FOR ENGLISH * Andreas Pittas * Thomas Pittas * Alexander Pittas * Robin Pittas WHATSAPP number * * ---- Visit us on our website at * always over 150 vehicles in stock

Condition: used, total height: 1,700 mm, total length: 2,400 mm, total width: 1,500 mm, Empty weight: 1.000 kg - Documentation available: No - Turning diameter: 575mm - Min. spindle speed: 32rpm - Center height: 255mm - Center distance: 1000mm - Max. spindle speed: 2500rpm - Bore diameter: 42mm - Transport dimensions: 2400mm x 1500mm x 1700mm (l x w x h) - Transport weight [kg]: 1000kg Dkolq H Tev Stmcscqjl Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, - Documentation available: No Financial information Dkjlqjvnaxko H Tcqol VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, Year of construction: 1997, Price: On request - Year: 1997 - Documentation available: Yes Dkjlq H Tcev Stl Soqjl - CE mark available: Yes - Serial number: 270 - Control: CNC - Turning diameter: 420mm - Min. spindle speed: 4rpm - Center height: 210mm - Type digital: Weiler - Center distance: 900mm - Max. spindle speed: 3000rpm - Bore diameter: 55mm - Digital: Yes Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, total height: 1,750 mm, total length: 1,400 mm, total width: 800 mm, Empty weight: 500 kg - Documentation available: No - CE mark available: Yes - Turning diameter: 260mm - Min. spindle speed: 60rpm - Center height: 130mm - Center distance: 400mm - Max. spindle speed: 3000rpm - Bore diameter: 30mm - Transport dimensions: 1400mm x 800mm x 1750mm (l x w x h) - Transport weight [kg]: 500kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Dkslsv Stmpsq H Tcqol Bram van Summeren

Condition: used, Year of construction: 2019, operating hours: 10,789 h, lifting height: 8,900 mm, free lift: 3,100 mm, fuel type: electric, mast type: triplex, fork length: 1,200 mm, total height: 3,520 mm, total length: 1,750 mm, total width: 1,270 mm, color: other, Empty weight: 3.800 kg Lifting capacity: 1.400 kg Fork dimensions: 1.200 x 700 mm - Mast: Triplex - Lifting height: 8900mm - Lifting capacity: 1400kg - Maximum fork width: 700mm - Free lift: 3100mm - Attachment: Side-shift - Options: Free-lift, Joystick - Overhead clearance: 3520mm - Driving direction: 2 Road - Fork length: 1200mm - Year: 2019 - Documentation available: No - Serial number: 511902V01072 - Operating hours: 10789 - Battery voltage: 48V - Brand/Type: Still 4PzS620 - Capacity: 620Ah - Battery year of construction: 2019 - Drive: Elektric - Transport dimensions: 1750mm x 1270mm x 3520mm (l x w x h) - Transport weight [kg]: 3800kg - Transport packages [pcs.]: 1 Dkjlq H Tjv Tv Avscqsl Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Koen van Lent

Condition: used, total height: 1,500 mm, total length: 2,800 mm, total width: 1,350 mm, Empty weight: 1.500 kg - Documentation available: No - Serial number: 0413988 - Turning diameter: 400mm - Min. spindle speed: 22rpm - Center height: 200mm - Center distance: 1000mm - Max. spindle speed: 2000rpm - Bore diameter: 50mm Dolq H Tovw Rlyscqskl - Removable bed: Yes - Turning diameter removable bed: 600mm - Transport dimensions: 2800mm x 1350mm x 1500mm (l x w x h) - Transport weight [kg]: 1500kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, total height: 1,800 mm, total length: 2,700 mm, total width: 1,600 mm, Empty weight: 3.700 kg Price: On request Metal turning machine, lathe Model: CNC Manufacturer: Narvik / Pinnacle Type: CNC - PK L210A TC / L210A Controller: Siemens Year: 2008/09 Used for teaching in a school. In very good condition, very little and not intesive used. Max. turning diameter bed: 440mm Max. turning length: 610mm Dkelevtb Ukoq H Tcqsl Spindle-hole: 77mm X-Axis travel: 210mm Z-Axis travel: 610mm Spindle-speed: 4,5-4500rpm Motor-power: 11/15kW Toolholders/turret: 10 Werkzeugen Incl. toolholders en documents Machine-weight: 3700kg Machine-dimensions: 2700x1600x1800mm - Documentation available: Yes - CE mark available: Yes - Motor power: 15.0kW - Turning diameter: 440mm - Min. spindle speed: 5rpm - Type digital: CNC - Center distance: 610mm - Max. spindle speed: 4500rpm - Bore diameter: 77mm - Digital: Yes - Transport dimensions: 2700mm x 1600mm x 1800mm (l x w x h) - Transport weight [kg]: 3700kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, Year of construction: 1964, Price: On request Metal turning lathe Model: Conventional Manufacturer: Martin Type: DS 80 Incl. Sony Digital Readout Centerdistance: 3000mm Turningdiameter above bed: 800mm Turningdiameter in gapbed: 1120mm Spindle-hole: 95mm Dkslqsvq U Ife H Tcqol Max. workpiece-weight: 5000kg  Motorpower: 15kW Spindle-speed: 1120rpm Incl. 3-jaw-chuck: 620mm (Spindel: 250mm) Incl. 1x fixed Lynette (other two are not available) Machine-dimensions: 5500x1900x1700mm Machine-weight: 7350kg - Year: 1964 - Documentation available: No Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, Price: On request Metal turning machine, lathe Model: CNC Manufacturer: Narvik / Pinnacle Type: CNC - PK L210A TC / L210A Controller: FANUC Year: 2008/09 Used for teaching in a school. Dkslevq U Irsq H Tcqel In very good condition, very little and not intesive used. Max. turning diameter bed: 440mm Max. turning length: 610mm Spindle-hole: 77mm X-Axis travel: 210mm Z-Axis travel: 610mm Spindle-speed: 4,5-4500rpm Motor-power: 11/15kW Toolholders/turret: 10 Werkzeugen Incl. toolholders en documents Machine-weight: 3700kg Machine-dimensions: 2700x1600x1800mm - Documentation available: Yes - CE mark available: Yes Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, Year of construction: 1975, - Year: 1975 - Documentation available: No - Serial number: 80 - Motor power: 7.0kW - Turning diameter: 500mm - Min. spindle speed: 19rpm Dkelq Hsv Abpto Tcqsl - Center height: 250mm - Center distance: 1000mm - Max. spindle speed: 2000rpm - Bore diameter: 60mm Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, total height: 1,800 mm, total length: 2,800 mm, total width: 1,000 mm, Empty weight: 1.200 kg - Documentation available: No - Control: Conventional Dkslovz Uxrjq H Tcqel - Turning diameter: 435mm - Min. spindle speed: 32rpm - Center height: 217mm - Type digital: Newall - Center distance: 1000mm - Max. spindle speed: 1000rpm - Bore diameter: 50mm - Removable bed: No - Turning diameter removable bed: 620mm - Digital: Yes - Transport dimensions: 2800mm x 1000mm x 1800mm (l x w x h) - Transport weight [kg]: 1200kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, Year of construction: 2016, Price: On request CNC machining centre Felder Profit H350 16.50 Brand Felder Type Profit H350 16.50 Number of axles 5 Year of construction 2016 Machine number 302.09.016.16 Operating hours 5213 400 volt / 46 A  Air pressure 8 bar Machining table dimensions 5000x1550 mm (LxW) Operating table range X-4,010 mm Y-1,970 mm Z-455 mm Spindle speeds X-70 m/min Y-70 m/min Z-23 m/min Tool changer 18 positions Saw blade diameter 350 mm Vacuum pump capacity 90m3/h Connection diameter suction 300 mm Suction capacity 5100 m3/h Dkelq H Tcov Rd U Ueqjl Software Wood Flash Including 3D simulator  *Expect the vacuum pump bearings needs to be replaced  Weight machine 4100 KG - Year: 2016 - Documentation available: Yes - CE mark available: Yes - Serial number: 302.09.016.16 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Glenn Smeets

Condition: used, Year of construction: 2012, total height: 2,400 mm, total length: 13,500 mm, total width: 2,450 mm, Empty weight: 2.500 kg Price: On request Biesse Rover A1536 G FR Year 2012 Central lubrifaction FT work table, X 3765 Y 1560, 9 zones 12 kW electro spindle, ISO 30, air cooled Biesse WORKS Biesse NEST MODULE Dslqjv Rfg Ee H Tcqokl Air conditioner 16 pos. revolver magazine Work area XYZ 3765*1585*170 2x vacu pump 250 m³ C axis 360° BH 17 L drilling group Including loading and unloading system - Year: 2012 - Documentation available: Yes - CE mark available: Yes - Serial number: 81399 - Transport dimensions: 13500mm x 2450mm x 2400mm (l x w x h) - Transport weight [kg]: 2500kg - Transport packages [pcs.]: 4 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Glenn Smeets

Condition: used, Year of construction: 2008, total height: 1,800 mm, total length: 5,500 mm, total width: 1,700 mm, Empty weight: 4.600 kg Price: On request - Year: 2008 - Documentation available: Yes - CE mark available: Yes - Serial number: 37418 - Control: Conventional - Motor power: 11.0kW - Turning diameter: 630mm - Min. spindle speed: 16rpm - Center height: 315mm - Type digital: Newall - Center distance: 4000mm - Max. spindle speed: 1250rpm - Bore diameter: 103mm - Removable bed: Yes - Turning diameter removable bed: 800mm - Digital: Yes Delq H Tjvv E T Necqskl - Transport dimensions: 5500mm x 1700mm x 1800mm (l x w x h) - Transport weight [kg]: 4600kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren

Condition: used, total height: 1,500 mm, total length: 4,000 mm, total width: 1,400 mm, Empty weight: 2.200 kg - Documentation available: No - Motor power: 6.0kW - Turning diameter: 500mm - Min. spindle speed: 12rpm - Center height: 250mm - Center distance: 2000mm - Max. spindle speed: 1000rpm - Bore diameter: 58mm - Removable bed: Yes - Turning diameter removable bed: 760mm - Transport dimensions: 4000mm x 1400mm x 1500mm (l x w x h) - Transport weight [kg]: 2200kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT Dkjlq Hjv Stlre Tcqsl VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Bram van Summeren