Used Marwis Pickling Machine for sale (64,745)

Condition: like new (used), Year of construction: 2021, Hydraulic 4-roll bending machine Digital display of roll positions Capability to form cones Length: 3050 mm Diameter of upper rolls: 220 mm Diameter of side rolls: 180 mm Bending capacity: 7 to 8 mm with a minimum radius of 1000 mm Machine dimensions: 4700 x 1100 x 1330 mm Hnedpfxjz I D Ago Abkeu Weight: 5700 kg Operating videos available upon request.

Condition: used, all stainless steel belt width 400 mm mobile mesh width 5 mm adjustable speed with air knives with batter pump Hnodpfx Absz I N Rpeksu outside dimensions (l x w x h) : ± 1.900 x 900 x 1.900 mm with electric heating element: 3 kW - 230/400 V

Condition: used, total length: 2,000 mm, total width: 1,600 mm, total height: 2,350 mm, Colour: White Empty weight: 3.000 kg - Drive system: Conventional - Model: vertical - Number of axes [pcs]: 3 - Power [kW]: 5.5 - Max. stroke [mm]: 250 - Max. reach [mm]: 365 - Table diameter [mm]: 500 - Table length [mm]: 500 Hnodpfsz R Dr Uex Abksu - Table width [mm]: 500 - Table depth [mm]: 500 - X-axis travel [mm]: 560 - Y-axis travel [mm]: 450 - Z-axis travel [mm]: 250 - Min. stroke speed [rpm]: 22 - Max. stroke speed [rpm]: 112 - Transport dimensions: 2000mm x 1600mm x 2350mm (l x w x h) - Transport weight [kg]: 3000kg - 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 Lukas van Rossum

Condition: good (used), Year of construction: 2016, Manufacturer: Baader Model: 604-530 Year: 2016 Condition: Used Serial number: 120002207 Stock number: 3450 Drum: 10 mm Infeed height: 2400 mm Outfeed height: 900 mm Power: 3 x 400V, 50Hz, 9.3kW Dimensions: 1600 x 1650 x 2900 mm Hnodpfx Absz R Niaskeu Weight: 1700 kg Machine has only 1348 operating hours. Infeed hopper with mixing arm, touch screen control. Includes drum trolley, extra 10 mm drum, extra knife, and extra squeezing belt.

Condition: used, Year of construction: 1996, total height: 3,200 mm, total width: 3,200 mm, total length: 8,000 mm, Empty weight: 26.000 kg Price: On request Bed Milling machine Bed Miller Model: CNC Manufacturer: Anayak Type: FBZ-HV-4000 CNC: Heidenhain Year: 1996 Bed-dimensions: 4500x800mm X-travel: 4000mm Y-travel: 935mm Z-travel: 1000mm Hedpfxoz R N Ddo Abkonu Rotatable Fräsekopf Spindle-speed: 3000rpm Spindle-take: ISO 50 Incl. peripherals and documents Dismantled for transport Video available! Machine-dimensions: 8000x3200x3000mm Machine-weight: 26000kg - Year: 1996 - Documentation available: Yes - CE marking present: Yes - Serial number: 11676-FBZ - Drive system: CNC - Control system brand: Heidenhain - Number of axes [pcs]: 3 - X-axis travel [mm]: 4000 - Y-axis travel [mm]: 935 - Z-axis travel [mm]: 1000 - Table length [mm]: 4500 - Table width [mm]: 800 - Tool holder: ISO50 - Max. spindle speed [rpm]: 3000 - Transport dimensions: 8000mm x 3200mm x 3200mm (l x w x h) - Transport weight [kg]: 26000kg - 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 Lukas van Rossum

Condition: excellent (used), Year of construction: 2011, functionality: fully functional, OMN RV-500 Includes cooling system, dressing unit, and magnet. Hodpfsz R Rpnjx Abkenu

Condition: good (used), Year of construction: 2006, functionality: fully functional, travel distance X-axis: 1,050 mm, travel distance Y-axis: 510 mm, travel distance Z-axis: 560 mm, controller manufacturer: Mazatrol, controller model: 640M, total height: 2,700 mm, total length: 3,445 mm, total width: 3,301 mm, table width: 550 mm, table length: 1,300 mm, table load: 1,500 kg, rotational speed (min.): 25 rpm, rotational speed (max.): 6,000 rpm, overall weight: 8,900 kg, coolant supply: 15 bar, number of slots in tool magazine: 30, Equipment: chip conveyor, We are pleased to offer this very well-maintained Mazak MYV 515/40N vertical machining centre, manufactured in 2006. The machine is fitted with the Mazatrol 640M control system. This machine impresses with its stability and suitability for heavier machining operations. Technical specifications: Table dimensions: 1300 x 550 mm Table load capacity: 1,500 kg Hnedpfx Abjz Rmb Eekeu Number of pallets: 1 X-axis travel: 1,050 mm Y-axis travel: 510 mm Z-axis travel: 560 mm Spindle speed: 25 – 6,000 rpm Spindle mount: MAS BT 50 Spindle motor: 18.5/15 kW Positions in tool magazine: 30 We realise that you may wish to receive further information or view the machine. In that case, please contact us, providing your company details so that we can get in touch with you. About Mamach Machinehandel: With over 40 years experience in the CNC machinery sector, we are now one of Europe’s leading suppliers of metalworking machinery. Our success is based on high quality, customer-focused service and a strong international network. Discover our wide range of used CNC lathes and machining centres – we’d be happy to advise you personally!

Condition: good (used), Year of construction: 2004, functionality: fully functional, travel distance X-axis: 600 mm, travel distance Y-axis: 600 mm, travel distance Z-axis: 600 mm, controller manufacturer: Matsuura G-tech (Fanuc), controller model: 16i, workpiece height (max.): 750 mm, workpiece diameter (max.): 650 mm, workpiece weight (max.): 400 kg, total height: 2,635 mm, total length: 5,870 mm, total width: 3,440 mm, table width: 500 mm, table length: 500 mm, table load: 400 kg, overall weight: 13,700 kg, spindle speed (min.): 50 rpm, spindle speed (max.): 15,000 rpm, coolant supply: 25 bar, number of slots in tool magazine: 240, Equipment: chip conveyor, documentation/manual, We are pleased to offer this well-maintained Matsuura H-Plus 405 with pallet pool. This is a highly compact machine with extensive machining capabilities and 240 tool positions in the magazine. The machine was manufactured in 2004 and is equipped with the Matsuura G-Tech 16i (Fanuc 16i) control system. Technical specifications: Table dimensions: 500 x 500 mm Number of pallets: 6 Table load capacity: 400 kg X-axis travel: 600 mm Y-axis travel: 600 mm Hnodsz Rmk Topfx Abkju Z-axis travel: 600 mm Table indexing: 0.001° Spindle mount: Mas BT40 Big Plus Spindle speed: 50 – 15,0001 rpm Spindle motor: 22/18.5 kW Magazine capacity: 240 We realise that you may wish to receive further information or view the machine. In that case, please contact us, providing your company details so that we can get in touch with you. About Mamach Machinehandel: With over 40 years experience in the CNC machinery sector, we are now one of Europe’s leading suppliers of metalworking machinery. Our success is based on high quality, customer-focused service and a strong international network. Discover our wide range of used CNC lathes and machining centres – we’d be happy to advise you personally!

Condition: used, Year of construction: 2008, functionality: fully functional, Equipment: chip conveyor, documentation/manual, Wele Awea Machining Center Type AA1165 Hedsz N Tf Ijpfx Abkjnu Fanuc Series 18i-MB CNC Year 2008 Chip Conveyor ✅ Documentation ✅ Video Available ✅ Inspection Possible ✅

Condition: excellent (used), Year of construction: 2021, sheet width 1550 mm plate thickness 6.5 mm pre-bending 4.5 mm diameter of upper rolls 150 mm side roll diameter 130 mm diameter of lower rolls 150 mm distance max. OW zu UW 20.0 mm voltage 400 V total power requirement 1.1 + 2.2 kW weight of the machine ca. 2370 kg range L-W-H 3300 x 1150 x 1110 mm Rarely used, according to the previous owner Current new price approx. 25.000 euros Special price upon request (!) Features: - Electro-hydraulic 4-roll plate bending machine * ??Equipped with a driven top roll and bottom roll * Sturdy welded construction - Application range: * Light to heavy-duty sheet metal processing (steel/aluminum/stainless steel) - Electro-hydraulic adjustment of the bottom and side rolls - Linear guidance for the side rolls - Top roll driven by a robust electric motor and planetary gearbox - Mobile, separate control console - Hardened, crowned rolls (SAE 1050 / CK 45 steel) - Conical bending device - 3-axis digital display for precise roll positioning - Electro-hydraulic drop-end (swing-out bearing) - Operating manual (PDF) Hnodpfx Abjz St Rvokju

Condition: used, total length: 7,800 mm, total width: 1,700 mm, total height: 1,580 mm, Year of manufacture: 2005 Colour: Green Empty weight: 11.000 kg Price: On request - Year: 2005 - Documentation available: No - CE certificate present: No - Drive system: Conventional - Drive: Hydraulic - Number of rolls [pcs.]: 4 - Number of driven rolls [pcs]: 2 Hnjdpfx Ajzkkrvsbkeu - Max. sheet thickness [mm]: 12 - Max. prebending thickness [mm]: 10 - Max. working width [mm]: 2500 - Top roll diameter [mm]: 360 - Bottom roll diameter [mm]: 300 - Transport dimensions: 7800mm x 1700mm x 1580mm (l x w x h) - Transport weight [kg]: 11000kg - 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 Lukas van Rossum

Condition: used, Iron worker, punch press and section shear  Including Length-Stop Hersteller: Mubea / Muhr & Bender Type: Hydraulic Type: KBLH 1000 Capacity: 110 ton Shear plate: 200x26mm, 500x20mm Notching: 85x75x16mm Throat: 510mm Machine-weight: 4600kg Hnsdpewnhd Hsfx Abkou - Documentation available: No - CE certificate present: No - Drive: Hydraulic - Punching force [ton]: 110 - Punch throat depth [mm]: 510 - Options: Length stop 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 Lukas van Rossum

Condition: used, Year of construction: 2006, number of axes: 3, working width: 2,040 mm, working length: 3,680 mm, TECHNICAL DETAILS MACHINING PROCESS Machining process: Drilling and milling WORKING AREA X-axis working area: 3,680 mm Y-axis working area: 2,040 mm Number of working areas: 2 Number of controlled axes: 3 WORKTABLE Table type: Flat table / Nesting table Number of tables: 1 Table width: 3,680 mm Table length: 2,040 mm Table material: Aluminum DRILLING UNIT Number of drilling units: 1 Position of drilling unit: top Vertical drilling spindles: 7 Horizontal drilling spindles, X-axis: 2 Horizontal drilling spindles, Y-axis: 2 Total number of drilling spindles: 11 MILLING SPINDLE Number of milling spindles: 1 Position of milling spindle: top Controlled axes: 3 Motor power: 13 kW Speed: 24,000 rpm Automatic tool changer: yes TOOL MAGAZINE Number of tool magazines: 1 Tool slots: 12 Tool magazine: positioned at the head VACUUM SYSTEM Number of vacuum pumps: 1 Suction capacity: 250 m³/h CONTROL AND SOFTWARE Control: PC-based control Hedjz Enz Ujpfx Abkenu Programming software: Xylog Plus MACHINE DETAILS MAIN DRIVE Power of main electric spindle: 13 kW SAFETY CE marking: yes Protective guard: permanently mounted on the machine Safety system: front safety mats EQUIPMENT Aluminum nesting table Suction cups for workpiece clamping Vacuum pump Drilling unit with 11 drilling spindles Milling spindle with automatic tool changer Tool magazine with 12 tool slots PC-based control Programming software Xylog Plus Protective guard permanently mounted on the machine Front safety mats

Condition: good (used), Year of construction: 1970, center width: 2,350 mm, center height: 2,400 mm, Max. blank / workpiece over bed:2400 Centre height over bed: 1200mm Distance between centers: 2350mm Length of the gap: 400mm Maximum sheet thickness: 6mm Stroke X-Axis: 1200mm Stroke Y-Axis: 300mm Speedrange: 6 - 675Rpm Power: 40kW Stroke pinole quill: 1200mm Length: 4500mm Width: 3200mm Height: 2500mm Weight: 10200kg Please Note: The information on this page has been obtained to the best of our ability and belief, and from the manufacturers where possible. It is given in good faith, but its accuracy can not be guaranteed. Accordingly, it will not form a representation or constitute contractual terms. We advise you to check any vital details! Hnedpoxtaxwofx Abkeu

Condition: good (used), Year of construction: 1985, bore capacity in steel (diameter) 35.0 / 40.0 mm throat 315 mm bore stroke 180 mm turning speeds 130 - 3500 U/min table-size 615 x 470 mm column diameter 155 mm feed 0.1 / 0.2 / 0.3 mm/U spindle taper MT 4 MK engine output 2.0 / 2.4 kW weight 450 kg range L-W-H 800 x 650 x 2100 mm Hnedpfx Abez S N Drekeu Features: - Heavy-duty column drill press - With extended column (200 mm) - Drive: "VARIO" V-belt * Continuously variable speed control - automatic spindle feed (0.1/0.2/0.3 mm/rev) * with electromagnetic engagement - pole-changing motor - clockwise rotation of the drill spindle - adjustable fixed drill depth stop - Machine table with 2 T-slots * Height-adjustable via hand crank - Machined base plate - Coolant system in the machine base - Machine light - Emergency stop button on the front - Operating instructions (PDF)

Condition: good (used), Year of construction: 2001, bore capacity in steel (diameter) 40.0 mm bore capacity in cast iron 55.0 mm throat 335 mm bore stroke 200 mm bore spindles - Morse Taper MK 4 turning speeds 60 - 1.530 U/min table: 740 x 620 mm feed 0.15/0.2/0.3/0.36 mm/U Hsdpfxjz S N Dxj Abksnu total power requirement 2.6 / 3.1 kW weight of the machine ca. 850 kg range L-W-H 800 x 1150 x 2040 mm Machine comes from a vocational training workshop Good condition (!!) Features: - Heavy-duty/robust bench-mounted drill press - Drive: "VARIO" V-belt - Automatic spindle feed (0.15/0.2/0.3/0.36 mm/rev) - Stepless speed adjustment - 2 work tables with T-slots * Height-adjustable via hand crank - Adjustable drilling depth stop - Pole-changing motor - Machine light - Emergency stop button, front - Operatorâ??s manual

Condition: excellent (used), Sunnen GH210 Horizontal Hone Year 2010 Max Stroke 8000mm, Spindle Speed:0 - 300 rpm Maximum Spindle Power: 40 Hp (29.83 kW) Maximum Stroker Power: 18 Hp (13.42 kW) Stroke Speed Range: 0 – 100 ft/min (0 – 30.5 m/min) I.D. Range: 2 – 24 inches (50.8 – 609.6 mm) O.D. Range: 26 inches standard (660.4 mm) Hedpew U Uh Dofx Abkenu Maximum Part Weight: 8000 kg Approximate Machine Weight: 12,066 kg 400 VAC 50 Hz, 3-Phase (85 A) Siemens Simatic Control,

Year of construction: 2026, operating hours: 36 h, condition: used, functionality: fully functional, Product weight 2-500g, power220V/1P/50HZ, 0.6KW, Speed50-150pcs/min, machinesize: L1240*W535*H1130mm, SUS304,Weight 95kg The equipment can accurately divide the dough/pastry into evenly sized small dosages, which is suitable for the productionof variouspasta, and the divided dosage will be automatically beaten into the required shape, which has high production speed and high production efficiency. Hopper Material: 304 stainless steel 1. Food standard Hnsdpozx D Dbsfx Abksu 2. The hopper is suitable for many kinds of fillings like dry filling, scattered filling and other fillings with poor liquidity. It is more anti-corrosion and stable. Enjoy a long life. Cutter and safety cover Features: 1. Easy to take apart and control product length. 2. Does not stick dough. 3. All the material which can touch food we also use healthy materials. 4. Can make different shapes by changing nozzles. 5. High-quality nozzle material. Used, in good condition, still under 1-year warranty from the manufacturer. Selling due to the factory closure. More videos & photos on request.

Condition: used, Year of construction: 2021, machine/vehicle number: B740, functionality: fully functional, operating hours: 3,500 h, input voltage: 400 V, input frequency: 50 Hz, type of input current: three-phase, travel distance X-axis: 8,005 mm, travel distance Y-axis: 2,000 mm, travel distance Z-axis: 274 mm, workpiece length (max.): 8,005 mm, workpiece width (max.): 2,000 mm, workpiece height (max.): 274 mm, number of axes: 3, number of slots in tool magazine: 1, controller manufacturer: CMS, total height: 4,300 mm, total length: 10,500 mm, total width: 4,860 mm, overall weight: 2,200 kg, table length: 9,736 mm, table width: 2,080 mm, high-pressure hose length: 11 mm, water pressure: 4,130 bar, Equipment: CE marking, documentation/manual, We offer this used CMS Tecnocut Smartline machining center, year of construction 2021. Hjdpsz E Rmyjfx Abkenu Manufacturer: CMS Model: Tecnocut Smartline Year of manufacture: 2021 Condition: used Category ID: 2075 Type ID: 970 Type: machining center CMS Tecnocut Smartline CNC Waterjet Machine. See attached document for accurate dimensions. 8m x 2m steel honeycomb bed, up to 413MPa water pressure. Includes machine (with water tank), HMI & stand, reverse osmosis unit, pre-pressure intensifier (6 bar), CMS JetPower Evo Intensifier (4130 Bar), Clean water storage tank, Filter System for recycling water, Hydrogen Peroxide Dosing System, light guards, spare HP tube & orifice inserts. Manuals and machine drawings available upon request. Video showing machine running available on request. If you have any questions or need more information, feel free to send us a message or give us a call. As shown in the photographs, the catch tank shows wear from use, including localised corrosion and small rust-through areas on a few internal support beams; the machine remains operational and inspection is welcome.

Condition: used, Year of construction: 1996, functionality: fully functional, input voltage: 400 V, input frequency: 50 Hz, RILECART PB796 Calendar Binding Machine, Binding Size: 600 x 700 mm Fully automatic calendar punching and binding line. Automatic calendar hanger insertion. Max Punching Thickness per Stroke: 4,5 mm (depending on pitch, material and width), Standard Binding Dia: 1/4" & 5/16", Standard pitch 3:1", Variable speed: 500 to 2300 pieces/hour, depending on size, thickness and quality of materials. Complete with exit conveyor. Mechanical Condition: Very Good Power requirements: 400 V, 3-phase. External air supply required. Hodpfx Asz E S I Ssbksnu Delivery and installation service available. (POA)

Condition: used, machine/vehicle number: 008562, X axis working area: 2465 mm Y axis working area: 1260 mm Hnodjzvwilopfx Abkou Working Table: Flat table Main Electrospindle power: 13.2 KW Number of controlled axes: 3 axes Total number of drilling spindles: 10 Total number of tool changer positions: 16

Condition: good (used), Year of construction: 2017, functionality: fully functional, travel distance X-axis: 1,050 mm, travel distance Y-axis: 530 mm, travel distance Z-axis: 510 mm, controller manufacturer: Mazak, controller model: SmoothG, workpiece weight (max.): 1,200 kg, total height: 2,810 mm, total length: 3,650 mm, total width: 3,100 mm, table width: 550 mm, table length: 1,300 mm, overall weight: 6,800 kg, spindle speed (min.): 35 rpm, spindle speed (max.): 12,000 rpm, coolant supply: 15 bar, spindle motor power: 18 W, spindle nose: DIN 67871A, number of spindles: 1, number of slots in tool magazine: 30, Equipment: chip conveyor, documentation/manual, We are pleased to offer this very well-maintained Mazak VCN 530C vertical machining centre with a Lehmann 500 Series 4th/5th axis, manufactured in 2017. The machine is equipped with the user-friendly Mazatrol SmoothG control system. This machine impresses with its high precision, reliability and productivity, and is ideally suited for single-part and batch production. Technical specifications: Table dimensions: 1300 x 550 mm Table load capacity: 1200 kg Number of pallets: 1 NC rotary table: Lehmann T1-510520LL X-axis travel: 1050 mm Y-axis travel: 530 mm Z-axis travel: 510 mm Spindle speed: 35 – 12,000 rpm Hjdpfxez Nd Tco Abkenu Spindle mount: SK40/DIN 67871A Spindle motor: 18.5/11 kW Positions in tool magazine: 30 We realise that you may wish to receive further information or view the machine. In that case, please contact us, providing your company details so that we can get in touch with you. About Mamach Machinehandel: With over 40 years experience in the CNC machinery sector, we are now one of Europe’s leading suppliers of metalworking machinery. Our success is based on high quality, customer-focused service and a strong international network. Discover our wide range of used CNC lathes and machining centres – we’d be happy to advise you personally!

Condition: used, Year of construction: 2013, operating hours: 13,672 h, total height: 2,450 mm, total length: 5,000 mm, total width: 2,200 mm, Empty weight: 9.000 kg - Year: 2013 - Documentation available: Yes - CE marking present: Yes - Serial number: 1237361A51A - Operating hours: 13672 - Drive system: CNC - Horizontal/vertical: vertical - Control system brand: Fanuc - Control system type: 0-MD - Power [kW]: 11.0 - Number of axes [pcs]: 3 - X-axis travel [mm]: 610 - Y-axis travel [mm]: 430 - Z-axis travel [mm]: 570 - Table length [mm]: 650 - Table width [mm]: 450 - Tool holder: BT40 - Main spindle power [kW]: 15 - Max. spindle speed [rpm]: 10000 - Options: Tool magazine, Chip conveyor, Spindle cooling, Pallet milling machine, Exchange table, External cooling - └ Tool magazine [pcs.]: 24 - Transport dimensions: 5000mm x 2200mm x 2450mm (l x w x h) Hnodeyzzrkopfx Abkju - Transport weight [kg]: 9000kg - Transport packages [pcs.]: 2 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 Lukas van Rossum

Condition: used, Year of construction: 1996, total height: 2,570 mm, total length: 3,520 mm, total width: 2,350 mm, Empty weight: 6.000 kg - Year: 1996 - Documentation available: Yes - CE marking present: Yes - Serial number: M2058 - Drive system: CNC - Horizontal/vertical: Horizontal - Control system brand: Fanuc - Control system type: 18-M - Number of axes [pcs]: 3 - X-axis travel [mm]: 750 - Y-axis travel [mm]: 420 - Z-axis travel [mm]: 450 - Table length [mm]: 900 - Table width [mm]: 420 - Min. spindle speed [rpm]: 40 - Max. spindle speed [rpm]: 8000 - Transport dimensions: 3520mm x 2350mm x 2575mm (l x w x h) - Transport weight [kg]: 6000kg Hnsdpfxow Slaxj Abkju 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 Lukas van Rossum

Condition: used, Year of construction: 1956, total width: 900 mm, total length: 2,050 mm, total height: 2,100 mm, Colour: Green Empty weight: 2.400 kg - Year: 1956 - Serial number: 3706 - Drive system: Conventional - Drive system: Gear drive - Number of drills [pcs]: 4 - Power [kW]: 6 - Table type: Fixed table - Table length [mm]: 1800 - Table width [mm]: 350 - Drilling depth [mm]: 160 - Drilling capacity [mm]: 25 - Reach [mm]: 275 - Main spindle power [kW]: 6.0 - Min. spindle speed [rpm]: 180 - Max. spindle speed [rpm]: 2000 - Options: Tapping function - Transport dimensions: 2050mm x 900mm x 2100mm (l x w x h) - Transport weight [kg]: 2400kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT Hnjdpfx Absz R Dt Eokou VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum