Used Boehringer Vdf 250 C for sale (86)

Condition: excellent (used), functionality: fully functional, Maximum working range: 2 m Gijdpfey Artzox Acwer Maximum turning diameter over bed with cover: 420 mm Please have a look at the pictures.

Condition: excellent (used), Year of construction: 1997, functionality: fully functional, machine/vehicle number: 1114.3705-24, Used CNC Lathe Make: Boehringer Type: VDF 250Cm Year of Manufacture: 1997 VDF Boehringer 250C The machine has the following features: 1000mm turning length No tailstock Driven tools Special indexing chuck Siemens 840C control system Godpfxowlap Ae Acwoir The Boehringer VDF 250Cm is a CNC lathe designed for machining chucked parts. It is characterized by its robust construction and precise machining capabilities. Technical Specifications (Model Year 1997) Working Area: Swing over Bed: 550 mm Swing over Cross Slide: 480 mm X-Axis Travel: 405 mm Z-Axis Travel: 1,099 mm Maximum Turning Length: 1,000 mm (None) Tailstock: Tool Turret: Number of Positions: 12 Tool Holder: VDI 50 DIN 69880 Live Tools: YES Spindle: Spindle Head Size: 8 DIN 55026 Spindle Bore: 103 mm Max. Chuck Diameter: 315 mm Max. Drive Power (50% Duty Cycle): 53 kW Max. Torque: 780 Nm Speed Range: 30–3,000 rpm Feeds: Automatic Feeds: 1–10,000 mm/min Rapid traverse speed: 10 m/min (X and Z axes) Max. feed force: 15 kN Dimensions and weight: Machine dimensions (L × W × H): approx. 5,400 × 3,200 × 2,400 mm Machine weight: approx. 11,000 kg Equipment: Pivoting control panel Hydraulic system from HYDROKRAFT Coolant system with 600 l tank, max. pump pressure 5.5 bar, flow rate 60 l/min, pump power 1.1 kW Chip conveyor with 325 l tank capacity, right-hand discharge 3-jaw power chuck Oil mist extraction Control cabinet with cooling unit and temperature controller from RITTAL Control system: SIEMENS SINUMERIK 840 C Variants and Differences There are various variants of the VDF 250 series, such as the VDF 250 CU, which can be equipped with different control systems (e.g., PHILIPS B2T) and technical specifications. Some models feature driven tools and a tailstock, while others are designed as pure chuck-type lathes without a tailstock. Conclusion The Boehringer VDF 250 Cm is a versatile CNC lathe characterized by its stability and precision. With its robust construction and extensive features, it is ideally suited for machining chucked parts in a variety of production environments.

Condition: used, Year of construction: 2000, greates pass round over bed 520 mm swing diameter over bed slide 480 mm turning length 3000 mm control 840 D SIEMENS number of tools 12 Driven tools - quantity 6 spindle bore 103 mm c-axis ja 0 Scope of delivery of the basic machine: SINUMERIK 840 D 3 controlled axes Rotation Ø over bed 520 mm Turning Ø over bed slide 480 mm Tool carrier with 12 cylindrical shank holders Ø 50 mm 1-stage AC main drive, 53 kW, 50 % ED Speed range 30 - 3000 min-¹ Main spindle head size 8 Clamping door for clamping devices chip conveyor THREE-DIMENSION 3000 mm 12 cylindrical shank holders DIN 69880-50x78 Giedpfx Aswp S Sqocwor of which 6 positions can be equipped with driven tools, Power 6 kW at 60 % ED, speed range 20-2500 min-¹ 2 gear stages C-AXLE Speed range 0-20 min-¹ Max. Angle specification 9999.999° Working range according to work area diagram POWER CHUCK 3 NHF 315-82 A8 FABR. FORKARDT with centrifugal force compensation, Outer Ø 315 mm, bore Ø 82 mm, with hard top jaws, ground, rod material Ø max. 63 mm including draw tube and attachment

Condition: ready for operation (used), Year of construction: 2000, functionality: fully functional, turning length: 1,000 mm, spindle speed (max.): 3,000 rpm, turning diameter over bed slide: 480 mm, controller model: Siemens Sinumerik 840C, TECHNICAL DETAILS Turning length: 1,000 mm Swing diameter over bed: 550 mm Swing diameter over cross slide: 480 mm Turret: 12 positions Number of driven stations: 6 Tool holder: VDI50 Speed range: 30 - 3,000 rpm Spindle bore: 90 mm MACHINE DETAILS Giedpfx Acoxtmvcowsr Control: Siemens Sinumerik 840C Dimensions & weight Dimensions (LxWxH): 580 x 270 x 270 cm Weight: approx. 11 t EQUIPMENT SMW Autoblok 315 power chuck (without soft top jaws) Approx. 10 driven tools Approx. 10 live centers for tailstock

Year of construction: 1992, condition: ready for operation (used), Turning diameter over bed/face slide: 420mm/280mm, turning length: 1000mm, spindle bore: 78mm, max. speed: 3550rpm, drive power: 35kW, tool positions: 12 (with driven tools), tool holder: VDI50, rapid traverse: 10m/min. Machine dimensions X/Y/Z: approx. 4100mm/2300mm/2200mm, weight: approx. 10000kg, control: Siemens 840T with C-axis. After a buffer battery replacement, the software of the machine was deleted, whereby some machine parameters were deleted without documentation and automatic operation is currently impossible. Expected to be available from Q1, 2025. Godpfx Acju D H Hwewjir

Condition: good (used), Year of construction: 1993, functionality: fully functional, machine/vehicle number: 1117-7177-26, turning diameter over cross slide: 450 mm, turning length: 1,000 mm, turning diameter: 550 mm, spindle bore: 78 mm, spindle speed (max.): 2,500 rpm, travel distance X-axis: 435 mm, travel distance Z-axis: 1,176 mm, spindle motor power: 43 W, rapid traverse Z-axis: 10 m/min, rotational speed (min.): 16 rpm, rotational speed (max.): 2,500 rpm, total height: 2,390 mm, total length: 5,360 mm, total width: 2,635 mm, quill diameter: 100 mm, quill stroke: 100 mm, swing diameter over cross slide: 450 mm, feed rate Z-axis: 10 m/min, turning diameter over bed slide: 450 mm, workpiece weight (max.): 1,500 kg, torque: 2,240 Nm, overall weight: 11,000 kg, chuck outer diameter: 400 mm, mount diameter: 400 mm, Equipment: documentation/manual, rotational speed infinitely variable, CNC Lathe Boehringer VDF 315 C with Fanuc Control We are selling a used CNC lathe from Boehringer VDF, type 315 C, equipped with a Fanuc 15-TF control unit. The machine is from 1993 and is in very good condition, as it has only been operated in single-shift mode and was never used for large series production. A special feature of this machine is the Fanuc control with a graphical user interface, which offers significant programming advantages compared to the (no longer supported) Philips control system. The machine is equipped with a chip conveyor and a coolant system. It is fully functional and free of any defects. All manuals for the machine and the control unit, including all necessary technical information, are available. The lathe is offered with a comprehensive accessories package (at additional cost) and can be collected in Eschweiler. Gedpfxjymmpks Acwjir

Condition: ready for operation (used), Year of construction: 1997, functionality: fully functional, turning diameter over cross slide: 480 mm, spindle bore: 103 mm, turning length: 2,000 mm, turning diameter: 520 mm, turning diameter over bed slide: 520 mm, three-jaw chuck diameter: 400 mm, spindle diameter: 110 mm, workpiece length between centers: 2,000 mm, CNC: Siemens Sinumerik 840 D Swing over bed: 520 mm Permissible swing over carriage: 480 mm 12-position turret Speed range: 7-2800 rpm Distance spindle nose to faceplate: 2171 mm Maximum turning diameter: 520 mm Maximum turning length: 2000 mm X axis: 405 mm Z axis: 2049 mm Spindle speed: 7-3000 rpm Spindle bore: 103 mm Gjdpfx Aceyxv D Newjir Spindle nose: A11 No tailstock.

Condition: used, Year of construction: 2002, turning diameter max. 480 mm turning length max. 2.000 mm control Sinumerik 840 D Siemens swing diameter max. over bed cover 520 mm turning speed range - main spindle 7 - 2.800 min/-1 transmission ratio 2 power capacity - main spindel 53 kW max. Torque 3.456 Nm spindle nose 11 DIN 55026 chuck diameter 315 mm spindle bore 103 mm usable bar diameter 82 mm x-travel 405 mm z-travel 2.049 mm diameter of quill 100 mm quill stroke 100 mm tension force 14 kN capture 30 DIN 2079 rapid traverse 10 m/min Working speed 0,1 - 10.000 mm/min feed power 15 kN number of toolpositions 12 pos. driven statition 6 pos. Shank diameter 50 mm power capacity 5,4 kW Max. Speed 2.500 / 625 min/-1 max. Torque 25 / 100 Nm total power requirement ca. 50 kW Gisdpfx Acjvy Ig Tewjr weight of the machine ca. 14 t dimensions of the machine ca. 6,4 x 3,8 x 3,0 m CNC-Lathe VDF BOEHRINGER - VDF 315 Cm / DL 2000 - incl. 2x Workbench

Condition: used, Year of construction: 1995, turning diameter 560 mm turning length 1250 mm control Sinumerik 805 turning dia. over face-slide 340 mm spindle bore 63 mm spindle turning speed range 3 - 2500 U/min feeds - longitudinal 0,001 - 3 mm/U feeds - cross 0,001 - 3 mm/U rapid traverse longitudinal 7 m/min rapid traverse cross 3,5 m/min thread - mm pitch 0,5 - 140 mm thread - inch 1/4 - 56 Gang/ inch. thread - module mm main drive 19 kW clamping length max. 2250 mm total power requirement 24 kW weight of the machine ca. 4,8 t dimensions of the machine ca. 4,0 x 1,65 x 1,75 m Gijdpfx Acoymp Sujwer controll Siemens 805, for cone turning, contour turning and threat cutting. Machine has MULTIFIX toolholder system size "C", steady and 3 jaw chuck.

Year of construction: 1993, condition: good (used), CNC lathe cycles Fabr.VDF BOEHRINGER type: DUC 560 BJ. 1993 with SIEMENS SINUMERIK 805T control. Gedpod Ewaaofx Acweir Turning length: 1000 mm Turning diameter over plan support: 365 mm Turning diameter above bed: 570 mm Spindle speeds: 3-2500U/min spindle motor: 19KW Spindle bore: 62 mm Chuck diameter: 315 mm Forkardt Turret head with 8 POS. VDI 30 With accessories and equipment documentation.

Year of construction: 1996, condition: ready for operation (used), We have spare parts for CNC lathe VDF Boehringer cm180. Following parts. Turret head price:1500,-€ Gsdpjgqurbsfx Acwjir Tailstock price:1000,-€ Main headstock price:3000,-€ ball screw X and Z axis price:1000,-€ axis motors X and Z price:3000,-€ Main spindle motor price:3250,-€ Hydraulic system price:1200,-€ Chuck 250mm with clamping system Price:1800,-€

Condition: used, Year of construction: 1999, Lathe with 4 tools only for 3-cylinder crank shaft Giedpfsw Dufiox Acwer *

Condition: used, Year of construction: 1996, turning diameter 250 mm weight of the machine ca. 8 t PHILIPS CNC control X-axis: 295 mm / Y-axis: 295 mm Center distance: 1000 mm Max. diameter on the bed: Ø 310 mm Max. diameter when turning: Ø 250 mm. Maximum turning speed: 4500 rpm. Spindle bore diameter: Ø 78 mm Turret with 8 tools Weight: approx. 8 tons Godpfx Acjyan R Aowoir

Condition: ready for operation (used), Year of construction: 2001, functionality: fully functional, machine/vehicle number: 2022.3781-03, turning diameter over cross slide: 365 mm, turning length: 4,000 mm, spindle speed (max.): 2,500 rpm, controller model: Siemens Sinumerik 810 D, TECHNICAL DETAILS Turning length: 4000 mm Swing over bed: 570 mm Swing over cross slide: 365 mm Cross slide travel: 345 mm Center height over flat track: 280 mm Bed width: 360 mm Bed slide guide length: 520 mm Cross slide width: 225 mm Cross slide length: 680 mm Turning tool cross-section: max. 20 x 20 mm Faceplate diameter: 560 mm Chuck diameter: 250 - 315 mm according to VDF 6025 Control: SINUMERIK 810 D with screen Workpiece weight with tailstock: max. 1000 kg Gijdpfxov R Hams Acwer Workpiece weight with tailstock and 2 steady rests: max. 1600 kg Main spindle Spindle head according to DIN 55 027: Size 8 Spindle diameter in the front bearing: 100 mm Spindle bore: 62 mm Main spindle inner taper: 70 mm Main Drive Motor type: Continuously variable three-phase AC motor Drive power (60% / 100% duty cycle): 25/20 kW Maximum torque (60% / 100% duty cycle): 1,800/1,400 Nm Total speed range: 3 - 2,500 rpm (2-stage) Constant cutting speed: 1 - 9,999 m/min Feed drives Drive type: Three-phase servo drives (AC motor) Transverse and longitudinal feed range: 0.01-50 mm/rev Max. feed rate (rapid traverse): 5 m/min Conventional rapid traverse, transverse: 2.5 m/min Max. longitudinal feed rate (rapid traverse): 10 m/min Conventional rapid traverse, longitudinal: 5 m/min Transverse feed force: 7,100 N Longitudinal feed force: 12,500 N Tailstock Quill diameter: 80 mm Quill stroke: 190 mm Quill inner taper: MT 5 Tip angle, standard: 60° Thread pitch: 0.1 - 2,000 mm MACHINE DETAILS Floor space required: 6.83 x 2.16 m Machine height: 1.98 m Weight: 7,200 kg Total power consumption: 35 kVA EQUIPMENT - Sauter 8-station disc turret - Fixed steady rest - 8 cylindrical shank adapters - Coolant pump - Lubrication pump - Machine stand - Transport base - Main spindle brake - Operating instructions and circuit diagrams

Condition: ready for operation (used), Year of construction: 1999, functionality: fully functional, machine/vehicle number: 1325.0458-14, controller manufacturer: Siemens, input frequency: 50 Hz, input current: 190 A, TECHNICAL DETAILS Electrical Operating voltage: 400 V Phases: 3 AC Frequency: 50 Hz Fusing: 250 A Rated current: 190 A EQUIPMENT Lathe with 4 tools, suitable only for 3-cylinder crankshaft Gisdowx Hktepfx Acwjr

Condition: excellent (used), Year of construction: 2001, functionality: fully functional, turning length: 1,000 mm, turning diameter: 480 mm, • Turret overhauled in 2021 • Coolant pump upgraded to higher pressure/flow rate in 2021 • Draw tube replaced and spindle head newly mounted and ground in 2022 • Prepared for automatic loading of parts via robot cell Control: CNC control including Siemens 840 D color screen Gijdpjwwkx Ejfx Acwer TECHNICAL DATA Maximum swing diameter: 550 mm Maximum turning diameter: 480 mm Turning length: 1000 mm Spindle bore: 78 mm Drive power (50%): 53 kW Speed range (single stage): 30 – 4000 rpm Drum turret Number of stations: 12, of which powered: 6 Tool shank diameter: 40 mm Speed range (two-stage): 20 – 2500 rpm Tailstock (hydraulic quill adjustment) EQUIPMENT / ACCESSORIES  Full enclosure including work area lighting  Automatic power-operated sliding door  C-axis  Tailstock programmable drag function including various center points  12-position drum turret  Turret drive unit  Chip conveyor  Coolant system with reinforced pump, approx. 4 bar  Interface for automation  Various accessories  1 pc. Heimbuch collet chuck SK 80, without collets  1 pc. Schunk Rota NCF 315 three-jaw chuck  1 pc. Schunk Rota NCF 250 three-jaw chuck  1 pc. Schunk Rota NCF 250 two-jaw chuck  1 pc. WTO broaching head  2 pcs. driven tools CAPTO axial tool  2 pcs. driven tools CAPTO axial radial tool  3 pcs. driven tools CAPTO radial tool  7 pcs. static tool holders  Installation elements  Documentation

Condition: excellent (used), Year of construction: 2001, functionality: fully functional, turning length: 1,000 mm, turning diameter: 480 mm, • Turret overhauled in 2021 • Coolant pump with increased pressure/delivery rate in 2021 • Draw tube replaced and headstock newly mounted and ground in 2022 • Prepared for automatic part loading via robot cell Control: CNC control including color display Siemens 840 D TECHNICAL DATA Max. swing diameter: 550 mm Max. turning diameter: 480 mm Turning length: 1000 mm Spindle bore: 78 mm Drive power (50%): 53 kW Speed range (single-stage): 30 – 4000 rpm Drum turret Number of stations: 12, of which 6 are driven Tool shank socket: 40 mm Speed range (two-stage): 20 – 2500 rpm Tailstock (hydraulic quill adjustment) EQUIPMENT/ACCESSORIES - Full enclosure including work area lighting - Automatically operated sliding door - C-axis - Tailstock programmable drag, incl. various centers - 12-position drum turret - Turret drive units - Chip conveyor - Coolant system with reinforced pump, approx. 4 bar - Automation interface - Various accessories - 1 piece Heimbuch Spanntop SK 80, without collets - 1 piece Schunk Rota NCF 315 three-jaw chuck - 1 piece Schunk Rota NCF 250 three-jaw chuck - 1 piece Schunk Rota NCF 250 two-jaw chuck Gjdsvr Tkzopfx Acwoir - 1 piece WTO broaching unit - 2 pieces driven tools CAPTO-axial tool - 2 pieces driven tools CAPTO-axial radial tool - 3 pieces driven tools CAPTO-radial tool - 7 pieces fixed tool holders - Mounting elements - Documentation

Condition: ready for operation (used), Year of construction: 2001, functionality: fully functional, turning length: 1,000 mm, turning diameter: 480 mm, spindle bore: 78 mm, rotational speed (max.): 4,000 rpm, Meticulously maintained lathe: Turret overhauled in 2021 and coolant pump with higher pressure installed in 2021! Draw tube replaced and spindle head re-bushed and ground in 2022! Automatic loading of parts via robot cell possible (robot cell not included)! TECHNICAL DETAILS Max. swing diameter: 550 mm Spindle nose: 40 mm Drive power (50%): 53 kW Speed range (1-step): 30 – 4,000 rpm Speed range (2-step): 20 – 2,500 rpm Turret Drum turret: 12-position Number of tool mounts: 12, of which powered: 6 Tailstock Gedowx Ipqepfx Acweir Tailstock: hydraulic with quill adjustment Control CNC control with Siemens 840 D color display EQUIPMENT Fully enclosed machine housing with work area lighting Automatic power-operated sliding door C-axis Program-controlled tailstock with various live centers 12-position drum turret Driven turret tooling Prepared for automatic parts loading with robot cell Overhauled turret (2021) Coolant pump with increased capacity (2021) Draw tube and spindle head re-bushed and ground (2022)

Condition: ready for operation (used), Year of construction: 1999, functionality: fully functional, turning length: 3,000 mm, turning diameter: 480 mm, spindle speed (max.): 3,550 rpm, quill travel distance: 100 mm, turning diameter over bed slide: 520 mm, TECHNICAL DETAILS Turning length: 3,000 mm Recommended chuck outer diameter: 250–315 mm Swing diameter over bed: 520 mm Max. turning diameter over cross slide: 480 mm Plan travel: 435 / 405 mm Cross slide travel: 3,176 mm Tool holder shank height: 25 mm Boring bar holder, shank diameter: 50 mm Spindle nose with centering cone (DIN 55026): Size 8 Spindle bore: 78 mm Spindle diameter at front bearing: 120 mm Drive power (max.): 53 kW Max. torque: 630 Nm Speed range: 37–3,550 rpm Speed control: stepless Max. feed rate: 10,000 mm/min Rapid traverse speed: 10 m/min Max. feed force / drilling force: 15 kN Tailstock quill outer diameter: 100 mm Tailstock quill stroke: 100 mm Max. quill force: 14 kN MACHINE DETAILS Drive power: 53 kW at 50% duty cycle Approx. machine weight: 15,600 kg Bed design: VDF slant bed EQUIPMENT - Composite bed structure made of Meehanite cast iron bed and reinforced concrete subframe - High rigidity and damping - 3-point, foundation-free installation Giodpfx Acjww E I Iewsr - Unobstructed chip fall due to 20-degree slant of guideway cover - Wedge-shaped cross slide for heavy-duty machining - Automatic lubrication system with reservoir

Condition: excellent (used), turning diameter over bed 900 mm turning diameter over slide rest 600 mm turning length 3000 mm spindle turning speed range 11,2 - 560 U/min tool holder Multifix D1 total power requirement 22 kW weight of the machine ca. 5,6 t dimensions of the machine ca. 5,6 x 1,8 x 1,7 m Safety-related conversion according to CE standard 2017 2011 new plan pull spindle, lock case partially renewed, lubrication according Gisdpfeym D H Tsx Acwer to internal plan

Condition: used, Year of construction: 2000, centre height 280 mm centre distance 1200 mm turning diameter over bed 570 mm turning diameter over slide 365 mm turning length 1000 mm spindle taper DIN 55027 Gr. 8 control Sinumerik 810 D SIEMENS bed width 360 mm spindle bore 62 mm turning speed range 3 - 2500 U/min feed: 5000 mm / min rapid travel - longitudinal/face 10 m/min 3-jaw-chuck diameter 250 mm quick change toolholder SANDVIK Coromant Capto drive capacity - spindle motor 25 kW taper in tailstock-quill MK 5 dia. of quill 100 mm quill stroke 190 mm Gisdox E Dn Ajpfx Acwer voltage 400 V weight of the machine ca. 5,0 t dimensions of the machine ca. 3,55 x 2,20 x 1,95 m - Serial No.: 2022-3742-03 - CNC-Control SIEMENS Sinumerik 810 D - Rapid feed - Coolant equipment - Machine lamp

Condition: ready for operation (used), Year of construction: 2000, functionality: fully functional, turning diameter over cross slide: 365 mm, spindle bore: 62 mm, turning length: 2,000 mm, turning diameter: 57 mm, swing diameter over cross slide: 365 mm, rapid traverse X-axis: 5 m/min, rapid traverse Z-axis: 10 m/min, spindle speed (min.): 3 rpm, spindle speed (max.): 2,500 rpm, bed width: 360 mm, total length: 5,000 mm, total width: 2,100 mm, total height: 2,000 mm, workpiece weight (max.): 1,600 kg, travel distance cross slide: 345 mm, overall weight: 5,000 kg, rotational speed (min.): 3 rpm, rotational speed (max.): 2,500 rpm, The VDF Boehringer DUS 560 Ti is, in terms of turning diameter, the most popular teach-in lathe from VDF Boehringer. With a standard chuck size of 315mm or larger, these machines offer optimal machining efficiency for single-piece and small batch production. This machine is currently set up in our showroom and can be viewed on site! Comes as standard with: - Original documentation Gjdpfx Acsyvuhzjwjir - Set of tool holders + drill chuck - Fixed steady rest - 3-jaw Forkardt 315-F Ø315mm chuck Weight & dimensions: - 5,500 kg - 5,000 x 2,100 x 2,000 mm (LxWxH) For all specifications of this machine, please see the last images!

Condition: used, Year of construction: 1971, machine/vehicle number: 1047 0885, height of centers: 330 mm center distance: 1500 mm Gjdpsbbk Exjfx Acweir max. circulation-Ø over bed: ueber Bett 690 mm spindle boring: 82 mm spindle retainer: Kurzkegel Gr. 8 retainer taper tailstock: 6 MK spindle speed: 7,1 - 1400 rpm forwarding feed: laengs/plan 0,05-112/0,025-56 mm/U thread pitch: 0,25 - 560 mm electrical connection: 380 V, 15 kW space needed: 3350 x 1800 x 1400 mm weight: 4800 kg

Condition: used, Year of construction: 1982, Center height: 400 mm Center width: 1250/1300 mm Swing diameter: over bed 440 mm Spindle bore: Spindle mount: Tailstock taper: 5 MK Spindle speeds: 11.2 - 2240 rpm Feeds: longitudinal/transverse 0.1-2.8/0.05-1.4 mm/rev Thread pitches: Electrical connection: 380 V, 11 kW Space required: 3400 x 1400 x 1300/1700 mm Weight: approx. 2700 kg Gjdpfx Acjvzn Itsweir

Condition: used, Year of construction: 2000, control Siemens Sinumerik 805 turning length 1350 mm Turning diameter above the facing slide 570 - 365 mm spindle passage 60 mm --> Technical Specifications Precision universal lathe with programmable cycles --> Siemens Sinumerik 805 control system Gjdpfx Aceyu U Aueweir --> Turning length 1350 mm --> Swivel diameter of bed cross slide 570–365 mm --> Cross slide travel 345 mm --> Tool cross-section DIN 770h x b 32 x 25 mm --> Spindle bore 60 mm