Used Tschudin Htg 610I Internal And Surface Grinding Machine for sale (75,092)

Condition: used, Year of construction: 1987, functionality: fully functional, machine/vehicle number: 3520.17.137, Tripet TST201CNC No. 3520.17.137, Year of Manufacture: 1987 Bljdpfxjwffmms Afkek Power: 76 kW

Condition: ready for operation (used), Year of construction: 2004, operating hours: 2,184 h, functionality: fully functional, machine/vehicle number: 2407-463, spindle speed (max.): 60,000 rpm, number of spindles: 3, swivel angle B-axis (min.): -90 °, swivel angle B-axis (max.): 15 °, TECHNICAL DETAILS Grinding spindle speeds Spindle 1: 60,000 rpm Spindle 2: 60,000 rpm Bodpfsxtdfbex Afkslk Spindle 3: 45,000 rpm B-axis swivel range: -90°/+15° MACHINE DETAILS Spindle hours Spindle 1: 11,278 h Spindle 2: 2,184 h Spindle 3: 2,841 h Main counter: 45,144 h EQUIPMENT Touch probe (on 4th spindle position)

Condition: ready for operation (used), Year of construction: 1983, functionality: fully functional, machine/vehicle number: 8151, rotary table diameter: 800 mm, grinding height: 750 mm, workpiece weight (max.): 800 kg, total height: 4,100 mm, total width: 26,650 mm, total length: 44,000 mm, feed length Y-axis: 750 mm, feed length Z-axis: 550 mm, overall weight: 13,000 kg, grinding wheel diameter: 400 mm, disc diameter: 400 mm, grinding spindle speed: 1,460 rpm, grinding diameter: 800 mm, control cabinet width: 650 mm, type of input current: DC, control cabinet height: 1,900 mm, control cabinet length: 1,800 mm, spindle speed (max.): 1,800 rpm, spindle speed (min.): 1,460 rpm, table load: 900 kg, workpiece diameter (max.): 850 mm, grinding wheel width: 60 mm, table width: 1,240 mm, power: 35 kW (47.59 HP), rapid traverse X-axis: 2 m/min, rapid traverse Y-axis: 100 m/min, rapid traverse Z-axis: 2 m/min, space requirement height: 4,100 mm, space requirement length: 5,100 mm, space requirement width: 2,655 mm, Good day, For sale is a well-preserved and completely functional Sielemann cylindrical grinding machine for the following applications: surface grinding, internal grinding and external grinding. The machine has a swivel stand with 3 different sanding heads for the respective area of application. Complete machine documentation is available and can be presented upon inspection. The Sielemann offered here has always been serviced and maintained, most recently the components listed below were replaced: - 3x New weight compensation cylinders - 1x new hydraulic unit (complete) - New guideway covers - Revised rotary table group Technical data Machine length: 4.400mm Machine width: 2,655mm Machine height: 4.100mm Machine weight: 13.000Kg Control cabinet width: 650mm Control cabinet height: 1.900mm Control cabinet length: 1.800mm Grinding table diameter: 800mm Grinding table load capacity: 800kg Grinding table drive power: 0.21 - 14.5KW Grinding table speed: 100 1/min (both directions) Grinding table workpiece clamping: Magnetic clamping plate incl. T-slots Z-axis travel (grinding table): 550mm Maximum grinding height (Y): 750mm Lubrication pump Masch. Bed: 0,18KW Lubrication pump Masch. Column: 0,1KW Leak oil pump: 0,065KW Hydraulic pump: 1.5KW 1) External round grinding head Spindle drive power: 11KW Spindle speed: 1,450 1/min Grinding wheel: 400x50mm Cone grinding spindle mount: D=65mm Taper pitch: 1:5 Feed speed (Y): 100 mm/min 2) Internal round grinding head Spindle drive power: 5.5KW Grinding wheel: Variable Feed speed (Y): 100 mm/min 3) Flat-round sanding head Spindle drive power: 11KW Spindle speed: 1,800 1/min Grinding wheel: 400x50mm Cone grinding spindle mount: D=65mm Taper pitch: 1:5 Feed speed (Y): 100 mm/min Viewing appointments possible at short notice by arrangement !!! With kind regards R.Suckow / Managing Director UNITTOOL Werkzeugmaschinen GmbH 33758 Schloß Holte Stukenbrock Bjdpfx Afjrntirokelk Görlitzerstraße 9

Condition: used, Year of construction: 1971, grinding depth: 150 mm, grinding diameter: 80 mm, inner diameter: 80 mm, Manufacturer: OVERBECK Model: 250 I Year of construction: 1971 Bsdpfx Afou Ef Dqokelk Workpiece clamping diameter: max. 140 mm Clamping length: max. 150 mm Grindable bore length: 150 mm Bore diameter: max. 80 mm Surface grinding device can be swiveled in by hand Coolant tank with pump without grinding spindle and drive motor was last operated with compressed air spindle Weight: approx. 1400 kg

Condition: refurbished (used), Year of construction: 2026, functionality: fully functional, center height: 150 mm, total length: 620 mm, Mechanics: All wear parts of the machine are replaced, including the infeed spindle in the X-axis. All assemblies are restored to as-new condition. After the overhaul, the machine is comparable to a new machine. Geometry: The machine is completely dismantled down to the guides. Before the geometry of the individual tables and assemblies can be restored, both guides of the X and Z axes are scraped by hand and restored to as-new condition. After completion, the machine receives a measurement report in accordance with the manufacturer's specifications. Painting: Once the geometry of the machine has been restored, it is prepared for repainting. All housings, tables and the machine bed are stripped of old paint, cleaned and repainted. Hydraulics: The entire lubrication system, including the lubrication unit, is replaced. The hydraulic unit is also completely overhauled. Conventional internal cylindrical grinding machine TSCHUDIN HTG 610I Equipment of the machine: Technical data: Center height: 150 mm Center width: 680 mm Grinding length: 620 mm Weight and space requirement of the machine: 2500kg // 2340x1445x1900 mm Machine equipment (standard): 1 pc. Workpiece headstock MK5 Bjdpfxsurw Uyo Afkjlk 1 pc. Control panel 1 pc. Holder for internal grinding spindle 1 pc. Speed control unit for belt spindle (UJ50 / UJ80) FISCHER 1 pc. Hydraulic unit Optional: - Digital measuring system 2-axis - Freely adjustable speed (1-800 rpm) incl. soft start (higher speeds are optionally possible after clarification of technical details) - Separate low speed for part alignment

Condition: good (used), JUNG D22 - Internal Cylindrical Grinding Machine - Machine suitable for internal grinding / plunge grinding - Smallest grindable bore: 14 mm - Largest grindable bore: 150 mm Blodpfx Asyh Hhgofksk - Grinding length with face grinding attachment: 250 mm - 6 workpiece spindle speeds: 46-270 rpm - Spindle head swivels right/left: 30 degrees - Distance from spindle axis to table center: 250 mm - Maximum distance between workpiece spindle and grinding support: 935 mm - Worktable / tilting forwards and backwards: 5 degrees each - Manual / automatic operation - Taper grinding attachment - Steady rest - Three-jaw chuck - Spare grinding spindles (see photos) Dimensions: LxWxH: 2.8 x 1.5 x 1.8 meters / Weight: 3500 kg Errors and omissions excepted.

Condition: ready for operation (used), Year of construction: 1995, functionality: fully functional, machine/vehicle number: 81019 01, grinding depth: 500 mm, grinding diameter: 800 mm, grinding spindle speed: 250 rpm, workpiece diameter (max.): 800 mm, pivoting range: 15 °, Machine in special design with increased grinding diameter and extended, hydraulic cross travel! Reconstructed and modernized in 1995 at the manufacturer's plant in Glauchau and commissioned in 1996. TECHNICAL DETAILS Working area and grinding diameter Internal grinding diameter: 30–630 mm Extended internal grinding diameter max.: 800 mm External grinding diameter max.: 800 mm Workpiece diameter max.: 800 mm Grinding area and table movement Grinding depth: approx. 500 mm Table stroke: 800 mm Grinding diameter with workpiece protection max.: 800 mm Grinding diameter without workpiece protection: approx. 850 mm Distances and adjustments Distance workpiece spindle head – grinding spindle carrier: max. 1,225 mm Adjustment of the internal grinding attachment on the table: max. 545 mm Cross travel of the workpiece spindle stock: max. 650 mm Swiveling of the workpiece spindle stock: max. 15° Workpiece spindle Workpiece spindle speeds: 16 / 22 / 32 / 45 / 63 / 90 / 125 / 180 / 250 rpm Workpiece weight: max. 1,000 kg Spindle head: DIN 55021, size 11 MACHINE DETAILS Control and position display Control type: conventional Cross travel: via geared motor and positioning device Digital position display: HEIDENHAIN, 2 axes Coolant system Coolant system: with magnetic separator Machine weight: approx. 6.4 t EQUIPMENT Coolant system with magnetic separator Fixing devices or machine feet Various grinding wheels Bsdpfxjzqcvto Afkelk Diamond dressing tool Large grinding plate Internal and surface grinding attachment Halogen machine lamp Machine documentation

Condition: like new (used), Year of construction: 2017, functionality: fully functional, machine/vehicle number: 163190, grinding length: 600 mm, grinding width: 300 mm, workpiece weight (max.): 270 kg, grinding wheel diameter: 350 mm, distance table to spindle center: 565 mm, Like-new horizontal surface grinding machine with few operating hours! TECHNICAL DETAILS Grinding area Grinding length: 600 mm Grinding width: 300 mm Work table and workpiece load Table dimensions: 300 mm × 630 mm Maximum workpiece weight: 270 kg Distance spindle axis – table surface: 565 mm Travel distances and feeds Bledpfjzqcvgjx Afkek Travel distance X-axis: 765 mm Travel distance Y-axis: 340 mm Scale ring graduation Y-axis: 0.02 mm Scale ring graduation Z-axis: 0.005 mm Automatic transverse feed Z-axis: 0.1–8 mm Feeds and rapid traverses Hydraulic feed X-axis: 7–23 m/min Rapid traverse Y-axis: 990 mm/min Rapid traverse Z-axis: 460 mm/min Grinding wheel Grinding wheel dimensions: 350 mm × 40 mm × 127 mm MACHINE DETAILS Control type: Conventional 2-axis position indicator: KNUTH Xpos 3.1 Motor power grinding spindle: 5.5 kW Total power requirement: 7 kW Dimensions & Weight Machine dimensions: 2,800 mm × 2,200 mm × 1,890 mm Machine weight: approx. 2.7 t EQUIPMENT 2-axis position indicator KNUTH Xpos 3.1 Grinding wheel Grinding wheel flange Balancing arbour Balancing stand Halogen work light Magnetic chuck 600 mm × 300 mm Adjustment screws Operating tool Automatic transverse and longitudinal feed Hydraulic table longitudinal movement Double V-guides for the longitudinal movement Combined V- and flat guides for the transverse movement Hardened and ground table guide rails with PTFE counter coating Grinding spindle with maintenance-free, preloaded precision angular ball bearings External hydraulic unit Automatic central lubrication

Condition: excellent (used), Specification - Work head Maximum work piece weight between centres 100kg Speed range30/450 rpm Centre - standard/reduced to 5MT / 3MT Swivel angle, clockwise / counterclockwise 15° /90° Wheelhead (X axis) Maximum diameter ground: using a 350mm dia wheel - 300mm Using a 300mm dia wheel - 350mm Total infeed 245mm Maximum programmable dia infeed rate 100mm/min Minimum programmable increment (dia) 0.001mm Swivel range clockwise / counterclockwise 190° / 45° External grinding wheels Wheel size (left) 350 x 50 x 127mm Wheel size (right) 300 x 25 x 127mmm Spindle speeds 1775, 2068, 240rpm Motor 4kW Internal grinding wheels Wheel size 19 - 38mm Wheel spindle speeds 16500,24000,10500rpm Motor 2.2kW Table (Z Axis) Blsdpszh Nfcefx Afkjk Maximum grinding length between centres: 1300X - 700 - 700mm 1300X - 1000 - 1000mm Maximum traverse speed 5000mm/min Minimum programmable increment 0.001mm

Condition: good (used), Year of construction: 1994, For sale OERLIKON MATTISON R.P. 5 Vertical Surface Grinding Machine with Magnetic Circular Table – Ø 1100 mm – 45 kW Description: For sale, a vertical surface grinding machine with a vertical spindle and rotary table, manufactured by OERLIKON MATTISON, model R.P. 5. This is a very powerful and robust machine, ideal for quickly grinding large series, as well as for grinding flat surfaces, discs, blades, large rings, or large mechanical parts. Technical specifications: Brand: OERLIKON MATTISON Model: R.P. 5 Diameter of the magnetic circular table: ~1,100 mm (measured with a meter) Spindle power / main motor power: 44 / 45 kW (60 HP) Motor speed: 750 rpm Motor: SELIN Genova (380 V / 50 Hz / 87 A) Included equipment: Large, recessed electromagnetic circular table Separate electrical cabinet (380 V) Paper filter system / coolant separator with belt conveyor Bodpfxezpzyns Afkjlk Segment grinding wheel head Control panel on the front

Condition: excellent (used), Year of construction: 2018, functionality: fully functional, machine/vehicle number: EB1507, grinding length: 600 mm, grinding width: 350 mm, total height: 1,900 mm, total length: 1,900 mm, total width: 1,900 mm, workpiece weight (max.): 320 kg, grinding height: 312 mm, grinding wheel diameter: 355 mm, distance table to spindle center: 490 mm, table speed: 25,000 mm/min, table load: 320 kg, type of input current: three-phase, grinding wheel width: 25 mm, overall weight: 1,700 kg, grinding spindle motor power: 2,200 W, travel distance X-axis: 700 mm, travel distance Y-axis: 490 mm, travel distance Z-axis: 340 mm, rotational speed (max.): 1,500 rpm, grinding spindle speed: 1,500 rpm, input voltage: 400 V, Equipment: documentation/manual, - Factory number: EB 1507 Bjdpezrinlofx Afkjlk - Automatic vertical feed - Headstock adjustment - Belt filter system - Coolant system - Machine light Grinding length 600 mm Grinding width 300 mm Workpiece height 312 mm Table size 600 x 300 mm Maximum workpiece weight 320 kg Distance grinding spindle center - table 490 mm Table travel, longitudinal 700 mm Table travel, transverse 340 mm Table feed rate 1 - 25 m/min Speed range - grinding wheel 1500 rpm Drive power - grinding motor 2.2 kW Grinding wheel dimensions 355 x 25 x 127 mm Magnetic chuck 610 x 305 mm Headstock adjustment device Operating voltage 400 V Total power consumption 3.0 kW Machine weight approx. 1.7 t Space requirement approx. 1.90 x 1.90 x 1.90 m Hydraulic unit 0.60 x 0.35 x 0.75 m Coolant system 0.70 x 0.40 x 0.80 m

Condition: not inspected (used), Year of construction: 1999, functionality: unexamined, machine/vehicle number: 600004, Flat grinding machine Stöckel FL 10/60 SPS Availability: The collection of the item must be confirmed on August 11th or August 12th, 2026. Which of the two days is scheduled for you will be communicated to you in good time and coordinated with you. Payment terms: Prepayment - by bank transfer Internal No.: 175-2 Technical data: Grinding area: 1000 × 650 × 400 mm X-axis – Longitudinal movement Guide rails: V-flat guides, coated Table clamping surface: 1000 × 600 mm Dimensions of the electromagnetic clamping plate: 1000 x 500 mm Table longitudinal stroke: 1100 mm Table load: 1000 kg Table drive: hydraulic, external Table feed: 3–25 m/min Y-axis – Vertical movement Vertical guides: V-flat guides, coated Lowering direction: Trapezoidal screw spindle Distance table–spindle center: 600 mm Feed rate: 180 mm/min Feed size: - adjustable from 0.001–0.030 mm - 0.001 mm with electric handwheel Z-axis – Transverse movement Guide system: V-flat guides, coated Transverse drive: Trapezoidal screw spindle Transverse feed: adjustable 3–60 mm Maximum transverse adjustment: 575 mm Fine adjustment: 0.001 mm via fine adjustment knob Grinding spindle head Motor design: Flange motor Grinding spindle drive: 11 kW Grinding spindle speed: 1400 rpm Spindle bearing: Precision spindle bearing Spindle lubrication: Grease lubrication Grinding spindle taper: 5:1 / 60 mm Grinding wheel standard: 400 × 100 × 127 mm Scope of delivery: Existing manuals according to the images Balancing scale G+H according to the images Dimensions & Weights: Installation dimensions L x W x H approx.: 4280 x 2900 x 2700 mm Weight approx.: 8000 kg If you have any questions or would like to arrange a viewing, please do not hesitate to contact us! Additional notes: ►On request, we can offer you transport to the destination Bedpfxozmfd Se Afkjlk ►The quoted price is net plus VAT ►The goods are sold without any warranty ►Technical data subject to change ►Subject to prior sale ❗The sale of the goods is exclusively to business customers❗

Condition: used, Year of construction: 1988, grinding length 0600 mm grinding width 200 mm workpiece height 250 mm magnetic plate size 600 x 200 mm Bledpfx Afou Rt E Tskok total power requirement 4,5 kW weight of the machine ca. 2,5 t dimensions of the machine ca. 2000 x 1200 x 1650 mm With magnetic plate 600 x 200 mm and automatic dressing arrangement.

Condition: ready for operation (used), Year of construction: 1988, Horizontal surface grinding machine Okamoto Type PSG 63 – UAN Year of manufacture: 1988 Bljdszrbr Njpfx Afkjk Grinding length: 600 mm Grinding width: 320 mm Max. workpiece height: 500 mm Table travel (longitudinal): 750 mm Table travel (cross): 340 mm Grinding wheel diameter: 350 mm Grinding wheel width: 40 mm Spindle speed: 1500 rpm Rapid vertical feed: 400 mm/min Power: 3.7 kW Automatic feed Magnetic chuck Coolant system Weight: 2500 kg Price: EUR 2,000—plus VAT, ex location

Condition: good (used), grinding length 600 mm grinding width 200 mm max. dia. of grinding wheel 220 mm magnetic clamping plate 500 x 200 mm total power requirement 4,2 kW Bsdpfx Afoxb Eg Aekelk dimensions of the machine ca. 2 x 1,3 x 1,8 m

Condition: used, Year of construction: 2003, max. grinding length 2000 mm max. grinding width 1000 mm max. working height with new grinding wheel 600 mm max. workpiece weight 3200 kg max. table load 4500 kg Clamping area 2860 x 1000 mm Bodpfx Aszn Imxjfkelk Grinding spindle drive 26 kW Spindle speeds 1000 - 3000 rpm Transverse feed rate 1 - 5000 mm/min Vertical feed rate 1 - 5000 mm/min Smallest programmable value 0.001 Cooling unit Mechanical extraction system Paper band filter system Grinding wheel balancing system Pneumatic folding dresser Control system ABAMATIC 1 N.D.

Condition: ready for operation (used), Year of construction: 2021, DELTA LC 400 / Year of manufacture 2021 / Rotary table grinding machine -CE marking -Year of manufacture 2021 Bedpfx Ajzrpdmsfkslk -Magnetic table - rotary table 300mm -Max. grinding diameter 400mm -Distance column - grinding spindle axis approx. 315mm -Grinding height - magnet - grinding wheel approx. 215mm -Grinding spindle speed 2840 rpm -Fine feed 0.01mm -Lateral retraction device -Spindle motor approx. 3 KW -Dimensions of cup wheel 200x80x78mm -Machine enclosure -Coolant system -Documentation Dimensions: L x W x H 1.3 x 0.8 x 1.8 meters / Weight approx. 800kg Subject to errors and omissions.

Condition: excellent (used), Year of construction: 2019, functionality: fully functional, OKAMOTO ACC-16*24SA1 Precision Surface Grinding Machine Bjdpfx Afjzmhknokjlk Okamoto Precision Surface Grinding Machine ----- Model ACC-16•24SA1 Automatic Wheelhead Approach, Retraction to Start Position, Automatic Dress Cycle with Wheel Wear Compensation, Shift Plunge Cycle--- ----- Grinding Capacity 16”x 24” Standard Accessories • Automatic Overhead Wheel Dresser • Touch Screen Controller with 10” Display With Compensation, including Diamond Tool • Vertical & Crossfeed Pulse Generator • Rapid Wheel head Retraction • Teach-Input Positioning • Load Meter for Grinding Wheel Motor • 5 HP Wheel Spindle Motor • Shift-Plunge Rough Grinding Cycle • Stainless Steel Wheel Guard • Selectable Rough/Fine Infeed Grinding Method • Leveling Bolts with Plates • Table Park for Safety • Necessary Tools & Tool Box • Stainless Steel Splash Guard • Installation and Training • Instruction Manual

Condition: excellent (used), functionality: fully functional, machine/vehicle number: 1761-1700, 457 x 152mm capacity. Equipped with magnetic chuck, power rise and fall to wheel head, table guard, coolant system, and dust extraction. SPECIFICATION Jones & Shipman Model 540P Working Surface of table 457 x 152mm Longitudinal traverse of table, hand and hydraulic 483mm Total cross traverse of table, hand and hydraulic 168mm Floor to table height 1035mm Table traverse speed range per min 1.5 – 18m Cross feed range per stroke at each reversal 0.178 – 1.78mm Micrometer cross feed graduated in Vertical feed adjustment in increments of 0.002mm Vertical movement of wheelhead (max) 280mm Wheel spindle center to table (min) 50mm Size of grinding wheel 180 x 13 x 31.75mm bore Speed of wheel 2880rpm Wheelhead motor 1.5kW Hydraulic pump motor 0.55kW Machine in Imperial execution MACHINE EQUIPPED WITH Magnetic chuck Power rise and fall to wheel head Table guard Wheel guard Coolant System Blodsnxi Uuepfx Afkok Dust extraction

Condition: excellent (used), Year of construction: 1984, functionality: fully functional, machine/vehicle number: BO 94392, A familair machine in any toolroom, this Jones and Shipman 540P is equipped with a 6″ x 18″ magnetic chuck, power rise and fall, coolant system and dust extraction. A toolroom institution: USED Jones & Shipman Model 540P Horizontal Spindle Surface Grinding Machine Specification Working Surface of the table 457 x 152mm Bljdjnxi R Ujpfx Afkjk Longitudinal traverse of table, hand and hydraulic 483mm Total cross traverse of table, hand and hydraulic 168mm Floor-to-table height 1035mm Table traverse speed range per min 1.5 – 18m Cross-feed range per stroke at each reversal 0.178 – 1.78mm Micrometer cross feed graduated in Vertical feed adjustment in increments of 0.002mm Vertical movement of wheelhead (max) 280mm Wheel spindle centre to table (min) 50mm Size of grinding wheel 180 x 13 x 31.75mm bore Speed of wheel 3000rpm Wheelhead motor 1.5kW Hydraulic pump motor 0.55kW Machine in Imperial execution Machine equipped with Magnetic chuck Power rise and fall to wheel head Table guard Wheel guard Coolant System Dust extraction Lighting

Condition: used, Year of construction: 2000, grinding length 300 mm grinding width 500 mm Blsdpfezpf Ucjx Afksk

Condition: used, This G-H grinding technology – CNC surface grinding machine, model: FS 640 SD – will be auctioned online as part of our industrial auction / machinery auction due to the closure of the J&S GmbH Automotive Technology location – including workshop equipment, tools, storage equipment, materials, office furniture, and canteen equipment. Bedpfx Aszp Dd Aefkolk You can find this and many other items on our platform.

Condition: good (used), Year of construction: 1989, ELB HK-Orion Precision Surface Grinding Machine A high-quality, robust horizontal surface grinding machine from the premium brand ELB-Schliff. This machine is ideally suited for workshops, toolmakers, and demanding users who require absolute precision in surface grinding. Equipment & Condition: Electromagnetic chuck: Fully functional, including the associated 130V DC control system operated via the control panel. Coolant system: Separate, external settling tank including a functional coolant pump and return chute. Operation: Clear, swiveling control panel for managing axis movements. Technical Data Manufacturer: ELB-Werkzeug- u. Maschinenbau Machine No.: 20600 Operating voltage: 3x 380 V / 50 Hz (three-phase current) Rated current / Fuse rating: 20 A / 25 A Control voltage: 220 V / 24 V Magnetic chuck DC voltage: 130 V / 4 A Blodpeznt Hdofx Afkek Year of manufacture: 08/1989 "Everything from a single source: We would be happy to offer you suitable bank financing for your project." komplett-konzept.leasingo.de You can find more items—both new and used—in our shop! International shipping costs available upon request!

Condition: ready for operation (used), functionality: fully functional, grinding length: 800 mm, grinding width: 350 mm, Magnet, 800 x 350 mm. Bodpezimmmjfx Afkolk

Condition: ready for operation (used), Year of construction: 1986, functionality: fully functional, The machine is in good working order. See the video. Blodpjzimhwefx Afkjk