Used Bernardo Fk2 for sale (242)

Condition: new, x-travel 1000 mm y-travel 360 mm z-travel 400 mm spindle taper ISO 40 ISO table: 1370 x 320 mm feed: H 80 - 830 / V 23-625 mm/min. turning speeds H 35 - 1500 / V 45 - 1660 U/min distance spindle /table H 30 - 430 / V 210-610 mm rapid traverse Z Achse 750 mm/min throat 305 - 805 mm T-slots 3 x 14.0 mm table - swivable ° workpiece weight max. 300 kg coolant pump 25.0 L/min. total power requirement 7.6 kW weight of the machine ca. 1540 kg range L-W-H 1840 x 1830 x 2050 mm - Large rectangular guide in y and z axes - ensure increased stability - 8x automatic feeds and rapid traverse in all axes - driven by servo motor - Universal milling head system "Huron", adjustable to all angular positions Dedpexaagnsfx Aggokt - Swiveling control panel with ergonomically placed switches - Heavy machine stand made of gray cast iron for vibration-free work - Very smooth running thanks to ground gears running in an oil bath - Upper arm with clearly structured gear box for the spindle speed - Digital position display for x, y and z axes included in delivery - Precisely surface-machined cross table with T-slots Scope of delivery - 3-axis digital display ES-12 H with LCD display - Drawbar spindle M16 - LED machine light - Feed for x, y and z axes - Coolant system - Counter bearing - Long milling arbor ISO 40 / 27 mm - Combined milling arbor ISO 40 / 27 mm - Coolant tray - Adjustable protective device - Central lubrication for x, y and z axes - Operating tool

Condition: new, turning length 3000 mm turning diameter 660 mm turning dia. in gap 900 mm turning diameter over slide 460 mm turning speeds 25 - 1600 U/min quill: 5 MK quill travel 235 mm spindle bore 105,0 mm engine output 7,5 kW spindle taper DIN 55029 D 1-8 weight of the machine ca. 3.300 kg. dimensions 4.630 x 1.200 x 1.529 mm Scope of delivery - 3-axis digital display ES-12 V with LCD display - Slip clutch - Rapid traverse longitudinal and planar - LED machine light - 3-jaw steel chuck PO3-315 mm / D8 - Clamping disk 450 mm - Fixed steady rest - passage diameter max. 180 mm - Follow-on steady rest - passage diameter max. 120 mm - 2 centering points - Motor with magnetic brake in accordance with CE standard - Foot pedal with brake function in accordance with CE - Initial filling with Shell Tellus 46 - Coolant system - Quick-change tool holder with 4 inserts - Protective device for quick-change tool holder - Change gears - Reduction sleeve - Chip back wall - Cable routing via energy chain Dodpfjxaahlsx Aggokt - Operating tool

Condition: new, pressure 20,0 t stroke 185 mm table surface area 170 mm Breite column travel between the guideways 510 mm weight of the machine ca. 112 kg dimensions of the machine ca. 1630 x 560 x 730 mm Furnishing: - Standard with pressure cylinder that can be moved to the left and right - For aligning, pressing, bending, assembling gears, discs, etc. Dksdexaapcopfx Aggjt - Standard with foot pedal and hydraulic hand pump for piston delivery - Standard with support prism for aligning shafts - With automatic piston retraction by integrated return spring as standard - Height-adjustable press table with locking bolts - Large manometer for reading the compressive force - Including two-stage hydraulic pump - Robust construction with welded steel frame

Condition: new, turning length 3000 mm turning diameter 660 mm turning dia. in gap 870 mm turning diameter over slide 420 mm turning speeds 36 - 1600 U/min Dkedpfxsxabycj Agget quill: 5 MK quill travel 150 mm spindle bore 105,0 mm engine output 7,5 kW spindle taper DIN 55029 D 1-8 weight of the machine ca. 3990 kg. dimensions 4500 x 1280 x 1650 mm Scope of delivery - Slip clutch - Rapid traverse longitudinal and planar - LED machine light - 3-axis digital display ES-12 V with LCD display - 3-jaw chuck PS3-315 mm / D8 - Clamping disk 630 mm - Fixed steady rest - passage diameter max. 250 mm - Follow-on steady rest - passage diameter max. 110 mm - 1 centering point / 1 follow-on punch point - Motor with magnetic brake in accordance with CE standard - Foot pedal with brake function in accordance with CE - Initial filling with Shell Tellus 46 - Coolant system - Quick-change tool holder with 4 inserts - Protective device for quick-change tool holder - Reducing sleeve - Chip back wall - Operating tool

Condition: new, pressure 30 t stroke 150 mm table surface area 185 mm Breite column travel between the guideways 530 mm weight of the machine ca. 162 kg dimensions of the machine ca. 800 x 700 x 1805 mm Dodpfx Agjxabg Negokt

Condition: new, width of the strips 150 mm band length 2000 mm band speed 29.0 m/sek Djdpfxjxabkze Aggjkt grinding width 460 x 150 Plantisch mm Dust suction hood 100 mm total power requirement 4.0 kW 100% ED weight of the machine ca. 84.0 kg range L-W-H 1080 x 520 x 1000 mm Description : - Good sanding performance due to high belt speed - Quick adjustment for horizontal and inclined position - Continuous flat grinding surface for optimal grinding of long workpieces - Constant belt tension through spring-loaded tensioning device - Universally applicable for grinding edges, surfaces and for cylindrical grinding - Including quick-release system for quick strap changes - Simple adjustment of the parallel belt run by means of an adjusting screw - Graphite coating on the flat grinding surface increases the sliding properties of the sanding belt Scope of delivery : - Sanding belt K 80 - Hinged protective screen - Sanding and support table - workpiece stop - Dust extraction nozzle - Separate off button - underframe

Condition: new, plate thickness 1.20 mm throat 270 (140) mm distance between roll centers 60.0 mm total power requirement manuell kW weight of the machine ca. 46.0 kg dimensions of the machine ca. 600 x 250 x 500 mm Furnishing: - various replacement rollers - hand crank Dkedpfexabmcjx Agget - front stop

Condition: new, turning length 850 mm turning diameter 400 mm swing diameter over bed slide 245 mm spindle bore 52.0 mm turning speeds 45 - 1800 U/min bed width 260 mm spindle taper DIN 55029 D 1-5 taper in tailstock 3 MK quill travel 120 mm total power requirement 3.0 / 4.5 kW weight of the machine ca. 1255 kg range L-W-H 1900 x 1000 x 1610 mm Equipment: - 3-axis digital display ES-12 V with LCD display - 3-jaw chuck PS3-200 mm / D5 - Clamping disk 320 mm - Fixed steady rest - passage diameter max. 130 mm - Follow-on steady rest - passage diameter max. 100 mm - Coolant system - Quick-change tool holder with 4 inserts - Protective device for quick-change tool holder - Micrometer longitudinal stop - Slip clutch - Motor with magnetic brake in accordance with CE standard - Initial filling with Shell Tellus 46 - Extendable chip tray - LED machine light - Change gears - Reduction sleeve Dksdpfx Asxaaxweggst - 2 centering points - Chip rear wall - Operating tool

Condition: new, x-travel 1000 mm y-travel 360 mm z-travel 400 mm spindle taper ISO 40 ISO table: 1370 x 300 mm feed: 30-830 / 23-625 mm/min. turning speeds 45 - 1660 U/min distance spindle /table 60 - 460 mm rapid traverse Z Achse 750 mm/min throat 95 - 575 mm Dkedpfjxaak Tjx Aggot total power requirement 3.0 kW weight of the machine ca. 1505 kg range L-W-H 1740 x 1860 x 1900 mm - Large rectangular guide in y and z axes - ensure increased stability - 8x automatic feeds and rapid traverse in all axes - driven by servo motor - Universal milling head system "Huron", adjustable to all angular positions - Swiveling control panel with ergonomically placed switches - Heavy machine stand made of gray cast iron for vibration-free work - Very smooth running thanks to ground gears running in an oil bath - Upper arm with clearly structured gear box for the spindle speed - Digital position display for x, y and z axes included in delivery - Precisely surface-machined cross table with T-slots Scope of delivery - 3-axis digital display ES-12 H with LCD display - Drawbar spindle M16 - LED machine light - Feed for x, y and z axes - Coolant system - Counter bearing - Long milling arbor ISO 40 / 27 mm - Combined milling arbor ISO 40 / 27 mm - Coolant tray - Adjustable protective device - Central lubrication for x, y and z axes - Operating tool

Condition: new, turning length 1500 mm turning diameter 560 mm turning diameter over slide 350 mm turning speeds 25 - 1600 U/min swing diameter over bed slide 350 mm Djdpfx Agoxaam Isgekt turning dia. in gap 785 mm quill travel 180 mm spindle bore 105,0 mm engine output 7,5 kW spindle taper DIN 55029 D 1-8 quill: 5 MK weight of the machine ca. 2.370 kg. range L-W-H 2.840 x 1.150 x 1.460 mm Scope of delivery: - 3-axis digital display ES-12 V with LCD display - 3-jaw chuck PS3-315 mm / D8 - Clamping disk 450 mm - Fixed steady rest - passage diameter max. 180 mm - Follow-on steady rest - passage diameter max. 120 mm - 2 centering points - Initial filling with Shell Tellus 46 - Motor with magnetic brake in accordance with CE standard - Foot pedal with brake function in accordance with CE - Coolant system - Quick-change tool holder with 4 inserts - Protective device for quick-change tool holder - Slip clutch - LED machine light - Change gears - Reduction sleeve - Chip back wall - Operating tool

Condition: new, bore capacity in steel (diameter) 32,0 mm throat 230 mm bore stroke 120 mm morse taper 3 MK table: 400x320 mm turning speeds 105 - 1725 U/min total power requirement 1,2 kW weight 245 kg range L-W-H 470x810x1710 mm Furnishing: - Compact, stable cast iron construction in a modern design - Infinitely variable speed control - is changed The speed is read on a digital display - Table height adjustment via rack and crank - Right and left rotation of the quill for thread cutting - Powerful 2-stage motor, speed range from 105 - 1725 rpm - Base plate with T-slots for clamping high workpieces - Safety switch with undervoltage release - The spindle runs in the precision ball bearing scope of delivery Dodpfxew U U N Io Aggskt - Key chuck 1 - 13 mm / B 16 - Drill chuck arbor MK 3 / B 16 - Reducing sleeve MK 3/2 - Digital speed display - LED machine light - Height-adjustable protective cover

Condition: new, square edge steel 16 x 16 mm flat steel 100 x 5 mm L-beam 60 x 8 mm round bar steel 18.0 mm weight of the machine ca. 33.0 kg Properties : - For precise cold and hot bending of flat, round and square steels - Sturdy design for bolting to the workbench - Infinitely adjustable bending stop with locking pin - With eccentric quick clamping for efficient working - Readable bending angle up to 120 - High repeat accuracy thanks to bending angle stop - Ideal for repair workshops and locksmiths - - - - - - - - - - Cold bending capacity Flat steel 100 x 5 mm 65 x 10 mm Round steel 18.0 mm Square steel 16 x 16 mm Angle steel 60 x 8 mm Bending capacity hot Flat steel 100 x 15 mm 75 x 20 mm Round steel 27.0 mm Square steel 25 x 25 mm Angle steel 100 x 12 mm - - - - - - - - - - Dsdjxcux Rspfx Aggskt Scope of delivery: - Bending plate sharp / round - Radius bending plate R 20 / R 25 - Offset block - Bending plate for round bar - Offset plate - Radius bending plate R 10 / R 15 - Angle stop - Clamping block with eccentric clamp - Material stop

Condition: new, through-put width 580 mm working heigth 615 mm discs 570 x 260 mm Air consumption 400 l/min. air pressure 2.7 - 5.5 bar 0 184 Liter 0 Luft .. 3/8 Zoll weight 125 kg Dodpfx Agexaagzegjkt range L-W-H ca. 1350 x 1300 x 1800 mm Furnishing: - Working space: 1220 x 615 x 580 mm (LxWxH) - including sandblasting gun (grain size 0.149 - 0.250 mm can be used) - Including container for blasting material - including dust extraction - freely movable foot switch - Lighting in the work area - Instruction manual in German

Condition: new, I - beam section - flat steel 100 x 15 (d 450) mm I-beam section - upend 60 x 10 (d 500) mm L-beam 50 x 6 (d 1000) mm round material 35.0 (d 600) mm bar material dia. max. 70 x 2 (d 1000) mm square material 50 x 50 x 3 mm bending speed 4.5 m/min roll diam. toproll 155 mm bore 50.0 mm total power requirement 1.5 kW weight 400 kg range L-W-H 990 x 750 x 1350 mm Equipment: Dkodpszx Hd Refx Agget - robust electro-motorized ring/profile bending machine - machine base frame, with rear shelf - horizontal and vertical work possible - 1x freely movable foot switch - segmented standard rollers (divided) - 2x motor-driven rollers - manual delivery of the top roller - analog position display of the top rollers (scale) - manually adjustable side/straightening rollers - CE mark / declaration of conformity - operating instructions in German

Condition: new, pressure 50.0 t stroke 200 mm table surface area 730 x 205 mm dayligth 75 - 1050 mm column travel between the guideways 730 mm weight of the machine ca. 292 kg range L-W-H 1040 x 800 x 1880 mm Dksdpexaa Ixjfx Aggst Description : - Standard with cable winch - for easy height adjustment of the support table - Piston delivery either manually or pneumatically - Powerful workshop presses for craft and repair businesses - Optimum price-performance ratio thanks to rational design - The standard foot pedal keeps your hands free for the workpiece - Increased range of application thanks to the optionally . available pressure mandrel set (10 pieces). - Pressure cylinder with integrated return spring for piston return - Welded steel frame for heavy use and high stability - Versatile in use thanks to the pressure cylinder that can . be moved to the left and right

Condition: new, sheet width 2065 mm plate thickness 1.20 mm daylight opening 30.0 mm bending angle max. 0 - 135 ° total power requirement manuell weight of the machine ca. 500 kg dimensions of the machine ca. 2400 x 1115 x 1500 mm - Universally applicable bending machine for plumbing and repair shops - Robust construction in a modern design Dedpfx Agexaat Iegskt - easy adjustment of the upper beam by means of a foot pedal, Hands are free for the workpiece - manual bending machine for standard bending tasks - segmented upper beam for a large number of bending options - An auxiliary cylinder supports the bending process when folding - faster and easier bending process using a bow handle - easy adjustment of the lower beam to the respective sheet thickness - high upper beam for the production of high-edged profiles Furnishing : - Segmented upper cheek - back gauge - bending segments 38 | 38 | 38 | 50 | 50 | 50 | 50 | 76 | 76 | 101 | 127 | 152 | 203 | 254 | 254 | 254 | 254 mm

Condition: new, square edge steel 20x20 / 25x25 mm flat steel 100 x 7.0 mm round bar steel 22.0 / 27.0 mm L-beam 100 x 10 mm weight of the machine ca. 33.0 kg. range L-W-H 900 x 430 x 310 mm Features - For precise cold and hot bending of flat, round and square steels - Sturdy design for bolting to the workbench - Infinitely adjustable bending stop - With eccentric quick clamping for efficient working - Readable bending angle up to 120 - High repeat accuracy thanks to bending angle stop - Ideal for repair workshops and locksmiths Djdpfxoxcuyhs Aggjkt - - - - - Bending performance "cold" : Flat steel 100 x 7 mm 65 x 12 mm Round steel 22.0 mm Square steel 20 x 20 mm Angle steel 100 x 10 mm - - - - - Bending capacity "hot" : Flat steel 100 x 15 mm 75 x 20 mm Round steel 27.0 mm Square steel 25 x 25 mm Angle steel 100 x 15 mm - - - - - Scope of delivery - Bending plate - Angle stop stepless - Clamping block with eccentric clamp - Material stop

Condition: new, sheet width 1270 mm plate thickness 2.0 mm daylight opening 48.0 mm daylight opening 150 mm ohne Segmente bending angle max. 0 - 135 ° work height max. 900 mm weight of the machine ca. 465 kg dimensions of the machine ca. 1620 x 1070 x 1280 mm Furnishing: - Swivel bending machines with segm. Upper, lower and bending beam - Universally usable bending machine for sheet metal works and repair shops - Robust construction in a modern design - Easy adjustment of the upper beam using a foot pedal - Hands are free for the workpiece - Manual bending machine for standard bending tasks - Segmented upper beam for a large number of bending possibilities - Optimum price-performance ratio - Quick and easy bending process using the bow handle - Non-slip rubber covering on the foot pedal for safe working - Easy adjustment of the lower beam to the respective sheet thickness - High upper beam for the production of high folded profiles Dsdpfxjxabquo Aggjkt Scope of delivery : - Segmented upper, lower and bending beam - manual backgauge - Corner segment left / right each 75 mm | 25 | 30 | 35 | 40 | 45 | 50 | 75 | 100 | 200 | 250 | 270mm

Condition: new, turning length 2000 mm turning diameter 560 mm turning diameter over slide 350 mm turning speeds 25.0 - 1500 U/min swing diameter over bed slide 350 mm Dkjdjxabtpepfx Aggst turning dia. in gap 785 mm quill travel 180 mm quill: 5 MK spindle bore 105 mm spindle taper DIN 55029 D 1-8 engine output 7.5 kW weight of the machine ca. 2720 kg range L-W-H 3340 x 1150 x 1610 mm Equipment: - 3-axis digital display ES-12 V with LCD display - 3-jaw chuck PS3-315 mm / D8 - Clamping disc 450 mm - Fixed steady rest - passage diameter max. 180 mm - Follow-on steady rest - passage diameter max. 120 mm - 2 centering points - Initial filling with Shell Tellus 46 - Motor with magnetic brake in accordance with CE standard - Foot pedal with brake function in accordance with CE - Coolant system - Quick-change tool holder with 4 inserts - Protective device for quick-change tool holder - Slip clutch - LED machine light - Change gears - Reduction sleeve - Chip back wall - Operating tool

Condition: as good as new (ex-display), Year of construction: 2023, pressure 40.0 t chamfer lenght 1600 mm distance between columns 1200 mm column arm 200 mm ram stroke speed 60.0 mm/sec return speed 80. mm/sec work speed 60.0 mm/sec work stroke 100 mm table height 760 mm table width 150 mm oil volume 130 ltr. voltage 400 Volt Control ESA E21 total power requirement 4.0 kW weight 3030 kg range L-W-H 2050 x 1800 x 2030 mm Demonstration/demo machine (!!) From our showroom (like new) With very few operating hours Furnishing: - compact hydraulic press brake - BERNARDO NC control model E21 - swiveling control panel Dedpjxabumsfx Aggokt - electrical adjustment of the backgauge - Back stop on recirculating ball spindles - electrical adjustment of the immersion depth - Laser protection device in front - Upper deer foot tool - divided - Tool holder with quick change system - Universal die block - side + rear protective device - 2x front support arms - movable double foot switch (operation)

Condition: new, drill diameter 2.0 - 20.0 mm lip angle 90 - 135 ° turning speeds 4800 U/min voltage 230 Volt engine output 0.12 kW weight 8.6 kg range L-W-H 285 x 130 x 170 mm The handy DG 20 M drill grinding machine is ideal for grinding twist drills made of HSS, cobalt and hard metal. Thanks to the adjustable Dodpfx Aoxablxsggokt tip angle of 90° to 135°, this model can be used universally for 2-edged twist drills. Properties: - For grinding HSS and hard metal twist drills from 2 - 20 mm - ER 20 and ER 25 collets also enable clamping of intermediate sizes - Optimum grinding result thanks to the specially guided collet - Includes device for sharpening the drill tip - Universally adjustable tip angle from 90° - 135° - Fast and easy grinding process Scope of delivery: - CBN grinding wheel - ER 20 collets, 3 - 12 mm * 11 pieces (3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 /12 / 13 mm) - ER 25 collets, 14 - 20 mm * 7 pieces (14 / 15 / 16 / 17 / 18 / 19 / 20 mm) - Collet holder ER 20 or ER 25

Condition: new, bore capacity in steel (diameter) 40,0 mm throat 320 mm bore stroke 160 mm morse taper 4 MK table: 505 x 425 mm swivelling +/- 50 Grad T-slots 14,0 mm turning speeds 90 - 1455 U/min quill feed 0,1/0,2/0,3 mm/U column diameter 120 mm total power requirement 1,0 / 1,5 kW weight of the machine ca. 380 kg. range L-W-H 500 x 930 x 1870 mm characteristics - Vario drive for precise setting of the speed - Quill infeed either by hand or by mechanical feed - Easy tool change thanks to automatic tool ejector - Set speed can be read quickly and easily using the digital display - Solid, swiveling gray cast iron table with T-slots and coolant channel - The coolant system and lighting are included in the scope of delivery - Adjustable drilling depth stop, drilling depth can be read off using a scale - Right-left rotation device for thread cutting scope of delivery - Drill chuck arbor MK 4 / B 16 - coolant device - Digital speed display Dksdpfxoxaazrs Aggot - Keyless chuck 1 - 16 mm / B 16 - Reducing sleeve MK 4/3, MK 4/2, MK 3/1 - LED machine light - Automatic tool ejector - Height-adjustable protective cover

Condition: as good as new (ex-display), Year of construction: 2025, bore capacity in steel (diameter) 35.0 mm bore capacity in cast iron 40.0 mm threading M 24 in Stahl throat 320 mm morse taper 4 MK bore stroke 160 mm turning speeds 65 - 3250 U/min table: 500 x 420 mm throat 320 mm weight 375 kg range L-W-H 600 x 870 x 2170 mm Year 2025 showroom model (!!) Approx. 1 hour of operation Special price on request Furnishing: - Infinitely variable speed, ideal for - Set the desired cutting speed. - Automatic tool ejector and thread cutting device as standard - Electromechanical drilling feed, adjustable from 0.1 - 0.3 mm / rev - Solid gray cast iron table with rotating and swiveling support surface - T-slots in the machine base enable high workpieces to be clamped - Guaranteed concentricity 0.02 mm, measured in the quill - Hardened and ground gears ensure smooth running Dodpfexaabrex Aggokt - Adjustable drilling depth stop with an easily readable scale Scope of delivery: - Key chuck 1 - 13 mm / B 16 - Drill chuck arbor MK 4 / B 16 - Reducing sleeve MT 4/3, MT 4/2 - coolant device - Thread cutting device - Electromagnetic spindle feed - Automatic tool ejector - LED machine light - First filling with Shell Tellus 46 - Digital speed display - Height-adjustable protective cover

Condition: new, bore capacity in steel (diameter) 32.0 mm threading max. M 24 throat 265 mm bore stroke 150 mm morse taper 3 MK turning speeds 320 - 1820 U/min table-size 332 x 332 mm T-slots 14.0 mm column diameter 100 mm 400 x 380 mm distance spindle/base plate max. 735 mm voltage 400 V total power requirement 2.2 kW weight 246 kg range L-W-H 520 x 920 x 1380 mm Description: - robust table drilling machine with thread cutting device Dedsxabxropfx Aggjkt - very smooth running thanks to pulleys made of gray cast iron - drive: V-BELT - quality ball bearings ensure a high concentricity of the spindle - large drilling table with diagonally running T-slots - drilling table height adjustment via rack - thread cutting device - powerful and high-torque aluminum motor in accordance with IP 54 - standard with T-slots in the ground base plate - ergonomic handles for comfortable working - foldable drilling spindle guard - emergency stop button at the front - manual drilling depth adjustment - control cabinet - left with main switch

Condition: new, width of the strips 100 mm band length 2000 mm band speed 15 + 30 m/sel Dsdoxab Dzspfx Aggjkt tube diameter 20 - 76 mm angle adjustable from - to 30 - 90 Grad Dust suction hood 2 x 75.0 mm motor speeds: 1420 / 2660 Upm. face grinding attachment 400 x 100 mm total power requirement 2.5 / 3.3 kW weight of the machine ca. 148 kg. range L-W-H 750 x 1400 x 1200 mm Furnishing : - Constant belt tension through spring-loaded tensioning device - Standard with cylindrical grinding device - for grinding diameters of diam. 20-76 mm - Quick and easy setting of the desired grinding angle - Graphite coating on the flat grinding surface increases the sliding properties of the sanding belt - Large plan grinding surface with protective cover - Slow belt speed (15 m / sec.) - ideal for grinding stainless steel and aluminum - User-friendly tape change, quick and uncomplicated - Quick and easy changing of the grinding rollers without tools - Various grinding angles from 30 ° to 90 ° are possible without any problems - Shorter processing times compared to milling scope of delivery - Sanding belt K 36 - Rubberized sanding roller - 1 piece sanding roller for 1 1/4 "pipe (42/44 mm pipe) - 2 pcs. Hinged protective panels - Sanding and support table - 2 x dust extraction nozzle diam. 75 mm - 2 pieces of chip collector - graphite coating - Motor protection switch