Used Rotary Table Grinding for sale (20,778)

Condition: good (used), Year of construction: 1992, functionality: fully functional, Technische Details Werkstückdurchmesser 1000 mm Werkstückgewicht - kg Werkstückhöhe - mm Steuerung Schleifspindelmotor 11 kW Gesamtleistungsbedarf 25 kW Maschinengewicht ca. 6500 kg Ncsdjy Tlrropfx Amnot Raumbedarf ca. 4100 x 3200 x 2600 mm Zusatzinformationen Maschine kommt aus einer Betriebsschließung Ausstattung: Kühlmitteleinrichtung 500 Liter mit Papierbandfilter 4 Stück Schleifscheiben (3 Stück unbenutzt) Technische Daten: Rundtischdurchmesser 800 mm Max. Abstand Rundtisch zu Schleifspindelmitte 850 mm Schleifscheibendurchmesser 400 mm Schleifscheibenbreite 80 mm

Condition: used, Year of construction: 1995, rotary table diameter 600 mm boring diameter 600 mm grinding height 450 mm control Siemens Sinumerik 840 C Nsdsy Nfdaepfx Amnect total power requirement 30 kW weight of the machine ca. 14,5 t

Condition: ready for operation (used), DELTA LC 400 / Rotary Table Surface Grinding Machine -Magnetic chuck (rotary table) 400mm -Max. grinding diameter 400mm -Grinding height (distance table – grinding wheel) approx. 220mm -Grinding wheel dimensions / standard / 200x80x78mm -Spindle speed / grinding spindle 2840 rpm -Fine feed 0.01mm -Distance / column – grinding wheel axis 315mm Nedpfx Aey Sbgcsmnsct -Spindle motor / 3kW -Lateral grinding wheel dresser -Machine enclosure -Coolant system Dimensions: LxWxH 1.2x0.8x1.8 meters / Weight 700Kg Errors and omissions excepted

Condition: good (used), Year of construction: 2003, ELB Rotary 40 NC-K rotary table surface grinding machine, table diameter 400 mm, grinding height 300 mm, year of manufacture 2003, ELN NC-K control, spindle power 4 kW, grinding wheel 300 x 50 x 76.2 mm, rotary table with magnetic chuck diameter 400 mm, full enclosure, coolant system with paper band filter, can be inspected under power, we are happy to take care of installation / training and subsequent on-site service! Financing/leasing is no problem, we are happy to provide an offer! Ncsdpfx Amjuiafuonst

Condition: ready for operation (used), Grinding rotary table machine SIELEMANN RF-PE with digital control. Nedpjyzymmjfx Amnoct

Condition: used, Year of construction: 2013, functionality: fully functional, Mobile valve machining / turning machine Unigrind FDA 500 for sale. The machine is used, in good condition and fully operational. Inspection and testing on site are possible. The Unigrind FDA 500 is designed for machining and repair of valve sealing surfaces, seats, and flanges. The equipment allows precise turning, milling, and surface refurbishment directly at the worksite. Specification: Model: Unigrind FDA 500 Year: 2013 Mobile valve machining machine Suitable for repair of valves, flanges, and sealing surfaces Accurate machining of flat and conical surfaces Fits various types of industrial valves Compact and robust design Professional industrial equipment German quality Ncsdpoy R R Imsfx Amnet More info: Unigrind FDA 500 Suitable for energy, oil, gas, chemical, and industrial companies as well as repair workshops. If you have further questions, we will be happy to assist you.

Condition: used, Year of construction: 2019, functionality: fully functional, For sale: Unigrind KSM600 flat surface grinding/lapping table. The equipment is in good condition and fully operational. Inspection and testing on site are possible. The Unigrind KSM600 is designed for grinding and lapping flat sealing surfaces. It is suitable for machining and refurbishing surfaces of valves, gates, flanges, and other industrial components. Specification: Model: Unigrind KSM600 Stationary flat surface grinding/lapping table Intended for machining flat sealing surfaces Suitable for valve, gate, and flange repair Robust industrial housing Stable and precise processing Ncedpfx Amoy R Rl Sjnot Simple and user-friendly operation Professional industrial equipment More information: Unigrind KSM600 Suitable for repair workshops, energy, oil, gas, and industrial companies. If you have any further questions, we will be happy to assist you.

Condition: excellent (used), Year of construction: 1980, functionality: fully functional, machine/vehicle number: 92ML/109/11821, rotary table diameter: 1,220 mm, grinding height: 572 mm, total width: 4,394 mm, total length: 3,353 mm, overall weight: 13,700 kg, grinding wheel diameter: 711 mm, spindle speed (max.): 550 rpm, power: 35 kW (47.59 HP), table diameter: 1,219 mm, Lumsden 92 ML Vertical Spindle Rotary Surface Grinder , 48 Inch dia chuck, autosizing, table jog facility, Filtermist unit fitted with (2) extraction vents to rear of table guards, fitted with segmented wheel, serial number 92ML/109/11821. Machine tools manuals. Coolant filtration tank. Also with unused grinding stones segmented. Table Diameter 48″ / 1219mm, Segmental Wheel Dia. 28” / 711mm, Max. Height Capacity 22.5″ / 572mm, Spindle Speed 550rpm, Table Speed 6 & 18rpm, Auto Feed 0.004-0.04 ins/min – 0.1-1.0 mm/min, Spindle Motor 50HP / 35Kw, Floor Space 14′ x 11′ / 4394 x 3353mm, Approx. Net Weight 12T/12200Kg, Approx. Gross Weight 13.5T /13700Kg1220 Njdpfsxgq D Djx Amnoct

Condition: refurbished (used), Year of construction: 1989, functionality: fully functional, rotary table diameter: 1,500 mm, grinding height: 457 mm, total height: 3,124 mm, total width: 3,150 mm, total length: 4,165 mm, overall weight: 15,000 kg, grinding wheel diameter: 863 mm, grinding spindle speed: 450 rpm, power: 45 kW (61.18 HP), table diameter: 1,500 mm, LUMSDEN Model 93ML Vertical Rotary Surface Grinder. Refurbished with new bearings in table and spindle, reconditioned main motor, new rectifyer, lubrication system, new control panel. Serial Number: to be advised New 1980's originally Country of Origin: UK Ncodowugh Djpfx Amnet Segmental wheel dia 34" Segments per set 16" Table dia and grinding capacity 60" Magnetic table dia (Humphreys) 60" Max height wheel to Magnetic table 18" Minimum height of wheel to table 4.1/2" Spindle speed 450 rpm. Table speeds 16 and 5.1/2 rpm. Automatic feeds 10 rates .004-.040 ins/min. Power elevation 25 ins/min. Spindle motor 60 Hp / 960 rpm 45 kW Table motor 6/2.1/2 HP /1440/480rpm. Feed motor 1/4 Hp / 1440 rpm. Elevation motor 1 Hp / 720 rpm. Coolant pump motor 1 Hp / 1440 rpm. Overall height of machine 10'3". Floor space 13'8" x 10'4". Approx net weight 15 tons.

Year of construction: 1964, condition: excellent (used), Description to follow! Ncedpfx Amoytg U Tonst

Condition: new, functionality: fully functional, Jainnher Machine Co., Ltd. was established in 1982 and is dedicated to developing grinding machine technology, diversity and automation equipment. Jainnher is constantly offering new and improved machinery. The new JAINNHER JHP-4015 CNC Plunge Type machine with FANUC CNC Control. Hydrostatic and Hydrodynamic bearings. Capacity Max ø work swing Ø400 mm Max grinding length 1500mm Max grinding dia. Ø380 mm Max workpiece weight 150 kgs Distance between centres 1500mm Centre height 200mm Grinding wheel Grinding wheel size Ø410 x 50-100 x 203.2mm Max peripheral 33 m/sec Wheel speed 1250rpm Wheel head Feed angle 90 Swivel angle ±0 Rapid traverse speed 6m/min Max. travel 280mm Min. setting unit 0.0001mm Grinding feed rate 0.001~6000m/min Oil Pressure Hydrostatic = 20kg Hydrodynamic = 3kg Tailstock Retraction of quill 30mm Quill diameter 70mm Centre taper MT.4 ( MT.5 option) Hydraulic cylinder pressure 20kg Work head Spindle speed (variable) 10~500rpm/min Centre taper MT.4 ( MT.5 option) Spindle type Telescopic (option Swivel angle 120 (90ºCCW;30ºCW) Work- table Min. setting unit 0.0001mm Swivel angle CCW/CW +7º/-4º Rapid traverse speed 10m/min Max. travel 1500mm Motor Grinding feed rate 0.001~6000mm/min Grinding wheel motor 7.5HP 4P(opt. 10.0HP) 4P Workhead motor 1.5KW Work table (Z axis) 1.8KW Work table (X axis) 1.8KW Hydraulic pump 1/4 HP 4P Wheel head pump Hydrostatic = 2.0HP Ncjdpfx Amsnzib Eonst Hydrodynamic = 1.0HP Coolant pump 1/8 HP 2P Magnetic coolant separator 1/25HP 2P Oil cooler ----- Oil tank Hyd. oil tank(slideways, screw ends & measurement) 60L Wheel head lubrication 50L Coolant tank 160L Machine N.W (Fully enclosed) 8080 kg G.W (Fully enclosed) 8480 kg Dimension (Fully enclosed) 4900 x 2100 x 2000mm Packing (Fully enclosed) 5090 x 2200 x 2200mm

Condition: new, functionality: fully functional, he EUROPA JAINNHER JHV-1008CNC vertical grinding machine is designed for grinding of large components used in the transport, aerospace, power generation, oil & gas, hydraulic and precision components. With a grinding internal diameter range from Ø50 to 800 mm, a maximum outside diameter of Ø1000 mm. The maximum height of the workpiece is 800mm, with a maximum worktable load of 1200 kg. EUROPA Jainnher JHV-1008 CNC Vertical Grinder Capacity Range of I.D. grinding 50 – 800mm Maximum O.D grinding 1000mm Z axis maximum grinding height (OD) 800mm Z axis maximum grinding height (ID) 50 – 250 : 325mm / 250 – 800 : 800mm Maximum swing diameter 1000mm Maximum installed component height 800mm Maximum work table load 1200kg Nedpfxjnzkvhj Amnect Email for latest factory build availability

Condition: new, functionality: fully functional, NEW Rotary table surface grinder available in the UK. With up to a 400mm grinding diameter on this rotary table, vertical spindle surface grinder from Italian manufacturer DELTA, a leading surface grinder manufacturer with over 20,000 units sold worldwide. The rotating table is controlled by asynchronous three-phase bipolar motors with 8/16 poles; thanks to these motors, the table can rotate at a speed of 40 rpm and at a rate of 30 rpm. Delta Rotary surface grinder Maximum grindable surface 400mm Ø Distance between column and wheel axis 315mm Max. distance between magnetic table and wheel 205mm Rapid feed per turn of handwheel 2mm Micrometric feed by small handle 0,01mm Size of cup wheel 200 x 80 x 78mm Ø Size of abrasive segments 50 x 20 x 90mm Motor power of the wheel (4 HP)-3 kW RPM of the wheel (50 Hz) 2840rpm/min Electropump motor power (0,08 HP)-0,06 kW Ncedpfxsnziaks Amnet Mass of the machine 680kg Rotary table surface grinder Standard Equipment Low tension electric system (24V). Cooling system with electropump Wheel-holder flange and grinding wheel. Grinding wheel guard Table guard.- Stakes key Instruction book/testing certificate Two colour painting RAL 5018-7032, bicomponent multicoat of paint CE conformity certificate with respect to the Units Directive CEE 89/392 and subsequent modifications Stock machine complete with Automatic Downfeed control

Year of construction: 1994, condition: used, workpiece diameter 350 mm workpiece weight 99999 kg workpiece height 240 mm total power requirement 7,5 kW weight of the machine ca. 2 t Seltene Gelegenheit: Teilüberholte Hochpräzisions-Rundtischflachschleifmaschine Mit komplett neuem Schaltschrank und neuer Steuerung mit BEMA Schleifsoftware Rundtisch-Durchmesser 380mm Magnet-Durchmesser 350mm Schleifscheibenabmaße 300x25x76,2mm Tischdrehzahl variabel max. 200U/min Schwenkwinkel des Tisches +-3 Grad Schleifspindeldrehzahl 800-4200 U/min Leistung Schleifspindelantrieb 5KW Verfahrweg quer max. 225mm Verfahrweg vertikal max. 480mm Abstand zwischen Magnetspannfutter und Spindelmitte, max. 390mm Automatischer Kopfabrichter AF65: zum zylidrischen Abrichten der Schleifscheibe im CD-Abrichtverfahren (Abrichten während des Schleifprozesses) Hierdurch werden Schleifzeiten reduziert und Abrichtzeiten eingespart. Der Abrichtbetrag wird automatisch kompensiert. Automatische Antasteinrichtung AT-R: bietet die Möglichkeit, mit der Schleifscheibe das Werkstück schnell und automatisch anzufahren. Nsdjxbtl Tepfx Amnect CNC-Steuerung mit höchstem Programmierkomfort Unterschiedliche Schleifprogramme für -Pendelschleifen -Kurzhubschleifen -Einstechschleifen -jeweils eine oder mehrere Flächen in gleicher oder unterschiedlicher Höhe Ins Schleifprogramm integrierte Abrichtzyklen -Tischabrichten mit Einzeldiamant -Automatisch Geradabrichten -CD-Abrichten mit AF65 Minizyklen: -automatisches Antasten an das Werkstück -Positionieren einzelner Achsen -Abrichten Einsatzgebiet: Hochgenaue Planschleifarbeiten in der Mittel- und Großserienproduktion bzw. Einzelteilfertigung in zentrischer Aufspannung

Year of construction: 2015, condition: used, workpiece diameter 300 mm workpiece weight 999 kg workpiece height 145 mm Features: -Digital display vertical axis -Automatic feed -Programmable automatic end stop Ncjdpfoxflclex Amnet -Grinding spindle drive with infinitely variable electronic speed control -Infinitely variable cross feed and table rotation -24V magnetic clamping plate 300 mm -Various occupational safety devices, e.g. protective cover monitoring, operating status display via traffic light -Lubricating oil level monitoring -The machine was completely overhauled in 2015, at which time the entire electrical system was replaced with PLC control and 24V control voltage -Paper belt filter system specially designed for this machine The following work has now been carried out: -Replacement of bellows and belts -New bearings for grinding spindle -Grinding carriage bed and rotary table bed scraped by hand to restore better and more precise running characteristics -Grinding carriage and cross table lifted from machine body and all tracks cleaned, lubrication checked -Various wear parts, such as rubber caps and switching elements, replaced -Detailed functional check -Modernisation of feed arm -Paint touch-up work, machine colour: light grey RAL 7035 and RAL 7012

Condition: repair required (used), Year of construction: 2000, functionality: not functional, machine/vehicle number: 49299, rotary table diameter: 600 mm, grinding height: 400 mm, workpiece weight (max.): 300 kg, grinding diameter: 500 mm, workpiece diameter (max.): 500 mm, TECHNICAL DETAILS Workpiece diameter: 500 mm Nedpfxsxr U T To Amnect Workpiece weight: 300 kg Workpiece height: 400 mm Grinding diameter: 500 mm Grinding height: 400 mm Table load capacity: 300 kg Magnetic rotary table diameter: 600 mm Rotary table speed: 20–80 rpm Y-axis Max. feed rate: 300 mm/min Incremental position measurement system, rotary encoder, resolution: 0.001 mm Z-axis Max. automatic cross travel: 330 mm Cross feed: 4–1,500 mm/min, adjustable Incremental position measurement system, rotary encoder, resolution: 0.001 mm Grinding spindle taper: 60 mm Grinding wheel: 400 x 100 x 127 mm MACHINE DETAILS Total power requirement: 18 kW Grinding spindle drive: 10 kW Space requirement approx.: 2,500 x 2,700 x 2,800 mm Control cabinet dimensions (L x H x D): 1,600 x 2,200 x 500 mm EQUIPMENT Coolant system with paper band filter NK grinding program Electronic handwheel switchable for B-Y-Z axis Machine enclosure with manually operated sliding door for loading and unloading Note: The frequency converter for the grinding spindle is defective. An offer from ELB is available (costs € 3,712.50 + packaging and shipping).

Year of construction: 1964, condition: used, -WKG 429- Offered here is a grinding machine from the company Naxos Union. This is a vertical rotary table surface grinding machine with 2 vertical grinding spindle units. Ncjdpfx Amog Nt Dbjnst Technical data: Manufacturer: Naxos Union Type: FRDA 600/1000 Year of manufacture: 1964 Rotary table: Ø 1100mm grinding wheels Ø: shrink head 475/254 Grinding wheels Ø: finishing head 457/357 Weight: 8t Grinding method: segmental grinding Segment grinding heads: 2 pieces Accessories: Dressing device Water box with paper belt filter Marposs control

Condition: used, Year of construction: 1980, workpiece diameter 600 mm workpiece weight 400 kg Nedjt Abrwspfx Amnjct workpiece height 300 mm total power requirement 35 kW weight of the machine ca. 4500 kg

Condition: used, Year of construction: 1969, rotary table diameter 1000 mm grinding height 500 mm grinding head - power requirement 15/5,5 kW total power requirement 30 kW weight of the machine ca. 18 t dimensions of the machine ca. m S I E L E M A N N (Germany) Hydraulic Rotary Table Internal and Face Grinding Machine with two grinding heads and with horizontal workpiece clamping Model RFsB 100 Year 1969 / fully reconditioned by the manufacturer in 1990 _____ Max workpiece Ø 1,000 mm Max. height of workpiece, approx. 400 mm Mounting height under grinding spindles approx. 500 mm Grindable Bore Ø, approx. 50 – 900 mm Max. Workpiece weight approx.. 900 kg Distance between Table bore and column 1.150 mm Table Ø / Face plate Ø, approx. 1,000 mm Table speeds, hydraulic, infinitely variable, right/left 5 – 60 rpm Table/workpiece infeed, 5 steps 0.0025 – 0.025 mm/stroke Table stroke approx. 500 mm Distance between grinding spindle and machine body 600 mm Surface Grinding Head Ø (Segmented wheel) 450 mm Grinding slides stroke, max. 500 mm Grinding slide speeds, infinitely variable 0.2 – 1 m/m Ncodpeu Su Apjfx Amnst Max. Internal Grinding spindle Ø 140/100 mm Grinding cup wheel Ø, up to approx. 200 mm Motor for Surface Grinding 15 kW / Motor for Internal Grinding Spindle 5,5 kW Total electrical load, approx. 30 kW - 380 V - 50 Hz Weight, approx. 18,000 kg Accessories / Special Features • The rotary table carries the workpiece and is also actuating the automatic grinding infeed • The relevant Grinding head can be swivelled in by turning the Column (hydraulic lift) so the workpieces can be ground in one setting with exact angles. • Built-on magnetic face plate, Ø approx. 1,000 mm, with 5 T-slots and stepless adjustment for the magnetism • Automatic workpiece infeed, with automatic depth stop. • Separate Height adjustment of internal grinding head, Grinding spindle Ø 100 mm. • Dressing devices mounted on each grinding head, Separate Switch Cabinet and hydraulic unit, • No Coolant Device available This machine is ideal for grinding bulky and heavy workpieces like housings, gears (!) bearing rings, cylindrical knives, etc. Condition: Good. Machine can be inspected soon under power Delivery : Ex stock as inspected. Payment : Net, after conclusion of contract.

Condition: good (used), Rotary Table Surface Grinding Machine ARTER A3 - 16 - Max. grinding diameter: 450 mm - Grinding height: approx. 220 mm - Workpiece weight: approx. 250 kg - Automatic feeds - Coolant system - Machine enclosure - Work light Dimensions: LxWxH 2.5x1.5x1.7 meters / Weight 3500 kg Nedpfxjyc Hkyj Amnjct Subject to errors and typos.

Year of construction: 1987, condition: used, Kehren rotary table type RS 7C, second-hand manufacturer: Kehren, Honneff Comm.: 4179 Ncjdpfx Ajhgmwgemnjt year of construction: 1987 Control: Siemens 3G SPS: Siemens S5 grinding motor: BBC QUB 200 rotary table ø: 750 mm ø grinding head:460 mm Control panel with screen Coolant system Flushing pump Coolant pump Automatic paper belt filter system Control cabinet

Condition: ready for operation (used), Year of construction: 1996, functionality: fully functional, rotary table diameter: 1,000 mm, grinding height: 500 mm, table diameter: 1,000 mm, CNC rotary table grinding machine with 1000 mm magnetic chuck, turret carrier with 3 grinding spindles (external, face, and internal grinding spindle). CNC control Sinumerik 840C, Simodrive 611 drives, coolant tank, currently still in operation, now being dismantled. Delivery also possible as overhauled and with new electrics upon agreement. Total weight 20,000 kg. Nsdpfx Amewv Sc Asnoct

Condition: ready for operation (used), Year of construction: 1995, functionality: fully functional, machine/vehicle number: 4304, rotary table diameter: 600 mm, grinding height: 450 mm, overall weight: 14,500 kg, Machine is equipped with 3 spindles, surface grinding, external grinding, bore grinding Turret head B-axis with 1° division Belt filter system included Njdpfjvt A Rtjx Amnoct

Condition: new, Year of construction: 2026, Grinding area 1000 x 450 mm, rotary table diameter 1000 mm, grinding wheel 400 x 100 x 127 mm, spindle power 11 kW incl. speed control, electro-permanent magnetic chuck diameter 1000 mm with holding force adjustment, automatic dresser mounted on spindle housing incl. dressing amount compensation, coolant system with paper band filter, user-friendly operation with Mitsubishi PLC control, alternatively SIEMENS 828 CNC control, new machine with 12-month warranty, highest precision at an unbeatable price/performance ratio. Grinding tests can be performed on our exhibition machine. We provide installation and training at your site, as well as future service support. Financing/leasing available, please contact us for an offer! Njdpsh I Tz Sofx Amnoct

Condition: refurbished (used), TECHNICAL SPECIFICATIONS Rotary table diameter: 600 mm Magnetic plate diameter: 600 mm Segment holder (or diamond grinding wheel) diameter: 430 mm Maximum grinding height: 400 mm Table rotation speed, continuously adjustable: 1-20 rpm Vertical automatic increments: 0.001 mm Spindle motor power: 37 kW Grinding spindle speed, continuously adjustable: 500-1000 rpm Ncsdox N I A Sjpfx Amnjt Maximum load on table: 900 kg Net machine weight: approx. 7500 kg Power supply: 400 V +/- 5% 3 Phases, 50 Hz Control circuit voltage = 24 V DC TECHNICAL DESCRIPTION • Frame and uprights made of electro-welded, thermally stabilized steel, with high rigidity and reinforcing ribs. Vertical movement of the spindle head • Precision linear slides • Vertical movements of the grinding wheel head via high-precision ball screws + YASKAWA brushless shaft motor • Vertical movements of the grinding wheel head via electronic handwheel. • Minimum programmable value = 0.001 mm. • Display showing the vertical position of the grinding wheel head, 0.001 mm resolution Transverse movement of the rotary table • Precision linear slides • Transverse movement of the rotary table via high-precision ball screws + YASKAWA brushless shaft motor. • Transverse table movements via electronic handwheel. • Minimum programmable value = 0.001 mm. • Display showing the vertical position of the grinding wheel headstock, 0.001 mm resolution. Spindle Motor • Coaxial spindle with drive motor • Balanced 37 kW spindle motor, without drive belt or coupling. • Frequency converter for continuously variable spindle speed and rapid braking of the spindle motor at the end of the cycle. Rotary Table • Cast iron rotary table with hydrostatic slides. • Drive via Siemens brushless motor • Continuously adjustable table speed from 1 to 20 rpm STANDARD EQUIPMENT • Electropermanent magnetic chuck, 600 mm diameter with parallel poles, complete with electronic control and attraction force adjustment • Electronic handwheel for manual movement of the vertical and transverse axes. • LODI CNC Type T 2000 • Encoder-based measuring system for the vertical and transverse axes. Resolution = 0.001 mm • Automatic cycle with different feed rates for the various cycle phases: roughing, finishing, and sparking. • Cast iron rotary table with hydrostatic slides • Rotary table speed continuously adjustable by brushless motor • Frequency converter for continuous spindle speed adjustment and rapid spindle motor braking. • Coolant system with external collection tray. • External lubrication unit for automatic lubrication of all moving parts. • Complete segment holder (flange) with a set of segments + grinding wheel holder for diamond grinding wheel • Complete work area enclosure with sliding door • Work lights • Set of service wrenches • Documentation in French (1x printed, 1x on DVD) • CE Certificate Lubrication • External lubrication system for lubricating all moving parts. Watering System • Watering system including protective plates and hoses, including a settling tank outside the machine (without filter) Enclosure • Full enclosure with manually operated sliding door CNC Control LODI T2000 type CNC for managing and controlling the machine's axis movements. Automatic work cycle for grinding parts.