RTM 270/B - Berco S.p.A

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RTM 270/B - 1300 - 1600 - 20001 Lever and knob foradjustment of the belts.2 Headstock spindle rotationcontrol lever, 3-position: start,neutral, braking.3 Faceplate lock pin controlknob.4 Table traverse handwheel.5 Lever for fast traversing thetable in either direction,equipped withelectromechanical safetydevice against unintentionalmaneuvers.6 One-shot pump for table feedgearing lubrication.7 Wheelhead micrometer feedcontrol unit, for plunge grinding.8 Pedal control to actuatefaceplate lock pins.9 Hydraulic wheel dresser:opening and shutoff of coolantas well as automatic return ofthe diamond slide areautomatic.10 Levers for shifting andlocking the tailstock quill.11 Signal light fixture forjournal lineup.12 Hydralic steady rest withmechanical lock, in workingposition.13 Wheelhead traverse controllever, 2-positions: fast return,slow and fast approach.14 Wheelhead infeed controlhandwheel.15 Centralized, low-tensionelectric controls box, with mainswitch which can be blockedvia a padlock.16 Hydraulic pedal control foractuating tailstock quillretraction.Figg. 2,3Diagrams showing, respectively,top roundness and surface finishdegree obtainable with the RTM270.Fig. 2 Fig. 391011121231341451567816Fig. 1General view of the machine in the “B” execution, the most complete because of specific devices and automatics.
Fig. 4Workhead where the fo u rm ovements stand out in full re l i e f .Fig. 5Workhead equipped with 180 mm( 7 3 /3 2”) dia. selfcentering chuck.Fig. 6Workhead equipped with drivingcollar and center with ring nut.Fig. 4 Fig. 5 Fig. 6The Berco RTM 270 is acrankshaft grinder which hasbeen designed to meet themanifold requirements of thosepeople who must handle bothunit and production regrindingof small and medium runs ofcrankshafts.If view of this, the RTM 270has been realized in threedifferent executions, each onehaving trhee different distancesbetween centers.Execution “A”It is the simplest execution andcan thus be regarded to as thebasic execution.No automatics are provided forin the standard outfit of thismachine, the machine beingsuitable only for regrinding ofcrankshafts with differentdimensions and specifications.Execution “B”It is the most completeexecution, being featured byspecific devices andautomatics which allowprofitable and timesavingregrinding of small andmedium runs of crankshafts.Execution “D”Essentially similar to the “A”execution, it is furthermoreequipped with a unit foractuating table traverse andreverse thus allowing cylindricalgrinding.The customer will thus be ableto choose, out of theseexecutions, the one whichbetter suits his specificrequirements and add theseveral optionals available inthe extra outfit.Other techincal and costructionfeatures of the RTM 270 areset forth hereunder:• Self-locking counterweights,radially adjustable andprotected by safety guards incompliance with the accidentprevention regulations.• Drive via high-resistance,high-flexible cogged belts, toassure an even and surgingfreerotation of workpiece.• Clutch located direct on themain spindle, to obtain fastand precise balancing of massin rotation.• Air-float headstock andtailstock.• Tailstock quill with 50 mm(1 31 /32”) travel, to make loadingand unloading of thecrankshafts easier and faster.• Workheads with fourmovements:- radial movement- cross movement- 360° rotary motion, with fastindexing for 2, 3, 4, 5 and 6cylinder engine crankshafts- micrometer swing movement.All versions can be suppliedalso with stepless variablespeed workhead motor.
Page 1: RTM 270Crankshaft grinderA Companyo
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Page 7 and 8: Fig. 9 Fig. 10Fig. 9Rear view of ta
Page 9 and 10: Fig. 15 Fig. 16Plunge feed device f
Page 11 and 12: Fig. 20 Fig. 21Fig. 22Fig. 23Fig. 1
Page 13 and 14: Fig. 28Fig. 24Grinding a center wit
Page 15 and 16: Others crankshaft grinders of the R

RTM 270/B - Berco S.p.A

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