Cincinnati No. 220-8 Mdl. RK, centerless grinder, 4.5" diameter work capacity, 24" diameter & 14" wheels capacity, 20 HP, 1993

#220-8 RK Cincinnati Centerless Grinder, Attached Electrics, Heidenhain Scales, SBS Wheel Balancer with Model 2500 Controller, 24"x10" Grinding Wheel, As Is
220-8 RKCINCINNATI CENTERLESS GRINDER
S/N9163A0193-0004 Year: 1993
STANDARD SPECIFICATIONS
Work Capacity
Maximum work piece diameter……………………………….. 4.5
Minimum work piece diameter……………………………….. 0.060
Grinding Wheel
Maximum new wheel diameter……………………………….. 24
Minimum worn wheel diameter………………………………. 17
Maximum wheel width……………………………………….. 10
Wheel mounting hole diameter……………………………….. 12
Grinding Wheel Speed
Surface speed…………………………………………………. 8500 ft/min. @ 1352 RPM
(Maximum diameter wheel)
Optional surface speed……………………………………….. 6500 ft/min @1034RPM
(Maximum diameter wheel)
GrindingWheel DriveMotor
256T Frame – 1800 RPM……………………………………. 20 HP
Drive belts……………………………………………………. 3V850
Grinding Wheel Dresser
Traverse dive motor (Servo)……………………………………….. 1.2 N-m
Worm gear reducer ratio…………………………………………… 10:1
Traverse rate (across wheel)……………………………………….. 1 to 50 IPM
Traverse rate (across wheel)...…………………………………….. 25, 4 to1270mm/min.
Maximum traverse distance (across wheel)………………………. 12.28
Maximum profile depth…………………………………………… 1
Diamond holder – single point type………………………………..0.437Shank
Blade type diamond holder………………………………………… Optional
Hydraulic rotary cutter...…………………………………………… Optional
Auto diamond compensator...……………………………………… 0.0005Division
Optional electric solenoid comp…………………………………….0.0005Resolution
Maximum compensation w/electric solenoid………………………. 0.0015
Regulating Wheel
Maximum new wheel diameter…………………………………….. 14
Minimum worn wheel diameter……………………………………. 11
Mounting hold diameter……………………………………………. 6
Maximum width (without cobore)….………………………………. 8
Maximum width (with cobore)…………………………………….. 10
Maximum RPM (during dressing)…………………………………. 300 RPM
Minimum RPM…………………………………………………….. 0 RPM
Surface speed………………………………………………………. 0 to 1100 ft/min.
Surface speed………………………………………………………. 0 to 335, 4 m/min.
Drive motor (Servo)……………………………………………….. 14 N-m
Drive ratio………………………….………………………………. 8.333:1
Regulating wheel housing swivel (work feed angle)….…………… 8' to-2'
Regulating Wheel Dresser
Traverse drive motor (Servo)…………………………………………. 1.2 N-m
Worm gear reducer ratio……………………………………………… 10:1
Traverse rate (across wheel)…………….…………………………….. 0 to 50 IPM
Traverse rate (across wheel)……………….………………………….. 0 to 1270mm/min.
Maximum traverse distance…………………………………………... 11.02
Maximum profile depth………………………………………………. .63
Diamond holder – single point….…………………………………….. 0.437ShankDia.
Diamond compensator
Auto advance dial……………….……………………………………. 0.0005Division
Electric solenoid (optional)……….…….…………………………….. 0.0005
Dresser swivel……………………….……………………………….. 8' to -2'
SingleAxis Slide Drive
Re-circulating ball screw……………………………………………. 10mm Pitch
Compensator resolution……………………………………………... 0.000004
Positioning rate (maximum)…………...……………………………. 125 min.
Infeed
Rapid advance/retract rate………………………………………….. 125 min.
Number of feed rates……………………………………………….. 3
Maximum feed rate (rough rate)……………………………………. 1 min.
Minimum feed rate (rough rate)……………………………………. .001min.
Maximum feed rate (medium rate)…………………………………. 1 min.
Minimum feed rate (medium rate)………………………………….. .001min.
Maximum feed rate (fine rate)…………………………………….... .1min.
Minimum feed rate (fine rate)……………………………………… .0001min.
Swivel Plate
Swivel to front (measured to adjustor)……………………………….. 0.50
Swivel to rear (measured to adjustor)………………………………… 0.50
Lower Slide
Maximum travel……………………………………………………… 9.05
Slide clamps (2)………………………………………………………. Manual
Upper Slide
Maximum travel……………………………………………………… 5.27
Slide clamps (2)……………………………………………………… Manual
Hydraulic System
Reservoir capacity…………………………………………………… 20 gal.
Oil specification……………………………………………………… CM P-38
Viscosity (S.U.S. @ 100' F)………………………………………….. 149 to 182
ISO viscosity grade……………………………………………………. ISO VG 32
Military spec. equivalent.………………………………… MIL-H-46001A Type 1
Pump capacity……………………………………………………….. 4.3 gal per min.
Pump motor…………………………………………………………. 1.5 HP – 1800 RPM
Frame…………………………………………………….. 145TC, Nema C FaceMount
Pressure filter…………………………………………….. Throw-Away Type Element
Bypass pressure……………………………………………………… 50 PSI
Schroeder replacement element……………………………………… 8TS3
Main system pressure………………………………………………… 250 PSI
Lubrication System
Reservoir capacity……………………………………………… .5 gal.
Oil specification………………………………………………… CM P-47
Viscosity (S.S.U. @ 100' F)……………………………………. 317 to 389
ISO viscosity grade……………………………………………… ISO VG 68
Military specification equivalent……………………….. MIL-L-46017Type 1Medium
System pressure………………………………………………….. 150 PSI
Lubrication cycle frequency…………………………… 15 seconds every 4hours
System type – positive displacement
Distributor points – grinding wheel dresser, regulating wheel dresser
Lubrication oil is also supplied at a constant pressure to the regulating wheel spindle bearings and drive unit by the hydraulic power unit.
Lubrication cycle frequency and points lubricated may vary due to optional/special equipment supplied.
Cutting Fluid System
Standard system…………….…………………………………… Hydrant and Sewer
Optional system…………………….…………………………… Pump and Tank
Tank capacity……………………………………………………. 150 gal.
Pump capacity (flow)……………………………………………. 40 gal. per min.
Pump motor……………………………………………………… 2 HP
Optional filter system……………………………………………. Barnes Drill MPE-25
Machine Weight
220-8 Centerless Grinder…………………………………….. 22,102 lbs.
Unit Weights(All weights are approximate)
Base…………………………………………………………… 7,280 lbs.
Wheel head……………………………………………………. 1,575 lbs.
Upper slide…………………………………………………….. 875 lbs.
Lower slide…………………………………………………….. 1,038 lbs.
Swivel plate……………………………………………………. 1,780 lbs.
Regulating wheel housing……………………………………… 627 lbs.
Regulating wheel drive unit w/o motor………………………… 158 lbs.
Regulating wheel drive motor………………………………….. 128 lbs.
Regulating wheel truing assembly……………………………… 900 lbs.
Regulating wheel housing w/motor…………………………….. 975 lbs.
Grinding wheel truing assembly………………………………... 655 lbs.
Regulating wheel housing w/motor…………………………….. 1,050 lbs.
Coolant tank – full (150 gal.)…………………………………… 1,600 lbs.
Coolant tank – empty……………………………………………. 300 lbs.
Tank – full (118 gal.)……………………………………………. 1,390 lbs.
Tank – empty……………………………………………………. 400 lbs.
Unit Weights(All weights are approximate)(continued)
Wheel guard……………………………………………………… 440 lbs.
Wheel guard door……….……………………………………….. 130 lbs.
Single axis slide drive w/ball screw……………………………… 640 lbs.
Hydraulic tank assy. (empty)…………………………………….. 565 lbs.
Drive box w/o motor…………………………………………….. 158 lbs.
Drive box motor…………………………………………………. 128 lbs.
Specifications are deemed accurate, however, subject to verification or prior sale.
All exchange units/returns must be shipped within 30 days. All exchange units/returns must be shipped using DDP terms - Grinders Clearing House, Inc. dba GCH Machinery, is not responsible for any customs formalities or shipping costs.
If Grinders Clearing House, Inc. dba GCH Machinery does not receive exchange/core unit back within30 days, GCH will invoice FULL replacement cost (OUTRIGHT Cost) to customer.

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