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8" x 20" Okamoto #820N, surface grinder, 3-Axis power feed, incremental downfeed, electromagnetic chuck, stone dresser, digital read out

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General Specifications

Width/Cross: 8.0"
Length/Longit.: 20.0"
Manufacturer: Okamoto
Model: 820N
Stock #: G8025-10502
Price: Request a Price

Dealer Information

Century Machinery Co
1937 S Santa Fe Ave
Los Angeles, CA 90021-2917

Contact: Leon Dietch
Tel: 213-627-2847
Fax: 213-627-2499

Gold Level Dealer Since 1968

View our Equipment Listings

Detailed Product Description

OKAMOTO SURFACE GRINDER Model 820N Type Reciprocating Table
Serial Number 2101

CHUCK: Walker Electro-Magnetic,       8" W x 20" L(203.2 x 508mm)
TABLE: (1) T-Slot, Working Surface Pad length: 29½" (749.3mm)
Longitudinal Movement of Table Infinitely Variable thru 25.59"
Transverse (Cross) Movement 9.05" (229.87mm)
Longitudinal movement per Revolution by: Hand 1.85" / Hydraulic
(Automatic) 1-83 FPM
Cross (Transverse) movement 9.05" by: Hand Feed Per Revolution 0.2" to
0.47" (5.08 x 11.94mm)
Continuous Cross Feed Per Minute 4 – 40 IPM (101.6 – 1,016 m/mm)
Maximum distance under 8" diameter wheel to Table Surface 15.6"
GRINDING WHEEL: 8" dia. x 1" Face x Bore 1¼" (203.2 x 25.4 x 31/75mm)
GRINDING WHEEL ASSEMBLY: Movement by Hand and Automatic with Incremental
Automatic Down Feed Per Table Stroke (OPT) 0.0001 - .0015"
Automatic Downfeed per Table Reversal 0.0001 – 0.0015".
Graduation of handwheel 0.002"
Vertical Fine Feed (Manual): 0.0001" to 0.0015", Hand feed per Revolution 0.00001"
SPECIFICATIONS: Vertical Rapid Feed 19 IPM (482.6m/mm)
MOTOR DRIVES: Machine Wired 460 volts
Spindle 3 hp (2.2 kw) 230/460 volts
Hydraulic Pump 0.054hp (.04 kw) 230/460 volts
Down Feed 1.5 hp (1.1 kw) 230/460 volts
Coolant Pump      ¼ H.P. 230/460 volts
CONTROLS: Wheel Start Button. Hydraulic Pump Start Buttons.
Emergency Stop Button. Auto Down Feed Switch. Cross Feed Direction Switch.
Rapid Feed Up / Down Buttons. Coolant On / Off Switch
Table Feed Switch. Table Stop Button EMERGENCY STOP Button.
CONTROLS ON GRINDER: Table Speed Adjustment. Cross Feed Control.
Step Feed Control. Magnetic Chuck Control
1- Grinding Wheel Hubs. Stone Dresser (Built on) w/ Manual adjustment
down, cross movement handle.
1- Diamond Nib for dresser. DRO, Sony two Axis Vertical Wheel
| Assembly & Table Knee Cross Feed.
Walker Magnetic Chuck Control.
Automatic Lubrication. Coolant Pump. Splash Guards
Floor Space 84½" R-L x 58" F-B x 72" Ht. Approx. weight 3,500 lbs.
(2,146.3 R-L x 1,473.2 F-B x 1,828.8mm Ht.