6" X 18" ACRA MODEL 618AH SEMI-AUTOMATIC 2 AXIS PRECISION SURFACE GRINDER

Rigid Construction:
• All main elements are made of “Meehanite GC275” castings which had been annealed stress relieved for long lasting accuracy and stability. Rib reinforced box type construction of main parts ensure high rigidity.

High Precision:
• Vee and flat ways for longitudinal movement and double vee ways for cross movement. Both longitudinal and crossmating ways are lined with “Turcite B” and precision hand scraped to provide high accuracy and eliminate stick slip.

Automatic Lubrication System:
• The lubrication pump works as soon as the power is switched on. Lubrication system continuously lubricates ways, vertical lead screw and its bearings and gears.

Slot Grinding Capability:
• The saddle lock feature and precision cross feed ball screw allow for grinding of slots with highest performance without vibration .

Anti-Dust and Water Proof Design:
• All ways and electric cabinet are well protected free from dust and water to ensure consistent accuracy life.
Table Hydraulic Feed:
• Speed range from 1m/min to 25m/min (3 fpm ~ 83 fpm) provides easy operation of the machine. Stroke is adjustable by a pair of dogs in front of table.

Non-contact proximity switches are used.

Automatic Cross Feed:
• A combination of precision ball screw and an electric motor driving system provides quick, smooth automatic cross feed.

Super Precision:
• Consistent temperature control unit (room temperature ± 1.2 degrees Celsuis) for hydraulic system is provided as an option for preventing thermal distortion of the machine when super precision is required.

Advance Hydraulic Circuit Design:
• Improved Hydraulic Circuit provides vibration-free reversing motion of the table, easier to move table by hand wheel when table hydraulic feed is switched off. External, Independent Hydraulic tank provided with no heat transferred to the base.
• Big volume drain device installed externally for easy accessing and cleaning.
• Rib reinforced box type base, with enlarged double Vee ways to ensure the best foundation of accuracy.
• Delicate saddle clamping device is provided for shoulder and slot grinding.
• Non-contact proximity switches and dogs for cross feed stroke adjustment.
• Cartridge type spindle unit with precision bearings class ABEC7(P4) and direct drive motor (V3 vibration class).
• Precision hand scraped wheel head unit and its ways with continuous lubrication.


Specifications:
Capacity:
     Maximum Grinding (Length x Width):                              20” x 6”
     Maximum Distance from Table Top to Spindle:               15-3/4″
     Table Surface (Length x Width) Inch:                               18.3” x 6”
     Center Height:                                                                  15-3/4″
Table:
     Maximum Longitudinal Travel:                                         21 .6” 
     Maximum Cross Travel:                                                    6.9”
     T-slot Width (No. x Width):                                             1 x 0.67”
Longitudinal Movement of Table:
     Hydraulic Feed ft(m):                                                       3.28’ ~ 82”
     Hand Feed per Revolution:                                              2.71”
Cross Movement of Saddle:
     Intermittent Feed:                                                             0.006” – 0.394”/min
     Continuous Feed:                                                              47.2”/min
     Hand Feed per Revolution:                                                0.2”
     Graduation of Hand Wheel:                                               0.001”
Vertical Movement of Wheel Head:
     Hand Feed per Revolution:                                                0.04”
     Graduation of Handwheel:                                                 0.00025”
Feed:
     Micro Feed (OPTION):                                                        0.00005”
     Rapid Feed. (OPTION):                                                       8.6”/min
Spindle:
     Spindle Motor Horsepower:                                               2 HP/2P
     Spindle Speed (60Hz):                                                        3,450 rpm
     Grinding Wheel (Diameter x Width x Bore):                       8’x 0.5’x1.25″
Motor:
     Hydraulic Motor:                                                                 2 HP/4P
     Cross Feed Motor:                                                               25W
Voltage:                                                                                    230/460V AC~3 PH
Weight                                                                                     2100 lbs


Standard Equipment:
• Grinding Wheel
• Diamond Wheel Dresser
• Kanetsu 618 Permanent Magnetic Chuck
• Wheel Balancing Arbor
• Leveling Screws & Plates
• Automatic Lubrication
• Wheel Flange
• Halogen Light
• Table Hydraulic Feed