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Palmary PC-12 Centerless Grinder

Item #: PC-12 Centerless Grinder

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Palmary PC-12 Centerless Grinder

  • 1. Rigid Machine Structure
  • (1) The machine structure is manufactured from high quality Meehanite cast iron, heat treated and stress relieved before machining.
  • (2) Slideways are high frequency hardened and precision ground. Maximum material stability for deformation-free and outstanding wear resistance.
  • 2. Precision Spindles
  • (1) The grinding wheel spindle and the regulating wheel spindle are precision machined from Nickel Chromolybedenum alloy steel (SNCM-220). Also, they are subject to various treatments such as: normalized, tempered and carburized hardening. Then, the spindles are thru sub-zero treated – under zero degrees, precision ground and precision machined.
  • (2) The inside of spindle is tempered to hardness HRC 25°~30°, while surface hardness reaches over HRC 62. The precision ground spindle is excellent for heavy-duty machining and features powerful torque, long service life, deformation-free and maximum wear resistance.
  • 3. Slide Table
  • (1) Upper slide swiveling is easy and accurate to adjust for making the machine suitable for infeeding grinding. Also, it allows grinding for a varied diameter of workpieces. The Upper slide with +5°~-5° swiveling allows taper grinding by using infeed grinding mode.
  • (2) With thrufeed grinding, the Upper slide provides a surface contact adjustment between the workpiece and grinding wheel. Swiveling adjustment range is +5°~-3°.
  • (3) Dovetailed slideway on the upper slide features smooth and accurate feeding and is lubricated by a centralized lubricator.
  • (4) The bottom slide moves on “Λ” shaped and double-wedged ways.
  • The slideways are hardened and precision ground. They feature smooth movement and properly protected to prevent dust from entering. Micrometric feed adjustment unit is 0.001 mm to meet high accuracy requirements for all workpieces.

Controls: Fanuc or Mitsubishi



Grinding Wheel


Standard grinding range (Dia.)

Ø1~Ø40 mm

Capacity increases with special arrangement

Ø30~Ø60 mm

Grinding wheel size (O.D. x width x I.D.)

Ø305 x 150 x Ø120

Grinding wheel speed

1900 R.P.M.

Grinding wheel motor

7-1/2 HP x 4P

Regulating Wheel


Regulating wheel size (O.D. x width x I.D.)

Ø205 x 150 x Ø90

Regulating wheel speed

20 ~ 337 R.P.M. (10 Steps)

Regulating wheel motor

1HP x 6P

Regulating wheel tilt angle

+5° ~ -3°

Regulating wheel swivel angle


Handwheel Graduation


Upper slide feed graduation

4 mm/rev.   0.025 mm/graduation

Upper slide micro-feed graduation

0.1 mm/rev.   0.001 mm/graduation

Lower slide feed graduation

7 mm/rev.  0.05 mm/graduation

Lower slide micro-feed graduation

0.2 mm/rev.  0.001 mm/graduation

Trimming device graduation

1.25 mm/rev.   0.01 mm/graduation

Drive Motors


Hydraulic pump motor

1 HP x 4P

Coolant pump motor

1/8 HP x 2P

Machine Dimensions


Machine Dimensions

1750 x 1050 x 1400 mm

Net weight

1650 kg

Gross weight

1900 kg

Standard Accessories:

1. Regulating wheel and flange (1 set) (mounted on machine)
2. Grinding wheel and flange (1 set) (mounted on machine)
3. Infeed work rest and carbide blade (1 set)
4. Thrufeed work rest and carbide blade (1 set)
5. Standard electric equipment (1 set) (mounted on machine)
6. Oil tank (1 set) (ind. Oil cooling fan)
7. Standard coolant system (1 set)
8. Diamond tools (2 pcs) (mounted on machine)
9. Work lamp (1 set) (mounted on machine)
10. Tool box and Tools (1 set)

Optional Accessories:

1. Wheel balancing stand and arbor
2. Automatic infeed attachment
3. Manual feeder for infeed grinding (up and down)
4. Hydraulic work ejector (infeed grinding)
5. Automatic loading attachment (thrufeed grinding) (Ø5-20 mm, L100-600 mm)
6. Automatic feeder for thrufeed grinding (hopper type) (Ø2-8 mm, L50-180 mm)
7. Automatic unloading attachment (thrufeed grinding)
8. V Type Supporter for long bar grinding
9. Profile grinding attachment
10. Magnetic coolant separator
11. Magnetic with paper filter
12. Hydrocyclone coolant separator
13. Auto. Loading and unloading attachment (infeed grinding)
14. Vibratory feeder (thrufeed grinding)
15. Large work rest (thrufeed grinding) L:250 – 500 mm