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Palmary GU20x40NC Cylindrical Grinder

Item #: GU20x40NC Cylindrical Grinder

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Palmary GU20x40NC Cylindrical Grinder

  • 1 Stable and Rigid Spindle Head
  • (1) The spindle runs on precision bearings, assuring maximum spindle stability. It guarantees outstanding accuracy for external and internal diameter grinding and face grinding.
  • (2)The spindle head swivels +90°~-30°.
  • (3)The spindle head on the 20 series machines provides variable speed changed by frequency inverter.
  • (4)The spindle head on the 32 and 42 series is driven by servomotor, providing variable speed.
  • 2 Precision Wheel Head
  • (1) The grinding wheel spindle is precision machined from high quality alloy steel SNCM-220, normalized, tempered, carburized and sub-zero treated, precision ground and mirror-effect treated. Hardness reaches to over HRC 62°. No deformation, maximum wear resistance and lifetime accuracy are assured.
  • 3. Special Hydrostatic Bearing
  • (1) The wheel spindle runs by using a special hydrostatic bearing and is especially ideal for precision grinding work. It features high speed, no friction between metals, no heat generation, deformation-free, extra high accuracy and continual use.
  • 4. Advanced Hydrostatic Lubrication System
  • (1) The slideways of the table and the wheel head are lubricated by an advanced automatic hydrostatical lubrication system. This provides various features, such as extremely smooth movement, added feed accuracy and superior grinding accuracy.

Controls: Mitsubishi


GU20 x 40NC



Distance Between Centers

400 mm

Swivel Over Table

200 mm

Max.Load of Centers

60 kg

Max. External Grinding Diameter

160 mm

Wheel Head


Swivel Angle


Manual Distance

135 mm

Auto Rapid Advance

25 mm

Sliding Seat Supplementary Displacement

95 (total 255 mm)

Min. Setting Unit

0.001 mm

One Turn of Handwheel (graduation)

2 (0.005) mm

NC Feed Range

0 ~ 99 mm

Grinding Wheel


O.D x Width x I.D

305 x 38 x 127

Speeds (belt-type) r.p.m

2085 / 2495

Work Spindle Head


Swivel Angle

120° (+90° , -30°)

Center Taper

MT : 3

Spindle Speeds (variable) .r.p.m

16 ~ 450

Max. Load of Spindle (tool holder included)

15 kg (Max length : 100 mm)



Center Taper



20 mm



Swivel Angle

-3°, +12°

Traverse Speed

50 ~ 4000 mm/min

Auto. Reciprocate Min. Stroke

8 mm

Feed of One Turn of Handwheel (2-step)

20 mm (2mm)



Wheel Spindle

2.1 kw (4P)

Workhead Spindle

0.75 kw (4P) (Inverter)

Hydraulic Pump

0.75 kw (6P)

Wheel Spindle Lubrication Pump

0.18 kw (2P)

Coolant Pump

0.18 kw (2P)

Internal Grinding Spindle

0.375 kw (2P)

Tank Capacity


Wheel Spindle Lubricant Tank

12 L

Hydraulic Fluid Tank

65 L

Coolant Tank

100 L

Machine Weight



2000 kg

Standard Accessories:

1. Grinding Wheel and Flange (1 set)
2. Diamond Tool Holder (Table mounted type) (1 pc)
3. Tool and Kits (1 set)
4. Carbide Tipped Work Centers (2 pcs)
5. Coolant Equipment (1 set)
6. Hydraulic Pump with Tank (1 set)
7. Work Lamp (1 pc)

Optional Accessories:

1. Internal grinding attachment (including 3-jaw chuck and one spindle)
2. Diamond tool holder for internal and external grinding wheel dressing (upward open type)
3. Diamond tool holder (Tailstock mounted type)
4. Diamond tool holder for internal and external grinding wheel dressing (sideward open type)
5. Angle trimming device
6. Radius trimming device
7. Cam locked driving dogs (6 pcs/set)
8. Work steady rest (2 pcs/set)
9. 2-point steady rest
10. 3-point steady rest
11. Adjustable 3-jaw scroll chuck
12. Adjustable 4-jaw scroll chuck
13. Magnetic coolant separator
14. Magnetic with paper filter
15. Wheel forming device for NC model (Manual No auto. compensation)
16. Wheel forming device for NC model (Auto. Compensation)
17. Wheel balancing stand and arbor