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Last Updated: 9/22/2005
© 1996~2005
Gromax Enterprises Corp.
All Right Reserved.

• PRICES, SPECIFICATIONS, AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE.


Grinder/Drill Sharpener

Grinding Wheel

Grinding Accessories

Suburban Tool

 

GROMAX>Grinder>Centerless Grinder
 

| surface grinder | cylindrical grinder | rotary type surface grinder |
| centerless grinder | cutter & tool grinder/drill sharpener | pin cut-off machine |

Centerless Grinder

RC Series GROMAX Centerless Grinder
C12/C20
GROMAX Centerless Grinder

 

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GROMAX Centerless Grinder  

Economical Series!
RC Series are general purpose centerless grinding machines intended for rapid, accurate grinding of small diameter work. High quality at low cost is one of the outstanding features. They are high-productive, versatile, durable machines with maximum ease of operation and safety design.

RC-12

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More Information
RC-16

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More Information
RC-18

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More Information
 
 
RC-1810/1812

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More Information
RC-20

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More Information

Features:

Machine Bed: The machine bed is made of high quality "MEEHANITE" cast iron and has aging treatment. No distortion. Machine bed and slides are also heat treatment and precision ground. No worn out.
Gear Box: All gears are made of SNCM220 alloy steel having been normalized, carburized hardened and precision ground. No vibration and low noice.
Servo Motor for Regulating Wheel: Japanese servo motor is used as the regulating wheel motor which provides infinitely variable speed change from 0~295rpm and can be adjusted to ideal linear speed. The servo motor is driven directly by worm and worm gear. This can reduce vibration during grinding and consequently achieve the best roundness.
Regulating Wheel Dressing Unit: The angle of the regulating wheel dressing unit can be swivelled according to workpiece requirements in order to enhance accuracy.
Spindle: The grinding and regulating wheel spindles are made of high quality alloy steel (SNCM439), induction hardened superfinished. They are sturdy and strong enough to permit heavy duty grinding at high speed and assure superior surface finish.
Hydraulic Dressing Unit: Both grinding wheel and regulating wheel dressing units are hydraulic traversed. Traverse speed is infinitely adjustable. Dressing slides are made of special alloy cast iron and hand scraping. Assures smooth dressing and high accuracy.
Rotary Dressing Unit (optional accessories): Be applicable to the CBN grinding wheel, diamond grinding wheel or general abrasive grinding wheel.
Pressure Switch: One pressure switch is provided in the grinding wheel spindle lubrication system so that the spindle motor won't rotate while the lubrication pressure is reduced. This prevents the spindle from dry running and damage.
Hydraulic Oil Cooling Fan: During grinding, it cools down hydraulic oil temperature and therefore reduce size vibration also enhance grinding wheel spindle life.
Upper Slide: The upper slide can be rapidly and precisely swivelled up to ±5° in order to grind taper in infeed grinding and provide perfect contact between workpiece and grinding wheel in thrufeed grinding.
 
Specifications:

Model

RC-12 RC-16 RC-18 RC-1810 RC-1812 RC-20
Grinding range (dia.) 0.04"~1.58" 0.04"~2" 0.04"~2" 0.04~2" 0.04"~2" 0.04"~2"
Grinding wheel size (dia.x width x hole) 12"x6"x5" 16"x8"x8" 18"x8"x9" 18"x10"x9" 18"x12"x9" 20"x8"x12"
Regulating wheel size (dia.x width x hole) 8"x6"x3.54" 10"x8"x4.38" 10"x8"x4.38" 10"x10"x4.38" 10"x12"x4.38" 12"x8"x5"
Grinding wheel speed 2100rpm 1550rpm 1350rpm 1350rpm 1350rpm 1200rpm
Regulating wheel speed 21~333rpm
(7 steps)
13~308rpm
(10 steps)
13~308rpm
(10 steps)
13~308rpm
(10 steps)
13~308rpm
(10 steps)
13~308rpm
(10 steps)
Grinding wheel motor 7-1/2HP 4P 10HP 4P 15HP 4P 15HP 4P 20HP 4P 20HP 4P
Regulating wheel motor 1HP 6P/
1.3KW (servo motor)
2HP 6P/
1.8KW (servo motor)
2HP 6P/
1.8KW (servo motor)
2HP 6P/
1.8KW (servo motor)
2HP 6P/
2.9KW (servo motor)
2HP 6P/
2.9KW (servo motor)
Hydraulic pump motor 1HP 4P 1HP 4P 1HP 4P 1HP 4P 1HP 4P 1HP 4P
Coolant pump motor 1/8HP 2P 1/4HP 2P 1/4HP 2P 1/4HP 2P 1/4HP 2P 1/4HP 2P
Upper slide feed graduation 3.5mm(rev.)
0.05mm(gra.)
4mm(rev.)
0.05mm(gra.)
4mm(rev.)
0.05mm(gra.)
4mm(rev.)
0.05mm(gra.)
4mm(rev.)
0.05mm(gra.)
4mm(rev.)
0.05mm(gra.)
Upper slide micro feed graduation 0.1mm(rev.)
0.001mm(gra.)
0.1mm(rev.)
0.001mm(gra.)
0.1mm(rev.)
0.001mm(gra.)
0.1mm(rev.)
0.001mm(gra.)
0.1mm(rev.)
0.001mm(gra.)
0.1mm(rev.)
0.001mm(gra.)
Lower slide feed graduation 7mm(rev.)
0.05mm(gra.)
9mm(rev.)
0.05mm(gra.)
9mm(rev.)
0.05mm(gra.)
9mm(rev.)
0.05mm(gra.)
9mm(rev.)
0.05mm(gra.)
9mm(rev.)
0.05mm(gra.)
Lower slide micro feed graduation 0.2mm(rev.)
0.001mm(gra.)
0.2mm(rev.)
0.001mm(gra.)
0.2mm(rev.)
0.001mm(gra.)
0.2mm(rev.)
0.001mm(gra.)
0.2mm(rev.)
0.001mm(gra.)
0.2mm(rev.)
0.001mm(gra.)
Dressing device graduation 1.25mm(rev.)
0.01mm(gra.)
1.75mm(rev.)
0.01mm(gra.)
2mm(rev.)
0.01mm(gra.)
2mm(rev.)
0.01mm(gra.)
2mm(rev.)
0.01mm(gra.)
2mm(rev.)
0.01mm(gra.)
Regulating wheel tile angle ±5° ±5° ±5° ±5° ±5° ±5°
Regulating wheel swivel angle ±5° ±5° ±5° ±5° ±5° ±5°
Net weight (approx.) 3300 Lbs. 4630 Lbs. 5720 Lbs. 5720 Lbs. 7055 Lbs. 7700 Lbs.
Shipping gross weight (approx.) 3860 Lbs. 5280 Lbs. 6380 Lbs. 6380 Lbs. 7930 Lbs. 8370 Lbs.
Size of case (approx.) LxWxH 90"x44"x68" 90"x72"x68" 90"x80"x72" 90"x80"x72" 90"x86"x72" 98"x80"x72"
Price Please Contact Us for More Information
*Specifications are subject to change without notice.
 
Standard Accessories:

1. Standard electrical equipment: 1 set
2. Grinding wheel and flange: 1 set
3. Regulating wheel and flange: 1 set
4. Infeed work rest and carbide blade: 1 set/ 1 pc
5. Thrufeed work rest and carbide blade: 1 set/1 pc
6. Hydraulic oil cooling fan: 1 set
7. Standard coolant tank with pump: 1 set

8. Hydraulic tank with pump: 1set
9. Diamond tool for turing: 2 pcs
10. Work lamp: 1 set
11. Tool box with spanners, screwdrivers, etc.: 1 set
12. Wheel flange extractor
13. Workpiece pressor
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Optional Accessories:

1. Wheel balancing stand and arbor. Call for price
2. Hydraulic work ejector for infeed grinding.Call for price
3. Manual work feeder for infeed grinding.
Call for price
4. Automatic Infeed attachment.
Call for price
5. Automatic loading attachment for thrufeed grinding (Magazine Type). Call for price
6. Automatic loading attachment for thrufeed grinding (Hopper Type).
Call for price
7. Unloading attachment for thrufeed grinding. Call for price
8. Supporter for long bar grinding. Call for price
9. Magnetic coolant separator.Call for price

10. Paper filter. Call for price
11. Hydrocyclone coolant filter.
Call for price
12. Profile template.
Call for price
13. Automatic loading & unloading attachment for infeed grinding.
14. Vibratory feeder for thrufeed grinding.

15. Jig Hook. Call for price
16. Oil cooler.
17. Rotary dressing unit.
18. Jig crane for grinding wheel.
Call for price

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GROMAX Centerless Grinder  
 

Features:

  • Machine base made of the highest grade cast iron with carbonized heat treatment to ensure machine life and rigidity.

  • Slideways of regulating wheel are casted of double reverse V-type and precisely hand scraped & coated with turcite B for smooth movement and longevity.

  • Both the grinding and regulating spindles are made of Ni-Cr-Mo alloy steel, hardened and ground to obtain the highest accuracy

  • The regulating wheel is inclinable for 5 to meet different grinding demands. The spindles are retrofitted with hydrostatic babbit bearings and auto lube system. When the spindle rotates, it creates oil film between the spindle and bearing to prevent any metallic contacts to ensure accuracy and spindle life.

  • Micro switch to detect oil pressure of lube system, spindles will not rotate under insufficient pressure in the interest of safety and machine life, enabling maintenance free conditions.

  • Hydraulic dressing attachment: standard for both grinding and regulating wheels. Variable dressing speed controlled by hydraulic.

 

C12

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Specifications:

Model

C12 C20
General Capacity    
Max. grinding dia. 0.04~1.18" 0.04~2"
Max. grinding dia. w/ special workrest 1.18~2" 2~3.54"
Infeed grinding range 0.08~1.18" 0.08~2"
Grinding Wheel    
Wheel size (dia. x width x bore) 12x5.5x5" 20x8x12"
Spindle speeds 1900 rpm 1070 rpm
Feed of dressing handwheel per graduation 0.00078" 0.00039"
Feed of dressing handwheel per revolution 0.078" 0.059"
Regulating Wheel    
Wheel size (dia. x width x bore) 8x51/2x31/2" 12x8x5"
Spindle speeds (10 steps) 15~310 rpm 13~308 rpm
Feed of handwheel per graduation 0.002" 0.002"
Feed of handwheel per revolution 0.16" 0.16"
Swiveling angle (L & R) 5 5
Inclining angle (for & rev) 5 5
Rapid feed of saddle handwheel per grad. 0.00125" 0.0002"
Rapid feed of saddle handwheel per rev. 0.20" 0.24"
Micro feed of saddle handwheel per grad. 0.00005" 0.00005"
Micro feed of saddle handwheel per rev. 0.0008" 0.00625"
Motors    
Grinding wheel motor 5 HP 20 HP
Hydraulic motor 1 HP 2 HP
Weight    
Net (approx.) 2640 Lbs. 6600 Lbs.
Gross (approx.) 3300 Lbs. 7260 Lbs.
Packing    
Length x Width x Height 70x53x65" 89x82x85"
 
Standard Accessories:
1. Grinding wheel with flange
2. Regulating wheel with flange
3. Wheel extractor
4. Tool box with adjusting tools
5. Diamond dresser
6. Balancing arbor
7. Standard thrufeed workrest with blade
8. Leveling screws with blocks
9. Operation manual with parts list
10. Auto lube system (for spindles)
11. One-shot lubricator (for slideways)
 
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Optional Accessories:

Description

For C12 For C20
1. Spare wheel flange C12.1
Please
Call for Price
C20.1
Please
Call for Price
2. Infeed workrest C12.2 C20.2
3. Infeed blade C12.3 C20.3
4. Special thrufeed workrest C12.4 C20.4
5. Thrufeed blade C12.5 C20.5
6. Input rail & output rail C12.6 C20.6
7. Balancing stand C12.7 C20.7
8. Electric eject attachment C12.8 C20.8
9. Long thrufeed guide (6 ft.) C12.9 C20.9
10. Coolant system w/ magnetic separator & paper filter 40L/min. C12.10 C20.10
11. Spare grinder wheel C12.11 C20.11
12. Spare regulating wheel C12.12 C20.12
 

| surface grinder | cylindrical grinder | rotary type surface grinder |
| centerless grinder | cutter & tool grinder/drill sharpener | pin cut-off machine |

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