Centerless Grinder

STC-S

Manual and NC Series

PDF

Feature

Sand Repairing Device

A hydraulic dressing unit on both the grinding and regulating wheels with precisely handscraped guide ways provides stable hydraulic movement and the best dressing effects. Various types of form dressing can be achieved with optional templates.

  • NC model: optional auto. grinding wheel dressing device enables count dressing, time dressing, or auto dressing and compensation
  • CNC model: with two axes servo control and the automatic compensation system can precisely dress forms with complicated shapes.
  • Various workrest design: E-tech developed various kinds of workrest based on different diameter of workpieces, which are easy for operating adjustment.

Spindle: Dynamic/Static Pressure Spindle

Both grinding & regulating wheel spindles are made of Ni-Cr-Mo alloy steel, which is normalized, carbonized, hardened and grounded.

Adjustment Wheel Servo Vontrol

The regulating wheel utilizes a servo motor which provides infinitely variable speeds. The speed can be set digitally to reach constant surface speeds even when the diameter of the regulating wheel changes. Consequently, better surface finishes and roundness of the workpiece can be achieved. A beltdriven transmission system is also adopted for the regulating wheel for less vibration and noise compare to traditional chain-driven system

Stop Grinding Automatic Feed (NC Type)

Automatic infeed models (NC) are equipped with a PLC touch screen control with easy learning conversational software.
An infeed grinding cycle can be completed by simply choosing the grinding cycle mode (single or automatic), inputting grinding data and then pressing cycle start.

Adjust Wheel Feed

A double inverted “V” slideway with optimum spacing for the regulating wheel assembly provides smooth movement and stable grinding operation.

Mechanical Base

The machine base is made of Meehanite castings designed to reduce vibration. The machine base provides stable support to the grinding wheel and regulating wheel assemblies to ensure a rigid machine foundation and better accuracy.

Grinding Example

Grinding Cycle

Thrufeed grinding

Thrufeed grinding

Thrufeed grinding

Thrufeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Infeed grinding

Specification

Model Unit STC-S
1206
STC-S
1808/1810/1812
STC-S
2008/2010/2012
STC-S
2408/2410/2412
Grinding Capacity
Work diameter (w/standard workrest) Ø0.04"~1.18" Ø0.04"~2.36" Ø0.04"~2.36" Ø0.04"~3.14"
Work diameter (w/special workrest) Ø1.18"~2" Ø2.36"~4" Ø2.36"~4.7" Ø3.14"~5.9"
Grinding Wheel
Wheel size (OD x Width x ID) 08type φ12"x6"xφ4.7" φ18"x8"xφ9" φ20"x8"xφ12" φ24"x8"xφ12"
Wheel size (OD x Width x ID) 10type X φ18"x10"xφ9" φ20"x10"xφ12" φ24"x10"xφ12"
Wheel size (OD x Width x ID) 12type X φ18"x12"xφ9" φ20"x12"xφ12" φ20"x12"xφ12"
Motor rated power / max. torque HP/Nm 7.5/36(Opt.10/49) 15/17(Opt.20/97) 20/97(Opt.25/120) 20/97(Opt.30/143)
Spindle speed rpm 2080 1400 1250 1050
Dressing infeed per gra./rev. 0.0005" / 0.05" 0.0005" / 0.0625" 0.0005" / 0.0625" 0.0005" / 0.0625"
Regulating Wheel
Wheel size (OD x Width x ID) 08 type φ8"x6"xφ3.54" φ10"x8"xφ4.3" φ12"x8"xφ5" φ14"x8"xφ6"
Wheel size (OD x Width x ID) 10 type X φ10"x10"xφ4.3" φ12"x10"xφ5" φ14"x10"xφ6"
Wheel size (OD x Width x ID) 12 type X φ10"x12"xφ4.3" φ12"x12"xφ5" φ14"x12"xφ6"
Spindle speed (infinite variable) rpm 15-310 15-310 15-310 15-310
Upper slide infeed handwheel per gra./rev. 0.00125" / 0.125" 0.002" / 0.2" 0.002" / 0.2" 0.002" / 0.2"
Upper slide micro infeed handwheel per gra./rev. N/A 0.00004"/ 0.004" 0.00004"/ 0.004" 0.00004"/ 0.004"
Swivelling angle (L/R) deg ±5° ±5° ±5° ±5°
Inclining angle (F/R) deg +5° ~ -3° +5° ~ -3° +5° ~ -3° +5° ~ -3°
Dressing increment (per gra./rev.) 0.0005" / 0.05" 0.0005" / 0.0625" 0.0005" / 0.0625" 0.0005" / 0.0625"
Lower slide infeed handwheel (per gra./rev.) 0.0025" / 0.25" 0.002" / 0.25" 0.002" / 0.25" 0.002" / 0.25"
Lower slide micro infeed handwheel (per gra./rev.) 0.00005" / 0.005" 0.00005" / 0.00625" 0.00005" / 0.00625" 0.00005" / 0.00625"
Regulating wheel motor HP 2.68 4 4 4
Motor
Hydraulic motor HP 1 1 1 1
Machine
Net Weight Lbs. 3,968 7,275 7,495 13,448
Gross weight Lbs. 4,850 7,936 8,157 14,550
Packing size (L x W x H) 89"x76"x71" 106"x88"x73" 106"x88"x73" 141"x88"x81"

Accessories

Standard Accessories
Tools and tool box
Standard coolant tank
Wheel extractor
Diamond dresser
Levelling bolts and blocks
Grinding wheel with flange
Regulating wheel with flange
Spindle lubrication system w/ cooling fan
Regulating wheel with flange
Manual lubricator for guide ways (S model)
Operation manual and part lists
Thrufeed workrest
Infeed workrest
Control panel (S model)
PLC controller + touch screen + control panel (NC model)
FANUC 0i-TF CNC controller (CNC model)
Optional Accessories
Vibration feeder auto. loading system
Forming attachment (forming plates)
Coolant system with magnetic separator
Thrufeed blade (various sizes)
Infeed blade (various sizes)
Hydraulic forming attachment
Coolant system with paper filter
Auto. unloading system for thrufeed grinding
Coolant system with magnetic separator & paper filter
Infeed grinding workpiece eject attachment (hydraulic / pneumatic)
Auto. loading system for thrufeed grinding (Φ0.197"~0.984", L 1.968"~23.6")
Hopper type auto. loading system for thrufeed grinding (Φ0.078"~0.314", L 1.968"~7")
Minor diameter workrest (dia. 0.027"~0.314")
Special workrest (for large dia. Workpiece)
Input rail & output rail
Balancing stand/ arbor
Spare regulating wheel flange
Spare grinding wheel flange
CE standard electrical cabinet

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