NC Centerless Grinding Machine

Grinding Applications

Thrufeed grinding

Infeed grinding

Control Axis Diagram

1 Axis<br> Z Axis: Upper or lower slide movement

1 Axis
Z Axis: Upper or lower slide movement

2 Axes<br> X Axis: Grinding wheel dressing <br> Z Axis: Lower slide movement

2 Axes
X Axis: Grinding wheel dressing
Z Axis: Lower slide movement

3 Axes<br> X, Y Axis: Grinding wheel dressing with interpolation<br> Z: Lower slide movement

3 Axes
X, Y Axis: Grinding wheel dressing with interpolation
Z: Lower slide movement

4 Axes
X, Y Axis: Grinding wheel dressing (Profile dressing)
Z Axis: Lower slide movement
Z1 Axis: Upper slide movement

5 Axes<br> X1, Y1 Axis: Regulating wheel with interpolation<br> X Axis: Grinding wheel dressing <br> Z Axis: Lower slide movement <br> Z1 Axis: Upper slide movement

5 Axes
X1, Y1 Axis: Regulating wheel with interpolation
X Axis: Grinding wheel dressing
Z Axis: Lower slide movement
Z1 Axis: Upper slide movement

6 Axes<br> X, Y Axis: Grinding wheel dressing with interpolation<br> X1, Y1 Axis: Regulating wheel dressing with interpolation<br> Z Axis: Lower slide movement<br> Z1 Axis: Upper slide movement

6 Axes
X, Y Axis: Grinding wheel dressing with interpolation
X1, Y1 Axis: Regulating wheel dressing with interpolation
Z Axis: Lower slide movement
Z1 Axis: Upper slide movement

Machine Design Feature

LCD Touch Screen Control Technology
Auto-infeed Grinding Cycle

Cycle sequence:

S1-Rapid approach
S2-Coarse grinding
T1-Dwell time
S3-Fine grinding
T2-Sparkout dwell time
S4-Rapid retract

Automation Solution

Multiple machines can be linked to do rough, medium and fine grinding in one production line to save time for repetitive loading and unloading procedure.

Blade Selection

Due to different working diameters, the guide plate and regulating wheel must be parallel as this influences the grinding accuracy significantly.

Part name：Step shaft

Infeed grinding + auto-loading/unloading
Material：SCM415
Removed stock：Max. ∅0.2mm
Cycle time：25sec(loading/unloading included)
Roundness：1.5μm

Part name：Ball Piston

Infeed grinding + auto-loading/unloading
Material：SCM415
Removed stock：Max. ∅0.3mm
Cycle time：26sec(loading/unloading included)

Part name：Piston pin

Thrufeed grinding
Material：SCr21H
Removed stock：Max. ∅0.13mm
Feedrate：3m/min
Roundness：1.2μm

Grinding Sample

Specification

			Compare ECG-NC1206	Compare ECG-NC1808	Compare ECG-NC1810	Compare ECG-NC1812	Compare ECG-NC2008	Compare ECG-NC2010	Compare ECG-NC2012	Compare ECG-NC2408	Compare ECG-NC2410	Compare ECG-NC2412
Grinding Capacity	Work diameter (w/standard workrest)	mm	Ø1-30	Ø1-60	Ø1-60	Ø1-60	Ø1-60	Ø1-60	Ø1-60	Ø1-80	Ø1-80	Ø1-80
	Work diameter (w/special workrest)	mm	Ø30-50	Ø60-100	Ø60-100	Ø60-100	Ø60-120	Ø60-120	Ø60-120	Ø80-150	Ø80-150	Ø80-150
	Auto infeed min. increment	mm	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
Grinding Wheel	Wheel size (OD x Width x ID) 08type	mm	φ305x150xφ120	φ455x205xφ228.6	φ455x205xφ228.6	φ455x205xφ228.6	φ510x205xφ304.8	φ510x205xφ304.8	φ510x205xφ304.8	φ610x205xφ304.8	φ610x205xφ304.8	φ610x205xφ304.8
	Wheel size (OD x Width x ID) 10type	mm	-	φ455x255xφ228.6	φ455x255xφ228.6	φ455x255xφ228.6	φ510x255xφ304.8	φ510x255xφ304.8	φ510x255xφ304.8	φ610x255xφ304.8	φ610x255xφ304.8	φ610x255xφ304.8
	Wheel size (OD x Width x ID) 12type	mm	-	φ455x305xφ228.6	φ455x305xφ228.6	φ455x305xφ228.6	φ510x305xφ304.8	φ510x305xφ304.8	φ510x305xφ304.8	φ610x305xφ304.8	φ610x305xφ304.8	φ610x305xφ304.8
	Motor rated power / max. torque	kw/Nm	5.5/36(Opt. 7.5/49)	11/71(Opt. 15/97)	11/71(Opt. 15/97)	11/71(Opt. 15/97)	15/97(Opt. 18.75/120)	15/97(Opt. 18.75/120)	15/97(Opt. 18.75/120)	15/97(Opt. 22.5/143)	15/97(Opt. 22.5/143)	15/97(Opt. 22.5/143)
	Spindle speed	rpm	2080	1400	1400	1400	1250	1250	1250	1050	1050	1050
	Dressing increment per gra./rev.	mm	0.01 / 1.5	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2
Regulating Wheel	Wheel size (OD x Width x ID) 08 type	mm	φ205 x 150 x φ90	φ255x205xφ111.2	φ255x205xφ111.2	φ255x205xφ111.2	φ305x205xφ127	φ305x205xφ127	φ305x205xφ127	φ355x205xφ152.4	φ355x205xφ152.4	φ355x205xφ152.4
	Wheel size (OD x Width x ID) 10 type	mm	-	φ255x255xφ111.2	φ255x255xφ111.2	φ255x255xφ111.2	φ305x255xφ127	φ510x255xφ304.8	φ305x255xφ127	φ355x255xφ152.4	φ355x255xφ152.4	φ355x255xφ152.4
	Wheel size (OD x Width x ID) 12 type	mm	-	φ255x305xφ111.2	φ255x305xφ111.2	φ255x305xφ111.2	φ305x305xφ127	φ510x305xφ304.8	φ305x305xφ127	φ355x305xφ152.4	φ355x305xφ152.4	φ355x305xφ152.4
	Spindle speed (infinite variable)	rpm	15-310	15-310	15-310	15-310	15-310	15-310	15-310	15-310	15-310	15-310
	Upper slide infeed handwheel per gra./rev.	mm	0.02 / 4	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5	0.05 / 3.5
	Upper slide micro infeed handwheel per gra./rev.	mm	N/A	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02	0.001 / 0.02
	Swivelling angle (L/R)	deg	±5°	±5°	±5°	±5°	±5°	±5°	±5°	±5°	±5°	±5°
	Inclining angle (F/R)	deg	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°	+5° ～ -3°
	Dressing increment(X1,Y1) per gra./rev.	mm	0.01 / 1.5	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2	0.01 / 2
	Regulating wheel motor	kw	2	3	3	3	3	3	3	5	5	5
	Infeed servo motor (NC)	kw	1	1	1	1	1	1	1	2.5	2.5	2.5
Motors	Hydraulic motor	kw	0.75	0.75	0.75	0.75	0.75	0.75	0.75	0.75	0.75	0.75
Machine	Net weight	kg	1800	3300	3300	3300	3400	3400	3400	6100	6100	6100
	Gross weight	kg	2200	3600	3600	3600	3700	3700	3700	6600	6600	6600
	Packing size (L x W x H)	mm	2260x1950x1820	2700x2240x1850	2700x2240x1850	2700x2240x1850	2700x2240x1850	2700x2240x1850	2700x2240x1850	3580x2240x2070	3580x2240x2070	3580x2240x2070

Spec Download

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

Auto. unloading system for thrufeed grinding

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

Coolant system with magnetic separator & paper filter

Infeed grinding workpiece eject attachment ( hydraulic / pneumatic )

Auto. loading system for thrufeed grinding (Φ5∼25mm, L 50∼600mm)

Hopper type auto. loading system for thrufeed grinding (Φ2∼8mm, L 50∼180mm)

Input rail & output rail

Balancing stand/ arbor

Spare regulating wheel flange

Spare grinding wheel flange

CE standard electrical cabinet

Special workrest (for large dia. Workpiece)

Minor diameter workrest (dia. 0.7~8mm)

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.

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.

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

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

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

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.

Features
ECG series high precision centerless grinder is different from other competitors, we use spectrum analyzer to precisely analyze the machine base inner ribs and casting thickness for greater rigidity. We offer hydrodynamic alloy bearing spindle with best rotation accuracy, suitable for heavy duty jobs, and drastically increase the spindle longevity.

NC Series
With all the advantage of S series, NC series further offers lower slide (Z axis) with servo motor driven design which enables the infeed position located precisely, and the infeed distance can be controlled by numerical value.
Auto. grinding wheel dressing and compensation system can be equipped as optional accessories and led to easy computer numerical control grinders for operators.

Centerless Grinder