Electro-Permanent Magnetic Chuck

Name: Electro-Permanent Magnetic Chuck
Brand: Earth-Chain
SKU: EEPM-M
Availability: BackOrder

Product NO: EEPM-M

Price range: ¥748,000 through ¥2,055,000

Product No

Clear

Specification

Total Chuck Clamping Force: 616 to 1,694 kg

Magnetic force per 4 poles: 88 kg

Ideal for machining thin workpieces (approx. 10 mm thick) and small workpieces.

Product Specifications (Variations)

unit：mm

Product NO	W	L	S	S1	M	PitchＧ	Number of magnetic poles	Total holding power（kgf）	weight（kg）	current	Controller (included)
EEPM-1020M	120	202	15	10	35	4	28	616	7	12A	EEPM-C1
EEPM-1030M	120	298	15	10	35	4	44	968	10	15A	EEPM-C1
EEPM-2020M	192	202	15	10	35	4	49	1078	11	13A	EEPM-C2
EEPM-2030M	192	298	15	10	35	4	77	1694	16	17A	EEPM-C4

Power: Single-phase AC 200 V

Product Features

Increase Machining Efficiency While Reducing Fixturing Costs

Problem

Increase Machining Efficiency and Reduce the Need for Dedicated Fixtures

Conventional power vises allow only two units to be mounted on the machine table, restricting simultaneous machining to two workpieces.

While dedicated fixtures can improve productivity, their manufacturing and maintenance costs are high. Reducing these fixture-related costs has become an important challenge for manufacturers.

Solution

Magnetically Clamp Multiple Workpieces at Once with an Electro-Permanent Magnetic Chuck!

With conventional power vises, only two workpieces could be machined simultaneously. By introducing an electro-permanent magnetic chuck, up to six workpieces can now be machined at the same time, increasing machining efficiency by a factor of three.

Eliminating the need for dedicated fixtures and switching to an electro-permanent magnetic chuck has dramatically reduced fixture manufacturing costs.

In addition, fixture interference issues have been eliminated, providing greater machining flexibility and improved accessibility.

Eliminate Fixture Interference

Problem

Reduce Fixture Interference and Minimize the Use of Dedicated Fixtures

The workpiece is first clamped from the side and aligned before machining the top surface. It is then clamped from above to machine the side surfaces.

Although dedicated fixtures have been used to improve machining efficiency, the cost of designing and manufacturing these fixtures is substantial. Reducing these fixture-related costs has become an important challenge.

Solution

Reduce Setup Time and Fixture Costs with an Electro-Permanent Magnetic Chuck

By using an electro-permanent magnetic chuck, the workpiece is securely held by magnetic force from below, enabling five-sided machining.

Because both face machining and side machining can be performed without changing the clamping setup, machining efficiency is dramatically improved.

Furthermore, replacing dedicated fixtures with an electro-permanent magnetic chuck has significantly reduced fixture manufacturing costs.

Features and Construction

Features of Electro-Permanent Magnetic Chucks

・Structural Diagram

The chuck features a combination of high-holding-force neodymium magnets and lower-holding-force Alnico magnets.

The magnetic polarity of the Alnico magnets is reversed by an electric current flowing through coils wound around them.

As illustrated in the magnetic circuit above, this configuration generates a powerful magnetic holding force of 1,250 kg per four poles at the chuck surface.

No Risk of Chips Adhering to the Workpiece Due to Magnetic Force

・Magnetic Flux of the Electro-Permanent Magnetic Chuck

EEPM Series Magnetic Flux Height & Recommended Workpiece Size

Model	Magnetic pole size	Magnetic flux height	Recommended Workpiece Size	Applicable Machining Methods	Magnetic Force per Four Poles
EEPM-M	20x20mm	10mm	Thin workpieces (approx. 10 mm thick)	Cutting	88kgf
EEPM-A	35x35mm	15mm	Small workpieces (15 mm thick or greater)		580kgf
EEPM-B	50x50mm	25mm	Medium-sized workpieces (25 mm thick or greater)		1,250kgf
EEPM-D	70x70mm	40mm	Large workpieces (40 mm thick or greater)		2,800kgf