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GN 865

Power Clamps

Pneumatic

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Description

Specification

Type

Type BI: Clamping arm vertical

Steel C 45

Chemically nickel plated NC

Max. pressure 10 bar

Information

The maximum clamping moment of the power clamps GN 865 is reached once the clamping arm is at the end of its stroke. For this reason the working stroke should be completed as closely as possible to the stroke end.

Information for pneumatic fastening clamps

On request

With anti-stick coating for protection against welding spray and corrosion

Technical Information

ISO-Fundamental Tolerances

List of pneumatic clamps

Operating principle dead point mechanism

These pneumatically operated power clamps (Patent MISATI) are used for clamping, holding, gripping and positioning of work pieces in jigs and handling systems.

The salient points of these power clamps are:

the high clamping force

the small dimensions

the reduced air consumption

the light weight

The drawings shown here explain the functional principle of the dead point mechanism.

Pistons with diameters of 20, 32, 40 and 50 mm yield a clamping force of 60 Nm up to 475 Nm, which leads to clamping forces being much above those of competitors’ power clamps.

The power clamps have been designed and configured to achieve an extended life. Functional tests have proved that even after 20 million cycles they were still serviceable.

Further salient design points are:

The clamp is kinematically designed such that self-retention (holding force FH) is achieved in the clamped position (clamping force FS) after passing the dead point due to irreversibility.

The forward stroke sequence of the clamping arm is rapid but the ultimate clamping action is slow and as a result pneumatic damping is normally not required. Upon request, however, it can be supplied when big masses are moved.

The clamping mechanism is fitted with needle bearings which give optimum clamping forces and reduced wear.

The steel cylinder with the integrated clamping mechanism are in one unit. This leads to high stability for these small units with an extended range of applications. The placement of the air connection at the bottom end leads also to many other advantages.

The clamping mechanism of GN 864 is also shrouded to avoid the ingress of dirt and other objects which could interfere with the proper functioning of the clamps (such as welding operations!).

Installation examples

Principle of operation

GN 865

	Size	max. clamping moment in Nm at 6 bar	F_S in N Clamping force at r at 6 bar	F_H Holding capacity at r	a	b -0.2	d₁ h8	d₂	d₃ H8	d₄	d₅ Thread	h₁	h₂	l₁ -0.5	l₂ -0.5	l₃	l₄	l₅	l₆	l₇ -0.5	m₁ ±0.01	m₂	m₃ ±0.01	m₄ ±0.01	m₅ ±0.01	m₆	r	s	t
Code																															Actions
GN 865-20-BI-NC	20	60	1250	4000	10.5	10	28	M 5	7	4.2	M 5	16	16	150	171	70	21	4.5	21	97	12	7.5	17	34	22	13	47.5	32	13	620
GN 865-32-BI-NC	32	150	2220	6962	15.5	12	40	M 6	9	5	G 1/8	21	21	206	237	91	31	6	31	133	18	10	25	51	30	22	67.5	42	15	1517
GN 865-40-BI-NC	40	300	3640	9139	18.5	16	50	M 8	11	6.8	G 1/8	26	26	244	282	104	38	7.5	38	155	22	13	30	62	37	25	82.5	52	18	2800
GN 865-50-BI-NC	50	475	4900	12331	21.5	18	60	M 10	13	8.5	G 1/8	31	31	279	323	110.5	44	8	44	174	27	12	47	71.5	44	35	96.5	62	21	4000

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