7H-MODEL

NAKANE Live Center Slide Back TYPE H-MODEL

MT. No3, No4, No5

In keeping up with the recent advance of the machine and cutting tools, the 7H live center, featuring heavy-duty performance, has been employed at high speed heavy-duty cutting operations. To meet these requirements, this live center has been developed to have greater durability against heavy loads than the standard types, assuring adaptability for copy lathe work.

This model features high speed and heavy-duty cutting.

The center runout accuracy is less than 0.003 mm and is optimally fitted for precision machining.

The live center itself is designed as a bearing. This minimizes the outer diameter and eliminates interruption during the movement of the tool. This is optimally suitable for copying work.

The use of the slide system prevents the workpiece from being subjected to deformation due to thermal expansion during the machining operation and also prevents the center hole from being worn. The thrust bearing is free or any unnatural loads.
FOR COPYING LATHE WORK


Dimentions		(Unit:mm)											Wt.
Model	(MT)	a	A	B	C	L	M	D	d'	d	?ПМ/TD>	?ПЇ	(kg)
?g?\|No.3	3	7	32	55.5	85.5	173	5	46.5	8	22	60?K	40?K	0.79
?g?\|No.4	4	8	40	68	108.5	216.5	6	60	10	27.5	60?K	40?K	1.61
?g?\|No.5	5	11	54	95	139	288	8	87	14	38	60?K	40?K	4.79

Advantages

Accuracy

The runout accuracy of the center tip section in the radial direction is maintained at less than 0.003 mm.

Configuration

The live center itself is designed as a bearing. This permits the design of the small external diameters and sharp angles at the head section, without interrupting the movement or the cutting tool. This live center is effectively employed in copying lathe work.

Construction

This live center is constructed in a unique design which is unparalleled in the history of live cneter production. The radial bearing (roller bearing) is positioned closest to the tip section and the thrust bearing is designed to have maximum size, guaranteeing that the live center can withstand high speed heavy-duty cutting operations. In order to prevent bending due to thermal expansion and friction due to the play at the tip hole and slip at the tip section, a slide system was adopted by using the beleville spring.

Machining

SuJ2 (bearing steel) is used for the tapered section as well as the conical section, which have the same degree of hardness as the bearing (Rockwell hardness 60?K through 63?K) and are precision machined.

Maintenance

The special grease is used to minimize the grease consumption and eliminates the need for replenishment.

Use

The live center is designed to have a small size, and is best suited for copying lathe work. It is also effectivley used in cutting slender and long workpieces without the need of adjusting the pressure.

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