GPR Tops

C Series

Type - C

These live centers are designed for CNC machine tools and copying lathes with hydraulic tail-stocks as well as for machining workpieces with small center holes, and precision machining at ultrahigh RPM speeds.

No maintenance up to 2000 hours and longer service life due to lifetime lubrication of the roller bearings.

• Concentricity ≤ 5µm
• High speeds of 10 000 RPMs
• Drop-forged shank made of hardened steel
• Rotating point made of through-hardened, alloy steel
• Four-point support for high axial and radial loads
• Double labyrinth seal design

Model Number	Shank	Size (mm)					Workpiece Weight	Permissible Speed
	K	A	B	C	D	d	Max Kg	min -1 Max
C-3	Morse 3	29	48	86	57	22	750	10,000
C-3	Ø 25mm	29	48	54.5	57	22	750	10,000
C-3	Ø 25.4mm	29	48	54.5	57	22	750	10,000
C-3	Ø 32m	29	48	86	57	22	750	10,000
C-4	Morse 4	38	60	108.5	70	30	1400	8,000
C-4	Ø 32m	38	60	108.5	70	30	1400	8,000
C-5	Morse 5	52	77	135	96	45	2500	6,000
C-6	Morse 6	74	100	187.5	128	65	3800	4,000

R Series

Type - RV

The RV version is particularly suitable for turning shafts with small diameters and for use on CNC and copy lathes.

It features pressure indication and has an extended point instead of the standard 60°.

When turning, the optimal clamping pressure is determined for each workpiece. In the R series, the pressure set for axial clamping causes the tip to shift in relation to the housing, indicated by the colored rings. The diagram below shows the corresponding position for each tip size at a given axial clamping pressure. Expansion of the workpiece, caused by heating during processing, is automatically compensated.

Model Number	Shank	Size (mm)				Workpiece Weight	Permissible Speed
		A	B	C	D	Max Kg	min -1 Max
RV-3	Morse 3	42	10	24	12	550	4000
RV-3	Ø 32mm	42	10	24	12	550	4000
RV-4	Morse 4	60	12	37	14	900	3000
RV-4	Ø 32mm	60	14	37	12	900	3000
RV-5	Morse 5	88	15	60	18	1400	2000
RV-6	Morse 6	125	19	90	22	2500	1000

X Series

Type - XN / XNP

The X-Series live centers are specifi cally designed for high precision grinding and measuring applications.

• Concentricity standard ≤ 3µm
• Concentricity precision design ≤ 1µm
• Comes with a Test report of the concentricity
• Especially suitable for use on cylindrical grinding, measuring and testing machines
• Hardened tip
• Different tip shapes
• Case hardened
• A shaft seal protects the bearing against dirt and coolant
• Maintenance-free for up to 2000 hours thanks to permanent lubrication

Model Number	Shank	Size (mm)				Workpiece Weight	Permissible Speed
	K	A	B	D	d	Max Kg	min -1 Max
XN-2	Morse 2	64	22.5	32	18	300	3300
XN-3	Morse 3	73.5	23.5	40	20	450	3000
XN-4	Morse 4	82	28	45	25	550	2500
XNP-2	Morse 2	64	22.5	32	18	300	3300
XNP-3	Morse 3	73.5	23.5	40	20	450	3000
XNP-4	Morse 4	82	28	45	25	550	2500

Concentricity: XP = ≤ 3µm | XNP ≤ 1µm

P Series

Type - PN

The P-Series live centers meet highest accuracy standards and are mainly for measuring and testing applications. These centers are also used for high precision grinding applications.

• Runout accuracy ≤ 1µm
• Test report of the concentricity
• Especially suitable for use on testing, measuring and cylindrical grinding machines
• Hardened tip
• Sealed bearings prevent the ingress of dirt and cooling water
• Maintenance-free for up to 2000 hours thanks to permanent lubrication

Model Number	Shank	Size (mm)		Workpiece Weight	Permissible Speed
		A	D	Max Kg	min -1 Max
PN-242	Morse 2	64	42	50	4000
PN-252	Morse 2	79	52	100	3000
PN-264	Morse 2	98	64	150	3000
PN-342	Morse 3	64.5	42	50	4000
PN-352	Morse 3	79.5	52	100	3000
PN-364	Morse 3	98.5	64	150	3000
PN-452	Morse 4	81.5	52	100	3000
PN-464	Morse 4	100.5	64	150	3000

Carbide Dead Centers

The RV version is particularly suitable for turning shafts with small diameters and for use on CNC and copy lathes.

When turning, the optimal clamping pressure is determined for each workpiece. In the R series, the pressure set for axial clamping causes the tip to shift in relation to the housing, indicated by the colored rings. The diagram below shows the corresponding position for each tip size at a given axial clamping pressure. Expansion of the workpiece, caused by heating during processing, is automatically compensated.

Model Number	Shank	Size (mm)				Workpiece Weight	Permissible Speed
		A	B	C	D	Max Kg	min -1 Max
RV-3	Morse 3	42	10	24	12	550	4000
RV-3	Ø 32mm	42	10	24	12	550	4000
RV-4	Morse 4	60	12	37	14	900	3000
RV-4	Ø 32mm	60	14	37	12	900	3000
RV-5	Morse 5	88	15	60	18	1400	2000
RV-6	Morse 6	125	19	90	22	2500	1000

Truncated Cone Point

• Runout accuracy ≤ 0.001 mm
• Test report of the concentricity
• Especially suitable for use on testing, measuring and cylindrical grinding machines
• Hardened tip
• Sealed bearings prevent the ingress of dirt and cooling water
• Maintenance-free for up to 2000 hours thanks to permanent lubrication

Model Number	Shank	Size (mm)		Workpiece Weight	Permissible Speed
		A	D	Max Kg	min -1 Max
PN-242	Morse 2	64	42	50	4000
PN-252	Morse 2	79	52	100	3000
PN-264	Morse 2	98	64	150	3000
PN-342	Morse 3	64.5	42	50	4000
PN-352	Morse 3	79.5	52	100	3000
PN-364	Morse 3	98.5	64	150	3000
PN-452	Morse 4	81.5	52	100	3000
PN-464	Morse 4	100.5	64	150	3000