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BRUCKNER LIVE CENTERS
LIVE CENTERS, DEAD CENTERS, AND FACE DRIVER CENTERS

LIVE CENTERS

LK SERIES
LKH, LKHG
   
   
   
   
   
   
   
   
   
   
   
   
   
LRS AND LRV TYPE
Spring loaded for workpiece thermal expansion
with
pressure indicating colored rings
LD TYPE
Spring loaded for workpiece thermal expansion
WITHOUT
pressure indicating rings
LRE AND LDE TYPE
Female centerpoint, spring loaded center, with or without pressure indicating rings. Available with 7 standard types of interchangeable tips 
S AND SKOP TYPE
Angle 60°, 
Angle 60°/40°, & Extended Centers
SH AND SV TYPE
Carbide-tipped & Full Carbide tip with safety core
SE TYPE
Multiple use with 8 styles of  Interchangeable Inserts
NC AND NCE TYPE
For High RPM
Applications
1000, 2000, 2030 BOKO TYPE
Angle 60°, angle 60°/30°,
& Extended Centers
VERSION A
All Models available with a threaded body for a draw off nut (i.e. A SKOP, A SE, etc.)
F, FE, MAXIMA TYPE
Spring Loaded for workpiece thermal expansion
M, MG, AM, AND AMG TYPE
HEAVY DUTY

Centerpoint 60º, 75º, or 90º - available with threaded body for a draw-off nut (version A)
M AND MRG TYPE
HEAVY DUTY
Centerpoint 60º, 75º, 90º - with tailstock sleeve support ring
MZ AND MZR TYPE
HEAVY DUTY

Spring loaded with pressure indicator on body - Centerpoint 60º, 75º, 90º
ZA AND ZAG BULL NOSE CENTERS
Great for circular grinding operations - available with or without thread for draw-off nut
DEAD CENTERS
E, L, V CARBIDE FORMS
Full center. To German Industrial Standard (DIN) 806E, large carbide diameters, extended center
Z,R,B, AND HB CARBIDE FORMS
Larger carbide diameters up to 100mm. Female carbide centers.
HE,HL, HS, GHS CARBIDE FORMS
Half center. To DIN 806HE, large carbide diameters, extended centers, with extremely flat heights
GE,GV,GZ,ANDGR CARBIDE FORMS
With thread for draw-off nut. To DIN 807E, larger carbide diameters
255,256,257,258 STEEL BODY FORMS
Interchangeable dead centers with thread for draw-off nut and spanner flat for revolving tailstock-sleeves.
250,251, 252,253,254 FORMS
To DIN 806. Female, full and half centers.  Hardened tool steel.
220 AND 230 FORMS
Interchangeable dead centers with steep taper for revolving tailstock sleeves. Hardened tool steel.
KE, SPHG, SPHA FORMS
Adapter and Reduction sleeves.
With and without thread for draw-off nut.
MECHANICAL FACE DRIVE CENTERS
SMK TYPE SMM TYPE SMF TYPE
HYDRAULIC FACE DRIVER CENTERS
HS2 HS3 HS200 HS250
 

LIVE CENTERS
Live centers are available with extended points, which provide maximum tool clearance but sacrifice some rigidity, or with shorter points, which offer rigidity but sacrifice some tool clearance. A wide variety of live centers are available. Generally, look for centers that have been designed specifically for your application. CNC heavy duty centers for CNC lathes, spline rolling centers for spline rollers, super accurate centers for grinding, heavy duty and extra heavy duty models for large parts and bull nose centers for parts with large center holes.
Selecting live centers requires a clear understanding of the application's needs. Rpm, work piece weight, tool and tailstock pressure, center hole size, and the need for tool clearance should all be considered carefully. Manufacturers' recommendations for maximum work piece weight and RPM play a key role in center selection. Exceeding limits for a live center is extremely dangerous. When in doubt, consult the center's manufacturer. In general, leave a comfortable margin for both weight and RPM.
DEAD CENTERS
Dead centers can be full centers or half centers. Half dead centers have a large cut out removing most of the point. They're typically used for additional wheel clearance when grinding small parts whose diameter is less than that of the dead center. The cut away section provides clearance so the grinding wheel can advance to the part without hitting the center. Full centers have the entire point.
Carbide tips can be brazed to the same steel shanks that are used in steel centers. They are also available as full or half dead centers. In high volume operations carbide centers are preferred, due to the high wear resistance of carbide. When holding highly abrasive or very hard materials, carbide centers outperform steel centers.

FACE DRIVERS
A face driver does away with the need to flip the workpiece during the production process and allows for the entire piece to be worked in one operation. In this process the piece of steel is centered in the machine using a live center that locates its point in the center hole on one end of the workpiece. A face driver then uses tailstock pressure to engage the workpiece with its center point which locates the part and provides a consistent axis of rotation. As the machine’s tailstock pressure continues to drive the workpiece against the center point, the axial pressure forces the spring-loaded center point back into the carrier body until the drive pins engage the face of the workpiece, eliminating the need to chuck on the outer diameter. Each pin individually compensates for any irregularities in the face until all pins are fully engaged. This technique removes the chuck jaws from the path of the cutting tool and enables the piece to be worked from end to end, simultaneously cutting production time and increasing concentricity.

 

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