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BRUCKNER LIVE CENTERS
HEAVY DUTY - MR AND MRG TYPE

Common Technical Features:
  • Housing - High-quality material, forged, therefore uniform grain structure, tensile strength approx. 1,000 N/mm2.  Head and shank hardened.
  • Taper Shank without Bore - therefore it is not weakened.
  • Safety Spigot (German Federal Patent) - acts as an additional safeguard when connecting the center housing to the support ring.
  • High Concentricity - see below.
  • Large precision roller bearings, free from clearance - to absorb the radial and axial force.  No bearings in the taper shank.  The bearing seats in the housing and on the rotating body have a fine tolerance and are precision ground.  The bearings and their seats are selected to fit.
  • Shaft Seal Ring - protects the bearings from dirt, dust and coolant.
Types MR, MRG with tailstock sleeve support ring, centerpoint 60°,75°,90°

Technical Features:
  • Concentricity Runout
    - Type MR  max. 0.008 mm (.0003")
    - Type MRG  max.  0.004 mm (.0002")
  • See below for Technical Data and Dimensions
Applications:
  • If for very high workpiece weights the load capacity of the mounting taper is not sufficient, the center is additionally supported on the tailstock sleeve with a support ring.  A safety spigot safeguards the screw connection of the center housing to the support ring.
  • The support also diminishes vibration and enhances the center's life.
Technical Data:
ID No. Type MR 190 006MR 190 080MR 190 081MR 230 100MR 230 101MR
ID No. Type MRG 191 006MRV 191 080MR 191 081MR 231 100MR 231 101MR
Max workpiece weight daN 10,000 15,000 15,000 20,000 20,000
Max RPM 1200 1200 1200 1100 1100
Supplementary Seal ID No. V80 V80 V80 V100 V100

Dimensions (mm) Types MR and MRG
ID No. Type MR 190 006MR 190 080MR 190 081MR 230 100MR 230 101MR
ID No. Type MRG 191 006MRV 191 080MR 191 081MR 231 100MR 231 101MR
Taper Size MT 6 metr. taper 80 1:20 taper 80
1:10		 metr. taper 100 1:20 taper 100
1:10
d 80 80 80 100 100
D 190 190 190 230 230
IA for angle alpha 60º 77 77 77 88 88
75º 60 60 60 68 68
90º 49 49 49 53 53
ID 157 164 164 200 200
E 230 230 230 230 230
F <180 <180 <180 <180 <180
-When ordering, please indicate:  1) the point angle of the center, 2) the tailstock sleeve diameter within 0.01 mm (.004")

 

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