overview Precision Chamfering Nobur ® JB Automatic Back-Chamfering Tool For back-chamfering or deburring on drill presses, CNC machines, tool or turret lathes, multi-spindle machines and jig boring machines. ■ Consistently accurate back-chamfering, deburring, and back-countersinking operations ■ Pilots in hole for precise concentricity ■ Rigid support of the cutter virtually eliminates deflection ■ Micrometer-stop adjustment ■ Standard pilots and cutters for hole sizes from 3/16 to 3/4” (4.75 to 19.05mm) ■ Special pilots and cutters available upon request 35

Operating Principle Nobur® JB Series AUTOMATIC BACK-CHAMFERING Illustrated below is the basic operating principle for the Nobur® JB Automatic Back-Chamfering tool. 1 Approach Stroke 2 Feed Stroke 3 End of Feed Stroke The Nobur® JB tool is rotating in The pilot locates in the bore, Radial depth of cut is obtained when a machine spindle. The spindle is stopping against the face of the the micrometer-stop nut bottoms lowered to bring the tool into workpiece. As the spindle continues out. Chamfer location is controlled position to enter the bore. to travel, the tool is compressed so by rotation of...

1/2-1 (12.7 - 25.4 MM) RANGE MATERIAL THICKNESS WITHOUT STOP COLLAR EXTENSION STOP COLLAR EXTENSION 1/32 -1/2 (0.8 -12.7 MM) RANGE MATERIAL THICKNESS WITH STOP COLLAR EXTENSION Capacity means the suggested maximum chamfer diameter. Dependent upon cutting forces and bore diameter. Stated Shank is included with head. Shanks other than shown can be supplied upon request.

Bill of Materials Nobur ® JB Series AUTOMATIC BACK-CHAMFERING 1 Body Holder 9 Compression Spring 15 Pilot 2 Stop Nut 6 Ball Thrust Bearing 10 Ball (19/64) diameter 16 Blade 3 Stop Collar 7 Bearing Cage 11 Pilot Retaining Screw 4 Keyed Transport Sleeve 38 5 Retaining Ring 8 Transport Assembly 12 Stop Collar Extension