DRILL BUSHINGS - Locking Accessories For Renewable Bushings

  • AIR FEED DRILL BUSHINGS

                                       TECHNICAL INFORMATION

FOR FAST, ACCURATE MOUNTING OF 
MECHANICAL/AIR-FEED DRILLS, TAPPERS AND BACK SPOTFACERS

Our Drill Bushing Tips provide a fast, accurate method for portable/stationary mounting of drilling, tapping and other self-contained machining units on a jig/fixture. The threaded end of the drill bushing tip screws into the nose end of the drilling unit. The helical flanges on the tip fit under the shoulders of the lock screws/lock strips on the jig, effectively holding the drilling unit in alignment position and absorbing drilling thrust and torque.

Our Drill Bushing Tips are finished to order to the drill size specified by the user. They are available for applications from No. 70 drill up through 1-15/32" diameter.

 Our Drill Bushing Tips and Accessories fit all standard automatic feed drill motors including Gardner-Denver, Keller, Aro, Buckeye, Quackenbush, Ingersoll-Rand, etc.

 

 

 
OUTSTANDING FEATURES
1 Drill guide hole finished to ANSI specifications/customer's exact dimensional requirements.
2 Chip clearance hole prevents jam-up of chips. Chips work back into the nose piece and out slots in sides of nose piece.
3 Milled slots give quick, positive lock of drill bushing tip under heads of lock screws. A 30o turn locks/unlocks the drill bushing tip.
4 Square shoulder and concentric alignment diameter accurately line up drill bushing tip with axis of tool.
5 Collar and threads are heat treated to produce strength and provide wear resistance. Shank is hardened for maximum wear resistance.
6 Marked with part number and drill size for easy identification and simplicity in reordering.
7 Precision ground shank, with entering bevel for easy insertion in lock liner bushing.
8 Collar has blackened finish for resistance to rust and corrosion.		  

 

Automatic mechanical/air-feed drills, tappers and back spotfacers are equipped with either a short/a long nose piece depending upon the length of the cutting tool holding device - i.e. drill chuck, tap chuck, morse taper adaptor, etc. Reducer bushings are occasionally used to reduce the thread size in a specific nose piece to adapt it to accommodate smaller thread drill bushing tips. Close fit between mating shank of tip and hole in lock liner bushing holds tool in alignment to produce straight close-tolerance holes.

Construction: All drill bushing tips are constructed by a two--piece method consisting of a collar and a pressed-in shank. The collar contains the screw threads, alignment diameter and the lock flange. The shank contains the A, B, and dimensions listed in the chart. Maximum and minimum drill sizes (A) for drill bushing tips are shown in the column headings of the chart. Collars/shanks only of two-piece drill bushing tips may be ordered separately for replacement purposed: (See "ordering Information.")

Mounting data

Conventional method for mounting automatic, mechanical/air feed drills, tappers and back spotfacers to a jig/fixture. A hole is bored in the jig to accommodate the lock liner bushing. The lock nuts hold the lock liner bushing in position the jig. An alternate mounting method for holes so closely spaced that lock liner bushings cannot be used has lock screws mounted directly in the jig. The shank of the drill bushings are available to press into the bored hole to provide a wearing surface and prolong the useful life of the jig. A second mounting method for closely spaced holes employs a lock strip along each side of the row of holes in the jig. The flanges on the drill bushing tip lock under the extended edges of the lock strips when the tip is turned 30 degrees to the left. Headless liner bushings pressed into the bored holes in the jig are recommended to forestall wear in the bored holes. 

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