AND DRILL AND COUNTERSINK BIT

DRILL BIT, AND COUNTERSINK BITHoles in wood, plastic or duralumin parts are usually done in two steps: first, through drilling, and then chamfering with the core drill or drill bits of large diameter. I suggest a simple device that allows you to combine these operations.

A device for simultaneous drilling with chamfer
A device for simultaneously drilling with chamfer:
1 — mandrel, steel 40H, 2 — cutter, 3— check, 4 — fixing screw M4

 
A small chisel made from a piece of drill or tap is fixed on the working tool by means of a spindle with a diamond-shaped hole. After the drill bit deepens the distance specified by the position of the cutter, the edge is removed chamfer.
 
And, ALIMOV, Moscow

Recommend to read

  • URAL VEHICLES FROM the VMS TO the “URAL”URAL VEHICLES FROM the VMS TO the “URAL”
    The decision of the State defense Committee on the construction of the Miass automotive factory was taken on 30 November 1941. At that time in Miass have already arrived some of the...
  • IN BATTLE WINS DESIGNER…IN BATTLE WINS DESIGNER…
    The lightest balsa frame, powerful nitro engine made with your own skilled hands and is able to "pull" almost weightless Model in almost all its evolutions... Are models of air combat's...