Holes 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 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
THE SAND IN THE ROLE OF THE PRESS
In the manufacture or repair of products in the home often have to glue the parts (and more parts) of various materials relevant brands of glue, good in selling their great variety —...
RELIABLE CLOTHESPIN
Instead of the usual wooden pegs were the same, but the plastic that slid more than the former and thus hold somewhat worse. To increase their reliability can be invested inside as shown...
