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
VOLGA CARDI
When an artist falls in tough conditions restricting the freedom of his work, this sometimes leads to the most advantageous solutions. For several decades, the designers of the Gorky...
FLYER AS OPPRESSION
It is known that all the pickles are well salted and maintained, if on top of them has any oppression: a rock Bank with water. However, it is possible to dispense with traditional...
