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
WICK-TIMER
To limit flight free-flying models are often used machines with wicks. The thread connects the hooks of the fuselage and the stabilizer, locking them in the position required for the...
WINNING LINES
Kind the debut of this model yachts was held in the summer of 1981 at the Moscow city competition modelers. Attention athletes was attracted by the unusual hull shape: broad grancey...
