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
BUILDING A CAR
When vehicle type is defined: scheduled its approximate dimensions, weight, number of seats in the back, the engine, comes perhaps the most important stage of design development of the...
Diagnostic voltmeter
The operating life of lead acid batteries largely depends on their proper operation. According to technical conditions, it is unacceptable to discharge one section below 1.7-1.8 V....
