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CLOSE THIS BOOKCentring, Drilling and Counterboring / Countersinking - Course: Techniques for machining of material. Trainees' handbook of lessons (Institut fr Berufliche Entwicklung, 22 p.)
VIEW THE DOCUMENT(introduction...)
VIEW THE DOCUMENT1. Purpose of centring, drilling and counterboring/countersinking
VIEW THE DOCUMENT2. Types and application of centring, drilling and counterboring/ countersinking tools
VIEW THE DOCUMENT3. Preparation of centring, drilling and counterboring/countersinking
VIEW THE DOCUMENT4. Centring with the centre square, centre bell and height gauge
VIEW THE DOCUMENT5. Centring with the centre drill
VIEW THE DOCUMENT6. Centring with the turning tool
VIEW THE DOCUMENT7. Drilling with the drill and boring with the boring tool (turning tool)
VIEW THE DOCUMENT8. Counterboring/countersinking with counterbore/countersink and turning tool

8. Counterboring/countersinking with counterbore/countersink and turning tool

Counterboring/countersinking with counterbore/countersink and turning tool is a finishing operation on the internal surface of internally premachined rotationally symmetrical parts. Counterboring/countersinking on the lathe with special counter-bores/countersinks is of minor importance. Essential advantages are achieved by counterboring/countersinking on the lathe with the turning tool which results in higher surface finish and dimensional accuracy with less tooling costs.

- The cutting is done by turning tools using counterboring/countersinking tools (see Fig. 5, 6, 14 in section 2).

- Combination tools (piloted counterbore, step countersink, combination countersink) can be economically used since several operations are combined into a single one.

- Counterbores/countersinks with straight shank are chucked in a drill chuck; counterbores/countersinks with taper shank are inserted in the taper hole of the sleeve.

- When working with the counterbore/countersink, a relatively low speed rate is to be selected to avoid chatter marks (scratches, grooves).

- During counterboring/countersinking of parts made of steel, cast steel, red brass or light metal, coolants or lubricants are to be used to improve the surface finish.

Chips must never be removed by hand - danger of accidents!

What are the advantages of step countersinks and combination countersinks?
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Why is the counterboring/countersinking technique on the lathe with special counterbores/countersinks of minor importance?
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