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close this bookCentring, Drilling Counterboring and Countersinking, Reaming and Tapping on the Drilling Machines - Course: Techniques for Machining of Material. Trainees' Handbook of Lessons
View the document(introduction...)
View the document1. Purpose of centring, drilling, counterboring and countersinking, reaming and tapping
View the document2. Kinds, construction and applications of drilling machines
View the document3. Kinds and construction of centring, drilling, counterboring and countersinking, reaming and tapping tools
View the document4. Clamping possibilities for workpieces and tools
View the document5. Preparation of work
View the document6. Centring, drilling and counterboring or countersinking
View the document7. Reaming and tapping

3. Kinds and construction of centring, drilling, counterboring and countersinking, reaming and tapping tools

The following main tools are applied: centre punch, centre drill, twist drill, counterbores and countersinks (spiral-flute counterbore, 60° and 90° included angle countersinks, piloted counterbore), reamer, tap.


Figure 7. Centre punch


Figure 8. Centre drill


Figure 9. Twist drill


Figure 10. 60° or 90° included angle countersink


Figure 11. Spiral-flute counterbore


Figure 12. Reamer


Figure 13. Tap

The basic construction of the tools to be used differs only in the shape and number of tool cutting edges. The tools to be used can have a parallel shank or a taper shank. The basic construction of the tools can be seen in Figures 7 - 13.

Which tools can be used for reaming a bore, taking the technological sequence of operations into consideration?
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