|Driling, Countersinking and Counterboring - Course: Technique for Manual Working of Materials. Instruction Examples for Practical Vocational Training|
The present material includes 6 selected instruction examples by means of which the essential operations of drilling, countersinking and counterboring can be practised.
For that purpose, through-hole and bottom-hole bores, holes on flat and inclined surfaces as well as counterbores and countersinks will be made.
Apart from the mere exercise of drilling, countersinking and counterboring on a special workpiece, the jaws for round material, the drill stand as well as the rivet set and the rivet header can be used in the workshop. The rotary head for a threaded spindle is a single part of a C clamp; the bottle-opener can be used by the trainees themselves.
In order to facilitate the preparation and execution of works, the required materials, working tools, measuring and testing tools as well as accessories are given for each of the practical examples. Furthermore, the previous knowledge is mentioned that is necessary for executing the exercises.
In addition to the working drawing attached, a favourable sequence of operations is described.
Explanation to material data:
Steel grading is as to the value of tensile strength given in the unit Megapascal (MPa).