4. Application of the working technique of “Manual Sawing”

The sequence of exercises can follow the order of the 7 (or 6)

Workpieces mentioned in the “Instruction Examples for practical vocational training - Manual Sawing”.

These “Instruction Examples...” comprise a list of materials (initial materials, hand tools, measuring and testing tools, accessories) as well as the sequence of operations for manufacturing these workpieces. Thus, the trainees avail of the necessary information to begin their exercise-related work.

Should the quality of the manufactured workpieces be considered insufficient, the trainee has to carry out comprehensive preliminary exercises. To do so, any waste components will do.

If the skill has been practised sufficiently, the envisaged workpiece can be manufactured.

The following hint should be taken into consideration:
The trainee has to do all the work alone - from the very beginning (cutting of initial material) till the completion of the workpiece.

This is the only way to guarantee a just evaluation of the achievements. Should the offered “Instruction Examples...” not be used in the exercises, then it is also possible to select other workpieces. In this case all the working techniques acquired earlier should also be practised with these workpieces.

4.1. Instruction examples

What follows is a brief description of the individual training examples in order to give a survey of those workpieces on which the previous knowledge is to be verified:

Instruction Example 4.1.
Spacers and Pin Drifts

Figure

Flat steel and aluminium sheets as well as round material of copper and brass are used to practise simple, straight saw cuts. The finished parts can be employed as necessary accessories in workshops: spacers for clamping, pin drifts for loosening pin connections.

Instruction Example 4.2.
Stands and Supports

Channel sections and steel tubes serve to practise the specific skill of cutt-off sawing. Repeated re-clamping of the workpiece is a must.

Figure

Channel can be further worked in order to manufacture drill stands etc. The instruction examples 2.3. and 7.4. give a description of continuing this work. The tubes can be prepared in such a way that they can serve as supports for instruction example 4.6.

Instruction Example 4.3.
Container

Figure

Light metal or steel sheets or tubes will be sawn to given dimensions to practise mitre cuts. After glueing, soldering or welding, these components can serve as containers for pins or scribers.

Instruction Example 4.4.
Vee-shaped-Attachment

Figure

Steel sheet will be cut to size by long and straight sawing cuts; solid square steel will be sawn by mitre cuts (the required angle will be given by the instructor).

After-having connected these components by bolts or rivets this workpiece can be used as accessory for clamping cylindrical workpieces.

Instruction Example 4.5.
Steel Square

Figure

Long and straight sawing cuts of high precision are practised on steel sheets. Once completed, the workpiece can be used in the workshop.

Instruction Example 4.6.
Angle-Steel Frame Table

Figure

Straight and mitre cuts serve to practise the technique of joining angle steel to form a frame. Emphasis is to be laid on the peculiarities of straight and mitre cuts. Welded with the supports mentioned in instruction example 4.2., a frame for a table is produced which can be provided with an insert (of steel or wood) so as to form a table for putting down tools etc. in the workshop.

Instruction Example 4.7.
Wall-Shelf-Bracket

Figure

Angle steel is used to practise mitre cuts and cut-outs.

When combined with other working techniques, a set of brackets for wall shelves can be produced.

These brackets can be bolted into the wall and provided with a board of any length - and this results in a useful and solid place for laying down workshop accessories.

4.2. Criteria for practical training

It is recommended to determine some major points of observation and evaluation of the work performed.

The following criteria may serve as a guideline:

Does the trainee select the appropriate saw blade?

Does he fix the saw blade in the proper way (in the pushing direction)?

Is the workpiece clamped as required?

Does the trainee use available accessories?

Does the trainee employ cutting oil for sawing?

Does the trainee pay attention to vertical guidance of the saw?

Does the trainee re-clamp sections during sawing or does he saw off in one pass?

Does the trainee pay attention to the fact that there must be as many teeth as possible cutting at the same time even when sawing thin workpieces?

Does the trainee’s tool comply with the labour safety requirements?