|Manual Reaming - Course: Technique for Manual Working of Materials. Methodical Guide for Instructors|
In order to guarantee a trouble-free development of the instructions, exercises and practical work it is necessary to prepare this training properly:
The following steps have to be taken:
2.1. Preparation for instructions on labour safety
Prior to the exercises a brief instruction on the proper use of tools and equipment has to be given. This comprises also hints for accident-free work.
The main points are similar to that of the working techniques of Drilling, Countersinking and Counterboring. The respective hints have to be repeated, and some supplementary points concerning the new working technique have to be added.
- Firm clamping of reamer in a tap wrench
- Never turn a reamer in anticlockwise direction - risk of breakage
- Use of lubricants and coolants during reaming processes
- Put down reamers carefully and make sure that they cannot drop
- Never leave the reamer in a hole when interrupting your work
Familiarity with these hints has to be confirmed by the trainees signatures in a control book.
2.2. Provision of the necessary teaching aids
For demonstration purposes during the instructions a vice should be installed at the place of instruction.
The Trainees Handbook of Lessons - Manual Reaming is to be handed out to the trainees in sufficient numbers.
When using the transparencies series of Manual Reaming, check whether they are complete (transparencies nos. 8.1. - 8.4.) and whether the overhead projector is functional.
(Check the operating conditions at the place of instruction and make sure of the proper mains supply!)
Surveys etc. which are to be written on the blackboard have to be completed prior to instruction.
All the tools and accessories for reaming mentioned in section 3 should be kept ready for illustration purposes.
2.3. Provision of working tools and materials
- Sufficient copies of the Instruction Examples for Practical Vocational Training - Manual Reaming must be handed out to the trainees to provide them with the theoretical foundations for the exercises to be carried out.
- The initial materials necessary for the exercises have to be prepared and laid out in sufficient numbers according to the materials mentioned in the Instruction Examples...
- Each trainee is to be provided with a workbench at which a vice is firmly installed (check the proper height of this vice!).
- The trainees workbenches have to be fully equipped with tools and accessories according to the planned exercises.
Recommended basic equipment:
- steel rule, vernier caliper, external micrometer
- steel scriber, marking gauge, centre punch
- locksmiths hammer, aluminium hammer, hand hacksaw
- drills - countersinks 90°, hand reamers (straight and tapered), rivet hole reamers.
- Bench- and column-type drilling machines and the necessary clamping devices (machine vices, holding clamps, C-clamps) must be provided for the necessary preliminary work (drilling and counterboring/countersinking).
- Prior to the start of the exercises, the drilling machines - have to be checked for a good working order according to the points contained in the regulations on labour safety.
2.4. Time schedule
Time planning is recommended for the following training stages:
- introduction to the working technique in the form of instructions
- necessary demonstrations
- calculations for the technological process to prepare the exercises
- job-related instructions to prepare the exercises
- carrying-out the exercises
- recapitulations and tests.
The necessary time share depends on the respective training conditions. The instructor has to bear in mind that waiting times will occur at the machines, if there are not enough drilling machines available. Such waiting times should be bridged by minor subject-related tasks.