|Grinding of Simple Tools - Course: Technique for manual working of materials. Methodical guide for instructors (Institut für Berufliche Entwicklung, 19 p.)|
In order to guarantee a trouble-free development of the instructions, exercises and practical work it is necessary to prepare this training properly.
This includes the following measures:
2.1. Preparations 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 hints for accident-free work too.
The following main subjects have to be imparted to the trainees:
- Only one trainee must work at a grinding
machine at a time.
- A safety distance of at least 1 m around the grinding machine is to be observed.
- A trainee at the grinding machine must never be distracted, pushed or teased.
- The conditions of safety at the grinding machine have to be permanently checked:
· maximum distance of grinding support 1 - 2
· distance of spark killer 5 mm (maximum)
- Grinding machines without attached eyeshields must be operated with the safety goggles on,
- Never grind the tools without the guidance of the left hand.
- Grinding wheels must be stressed frontally only - no lateral stress is allowed.
- You must never wear gloves or use pieces of cloth when holding the tools during sharpening.
Familiarity with these hints has to be confirmed by the trainees signatures in a control book.
2.2. Provision of teaching aids
The "Trainees' Handbook of Lessons - Grinding of Simple Tools" has to be handed out to the trainees in sufficient numbers. When using the transparencies series of "Grinding of Simple Tools" check whether they are complete (transparencies nos. 12.1. - 12.3.) and whether the overhead projector is functional. (Check whether the operating conditions are appropriate on the spot and make sure of the proper mains supply.)
Surveys etc. which are to be written on the blackboard have to be completed prior to the instruction.
All the grinding wheels and tools to be sharpened 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 - Grinding of Simple tools" roust be handed out to the trainees to provide them with the theoretical foundations for the exercises to be carried out.
Based on the materials listed in the "Instruction examples ..." the initial materials necessary for the exercises have to be prepared and laid out in sufficient numbers.
For simple repair work or the production of tools the workbenches of the trainees have to be provided with firmly installed vices. The instructor has to check whether the workbenches are fully equipped with tools and accessories - based on the planned exercises - if other repair work or the production of new tools is planned in addition to sharpening.
Recommended basic equipment:
- vernier caliper, protractor, grinding
- steel scriber
- hand hacksaw, locksmith's hammer
Based on the number of trainees a sufficient number of grinding machines (bench-type and pedestal grinding machines) is to be provided.
For the purpose of off-hand sharpening of tools made of tool steel, flat wheels made of corundum must be available.
Tools with carbide cutting edges require flat wheels made of silicon carbide.
2.4. Time schedule
Time planing is recommended for the following training stages
- introduction to the working technique in
the form of instructions
- necessary demonstrations
- job-related instructions for carrying out the exercises
- carrying out the exercises
- recapitulations and tests.
The necessary time share depends on the respective training conditions. The biggest time share is to be allocated to the exercises.