Back to Home Page of CD3WD Project or Back to list of CD3WD Publications

		Working on Grinding Machines (Institut für Berufliche Entwicklung, 12 p.)
			(introduction...)
			Preliminary Remarks
			Instruction Example 07.1.: Stool Plate
			Instruction Example 07.2.: Stool Plate
			Instruction Example 07.3.: Stool Plate
			Instruction Example 07.4.: Door-Frame

Instruction Example 07.4.: Door-Frame

Polishing of the wide surfaces by coarse and fine grinding is carried out on a frame of solid wood.

Material

frame of solid wood

length:

800 mm

width:

560 mm

thickness:

24 mm

Figure

Machines and tools

Normal belt grinding machine, sand belt of medium corundum EK 25 or EK 32, sand belt of fine corundum EK 20 or EK 16.

Auxiliaries

Free hand grinding chunck

Necessary basic knowledge

Manufacturing of frame joints, manual wood working - polishing and grinding

Sequence of operations

Comments

1. Placing the sand belt of medium Corundum EK 25 or EK 32.

When placing the sand belt it should not be split and not be torn at the edges.

2. Grinding first the wide surfaces of the frame. Use a free hand grinding chunck.

Be careful when grinding the narrow framing timber. The pressure shoe topples over at the edges, better to use a free hand grinding chuck here.

3. Placing a sand belt of fine corundum.

The grain size is selected according to the hardness of the material to be ground.

4. Grind once more the wide surfaces of the frame. Use a free hand grinding chunk.

By the repeated grinding the necessary smoothness for further treatment of the surface is reached.

5. Checking the ground surfaces.

The wide surfaces should be evenly polished and the traces of previous working steps must be ground off.

Finishing

Grind the narrow surfaces manually, chamfer the edges.

Application as a door-frame for a tool cabinet.

Sequence of operations	Comments
1. Placing the sand belt of medium Corundum EK 25 or EK 32.	When placing the sand belt it should not be split and not be torn at the edges.
2. Grinding first the wide surfaces of the frame. Use a free hand grinding chunck.	Be careful when grinding the narrow framing timber. The pressure shoe topples over at the edges, better to use a free hand grinding chuck here.
3. Placing a sand belt of fine corundum.	The grain size is selected according to the hardness of the material to be ground.
4. Grind once more the wide surfaces of the frame. Use a free hand grinding chunk.	By the repeated grinding the necessary smoothness for further treatment of the surface is reached.
5. Checking the ground surfaces.	The wide surfaces should be evenly polished and the traces of previous working steps must be ground off.