Instruction Example 07.1.: Stool Plate

The polishing of wide surfaces by grinding as a first step for further surface treatment (dulling, varnishing) is carried out on a glued board of solid wood.

Material

a glued board of solid wood

length:	480 mm
width:	480 mm
thickness:	20 mm

Figure

Machines and tools

Normal belt grinding machine, sand belt with a corundum NK 25 or NK 32

Measuring and testing means

Folding rule

Necessary basic knowledge

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

Sequence of operations	Comments
1. Placing and fastening the sand belt with a selected corundum NK 25 or NK 32	Abrasives of normal corundum, abbreviation NK, are applied with the grinding of soft wood. The grain size 25 or 32 results in the necessary smoothness of the wide surface.
2. Placing the piece of work and adjusting the height of the sliding table.	The distance between the piece of work and the sand belt should be approximately 5 mm.
3. Switching-on the machine.
4. First grinding Grinding of wide surfaces across the grain	The wide surfaces are grinded by co-ordinated movement of the sliding table cross the sand belt and the pressure shoe lengthwise to the sand belt.
5. Second grinding Grinding of wide surfaces with the grain.	Sticking out wooden fibres and remnants of previous treatment are removed by grinding.
6. Switching-off the machine.
7. Checking the ground wide surface.	Checking is carried out visually and gently rubbing over it with the hand. Thus uneven-nesses can be determined.

Finishing

Grinding of narrow surfaces manually, chamfering the edges. Application as a stool plate.