by Dick
We previously advocated soft fibre-board for making nest concaves, here. Up until now, we have made these by gluing together two layers of fibre-board to make a blank 25mm thick, then scooping out the concave on a lathe. Here we have a better idea.
A friend of mine has made a tool to be used in a pillar drill. Setting the pillar drill to its slowest speed, 210 rpm, it does a nice job of very quickly excavating the concave, without creating clouds of carcinogenic dust.
The material of the blade is 3mm gauge plate.
It takes less than a minute to scoop out each concave.
We previously advocated soft fibre-board for making nest concaves, here. Up until now, we have made these by gluing together two layers of fibre-board to make a blank 25mm thick, then scooping out the concave on a lathe. Here we have a better idea.
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| The tool mounted above a blank, and the tool in action, right. |
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| The cutting edges are bevelled at 30° |
A friend of mine has made a tool to be used in a pillar drill. Setting the pillar drill to its slowest speed, 210 rpm, it does a nice job of very quickly excavating the concave, without creating clouds of carcinogenic dust.
The material of the blade is 3mm gauge plate.
It takes less than a minute to scoop out each concave.
Note: the diameter 100mm is intended for cutting material 25.4mm (1 inch) thick. For other thicknesses, assuming 2mm is left at the bottom, the diameters would be as in this table. A larger diameter means a shallower concave:
| Thickness | Diameter |
| 12 | 191 |
| 12.7 | 180 |
| 15 | 152 |
| 18 | 129 |
| 20 | 118 |
| 22 | 110 |
| 24 | 104 |
| 25 | 102 |
| 25.4 | 101 |
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