ISPEInternational Pipe Encyclopedia

Materials

Shaping Before Drilling

A workshop method in which the pipe body is shaped before its holes are opened: freedom to design around the grain, offset by the alignment challenge of freehand drilling and the solutions developed for it.

Shaping before drilling is a workshop method in which a pipe body is shaped before the chamber, airway, and mortise are opened. The usual order is the reverse: the block is mounted on the lathe, the three holes are drilled while the body is still rough, and the shape is then built around those axes.

Because reversing the order changes both the design decisions and the workshop routine from the ground up, the method counts as a distinct specialty within pipe making.

Shape Led by the Grain

The rationale is the grain. Both the pattern of a briar block and the sand pits, cracks, and voids within it only become visible as the surface is opened up. If the holes are drilled first, the shape stays tied to those axes; working around a flaw that appears during cutting, or capturing the line where the grain looks best, is only possible within a narrow margin. When the shape comes first, though, the maker can choose a new direction every time the saw and sanding disc reveal a new surface. This is why the method is associated with freehand designs, in which the block itself determines the shape, and with the Danish school tradition. The cost is a narrower margin for correction: while roughing out the shape, care must be taken not to end up with a body that can't be drilled at all, and to leave enough material for fine shaping once drilling is done.

Achieving Alignment

The Rest of This Entry Is in the App

The full ISPE opens with your IPC account.

Open in the app

Related Entries

Last updated:

Source: Pipedia, adapted under the CC BY-SA licence.