/sci/ - Science & Math

Showing off one of the difficulties in trying to shape a de laval nozzle. Hammering and cold working.

One way to do it is to shape two cones and join them in the center. Trying to work a pipe down to such a small diameter results in cracking and cracking can lead to explosions.

Other methods suggested are pinching a pipe. Best way I can think of doing this is with shaped high pressure rollers. This also draws the material a lot resulting in thinned walls and work hardening.

Best way is to machine it from a solid lump but this is costly and requires a quality machine.

It can possibly be accomplished with thin sheet metal to get the correct shape with a heatsink insulation to improve strength.