An egg will not crack if you prick the blunt end before you drop it into boiling water.
There are no dimensions supplied for this pricker as size is not important. An ovoid shape is appropriate and a flat base is used.
1. Turn this shape between centres. Angling the parting tool allows for a neat fit of the two halves.
2. Separate A and B.
3. Drill A and B ion the lathe to suit the dowel, say ½ " and make B slightly deeper.
4. Make two dowels, one for the pin and the other for a jig. The pin should protrude 2 mm and this end of the dowel is sanded so that it is an easy fit into the hole on the other half of the "egg" . The other end will be glued into A. The jig-dowel should be a tight jam fit.
5. Chuck both halves on the dowel jig, cut off the spigots, sand and finish. Check the pin-dowel for a sweet fit and sand if it is tight; coat it with lacquer or glue if it is too slack.
Relax ---- this one's really a lidded pot. The spigots on the end are to fit the small jaws of a Vicmark chuck, the small flanges are to ensure exact centering when re-chucking. Make yours to fit your gear.
Shaft R is short This end is parted off last to leave a flat base to the egg. Does not need room for skew chisel. Shaft L is longer to leave room for skewing up to final parting off
SEQUENCE
1. Turn cylinder.
2. Turn as to diagram.
3. Part off at C. Note trace left on RH side- don't part off L & R. yet
4. Re-chuck L., clean up face and drill hole - 1/16" to correct depth for pin.
Grind pin head if necessary, glue in with R V, A.
5 . Re-chuck RA turn out lid. Note dimple for pin. Keep testing with L. for firm fit. (Helps with sanding later)
6. Push two halves together & re-chuck the lot.
7. Sand whole to finish, Coarse sand on join of lid if not "sweet"
The sander is ideal for this.
8 Skew off L. end & part it, then finish/polish the lot.
9. Part off R.'& finish/polish the flat end by hand.
Note: An egg has an "air" sack at one end. The pin length is about 2mm to penetrate the shell but not the inner membrane. Pressure is relieved and you won't have cracked boiled eggs.
