Copyright © 2019 Burnham-
Chris’s demo was based on off-
The objective was to create a 6” diameter sycamore bowl with 6 identical indented bowls in the top. The first task was to mark out the 5 equal segments at 72 degree spacings and then mark a 2” circle around the centre which would define the centre points for the 5 outer bowls.
The bowl was then mounted in an ingenious jig which enabled the bowl blank to be screwed in place such that the whole assembly was then more in balance to enable a higher lathe speed than would otherwise be the case.
To mount the bowl blank the jig baseplate was mounted in the headstock and then with one of the bowl centre points precisely aligned with a sharp pointed revolving centre in the tailstock, the bowl blank could be held in place in place with a 2 or 3 screws.
The first bowl (13/16” diam) could then be carefully turned out to the required depth using a 3/8” bowl gouge, checking with a simple pre-
Top Tip 1 -
Top Tip 2 -
Top Tip 3 -
Having turned the first hole, remove screws, reposition the blank on the next centre mark using the revolving centre in the tailstock, replace screws, remove tailstock and turn the next hole. Repeat until all 5 identical holes have been turned.
Mount the bowl blank against a backplate with the centre point held by the tailstock and screw through the backplate to hold the blank. Drill using a depth mark (less than the depth of the subsequent middle bowl!) to enable the blank to be held on a screw chuck in order to turn the bottom of the bowl blank.
With the blank mounted on the screw chuck And supported by the tailstock …
Top Tip 4 -
Top Tip 5 -
Remove from the screw chuck and remount on the spigot. Mark and turn the centre bowl as for the other 5 and then add a bead on the edge to cater for a lid if required and then sand the top face.
Remount on a faceplate held very gently on the tailstock. With the flute of the gouge absolutely horizontal tidy up the edge of the foot and then hollow out the foot to remove the centre dot. Finally, mount a sanding arbour to remove the pith from the foot.
The finished bowl could be used for eggs or earrings for example. If used for earrings then the centre bowl could be replace with a post and cross piece for necklaces. A lid could be added to engage against the bead on the top face.
An excellent demo with lots of useful tips illustrating that patience, planning, precision, care and good technique will produce an attractive and useful object. Thanks again Chris.