Copyright © 2019 Burnham-
A fully recovered George, although he was still playing for the sympathy vote!, demonstrated the techniques involved in making a bowl with 5 symmetrical indents/hollows.
Using a wood that most of us had not heard of, Capricious Macrocarpa, similar in look and smell to Cedar, on one side of the 6” blank was pasted the template for the off-
Because of the extreme off-
George stressed that the success of the project is very dependent on the accuracy of the template and the accuracy in mounting the faceplate in the various off-
Note that the circles are of the same 3” diameter of the faceplate.
After fixing the faceplate to the dead centre of the blank, the blank was turned down to 6” and the end face flattened off and sanded down to 400grit as the this would not be possible once the indents had been made.
The faceplate was then fixed to one of the circles avoiding using all the screws other than the one closest to the outside of the bowl to avoid subsequent problems with the screw hole when turning the bowl shape.
After mounting on the lathe, a centre in the tailstock was used to mark the centre of the off-
The same process was used to turn the other 3 indents. To help with the balance of the blank, the second indent should be the one opposite the first indent.
The faceplate was remounted on the centre of the blank. Note that the 5 holes in the faceplate are not necessarily equidistant apart so either mark the position of the faceplate when first used, or rotate the faceplate until the holes match with the originals, or fix using new screw holes.
Starting in the centre start to form the central indent, gradually increasing the diameter until the shape looks OK relative to the 4 outer indents.
Finally, reverse mount the bowl using a router mat disk in the chuck, held in place with a live centre in the tailstock, and then the bowl shape and foot were turned in the conventional way.
An interesting demo which illustrated the many possibilities for variations in design such as triangular configuration …
Finally, another 4 indent design using walnut which gives the optical illusion in the picture that the indents are raised! …
Thanks to George for an interesting demo and, as ever, an entertaining demo.