|CEILING PLATES - BASES FOR LIGHTING|
↓ I marked the centre on each square and drilled an 8mm hole.
↓ I sanded off the corners using my home made sander.
↓ Much drilling and sanding later.
↓ I made a clamp to secure the squares to the faceplate.
↓ I inserted the square between the clamp and faceplate.
↓ I used an 8mm drill to line up the square on the faceplate, then I tightened the clamp with a spanner.
↓ I used a 48mm Forstner bit to machine the recesses.
↓ I mounted the Forstner bit in a chuck in the tailstock.
↓ The advantage of rotating the work on the faceplate is that I can clear the debris from the Forstner bit without having to keep stopping the lathe.
↓ After I finished cutting each recess, I thoroughly cleaned the bit with wire wool to remove any gluey wood residue.
↓ Here is one square with the recess done.
↓ A lot of time and effort later.
The assembly is clamped and held by the M8 nut.
The 48mm steel disc is a good snug fit in the recess in the MDF.
The M8 nut and steel disc combine to press the MDF tightly against the outside of the chuck jaws.
The arbor holds the square super rigid in the chuck. I'm pleased about this.
↓ I turned down the twenty squares and made them circular.
↓ I put a rough radius on a short piece of tool steel by hand grinding it on the Clarkson.
↓ After doing about 5 bases I got the hang of it and the grooves started to turn out all the same.