1) For the lattice you will need a piece of timber 50mm diameter by 8mm thick, a reasonably tight grained timber is best, I am using Lemonwood, and for the jig you will need a piece of timber or MDF approximately 100mm diameter by 20mm thick (photo 273) You will also need a scrap timber for mounting to the lathe.

http://www.getwoodworking.com/members/images/2979/Gallery/my_work_273_(Small).jpg

2) On the Jig timber first mark the true centre followed by a second centre (the lattice centre) this point is half way between the centre and the outside edge. This can vary depending on the centre you require for the grooves. (photo 274)

http://www.getwoodworking.com/members/images/2979/Gallery/my_work_274_(Small).jpg

3) Next mount the scrap timber to the lathe, face it up then using hot glue stick the jig to the scrap timber on the lattice centre, (photo 274) then at a speed you feel comfortable with, turn a recess to loosely accept the lattice blank, (photo 281) the higher the speed the better but be aware that the timber is rotating off centre so the lathe may shake violently if it is not fixed down. (be aware excessive turning like this may cause the bearings to wear,)

http://www.getwoodworking.com/members/images/2979/Gallery/my_work_281_(Small).jpg