If you reverse turnings to clean up the bottom it is helpful to measure the depth and mark the measurement on the outside of the vessel.With this reference, it is easier to make the thickness of the bottom consistent with the walls.
Come join us at the Connecticut Valley School of Woodworking Open House at the Manchester Woodcraft. Saturday September 8th from 9AM-3PM. Vendors, demonstrators & exhibits. Lie Nielsen Tools will be there!