Step 3: Shape oak on lathe
Mount the oak block on your lathe being careful to match your 1/8" center hold to each side of your lathe (spindle and tailstock).
Turn the piece on the lathe and slowly remove material. Use the smaller chisels to remove material until you transform your octagon block to a rough disc. Stop periodically to ensure you are not removing too much material by checking the circle that you drew on the face of the block using a compass. You want the finished disc to be approximately the size of the circle that you drew.
Always remove material from left to right (or right to left) and in a uniform fashion across the face you are cutting.
When you have chiseled the block to a disc, use 150 or 220 grit sandpaper to smooth the disc, but be careful to leave fairly sharp top and bottom corners.