The next step is to cut the threads on the top and bottom piece of the box. This is one of the most critical steps that must be precise.
- Use the French scraper keeping the handle up (figure A) to finish the hollowing. Sand the wood with 150 and 220 grit sandpaper along with non-woven abrasive pads. Apply the finish, which is a mixture of shellac and wax. Burnish the finish with a dry rag (figure B).
To cut the threads, use a machinist collet and cutter wheel (figure C). Thread the chuck onto the other end of the lathe. Use the dial (figure D) to advance forward as the cutter is spinning by hand. Advance the dial into the cutter 40 thousands to cut threads (figure E). Back the cutter off when you touch the shoulder.
Take the collet and the cutter wheel off the lathe. Next, place the wood in between the chucks to start the hollowing process.
Use a dial caliber to measure the outside of the threads (figure F), then lock the jaws at that measurement. Place the jaws next to the wood, then spin the wood to make a mark (figure G). Hollow out the wood between the marks.
Use a depth gauge to measure the depth of the shoulder on the bottom piece. Add 1/8 inch to that measurement to ensure clearance when cutting the shoulder. Next, use a square end scraper to cut the inside shoulder of the top piece (figure H). Check the width of the opening.
Finally, turn the inside threads.
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![PHOTO](javascript:popup("http://img.diynetwork.com/DIY/2005/01/31/dwtt103_3fh_e.jpg",350,450))
