Wednesday, May 5, 2021

The Music Box Project, continued-Planning the Turn

 Hi All,

Well, the music box has arrived:




The gold finish looks really nice.

The music box has a few challenges. It has to be wound from the underside of the box, which is round inside and out. The round shape means the mechanism will have to sit on a flat surface that will be partly created by turning and also with the insertion of a very thin piece of wood. Also attachment points for the lathe have to be created as the upper portion of the music box will be turned and the bottom will be drilled and turned. And it will have a lid on the top to keep out dust. A small box but challenging.

Here's some photos:

The block is a nice size for this. It's 5 1/2" high x 4 5/8" and it's held between centers on the lathe:



I originally wanted to make the box with a flared top and a narrow bottom but the music box mechanism dimensions prevent that. In order for the mechanism to fit, the base will have to be wider and for a time that really threw off the design. Eventually I settled for a wider flare at the top and a wider base at the bottom. I will need to remove about 1 1/2" of wood off the bottom.

There are two sets of "ledges" inside the box-the upper ledges for the lid to sit on and the lower ledges for the mechanism platform to sit on. The platform is in pink on the drawing. If my measurements are correct, this is going to be a tight fit for the mechanism key underneath and I may have to place the platform higher inside of the box than this drawing shows to all for this and to allow for small screws to hold the mechanism in place. This is to be determined as the turn progresses.



Since there are multiple parts of the box and some parts will be created as the turning progresses, a turning plan is needed:

1. Turn and shape the outside completely, including sanding.

2. Create the bottom first: drill and turn the opening at the bottom 1 7/8" wide x
1 1/2" deep.

3. Sand the inside of the bottom. Remove approximately 1" - 1 1/4" of wood off the exterior wall. Make sure the bottom is completely flat.

4. Turn the block over and turn the interior-remember to leave the ledges for the lid. 

5. Sand the interior  completely.

6. Create the lid out of hard maple with a rosewood finial.

7. Apply a polyurethane to the box and lid.

8. Insert the inside platform (I'll talk more about how I'm going to make this a bit later on) and screw in the mechanism.

Ok, I'll begin the turn tomorrow.

See you then,
VW

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