Friday, October 8, 2010

The Turning Box

I have already mentioned that this is the best plaster mold making book in the whole world. This post is about the turning-box that is described in this book.

Plaster Mold and Model Making.
Charles Chaney and Stanley Skee.
NY: Van Nostrand Reinhold, 1978.
ISBN: 0671764675

The turning-box is described on pages 106 and 107 of Chaney & Skee. This is an assembly view of the turning-box.

This is a very simple device for turning forms in plaster. How it works is that a template is cut out which is half the shape of the final form. Plaster is built up on the rod until it is scraped off by the template, and takes the full form.

The turning rod is hand-cranked. It can be wrapped with wire to better hold the plaster during the build-up and scraping of the form against the template.

This diagram shows how the pieces fit together.

The top edge of the template must be equal with the center of the turning rod for best results.

This diagram shows an idea about using CD Jewel Box covers as the template for making a set of balls to be used for making plaster ball molds. The ball molds would be used to cast carving wax balls for designing and making ball joints for BJDs. The set of balls would be incremented by specific amounts, like every 1/8th of an inch, from 1/2 inch balls up to 2 inch balls, or whatever is needed. For example: 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8, 1-1/2, 1-5/8, 1-3/4, 1-7/8, 2. If I start with the smallest size, I can use the same template for all the balls. I will just cut out the next size larger after making each ball.

This is a diagram for making a plaster mold for a test tube for sockets, and a plaster mold of a set of ball joints
Once each plaster ball is made on the turning-box, it is put in the clay build-up for making a plaster mold. The plaster mold has two pieces. This seems to be a good idea for a BJD maker, so as to always have a good set of ball joints on hand for designing the joints for a BJD.

This is the BEST Joint Design book available:

Zen & The Art Of Articulating Dolls By Using Balljoints.
Copyright Therese Olsen (twigling) 2007.
Released under a Creative Commons License 3.0.

Creative Commons License
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