Geometric+stairs

Geometric stairs contain specialised stair components including:
 * Curved strings - cut and closed
 * continuous handrailing - including wreaths, goosenecks and other handrail turns
 * bullnose treads and rises - used at the bottom of stair flghts
 * scrolls - shaped handrail ends lowest treads
 * brackets - used to decorate cut well string facings



The geometry involved in setting out wreathed strings and handrails is fairly complex. You need to consult your trainer or colleagues for more information. The description below is fairly rudimentary but provides the basics of the work.
 * Setting out Wreathed Strings and hand rails**
 * Wreathed string on quarter turn stair flight**
 * 1) Draw plan view of the quarter turn and set out the riser positions
 * 2) Project a horizontal and vertical line from point B
 * 3) Draw a line at 600 through A to line B to find point A1 and a vertical line from B to intersect line A at point C.
 * 4) From C, project lines through the ends of the risers on the plan view until they intersect with the Line B to find points D and E.
 * 5) Project points A1, D and E to find the positions for the face of the risers
 * 6) On line B at a suitable distance up mark off the rise heights project them across to the appropriate intersection points and mark in the shape of the string.

You can download the attached book on special stair components for greater detail on special stair component construction If it takes to long to download try right clciking and choose "save target as" to save the file to your desktop or storage device. There are many other text books which can assist you with setting out stairs and geometric shapes and components. A list is provided below

Barrington, Jack, Dieter Mylius, **Practical Australian Carpentry** : framing and construction. Floors, walls, ceilings and stairs Penguin Books Australia, Camberwell, Vic 2003 Porter, Brian, 1938- **Carpentry and joinery**. Volume 2, 3rd ed. Barry, R. (Robin), **The construction of buildings.** Volume 2, 5th ed. Cole, D., **Stairbuilding** Templer, John A., **The staircase**. New South Wales. Dept. of Education and Training, c2002, **Stairs : types, design and measurement**, ISBN: 0734818254
 * Books**
 * Videos and DVDs**
 * Building stairs** Taunton Press Newtown, Conn. c2004

Handrail bolts are used to join lengths of handrail together to form continuous handrails.
 * Handrail bolts**



Check out this webitse and watch the manufacturing to see how modern Geometric (curved staircases) can be built. The video demonstrates well how curved strings are fomed.

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