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Wood Keyed Adjustable Stretchers

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Wood Keyed Adjustable Stretchers PowerPoint Presentation

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Description : PowerPoint presentation on Wood Keyed Adjustable Stretchers, download now ppt of Wood Keyed Adjustab... Read More

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Published on : Jan 08, 2015
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Slide 1 - How to Adjust a Wood Keyed Stretcher Using Wooden (wedges) Keys and Why. The John Annesley Company home
Slide 2 - Why? Loose canvas All fabric expands and contracts due to hot and cold temperatures. During the course of the day, as the temperature fluctuates, and the fabric expands and contracts. The wood is also expanding and contracting with the ambient moisture in the atmosphere. The force of gravity is pulling constantly. The combination of these forces will cause the fabric to fatigue. This occurs primarily along the edge of the canvas where the canvas and the stretcher make contact. To remedy this problem, you have three options: You can re-stretch the canvas, which is the best option. You can expand the stretcher bar, there by tightening the fabric. A wood keyed stretcher allows for independent expansion in either direction in each corner. You can shrink the fabric, making it tighter, by using moisture (water). Each time this method is used, you reduce the elasticity of the fabric. home
Slide 3 - Tools and Materials Needed Awl Small Hammer Side Cutters Wooden Keys home
Slide 4 - N1 Stretcher (face view) home
Slide 5 - N1 Stretcher (back view) The back side has the stapled corners. home
Slide 6 - Corner Detail Showing Staples home
Slide 7 - Getting Started Pry the staples using an awl. home
Slide 8 - Once the staples have been lifted from the stretcher, finish pulling them out with a pair of side cutters. home
Slide 9 - Staples Removed home
Slide 10 - Corner Detail with Two Wooden Keys home
Slide 11 - Detailed Mortise View home
Slide 12 - First Wooden Key Inserted Insert first key into bottom slot, flat side slides along the inside edge of the stretcher, and into the mortise. home
Slide 13 - Second Wooden Key Inserted Insert second wooden key into top slot, flat side slides along the inside edge of the stretcher, and into the mortise. home
Slide 14 - Making Adjustments Gently tapping this key will cause the joint to move in the direction of the arrow. home
Slide 15 - Making Adjustments Gently tapping this key will cause the joint to move in the direction of the arrow. home
Slide 16 - Detail of Joint Spacing home
Slide 17 - Overview of Wood Keyed Stretchers Advantages Easily assembled and disassembled using minimal hand tools. The corner joints (open mitered, double mortise and tenon) can be expanded independently in each direction. Braces can also be keyed with mortise and tenon joints. home Disadvantages Damage can occur to the painting by striking the canvas accidentally with the hammer while hammering the keys. Keys can break, and become lost between the canvas and the stretcher, causing damage to the painting. Keys can become lost.