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In the case of the French stretcher, a mitre joint is used to adhere the corners. "Keys" or small triangle wedges are inserted in the joint after stretching the canvas to give the canvas its final tension. When fastening the canvas, pressure should be distributed evenly around the stretcher to minimize warping due to unequal distribution of pull.
The history of the bar puller begins with the introduction of the NC/CNC lathes in around 1980. At this time lathes were changed to permit inexpensive and economical production of small or medium-sized batches. The bar puller serves to draw bars into the lathe without operators having to feed the machine with material each time it is required.
Most stretcher frames have eight keys, two in each corner. [1] Each key is tapped in to expand the stretcher bars slightly, tensioning the canvas. [1] [2] The keys can be used to re-tighten the canvas as it relaxes naturally over time. [5] If the key is tapped too forcefully, it may tear the side of the canvas. [4]
Strainer bar frames are usually in the shape of a rectangle, although shaped canvases are also possible. [1] A stretcher frame constructed from strainer bars should not be confused with one constructed from stretcher bars. Strainer bars are fixed to one another with wood glue, nails or staples, often in conjunction.
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Manual hole drilling and spike or screw insertion and removal have been replaced by semi-automated or automated machines, which are driven electrically, by pneumatics, by hydraulics, or are powered by a two-stroke engine. Machines that remove spikes are called spike pullers. [32] [33] [34]
Image credits: Sad_Goose3191 #6. A habit I learned from my mom as I grew up that I still do today: we usually had protein, a carb and two side dish vegetables for dinner most nights, and she used ...
Rickshaws were introduced to Durban, South Africa, and by 1904 there were about 2,000 registered rickshaw pullers. [8] [29] [30] Rickshaws operated in Nairobi in the beginning of the 20th century; pullers went on strike there in 1908. [31] In the 1920s, they were used in Bagamoyo, Tanga, Tanzania and other areas of East Africa for short ...
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