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Adventures In Oversize

Shayla

WOW Framer
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Joined
Apr 5, 2008
Messages
31,648
Stretching a 79 x 118 canvas on Richeson heavy duty wood/aluminum stretchers. The canvas is lying flat on sawhorses, and we just tightened the diagonal metal corner tensioners. After stapling all but the corners, we unscrewed the temporary triangular masonite pieces from the corner backs. Before turning the tensioners, we loosened the screws on the cross-brace brackets, so they wouldn't bind expansion during tensioner adjustment. Is loosening those bracket screws something others do before this adjustment, or are they left tight? (We haven't yet stapled the fabric at the corners, as one does at the last.)

After tightening the tensioners, the frame, which was even across the ends and middle after stretching, is now 1/4" narrower across the center. To move it back to good for now, Hubby added a couple of furniture clamps, reversed to work as stretchers, to the underside of the frame. Then, added wooden shims between the back of the center plastic center brace and the frame, to get it back to size. We plan to leave it for several hours to see if the canvas (which was pinned overnight before stretching), relaxes further. Tonight, we'll come back, measure and tighten as needed, tighten the bracket screws and fold/staple the corners.

Feel free to share what you do at these steps, or if you'd do it differently. Thanks.
 
Last edited:

wpfay

Comfort Badger
Forum Support Team
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Joined
Sep 1, 2000
Messages
11,030
Sounds like you have it pretty well figured out.
The use of the plastic mounts for the cross braces is a weak point in the overall design though I'm not coming up with a better simple solution going from the aluminum body of the stretcher to the wooden cross braces. Spreading and shimming works, though it will be more difficult if there are adjustments needed on site.

https://sohoartmaterials.com/tri-mar-stretchers is an option that allows tensioning on all cross pieces. I really like this system except for the wedge tensioning.

An education in stretchers and some other options can be found here: https://simonliuinc.com/stretchers/
 

Shayla

WOW Framer
Forum Donor
Thread starter
Joined
Apr 5, 2008
Messages
31,648
All done! Looks perfect.

Dirk and our son-in-law made a great team, and I came up with some good ideas, too.
We measured it eight different ways, and it's in square within 1/32". Will share pics later. Whew! :beer:
 
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