Sometimes I have to frame many canvases in a stressfull hurry so I built a tool to help me with that. It was actually pretty easy to make and it works really well.
Just take four planks of the same length and pair them together so you get one on top and one on the bottom. Put something that can grip the canvas between the planks. I used ropes and put them so that they meet like the cogs on a cog-wheel when you put the planks together. Drill a few holes for the wing nuts that will press the planks together. Attach more rope so that you can pull the two plank parts towards eachother and thus stretch the canvas evenly. Then you can build a frame, weeve a canvas and then paint something if you want to.
Happy love and a jolly Christmas to you all!