Clamps are used for tight pressing of some surfaces to each other( tightening, gluing).Accordingly, carpentry clamps are used when working with wood, wooden surfaces. For those that are found in retail, the frame is most often made of light metals, and such clamps often bend and become unusable. And the size of such clamps is not more than 2 meters. What if it is necessary for pressing large "surfaces"?Indeed, when gluing, say, the overall sheets of plywood, the quality of the connection depends not only on the clamping force, but also on the uniformity of pressure throughout the plane.
Of course, you can use several clamps. But still it does not guarantee obtaining an excellent result. As an option - to purchase a sliding model, but its cost makes you think about other options. And they are. Consider two, since they are the simplest.
Manufacturing clamp
and materials for the manufacture of home-made clamp( universal, not only the carpentry) with his own hands, we need the channel. Its length depends on the maximum dimensions of the material to be used. It is also necessary to think about the prospect, if you use this clamp often. Along the center line of the channel, it is necessary to mark out the holes for the holes. They will insert a bolt welded to a small piece of the channel( stop).With the help of a welding machine, it is not difficult to cut openings. For a denser "landing" of the abutment, this "nest" must be made drop-shaped( like a keyhole for old door locks).
A small bolt is welded to a small section of the channel. The size of the bolt head must be such that it can be inserted into the socket. Everything, emphasis is ready. Now you need to find a thicker screw, weld some "eye" for him at one end of a long channel, and the clamping device is ready.
This self-made clamp is convenient to use when working with overall dimensions, for example, when making doors. However, you can use two small clamps for gluing large surfaces.
In this case, use a flexible insert. Its material must be sufficiently rigid, and the plane slightly arched. Its ends are pressed against the two small clamps to the adherend sheets, and the insertion of the plane itself uniformly presses the entire bonding surface.
There are many options for manufacturing clamps independently. They are made, based on what they are used for( for permanent work or "at a time"), and also on the size of the parts to be glued together.
