Clamping Pressure For Wood Glue

The fine woodworking article also gave rough estimates of the average pressure various clamps are capable of producing.

Clamping pressure for wood glue.

Too little pressure will fail to achieve any of these benefits. Third it overcomes minor surface imperfections between mating surfaces. And fourth clamping holds parts in position until the glue cures. In addition to getting the two pieces of wood close enough together for proper gluing pressure also squeezes out the excess adhesive and pushes the glue into the microscopic nooks and crannies.

Too much glue can cause glue run out problems that will likely cause other issues at the time of finishing the project. When those forces cause a failure it might not involve the original glue joint. Proper clamp pressure will also compensate for any imperfections between the two mating surfaces. For softwoods pine poplar.

Second as the glue releases moisture causing the wood to swell clamping overcomes this pressure and prevents the joint from opening up. During extensive research they undertook on gluing and clamping pressure the only manufacturer s reference the folks at lowell thomas tool found was on the titebond website. When we tested one handed bar clamps issue 139 we found that they provided pressure just into the softwood range or a bit less. Dale zimmerman of franklin international maker of titebond woodworking glues recommends 100 to 150 pounds per square inch psi for clamping softwoods and 175 250 psi for hardwoods.