Woodworker's Journal 2006-30-2, страница 41

Clamping

Fans of pressure extend from each clamp head until they reach the glue joint. In the example at right, the fans overlap more than they would need to, but clearly, a single clamp would not have applied pressure along the entire length of the joint.

photo is the practice of alternating clamps on opposite faces of the panel. This helps to keep the panel flat, but you need to check the glue-up with a straightedge of some sort to be confident that the boards are correctly aligned.

Clamping blocks are another way to control your glue-up. The blocks allow you to place the clamping pressure exactly where you want it to close the joint and keep the panel flat. (See photo, below) You determine where the blocks must be placed during your dry clamp test. (Glue blocks also protect the edge of your panel from metal clamp heads, but that's a side benefit.)

Clamping blocks allow you to put the pressure exactly where it will be the most effective.