Messages Archive

Re: A discussion of panel clamps

Bill Tindall, E.Tn.
"Considering that many of the craftsmen who made the antiques we admire probably had none of these clamps and at least in some cases made rubbed joints I am skeptical tremendous clamping force is necessary. "

You get to choose whether Franklin, maker of Titebond, did well designed experiments and came to valid conclusions for recommending clamp pressure for various wood species. But what can not be denied is that this work applies to their glue, under factory conditions which involve humidity control, lumber moisture content control, controlled glue thickness application, edges prepared on industrial equipment and clamp stations for applying the pressure, with the goal of achieving maximum joint strength. It seems a stretch to extrapolate what you have observed for antiques to be skeptical of Franklin recommendations for their product under modern factory conditions.

Most of the technical manual from Franklin on "Troubleshooting Glue Failure" involves joint preparation and clamp pressure. Don't you suppose this manual is a result of their experience in dealing with customer glue failures with their product? Perhaps if you are willing and able to emulate the materials, procedures and results of a 1780 shop you won't have to worry about clamp pressure for your needs. Otherwise it might be prudent to presume Franklin has determined how to best use their product. You get to choose how close to "best" you are willing to work.

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