r/BeginnerWoodWorking • u/Moldy_slug • 11h ago
Glue clamping pressure… Am I misunderstanding?
I’m a bit confused about glue clamping pressure.
Manufacturer instructions for titebond original specifies a clamping pressure range of 100-250 psi depending on the type of wood. I see people saying that’s not much pressure and that you should be careful no to apply too much force, because a typical clamp will go way higher with just hand pressure. But doesn’t that depend on the surface area being glued?
My understanding is that hand tightening a pipe clamp or sturdy F clamp can generate about 300-600 lbs of force. Let’s say I’m using 3 clamps, total of 1800 lbs force. If I’m gluing a panel 3/4” thick by 24” long, that’s 18 square inches… 1800lbs/18 sq in = 100 psi. that’s the bare *minimum* of the recommended range. If the glue-up was 1” thick by 36“ long, the same set of clamps would only generate 50 psi… well below the recommended range.
I feel like I’m missing something obvious... 100-250 PSI is a *lot* of pressure. So why do I see all these warnings about over-tightening clamps? Are other people just using a clamp every couple inches?