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Reply by HorizontalMike

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Posted on Are Most Benchtops Woefully Underclamped during Glueup? (probably not)

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HorizontalMike

6923 posts in 1539 days


#1 posted 621 days ago

I am biting my tongue on this one 8-P…!!

IMO, the OP has mixed up ”PSI” with ”Total Pressure” exerted on a pair of boards being glued. OK, a pipe clamp exerts 1050 lbs PSI and let us ASSUME that this pipe clamp has 2 sq.in. of clamping area.

So that equals 2100 lb of pressure PER CLAMP and NOT for the board’s length! And NOT PSI for the board’s area either (unless only one clamp is used).

Using 10 pipe clamps = 21,000 lb of total pressure exerted on/across the ENTIRE length of the board, thus this “21,000 lb of pressure” is averaged out over say 100sq.in. of board clamping surface. This is NOT PSI and needs to be noted. So the average clamping pressure on these 100sq.in. is just 210 lb. PSI

I hope this helps.

-- HorizontalMike -- "Woodpeckers understand..."


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