Join Date: Jul 2008
Location: Dickinson, Tx. / Somerville, TX
Here is a link to SAGULATOR, Woodbin.com/calcs/sagulator/
Just look up the type of wood, the thickness, etc and it will tell you how much sag you will get at a given distance and take it from there. The sagulator is actually meant for shelves but I don't see why it wouldnt work for a twin trestle table.
There are also broad 'rules of thumb' (like to 1/4. 3/4 ratio stuff) that can be found on the web for glass tops, wood tops etc. Those usually are for concerns over stability.like in tipping over. Your question specifically addressed sag, so give the sagulator a try first.
Retired woodworker, amongst other things, Sold full time cruising boat and now full time cruising in RV. Currently in Somerville, Tx
Last edited by Tony B; 09-09-2019 at 04:06 PM.