Milling and assembling new workbench top

maybe if you cross cut half way along the bow then do some magic flipping action the effective offset of the bow would be halved???

-- Ben, England.

That’s pretty typical of SYP dimensional lumber at the home centers. The moisture content is generaly higher than 8 or 9%. The best step perhaps to have prevented some of this would be to have the lumber acclimate in your workshop for a few days. Stacking them flat with stickers inbetween to allow air movement. This won’t prevent warping or twisting, but would have reduced it. The mistake was when you got them home and ripped into thirds, the lumber was unable to release the moisture evenly, thus they warped. You may encounter more warped boards as they dry out.

-- Measure "at least" twice and cut once

Are you getting bow on the boards w/ pith?

-- Bondo Gaposis

Sam Maloof’s Workbench could be an option:

-- Nature is my manifestation of God. I go to nature every day for inspiration in the day's work. I follow in building the principles which nature has used in its domain" Frank Lloyd Wright

Actually, the lumber had been in the shop already for a good month.

Regarding the pith, it doesn’t seem to have made the difference. The two outer boards were just as likely to bow (or not) as the one inner board.