does the fermenting process always produce enough gas to bubble the airlock? this batch has not bubbled (over 24 hrs)and the last batch I brewed did not bubble much at all but turned out alright.
Yes, fermentation will produce orders of magnitude more CO₂ than it takes to bubble the airlock.
But usually when people are not seeing bubbles, it's because there is some other, easier, way for the CO₂ to escape. Either an improperly-sealed bucket lid or an improperly-set bung in a carboy neck.
Don't worry about seeing airlock activity, except as it might mean you don't have a good fermenter seal. For evaluating fermentation, focus on the change in gravity.