Back when Woodworking.SE was going through Area51, the Community Team noted the potential for overlap with DIY. We decided the overlap wouldn't be too big of a problem because we believed woodworking could stand on its own as a discipline. What you have here, on this site, is a group of people who are familiar with the minutiae of woodworking in a way that folks on DIY may not be. As such, you have the opportunity to get much more in depth with your Q&A.
If you have a question which has already been asked and answered on DIY, but you can provide a much higher level of detail, by all means, ask it here. Stack Exchange sites are at their best when they're surfacing the details which reveal the cause and effect of a problem, and details help with this. Alternately, if a question has been asked already on DIY, and you're not able to provide more information when you ask it here, then its probably best to hold off.