The thing you have to remember, is that the other site is geared to those that make their living in the machining business. The site owner has a few rules about what is acceptable in the way of tools and skills and what is not. The members over there get highly frustrated when someone new joins and does not take the time to even look at what is permitted, or asks basic questions that simple searches there or on other machining sites would provide a multitude of answers.
Conversely, H-M is geared to those that do not have to produce their income from machining, and it has fewer restrictions on what is acceptable. Both sites have their places. I'm a member of both and have been for a long time. If I have a question about something that is obviously a production or specialty related, it gets asked there. If my question is more generic or one-off related, I'll often ask here first.
Both site owners are good people and both sites have great members and lots of information can be gleaned from them. Just look at the rules for a site, no matter what it is and stay within the boundaries and enjoy them.