Ask HN: How long should I wait before asking for a raise?

I have more than 5 years experience in my field (software development). I took a Junior position 6 months ago, working with a new language/platform I didn't have experience with but wanted to learn for some time. I know I still have TONS to learn, but I feel I need to jump from Junior to Intermediate or something because I am getting bigger and more complex projects now, and off course I want to increase my salary.

What would you recommend, I've always followed the old saying 'The squeaky wheel gets the oil'.

P.S. I tried to make this post as generic as possible because I think it would still be valid for other areas or industries.