Following up on a previous Woodworking Forum Search that I made, here's a similar Machining Forum Search:

Click here to search 12 different machining forums at once

This Google Custom Search Engine (CSE) searches through 11 machining forums plus the forum at once (12 total), and no other websites. Here are the included websites:

Any others that I should include?

And, here's a link to the previous custom search engine for 39 woodworking forums:

Click here to search 39 different woodworking forums at once

Previously: Background on how to make these custom search engines