Quote:
Originally Posted by Rivethead
You shouldn't even need to ask this question. If you're that unsure of what it is you're doing you should stop right now and take a builders assistance class. One weekend and you could be up to speed for the entire project.
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Rivethead is right but you could just read the first part of the manual Van's ships with the kits and save the cost of a class. The BA classes are fine but they sure are not necessary, particularly if you're inclined to read for understanding. The manual covers your question and a whole lot more. If however, you're the kind of person who would rather follow directions and not think, take the builders class. It might save your life.
Take your time and fight the urge to rush. Learn the techniques before you try them out on plane parts. For the most part we all started off wanting to finish in record time or within some time frame. Almost everyone figures out quickly that rushing means doing the job over sooner or later and that is a LOT slower than figuring it out and doing it right from the start (and even then you won't always get it right - today I made 3 fuel lines to get two that met my standards).
Enough preaching. Generally you dimple up to and including 0.032 sheet aluminum. Thicker than than you'll counter sink. Practice counter sinking - it is harder than it looks to get precisely countersunk holes. Find some scrap (or buy some hardware store aluminum angle) and practice.