Lv 5
Skylar asked in Home & GardenDo It Yourself (DIY) · 10 years ago

What kind of drill bit do I need to drill through roughly 1/4" of "356 T6 aluminum"?

I'm planning on doing a little DIY project with a pair of longboard trucks, and I need to drill two 3/8" holes in "356 T6 aluminum". I'm a bit clueless when it comes to this kind of stuff.

What would be the best way of going about doing this? I've heard that it'd be best to start with a smaller bit to get started, then use a larger one, but I don't know if I need to do that with a hole as small as this.

Thanks in advance.

6 Answers

  • 10 years ago
    Best Answer

    You need two cobalt steel drill bits, a punch, and some cutting oil. Locate the hole and pin punch the spot. Use a 3/16" cobalt steel bit and make a pilot. Use lots of oil so the aluminum doesn't discolor with the heat. Then drill the 3/8" hole to final spec. Continue to use the cutting oil while drilling the second hole.

    Good luck, man.

  • Hondu
    Lv 7
    10 years ago

    Usually it is recommended that a chip breaking drill and pilot holes are used on any T6 alloy aluminum, but since you only need two holes, and the thickness is only 1/4", that isn't even an issue for you. Any 3/8" steel "jobber" high speed bit will work just fine.

  • 10 years ago

    pilot holes are always good for holes larger than 1/4". but if accuracy isn't critical a 3/8" hole in aluminum should not be a problem. it's easier to keep a small bit from "walking around" while getting the bit started. using a center punch first to make a dent in the center of where you'd like to drill is the most help. good luck!

  • 4 years ago

    One of your problems with that is that you fail to take into account the cost of getting that oil out of the ground to the price of oil. They take the cheapest oil to get out first. That cheap oil was in the Middle East. That's also why we declined in production since 1970. We don't have all that much oil. Even if we did, we don't own it, we lease the areas to the oil companies and they charge us the going rate. One day any way you look at it we will be out of it. We need to seriously look into developing new engines that won't need gas to function. Something renewable, and affordable. I'm tired of looking into alternatives that you have to be rich to afford, like solar panels for the home. There is just no payback there for longer than I'll be alive.

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  • 10 years ago

    use a step drill bit

    Source(s): 30yrs
  • 10 years ago

    center punch any standard h.s drill bit

    Source(s): maint man
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