Re: drilling aluminum, imperfect circle [TANKS]

["Philippe Lachapelle" <plachapelle-at-gmail.com>]

exactly that type... it just does the job!

On 1/21/07, Amir Tahvildaran <adt22-at-drexel.edu> wrote:

Thanks, I'll give that a try.  Is this the type of drill bit you are
talking about?

http://jwbasecamp.com/Articles/SuperCat/Feedback/Unibit.jpg

-Amir

Philippe Lachapelle wrote:
> predrill is the way to go.... or there is on the market drill bit that
> pre drill and drill at the same time (tip is smaller)
>
> On 1/21/07, *Amir Tahvildaran* < adt22-at-drexel.edu
> <mailto:adt22-at-drexel.edu>> wrote:
>
>     I'm drilling through a 1/8" walled 1" aluminum square tube using a
>     S&D
>     5/8" black oxide bit.  I've found that the holes aren't perfect
>     circles
>     in some cases.  Anyone have tips?
>
>     I'm using a drill press at 560 rpm (which is correct for 11/16
>     holes in
>     alum) Should I go up one step?
>
>     I'm using "household oil" while drilling
>
>     I'm not predrilling a smaller hole which is the next thing I'll change
>     (3/8" is the next smallest metal bit I have).
>
>     The only other thing I've thought could help would be to clamp on and
>     drill through a piece of wood first to help stabilize the bit for when
>     it gets to the metal.
>
>     -Amir
>
>
>
>
> --
> Philippe  Lachapelle
> ---------------------------------------------------------
> Unyk: Philippe || http://www.unyk.com/
> Pour avoir des contacts toujours exact!
> For always up to date contacts!

-- 
Philippe  Lachapelle
---------------------------------------------------------
Unyk: Philippe || http://www.unyk.com/
Pour avoir des contacts toujours exact!
For always up to date contacts!