From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


>From: "William Thornley" 
>
>Hi Eric,
>
>You'll find aluminium soft enough to mark your drilling point with the push
>of a sharp scriber(easier to line up your markings) . Centre punch this with
>a centre punch and hammer. That will get your first drill right where you
>want it. Hammer across the drilling point (hold the centre punch at an
>angle) if you missed slightly, to bring the drilling point back to your mark
>and repunch.
>
>Next, start with a small drill 2-3mm (1/16"-1/8"). Increase
in increments of
>3 or 4 drill sizes between drilling until you reach your wanted size. That
>way you will ensure your final hole is dead centre.

Hi
 As I stated in my previous post it is best to not step the
drill sizes. If the hole is a large percentage of the drill size you intend
to end up with, the dill will virbrate. This often makes a hole with three
or 5 lobes as the drill steps around the hole. It is better to make only a
small pilot hole about the size of the wedge part of the final drill size
you intend to have.
Dwight

>
>Hope this helps
>
>Regards,
>
>Bill Thornley
>Sydney, Aus.
>
>>Eric wrote:
>>Thanks, everyone, for your input on this.  Think I'll get a drill
>press :)
>>
>>Regards,
>>Eric
>>
>>
>
>
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