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


Also, the faster you can go to a large diameter, the stiffer the drill
gets, and thus less prone to deflections.
Even then, I have seen someone (ok, it was me a long time ago :-) have a
large diameter drill deflect by a large amount.

This is all kind of a moot point when drilling by hand, as your holes are
bound to be less accurate...

Also, use cutting fluid and sharp tools and the right spindle speed(s).

For really accurate holes, and to overcome chatter problems as Dwight
mentions, you should use a reamer.

-Ralph

-+- "Dwight K. Elvey"  wrote:
>
> >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
> >>
> >>
> >
> >
>
>_________________________________________________________________
> >MSN Instant Messenger now available on Australian
> mobile phones. Go to
>
>http://ninemsn.com.au/mobilecentral/hotmail_messenger.asp
> >
> >
> >
>
>
>


__________________________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo http://search.yahoo.com

--- BBBS/NT v4.00 MP