From: "Kreig McBride" 
To: 
Reply-To: "Kreig McBride" 


Nice small drill press for a sale at Sears for $49 with 1/2" chuck.
Not a bad price. I think you an find these small drill presses at other
locations as well.  Considereing the number of holes an ATM will drill in a
lifetime, there should be a law requireing ownership.   A drill press will
give you a
vertical hole but you still need to do accurate layout and a center punch is needed.

 (No I am not promoting Sears, in fact i personally dont shop there unless I
have to.)

Kreig


-----Original Message-----
From: Ralph Seguin 
To: Eric Smith 
Cc: atm{at}shore.net 
Date: Tuesday, April 15, 2003 10:54 PM
Subject: Re: ATM drilling aluminum


>
>You would be much better off using a friends drill
>press or mill to get a nice vertical hole.
>
>Better yet, use this as an excuse to get a drill
>press...
>
>If you can do so, then use a center drill first to get
>a nice small pilot hole and then you can go with the
>full sized bit.  Set the speed right and use sharp
>tools.
>If you are going for a specific and accurate hole
>diameter, use a slightly undersized bit (google search
>on drill chart) and then a reamer.
>Or, you could use a boring head to get an accurately
>sized hole.
>
>Or, use a friend's CNC mill and use G83 :-)
>
>If you really have to do it with a drill motor by
>hand:
>I would use a punch/scribe/... to mark the center very
>carefully.  Make a small dimple that a drill bit will
>stay in while you start drilling.
>You could go straight to the large bit, but starting
>small might be good.  Once you have a pilot hole, you
>should be able to go with the full sized drill.  The
>point of the punch is so the drill doesn't dance
>around.
>Use cutting fluid to get a better cut and back out on
>occassion to clear the chips.
>Try to stay perpendicular to the surface.
>
>-Ralph
>
>--- Eric Smith  wrote:
>>
>> I need to drill a couple of 3/8" holes in 3/32"
>> extruded aluminum box.
>> I'd like these holes to end up where I actually
>> marked them :)
>>
>> I do not have a drill press (or much else).  I DO
>> have a drill motor and a
>> vice.
>>
>> What is the best path to success:  starting out with
>> a 1/16" hole and
>> using successively larger bits until I reach 3/8",
>> or just use the 3/8"
>> bit straight away?
>>
>> I don't want to spoil my stock.
>>
>> Thanks,
>> Eric
>>
>>
>
>
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