[PCB_FORUM] Re: drill hole...
- From: FranciscoMontoya@xxxxxxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Wed, 29 Sep 2004 17:39:49 +0800
Hello Gene, Fred
Taking off from Gene's thread, the closest you can get is a rectangle with
round edges. But you need a relatively large hole to allow the drills to
carve it. Using the slot's shorter side, the vendor will use a drill 1/3
(maybe) of its size.
ex. if you want a 4mm x 2.1mm slot, you need a 0.7mm dia (2.1/3) drill to
carve the hole. The smaller the drill, the more finer the edges, but may
take more time and such bits are more prone to breakage, which is the last
thing any vendor wants.
If the slot's short side is rather small, perhaps 2mm and smaller, the
vendor is likely to use a drill bit of a same size to save time.
The best analogy I could give is using your typical power drill, just drive
it to a piece of wood, then move it to a certain direction. You got your
slot instantly. Our CAD system can do perfect rectangles / squares, but
we're limited by the capability of the machines and process that go with
it.
bambam
J. Francisco D. Montoya
Group Supervisor
PCB Design Group
Astec International Limited
4/F Technoplaza One
18 Orchard Road, Eastwood City
Libis, Quezon City
Philippines 1110
Phone: (632) 995-4000 loc 4438
Email: franciscomontoya@xxxxxxxxxxxxxxx
Gene Carman
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<icu-pcb-forum@xxxxxxxxxxxxx>
09/29/2004 08:05 cc
AM
Subject
[PCB_FORUM] Re: drill hole...
Please respond to
icu-pcb-forum@fre
elists.org
The approach I have typically taken is to call out the slot and let the
vendor worry about how to actually make it. But I give "permission" for
things that can be done.
But from the vendor standpoint, without using a punch, the easiest way to
make a rectangular slot is to overdrill the corners then use a round mill
bit to do the square sides up to the overdrill.
What you need to do for your fab drawing is make this possible by allowing
overdrill in the corners by calling it out. The question for you is can
you tolerate overdrilled corners for this type of action?
-----Original Message-----
From: ponni dhanapal [mailto:ponnidhanapal@xxxxxxxxxxx]
Sent: Monday, September 27, 2004 11:34 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: drill hole...
Hi,
It is possible to provide a rectangular slot.In the pads stack editor there
are options for circular drill ,rectangular slot and Oval slots.U can have
any kind of padstacks using these.
Thanks and Regards,
Ponni.
>From: fred de melo <demelo@xxxxxxxx>
>Reply-To: icu-pcb-forum@xxxxxxxxxxxxx
>To: icu-pcb-forum@xxxxxxxxxxxxx
>Subject: [PCB_FORUM] drill hole...
>Date: Mon, 27 Sep 2004 12:45:28 +0200
>
>Hi,
>I use Allegro Design Expert and I wanna create a padstack for a special
>connector.
>Well, I want to know if it's possible to design a pad with a rectangular
>drill hole...
>I have imagined a solution : I enable multiple drill and make a row of
>circles...But it's not exactly what I want...
>
>Thanks for your answers !!!
>
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