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Forum index » Science and Technology » Engineering » Mechanics
Drilling Hole 1" deep in Copper
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wwswimming@yahoo.com
science forum beginner


Joined: 13 Sep 2005
Posts: 16

PostPosted: Fri Jul 14, 2006 2:40 am    Post subject: Drilling Hole 1" deep in Copper Reply with quote
i am posting to ask for advice on hole size in a block of machined
copper.

i don't have my text books with me. i don't remember alloys of copper.
for machining.

1" thick stock fly-cut both sides down to .980.

part size - about 1" x 1" x .980.

then i need a hole through the middle.

that's a long way to drill. the design benefits from having a smaller
size hole in there, it's for a heat sink. but a 1/8" diameter through
an inch of copper ?

i'm not sure i'd want to ask a machinist to do that. might lose parts
to drill breakage, don't want to have to deal with that.

so, what diameter would be most manufacturable ?

thanks !
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N:dlzc D:aol T:com (dlzc)
science forum Guru


Joined: 25 Mar 2005
Posts: 2835

PostPosted: Fri Jul 14, 2006 4:31 am    Post subject: Re: Drilling Hole 1" deep in Copper Reply with quote
Dear wwswimming:

<wwswimming@yahoo.com> wrote in message
news:1152844855.355004.180360@h48g2000cwc.googlegroups.com...
Quote:

i am posting to ask for advice on hole size in
a block of machined copper.

i don't have my text books with me. i don't
remember alloys of copper for machining.

1" thick stock fly-cut both sides down to .980.

part size - about 1" x 1" x .980.

then i need a hole through the middle.

that's a long way to drill. the design benefits
from having a smaller size hole in there, it's
for a heat sink.

Heat sinks benefit from having short conduction paths and high
surface area. A cube has none of this. Its only saving grace
will be relatively high heat storage capacity, so short duty
cycle.

Quote:
but a 1/8" diameter through
an inch of copper ?

A drill should be OK. It have seen obsure shapes formed using
"electrical discharge machining" (EDM) ... a simple hole should
be no problem for EDM.

Quote:
i'm not sure i'd want to ask a machinist to do
that. might lose parts to drill breakage,

No, but might "gum up" the flutes.

Quote:
don't want to have to deal with that.

I don't think it will be as bad as you imagine. Any reason you
aren't using one of the thousand or so standard heatsinks?

Quote:
so, what diameter would be most manufacturable ?

1/8" not a problem.

David A. Smith
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info@indraudyog.com
science forum beginner


Joined: 20 Jul 2006
Posts: 1

PostPosted: Thu Jul 20, 2006 12:56 am    Post subject: Re: Drilling Hole 1" deep in Copper Reply with quote
wwswimming@yahoo.com wrote:
Quote:
i am posting to ask for advice on hole size in a block of machined
copper.

i don't have my text books with me. i don't remember alloys of copper.
for machining.

1" thick stock fly-cut both sides down to .980.

part size - about 1" x 1" x .980.

then i need a hole through the middle.

that's a long way to drill. the design benefits from having a smaller
size hole in there, it's for a heat sink. but a 1/8" diameter through
an inch of copper ?

i'm not sure i'd want to ask a machinist to do that. might lose parts
to drill breakage, don't want to have to deal with that.

so, what diameter would be most manufacturable ?

thanks !
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Ed Ruf
science forum beginner


Joined: 19 Jun 2005
Posts: 40

PostPosted: Thu Jul 20, 2006 1:11 pm    Post subject: Re: Drilling Hole 1" deep in Copper Reply with quote
On 13 Jul 2006 19:40:55 -0700, in sci.engr.mech wwswimming@yahoo.com
wrote:

Quote:

i am posting to ask for advice on hole size in a block of machined
copper.

i don't have my text books with me. i don't remember alloys of copper.
for machining.

1" thick stock fly-cut both sides down to .980.

part size - about 1" x 1" x .980.

then i need a hole through the middle.

that's a long way to drill. the design benefits from having a smaller
size hole in there, it's for a heat sink. but a 1/8" diameter through
an inch of copper ?

i'm not sure i'd want to ask a machinist to do that. might lose parts
to drill breakage, don't want to have to deal with that.

We do this all the time in heat sink copper propulsion models at work.
Yes so care must be used, or you may need a visit to the edm to remove
the bit.
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Google
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