The Murphy Builders Site

Hey David,

Yes to one, no not yet to the other.

To start disintigration of a drill or a tap, or a ferrous screw, yes.
the nitric works. A 10% solution is good. AND DO NOT HAVE IT. OR
EVEN STORE IT STOPPERED UP, ANYWHERE NEAR ANY STEEL/ FERROUS MATERIAL
YOU MAY CARE ABOUT. The undetected vapour will cause rusting of any
ferrous product any where in air contact. I can't say where to get
it, because I have a pint bottle that was given to me. You are not
going to totally disintegrate the broken item like an EDM would.
Just "rot" enough of it to get it loose.

I your case, I'm a bit worried that you may have peened over the metal
by trying to drive it oput with a drift. If I were trying the 'drill
from the other side" trick, I think I wojuld have uise d a fair sized
larger bit or better yety a flat ended end mill, forwhen they were
about to "make contact", hopefuly forestalling breaking the seconf
drill.

And no, not yet to the use of FastOrange as a tapping fluid. But I
know and trust the guy who says it, to the extent that I just sent
off a credit debit to get some. I'm going to try the "real stuff"
first, and then try some el-cheapo generic from Canadian Tire for
comparison. I will report back on the results. The only waterless
hand cleaner stuff I have agt home at the present has grit in it to
help cleanm my hands.


Take care,

Brian Lawson,
Bothwell, Ontaio.

On Sat, 06 Dec 2003 10:55:48 -0400, you wrote:

Brian

Is this something you have seen done? How long did it take?

This thread has come up at a good time as I have been given an aluminum

part

with a couple of screws twisted off in it and I have been contemplating

the

right way to deal with it and eating the screws out with acid sounds too

good

to be true.

Cheers,

Dave R
elite583.cjb.net



Brian Lawson wrote:

Hey Scott, Ken et al,

Nitric acid will dissolve the hardened steel of the drill (or a tap)
without damage to the aluminum. Standard disclaimer, read and follow
the HAZmat and MHDS sheets, and try a test piece first.

The following is a recent quote of a current thread on a specifically
metalworkers group that I subscribe to. It is about a lubricant for
drilling and tapping Aluminum.

.........................................................................

......................................................

"I have been saying this for several years now, and will continue

until

the entire world sees the light of day. The best cutting fluid for
aluminum, bar none, is industrial strength Citrus based solvent. I
don't care what brand. The one I use is made by ZEP, and is called

Big

orange. The active ingredient is D-Limonene, and is extracted from
orange, lemon, lime, and grapefruit skins. It is the same stuff in
Fast orange hand cleaner , and all the citrus based cleaners. The
greater the percentage of active ingredient, the better. Big orange

is

98% D-Limonene. Take Off ( a floor cleaning solvent) is 45%, and is
available from Asplund Cleaning Supply. Big Orange works better than
any industrial aluminum cutting fluid I have ever used, and smells
great. It is also extremely safe, biodegradeable, and water soluble.
The shit just works great. Try it , and you will not go back.

"I use it for tapping, cutting, drilling, sawing, milling, and

turning.

Just keep some in a small pump spray bottle. Squirt a little on the
cutting edge as you cut." - Ernie Leimkuhler

Grant Erwin Kirkland, Washington
===
I have been looking for a Canadian source for this d-limonene. I

found

one that offered the stuff in three quantities - 55gal drums, tank

truck

and railroad tank car. This wasn't quite what I had in mind. I
eventually tracked down

http://www.tkoorange.com/

It sounded pretty good from the data on the web site but I couldn't

find

the actual concentration of the d-limonene so I e-mailed them asking

for

that info. Less than an hour later I had a reply.

"...Orange TKO is about 90 - 95% pure d'limonene. We use the

technical

grade of d'limonene, so it is a much higher quality that the food

grade

that some other products use (because food grade is cheaper). ..."

Aparently it has all the certs for use on food preparation equipment

if

you want when not cutting aluminum. I got a hold of some and tried

it

out this afternoon boring a ~2-3/4" hole in 6061-T6. Worked as good

as

Ernie claims - better than the A-9 I have been using.

.........................................................................

.......................................
Take care. Good luck.

Brian Lawson,
Bothwell, Ontario.
XXXXXXXXXXXXXXXXXXXXXXXXXXX

On Fri, 05 Dec 2003 08:03:15 -0500, you wrote:

I've got a wee can of Green aluminum cutting fluid/lubricant that I

find

is essential for drilling/tapping thick aluminum. You'll want some
before proceeding.

Can drill from the back side? It will destroy the bit when they touch
but if you are lucky you will be able to then drive a 1/8" punch

through

from the back. Gently warming it may help but I don't like to let it

get

hot enough to boil water for fear of loosing the heat treating.

Good luck
Ken

Scott & Leere' Aldrich wrote:

6061

#30

and

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