Re: [ATM] Cutting thread in aluminium

[Göran Hosinsky <hosinsky@ya.com>]

I was cutting manually so I might have entered the hole at an
angle. I had drilled the hole with a drill press. But what
surprised me most was that when I tried to open the hole to
a bigger diameter, with the drill press, the drill had
difficulties cutting at that point, the aluminium seemed
a lot harder.

Garry, could you please repeat your links, they did not get
through.
Saludos
Goran


GARY FUCHS wrote:
 > Hi Goran,
 >
 > I've run up against the same problem. The right cutting fluid
 > seems to make all the difference. Here are a couple of links
 > to products that are available in the US - maybe you can find
 > something locally with the same properties?
 >
 >
 >
 >
 >>>Is there any special trick to cutting threads in aluminium?
 >
 > I was cutting a M5 thread by hand in a 15 mm thick piece of
 > aluminium, unknown type, when the tap (tap no 1 in a three
 > tap set) sized up and broke. I was pouring alcohol over the
 > cutting.
 >
 > At my second try, with a new tap, I managed to back out again
 > when it began to stick. I then drilled up the hole to a bigger
 > diameter and found to my surprise, that the drill had
 > difficulties
 > to go through the threaded part of the hole, it was like the
 > aluminium had been hardened at that point.
 >
 > Any advice would be welcome as I have quite a few holes that
 > I want to put thread in.
 >
 > Goran, La Palma
 >
 >
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