[time-nuts] Machining some aluminum help!

Bob kb8tq kb8tq at n1k.org
Fri May 19 18:24:23 EDT 2017


Hi


> On May 19, 2017, at 5:35 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> 
> Yes, threaded inserts.  There are many kinds but they are used almost
> universally for cases where the material to be threaded is soft, like
> aluminum.   They also eliminate or reduce galvanic corrosion which is an
> issue with steel screws in aluminum.  (that said, as long as you keep water
> away you are OK.)    

There are some interesting internal studies out of places like Boeing that suggest the “keep moisture
away” includes some pretty modest levels of humidity …. It then becomes a question of if you do
or do not accept their methods. 

Bob


> Still these inserts are the "class" way to go and will
> save some broken taps.
> 
> As for a seal, it is hard to beat o-rings.  A proper designed o-ring seal
> does not need much clamping pressure as it depends on the pressure inside
> to force the ring in place and hold it there.
> 
> On Fri, May 19, 2017 at 12:51 PM, Lincoln <lincoln at ampmonkeys.com> wrote:
> 
>> 
>>> 
>>> There are a lot of variables involved. Run the screws in and out of the
>> aluminum a number of times and
>>> the holes will fail first ….There are other gotchas as well.
>>> 
>>> Bob
>>> 
>> 
>> This is where helicoils come in to play. They are used a lot on the CVD
>> furnaces that I used to make parts for. They are not just for un-buggering
>> a thread. They would be installed form the get go and could be replaced
>> should something gall.
>> 
>> Link
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> 
> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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