20-07-2016, 05:21 PM
(20-07-2016, 03:53 PM)dr_jekyll Wrote: Trust a nut and bolt over a helicoil any day!
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Your logic on helicoils are misconceived there fella.
Being a qualified machinist, it is actually an upgrade to the stock and standard thread, simply because they are alot stronger and hold their threads better. I have never known a helicoil to strip or pull out.
you have to imagine a helicoil is like an adapter thread. so if the thread is M10 (10mm) the heli coil is M12, meaning you have the strength of the M12 bolt, on an M10 stud. the only thing that will fail there is the stud, not the helicoil nor the material you put the helicoil into, beit aluminium, copper, brass, magnesium etc etc.
In many instances, it is common practice to actually put them in during machining with softer materials like aluminium, as they take all the strain off the soft material and make a very good mechanical bond.
It is good practice to use locktite on them, as if they do unscrew, you will have to put a new one in. But then it will never strip or fail again.
The only reason this is not done from the start, is simply because of cost. I have been known when buying cheap parts for my motors in the past, to actually do this from the off. It adds so much more security to the mechanical bond its unreal.
To say a heli coil will fail, is like saying the titanic floats.
You can get the kits of ebay for about £10, If you do it, and it fails, i will eat my words.
Not always Grumpy!!
306 Cabby SE, 2.0l 16v
To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be!
