Loctite 609 is the stuff to use, it is supposedly specially formulated
for oily bearings such as sintered bronze bushes, it replaces loctite 603
which had a limited shelf life, and, I think its other problem was it tended
to be hygroscopic.609 is very well suited for press fits and works so I have
found out by disseminating itself into the grain of the material and
augmenting the press fit. It is classed as medium to high strength, maximum
gap fill is .2 millimetres, maximum temperature is 150 degrees C, and sets
in about 30 minutes. It is advisable to have a radiused edge on the leading
edge of the bush other wise when the bush is inserted it tends to scrape the
loctite from the joint, and cures in a confined space by the absence of air,
not recommended for use in oxygen rich environments, and costs about $10
dollars for 10 millilitres. Loctite 620 will also do the job just as well.
The other thing I learn't was just listen to what the kr net sais and use
rod end bearings, ( well, bushed hinges should have worked out reasonably
cheaper, but in practice, its not working out that way ).
Chris Johnston
North Richmond NSW
Australia
----- Original Message -----
From: "Scott William" <scot...@yahoo.com>
To: "KRnet" <kr...@mylist.net>
Sent: Wednesday, August 02, 2006 11:37 AM
Subject: Re: KR> using loctite
> Loctite isn't designed to "bond" parts together beyond
> .007 of a gap between those parts. (I think the 660
> will will go to .020) Loctite 640 bearing retainer is
> what i always used on taper shafts, and I find it
> strong enough to eliminate the reliance on the
> retainig keys on those shafts. It is used as a filler.
> It goes in and remains where there is any kind of
> clearance. It dries in the gap, and has enourmous
> sheer strength, but no bond strength.
>
> Do not use it to hold parts together. Use it on
> press-fits to make the fit stronger.
>
> --- Chris Johnston <chr...@ozdocs.net.au> wrote:
>
>> I need to fit some sintered bronze bushing into
>> aluminium plate, the parts are a good interference
>> fit but I thought some loctite would not go astray
>> either. Any information I have found so far on the
>> on the web suggests that you coat the parts with
>> loctite and then press fit together, but I would
>> think this would scrape any adhesive from the joint
>> and there would be no bond, unless tehy are relying
>> on the loctite soaking into the bush and bonding
>> that way. Loctite 603 I think is the one to use as
>> it is specially formulated for oily surfaces. The
>> only other option I can think of is to make the bush
>> slightly thinner than the plate and fill around the
>> edges with loctite.
>>
>>
>>
>>
>> Chris Johnston
>>
>>
>> North Richmond NSW
>>
>>
>> Australia.
>> _______________________________________
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>>
>
>
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