[Public-List] Rudder Stuffing Box Repair

[Anders Bro via Public-List]

I have often used a fine jeweller’s file to touch up threads, but there 
is an even better file available from machinist supply houses which is a 
"thread file". It has a square cross section, and each side has a 
different pitch that fits common thread sizes. Just look up thread file 
on your favourite web search engine. The adjacent threads help guide the 
repair of the dinged up ones. It really is a much handier way of doing 
it that with the triangular file, and just maybe would work. I like the 
approach of using the split die, But I have tried using nuts to try and 
chase threads, and it usually does not work that well. The metal that 
you are removing needs a place to go. So if you wanted to chase the 
threads with a steel nut-like arrangement, you might need to file some 
groves axially down the interior of the nut (split or otherwise) to 
develop some cutting teeth and again a place for those bronze ships to 
move into. It might be possible for the steel die to "cold form" the 
bronze threads back into their proper place, but I am not so sure that 
approach would work. It usually takes quite a bit of force to 
plastically deform the metal.
Anders

On 12/02/2014 03:03 PM, Glenn wrote:
> I once cleaned  up my threads with a  small 1/4" triangular thread file.  Worked very well and only had to do it once to get the nut to screw back on
>
> Sent from my iPhone
>
>> On Dec 2, 2014, at 8:43 AM, Anders Bro via Public-List <public-list at lists.alberg30.org> wrote:
>>
>> The problem with cutting and drilling a die though is that it is HSS (hardened steel)
>>
>> Sent from my iPhone
>>
>>> On Dec 2, 2014, at 8:38 AM, John Johnston via Public-List <public-list at lists.alberg30.org> wrote:
>>>
>>> Michael - The problem with the box wrench is that you can't slide it over an end without dropping the shaft, which is what I sought to avoid of course. Interesting idea, though. I think the two halfs of the die could be drilled and tapped with small cup screws. A machinist could probably knock it off fairly easily. Maybe a small clamp would serve, for as you say, it's really chasing and cleaning, not making new threads.
>>> _______________________________________________
>>> These businesses support your Association:
>>> http://www.alberg30.org/store/A30supporters.html
>>> Please support them.
>>> _______________________________________________
>>> Public-List mailing list
>>> Public-List at lists.alberg30.org
>>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
>> _______________________________________________
>> These businesses support your Association:
>> http://www.alberg30.org/store/A30supporters.html
>> Please support them.
>> _______________________________________________
>> Public-List mailing list
>> Public-List at lists.alberg30.org
>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org


 1417568037.0