[modeleng] Re: Mystery Thread & New Loco

Al,

The thread had stripped about 1/2" into the end of the tube but the original 
thread was about 3/4" long so I set up the thread cutting operation to 
extend the remaining thread using a tpi of 26. I suspect the thread is 
actually 1mm pitch as the new thread does go slightly tight when a collet is 
screwed in more than 1/2". I avoided the metric pitch because, although my 
lathe will cut them, it is not possible to release the clasp nut from the 
leadscrew between passes! I felt sure this would result in a catastrophe!

Regards,


Barrie


----- Original Message ----- 
From: "Allen Messer" <al_messer@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, August 13, 2006 11:32 PM
Subject: [modeleng] Re: Mystery Thread & New Loco


> Glad you were successful, Barrie, but what was the
> diameter and pitch you came up with??
>
> Al Messer
>
> --- Barrie Purslow <bpduo@xxxxxxxxxxxxx> wrote:
>
>> Thanks to those who responded on this topic.
>> I was trying to identify the thread in order to buy
>> a tap having avoided thread cutting in the lathe for
>> so many years I had become paranoid about it. Well,
>> since running was rained off today I grasped the
>> nettle, called up reserves of "the old magic", took
>> the stripped tube end and screw cut the existing
>> thread further up the tube. I then cut off the
>> stripped portion and relieved the other end to make
>> up for the offcut. Bingo - collets are back in
>> business.
>>
>> Truth is I have spent the last year working on a
>> certain 5" Duchess and become slightly obsessed with
>> it to the point where all workshop maintenance work
>> was ignored. However the engine is now up and
>> running and I have a few pictures to prove it. Would
>> it be possible to put them on your website Alan?
>>
>> Regards,
>>
>>
>> Barrie
>>
>>
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>
>
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