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Posted by Graham on March 3, 2008, 2:17 pm
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On Mon, 03 Mar 2008 05:40:42 +0000, Peter Fairbrother
>ellis wrote:
>>> John Stevenson wrote:
>>>> On Sun, 02 Mar 2008 23:29:38 +0000, Peter Fairbrother
>>>>> Any hints, tips, tricks or links for thinning tube, by spinning or
>>>>> otherwise, to about 1/6th of it's diameter?
>>>>> (inconel 718 seamless tube, ~ 1/2" od, thin walled)
>>>>> Thanks,
>>>>> Peter Fairbrother
>>>> Buy it 1/6 smaller than what you have
>>> Ah ha!
>>>
>>> What I actually want to do is make a neck in the tube, ie make a short
>>> part of the tube much thinner, perhaps in the lathe using some type of
>>> round-nose pliers and lots of grease to squeeze it down, while the rest
>>> of the tube remains the original diameter.
>>>
>>> Any hints, etc?
>>>
>>> -- Peter F
>>
>> Peter
>>
>> I am not sure that I understand - do you need a thinner wall thickness
>> or a
>> reduced o.d.? If it is a reduced o.d. consider: the following
>>
>> How long is the piece you want to neck? If it is only a few inches
>> long you "might'
>> be able to do it in a press as rifle cartridges are necked. Several
>> sets of dies and
>> lots of annealing will be needed. If that doesn't work there is always
>> rotary swaging
>> but that isn't normal workshop kit, and I have no idea who would do it
>> in the UK.
>
>Reduced OD, from about 1/2 " to about 1/10 ".
>
>As it's inconel, and the reduction is large, I'd guess rotary swaging is
>what's needed.
>
>
>Thanks,
>
>
>-- Peter Fairbrother
I've not tried this but would a pipe cutter with the blade and rollers
replaced with something more suitable do?
Also casting my mind back to that video of that fellow who made his
own valves. He seemed to use a device to neck the glass that rotated
one end of the tube and rotated the other end slightly slower.
Obviously some serious heating would have to be applied in your case,
but former could be used to get a good finish.
Graham
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