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Posted by Peter Fairbrother on March 2, 2008, 6:29 pm
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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
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Posted by John Stevenson on March 2, 2008, 6:42 pm
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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
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Posted by Peter Fairbrother on March 2, 2008, 7:31 pm
Please log in for more thread options 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
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Posted by ellis on March 2, 2008, 9:10 pm
Please log in for more thread options > 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.
Good luck
ellis
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Posted by Peter Fairbrother on March 3, 2008, 12:40 am
Please log in for more thread options 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
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>otherwise, to about 1/6th of it's diameter?
>
>(inconel 718 seamless tube, ~ 1/2" od, thin walled)
>
>Thanks,
>
>Peter Fairbrother