[TowerTalk] Increasing the Inside diameter of a 1 inch outside diameter Alum pipe.

[Grant Saviers]

Yes, there is one *almost* fit of ham interest (1 to 1-1/4 sch40), IF 
the pipe is round and the weld seam inside is small.   I've done the 
boring bar and od turning make them fit, but sure don't like doing on 
the dirty crap steel of welded  pipe.  6063 pipe is a less PITA.

A "triple" oddball fit is sch10 Al 1-1/2 to sch40 1-1/4 to inside sch80 
2" pvc as used in the original W6NL 40m Moxon driven element insulator. 
  Took some heating of the PVC but it worked.

Grant KZ1W



On 8/31/2022 09:48, Richard Karlquist wrote:
> Some pipe trivia:
> 
> Any Schedule of 1" trade size has O.D. of 1.315"
> 
> Sch 40 1 1/4" trade size has I.D. of 1.380"
> 
> The smaller pipe will fit into the larger one with a 32.5 mil clearance
> 
> Any Schedule of 1 1/2" trade size has O.D. of 1.900"
> 
> Sch 80 2" trade size has I.D. of 1.939"
> 
> The smaller pipe will fit into the larger one with a 19.5 mil clearance
> 
> Any Schedule of 2 1/2" trade size pipe has an OD of 2.875"
> 
> Alum irrigation pipe with 3" OD and standard 0.065" wall has an I.D. of
> 2.870"
> 
> The smaller pipe will fit into the larger one with 2.5 mil clearance
> 
> Yes that IS snug, especially in the two pieces are not perfectly
> circular, which
> 
> they never are.  A rubber mallet may be called for.  Hi.
> 
> I have taken advantage of all of these accidental fittings many times to
> build various homebrew sliding or rotating joints, etc.
> 
> ---
> Rick Karlquist
> N6RK
> 
> On 2022-08-31 08:27, Grant Saviers wrote:
> 
>> If it really is PIPE - NPS dimensions then there is no slip fit inside or outside that fits without machining one or both parts
>>
>> There are some very rare exceptions of tube/pipe fits in other than the standard schedule 40 pipe standard od and wall, since pipe comes in same od but different wall thickness from schedule 10 to 120 and beyond.
>>
>> Grant KZ1W
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk