The logic behind fishmouth vice 30* ?

[Michael Horowitz]

Looking thru 43.13, I see splices that use fishmouths and I see others
where the outer sleeve is simply cut at a 30* angle.

Can someone discuss the logic of why they use one cut over the other?
- Mike

[jerry wass]

Michael Horowitz wrote:
> Looking thru 43.13, I see splices that use fishmouths and I see others
> where the outer sleeve is simply cut at a 30* angle.
>
> Can someone discuss the logic of why they use one cut over the other?
> - Mike
>

fishmouth takes up less linear space on the tube---(fits in a smaller
space) 30° is easier to weld.

[Michael Horowitz]

On Sat, 08 Aug 2009 16:04:45 GMT, Jerry Wass >
wrote:

>Michael Horowitz wrote:
>> Looking thru 43.13, I see splices that use fishmouths and I see others
>> where the outer sleeve is simply cut at a 30* angle.
>>
>> Can someone discuss the logic of why they use one cut over the other?
>> - Mike
>>
>
>fishmouth takes up less linear space on the tube---(fits in a smaller
>space) 30° is easier to weld.

No mechanical considerations then? just two way of doing the same
thing? - Mike

[canuck_bob]

I read somewhere, maybe Bingelis, that the fishmouth makes it easier
to weld if the tubing splice isn't a tight fit. Sorry no reference
for that, I just filed it away after reading.

Bob

[Michael Horowitz]

On Sat, 08 Aug 2009 11:39:47 -0400, Michael Horowitz
> wrote:

>Looking thru 43.13, I see splices that use fishmouths and I see others
>where the outer sleeve is simply cut at a 30* angle.
>
>Can someone discuss the logic of why they use one cut over the other?
>- Mike


I got a good answer from an instructor who teaches A&P candidates.
Use either one. The fishmouth is for when you don't have enough room.
- Mike