Thread adapter (different pitchs)

[Tidy Max]

Alreet chaps.

Does anybody know of a thread adapter that will connect gas/water fittings to electrical ones.

I.e. 15mm compression end to a 20mm lamp holder?

 

[Geordie Spark]

The forming of any thread,in engineering use,has strict guidelines,applications and material type.

This should not be a surprise,as the modern world is held together by the use of threads,from a wooden hat stretcher,to the space shuttle...

Mr,Whitworth was a childhood hero,and,at last he has a section in Manchesters' Science and Industry Museum...

It is a shame that many modern learning paths,including apprenticeships and college courses,fail to emphasise topics such as thread forming and metallurgy,and treat these as insignificant details of a trades making.

Brush,barrow,shovel...this what i was told as a boy...learn how to use these,no lines,no edges or corners...THEN,work upwards from there,to conquer the rest of the workshop :icon12:

...Now i must go,and organise my street-urchin pick-pocket team....

Thank you, Thank you and Thank you ... at last I've found a kindred spirit here who has some understanding of the finer points of screwing!!! :happy:

Whitworth - the father of British Standards - is one of my heroes too - along with Stephenson (Father and Son) Brunel,Armstrong, Parsons, Swan (leccy light BULB!!) and others too numerous to mention.

 

[Geordie Spark]

Continuous cut and automatic opening of the dies at the competition of the cut. I can’t remember the make.

How many times have you seen someone continue cutting the thread beyond the stop point and then wonder why their nice pipe run resembles Trafalgar Square fountains?

I've seen people screwcutting on a centre lathe not get the half nuts disengaged in time and the whole ensemble crash into the chuck.

NOT a pretty sight.

 

[shanky887614]

Soldered ends will look crap. Ive built a desk lamp out of copper pipe and used 15mm elbows and tees. I have some brass bc lamp holders with a 20mm female thread. I knew the compression end had a different pitch thread i just thought i would cross that bridge when i got there....

I am now there lol. Neither the wholesalers, plumbers merchants or commercial "we do everything under the sun" merchants can help.

I will be building a fitting soon with soldered joints but as for this one i am abit stuck ill check the links when i am back at my laptop! Cheers for the advice

ive seen some crap soldering on sites at the moment.

quick tap and wire wool while its hot will sort it out.

or do it properly with flux and little dab on one side and let it draw around

Seriously, he's a canny hand at the soldering lark.

Not sure about his Brazing skills though - he probably thinks more in terms of Braising - as in cooking missionaries. [emoji23]

 

[shanky887614]

THAT was your mistake!

It's the way I was taught in the school metalwork shop but the first time I did it at our workshop at home my Dad went ballistic!

His argument was that when you turn it backwards you risk breaking a bit of the dies teeth off and then it jams & breaks.

When I started my apprenticeship I was shown to do it without winding it back - just like Dad said!

And, when you think about, it tapping attachments that you use in drilling machines don't wind back half a turn either. They just keep going in the same direction.

not heard that one before, never seen anyone just carry on with conduit for example