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?

 

[Knobhead]

Just picked up a length of black malleable iron pipe....... but its red?! Looks like i am going to have to get the next fitting powder coated!

Join the club ;-)

I made that mistake at the foundry. We needed 10 lengths, there was 5 lengths of black finish in stock so in all innocents I placed an order for the rest. Just to rub it in the fitters ran it with alternate colours.

 

[Marvo]

Here's a thread from almost 2 years ago when I was making something similar to what you're describing.

http://www.electriciansforums.co.uk/chit-chat-off-topic/78504-soldering.html

 

[Tidy Max]

What a ballache, so can i not get black malleable any more? I am going to ring around today, surely they should state black malleable with a red oxide finish!

 

[Knobhead]

Most people who order it aren’t that bothered what the colour is. A pipe is a pipe, so long as it doesn’t leak, who’s bothered.

The job I mentioned above worked perfectly and after a month it was the same shade of ---- grey as the rest of the plant.

 

[Geordie Spark]

Ive snapped the flaming threading tool :'( i only managed 4 threads, one whole twist half a twist back just like i do galv, i used threading compound too, and the thing just snapped!

Well annoyed!

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.

 

[Tidy Max]

Well Geordie, that half a twist back has caused quite an unbelievable catastrophic failure.... i would take a photo but ive left the broken bits in my van.... and i've just put me jim jams on hahaha

edit: i actually have a photo on my phone that i look of the side of the die before i took the cover that holds the jaws in off. Just dropboxxing it now which on our internet connection takes an age

 

[Geordie Spark]

Well Geordie, that half a twist back has caused quite an unbelievable catastrophic failure.... i would take a photo but ive left the broken bits in my van.... and i've just put me jim jams on hahaha

edit: i actually have a photo on my phone that i look of the side of the die before i took the cover that holds the jaws in off. Just dropboxxing it now which on our internet connection takes an age

It isn't unbelievable to me - I would expect it!

 

[Tidy Max]

So when i removed the 4 screws on the chrome bit the rest of the die basically sh#t its self. Fractured straight across!

 

[PEG]

View attachment 28441

So when i removed the 4 screws on the chrome bit the rest of the die basically sh#t its self. Fractured straight across!

...Oh dear...that looks more "wijid" than "Rigid" :conehead:

I have an old multi die head,"Presto" i think,1/2" BSP to 1 1/2" BSP,it is older than me,and i'm old enough to remember when you could boast about having a "Jim'll fix it" badge....

Still works a treat...must be that 40 year old Mistic concentrate i squirt on it...:icon12:

Just another tip,Tidy,if you decide to build your own,using soldering,brazing techniques,is make a jig to hold your creation in the desired shape.

Do not rely on the fact that fittings are "straight" or "90 degrees",the clearance,for the joining medium,will cause accumulated inaccuracies.

This can be demonstrated to tyros,by getting them to solder six short pieces of 15mm together,using five straight connectors,the first being held horizontal,in a vice.

....It looks like something that wouldn't father children...:icon12:

 

[Silly Sausage]

View attachment 28441

So when i removed the 4 screws on the chrome bit the rest of the die basically sh#t its self. Fractured straight across!

Hahaha... I did that once doing mods for an instrument air cleaner.
Got the yard plumbers to thread rest for me, much easier!

 

[Knobhead]

I was lucky, a powered threading machine for up to 3” in the workshop. We had the ratchet set for small on site work, sod that, take the pipe to the shop.

 

[Geordie Spark]

I was lucky, a powered threading machine for up to 3” in the workshop. We had the ratchet set for small on site work, sod that, take the pipe to the shop.

And I bet that thing didn't go one turn forwards and half a turn back!!

Nuf Sed!

 

[Knobhead]

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?

 

[PEG]

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?

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....

 

[Tidy Max]

I really enjoy threading stuff tbh. I will take the threader back tomorrow and get it replaced, some kind chap on the plumbing forum has recommended one of ebay which is supposed to be decent and does both metric and imperial sizes too. The show must go on!

If anybody can recommend a place to get some black malleable (actual black malleable) it would be much appreciated. A couple of wholesalers have just told me they don't get told what it is it just either turns up black or turns up red oxidededed!