Guys,
This follows on from my previous post about my airline pipe around my garage...
A bit of background...
I already had some suitably sized brass hex bar so have made a few 1/2" BSP - 1/4" BSP reducers and 1/2" BSP - 1/2" BSP Male couplers (all parallel and not tapered threads).
All have been cut with HSS hand taps and a new (Goliath) Carbon Die.
I bored the female threads to the 'drill size' written on the tap and cut nice internal threads. For the male threads I turned the brass down to the appropriate major diameter and cut the thread with the die.
Both parts fit together nicely with minimal play in the joint.
In line with the recommendations received already I bought some Stag jointing paste, coated the thread liberally, put the parts together and left them for 24hrs before applying any air pressure... Blow me the joints leaked:(
I then pulled them apart, re-cleaned and repeated the procedure again... 36hrs later I still have a leak from the joints.
Previously (when I lived in the UK) I have always used white PTFE tape and cant say Ive ever had a leaky joint. Unfortunately Ive run out of my UK tape so thought Id give the Stag (thick red one) a try...
What am I doing wrong? Any thoughts or suggestions? Try as I may Ive not been able to find any instructions on how to use the stuff (other than whats written on the tube).
Thanks
J
This follows on from my previous post about my airline pipe around my garage...
A bit of background...
I already had some suitably sized brass hex bar so have made a few 1/2" BSP - 1/4" BSP reducers and 1/2" BSP - 1/2" BSP Male couplers (all parallel and not tapered threads).
All have been cut with HSS hand taps and a new (Goliath) Carbon Die.
I bored the female threads to the 'drill size' written on the tap and cut nice internal threads. For the male threads I turned the brass down to the appropriate major diameter and cut the thread with the die.
Both parts fit together nicely with minimal play in the joint.
In line with the recommendations received already I bought some Stag jointing paste, coated the thread liberally, put the parts together and left them for 24hrs before applying any air pressure... Blow me the joints leaked:(
I then pulled them apart, re-cleaned and repeated the procedure again... 36hrs later I still have a leak from the joints.
Previously (when I lived in the UK) I have always used white PTFE tape and cant say Ive ever had a leaky joint. Unfortunately Ive run out of my UK tape so thought Id give the Stag (thick red one) a try...
What am I doing wrong? Any thoughts or suggestions? Try as I may Ive not been able to find any instructions on how to use the stuff (other than whats written on the tube).
Thanks
J
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