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  1. #31
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    Aug 2009
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    Sydney, NSW, Australia
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    Ok thanks Karl i thought they were pre set with the correct spring for the specific PSI, As of now i have one of these on the way https://www.mcmillanair.com.au/product/relief-valves/ its not a safety valve but rather a relief valve and its adjustable made in Italy so should be good quality it goes from 60 to 150 PSI i will set the idle down to idle around 115 PSI i will set this relief valve to go off at 120 PSI

    i called Pilot Air about there idle down piston the lady looked up the information to see if it were adjustable but said she couldn't find anything indicating it can so i may need to look around for one that can be adjusted

  2. #32
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    Aug 2009
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    Sydney, NSW, Australia
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    Trying to figure out if i can find the right adaptor for my tanks take off if i can use that i will last resort will be to tap the inspection plug

    I was just measuring my male protrusion from the tank it measured 16.5mm the female nut measured 15.5mm now when i tried to find a match on the thread using my tap and die set i couldnt find a perfect mate but it looks like 1.2 pitch thread can someone help me out on what fitting it has? I need to buy a L female to male needs a male 1/2", female nut to screw onto the tank

    If i can find the right adaptor i'll than run a strait 4 way manifold off the adaptor than run my relief valve, gauges and outlet off the manifold

  3. #33
    Join Date
    Sep 2005
    Location
    Bendigo
    Age
    60
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    419

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    A lot of threads for compressor fittings are bsp.

    From your measurement could be 3/8 th ?
    https://www.ryco.com.au/technical/th...-bspp-threads/

    Roughly, 16.3 x 1.33mm

  4. #34
    Join Date
    Sep 2010
    Location
    Lebrina
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    1,910

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    Not so sure you have the correct valve there Gazza. The valve you have ordered will just vent to the open air and has no provision to operate the auto idle piston. What you need is this.
    https://www.pilotair.com.au/product/...-down-pistons/

  5. #35
    Join Date
    Sep 2011
    Location
    Ballarat
    Age
    65
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    Hi Gazza
    on my compressor I have one of these and it hasn't missed a beat for nearly 20 years now. It cuts in and out bringing the engine up to full revs then down to idle at full pressure which in my case is 100 psi.
    I did a short video of it in action which I can post if you like

    Phil
    VideoCapture_20190908-101719.jpg

  6. #36
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    666

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    Hi Gazza,

    I agree with droog. It sounds like a 3/8 BSP thread, which is very common on small airline and gas fittings. A 3/8 BSP thread has 19 threads per inch, so nothing in any of the ordinary tap and die sets is likely to fit, and many lathes won't cut this thread. 3/8 BSP taps and dies are readily available separately though. Some of the cheapies don't hold up well cutting threads in steel, but are OK for brass.

    Frank.

  7. #37
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    Aug 2009
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    Sydney, NSW, Australia
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    Thanks guys i will order the BSP 3/8" fitting, i was about to order this https://www.ebay.com.au/itm/Air-Comp...MAAOSwdfVcYT80 and a "idle down piston" connects to the little hole on the side than the other end goes to the throttle

    i am thinking of making my own air manifold from 36mm round aluminium machine alloy i will put it on the lathe to drill the hole strait thru the center any idea what size drill bit i need for the BSP 3/8" fitting? will look for a tap now

  8. #38
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
    Age
    67
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    362

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    Instead of buying a tap it might be cheaper to buy black steel (not galvanized) reducer bush.

  9. #39
    Join Date
    Oct 2008
    Location
    Cairns, Q
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    666

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    Quote Originally Posted by gazza2009au View Post
    Gazza, that fitting has NPT threads, an American standard not interchangeable with BSP threads. The rest of the world uses BSP threads though they sometimes have other local names, but, as with metric dimensions, the Yanks are mostly sticking to their old standards. You can probably buy adapters but............as a former Prime Minister once remarked - life wasn't meant to be easy!

    Frank.

  10. #40
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    Sep 2005
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    any idea what size drill bit i need for the BSP 3/8" fitting?
    I am sure you could find the exact information online with a quick google search.



    Or just follow the link already provided which has this exact information included.

  11. #41
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    Aug 2009
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    Sydney, NSW, Australia
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    This is how i am thinking of setting it up the manifold will have different size holes and thread taps to suit whatever is going in the hole, the holes on the manifold will vary from the gauge being i think 1/4" the outlets will be 1/2" the manifold intake will have to be something that suits the BSP 3/8" fitting

    i cut the base plate today out of 4mm alloy plate i never realized how incredibly hard it is to bend 4mm aluminium i bent 1.6mm in my bender quiet easily
    Attached Images Attached Images

  12. #42
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    Yeah i should be able to work it out Droog i will jump on ebay and buy some thread gauges

  13. #43
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    Sep 2005
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    Hi Gazza not quite sure why you need thread gauges in relation to the question asked?

    The link I provided give directly both imperial and metric measures for the threads. First is that to complicate things BSP is available as T (taper) or P (parallel), for your instance I would hazard a guess that it is taper.
    For 3/8th BSPT internal of the female thread is 14.7 mm or 0.59 inch, if you happen to have BSPP then it is 15.2 mm or 0.60 inch.

    Yes I am sure that somewhere there is “correct” size drill giving a certain amount of undersize for the tap to cut out but I would just use 14.5 or 15 mm depending on BSPT or BSPP.

  14. #44
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
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    67
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    362

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    14.75 for BSPT
    15.00 for BSPP Rc series parallel
    15.25 for BSPF G series fastening

    Down load one of the million tapping and drill charts from the net.
    Print it out and hang it on your workshop wall for easy reference.

  15. #45
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    Sydney, NSW, Australia
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    Guys im getting confused i did look at that link but couldnt work it out, my male measures 15.5mm none of those sizes mentioned

    All i really need to know is the tank fitting thread the other threads i should be able to work out when i buy the items off the internet will have it in there descriptions

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