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6th Sep 2019, 07:47 PM #31Most Valued Member
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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
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7th Sep 2019, 11:14 PM #32Most Valued Member
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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
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8th Sep 2019, 09:59 AM #33
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
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8th Sep 2019, 11:05 AM #34Most Valued Member
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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/
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8th Sep 2019, 11:24 AM #35Most Valued Member
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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
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8th Sep 2019, 12:29 PM #36Golden Member
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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.
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8th Sep 2019, 04:30 PM #37Most Valued Member
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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
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8th Sep 2019, 05:03 PM #38Senior Member
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Instead of buying a tap it might be cheaper to buy black steel (not galvanized) reducer bush.
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8th Sep 2019, 06:10 PM #39Golden Member
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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.
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8th Sep 2019, 06:19 PM #40any idea what size drill bit i need for the BSP 3/8" fitting?
Or just follow the link already provided which has this exact information included.
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8th Sep 2019, 06:36 PM #41Most Valued Member
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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
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8th Sep 2019, 06:55 PM #42Most Valued Member
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Yeah i should be able to work it out Droog i will jump on ebay and buy some thread gauges
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8th Sep 2019, 07:12 PM #43
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.
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8th Sep 2019, 08:01 PM #44Senior Member
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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.
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8th Sep 2019, 08:17 PM #45Most Valued Member
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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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