Author Topic: Pressure gauges  (Read 499 times)

Alan

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Pressure gauges
« on: May 29, 2019, 05:06:50 AM »
I received an email from Wika Gauges, and one of the links given is this one:
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Let's face facts. The gauges on most airguns are cheap, Chinese-made junk. As such, you get what you pay for, and that is, poor calibration and linearity. It is for this reason, that I paid nearly $75 each for two, class 4 gauges, now installed on my WAR Cobra. I also purchased a 3 inch calibrated gauge (±1%) from them (≈$100). Fitted with the correct Foster fittings, I can use this gauge to check the calibration of the pressure cutoff on my compressor. This leads to a question. Have you ever checked your compressor's calibration against a known-good gauge? When and if you do, you might be in for a shock, especially so if the compressor is a cheap Chinese one!
« Last Edit: May 29, 2019, 06:00:39 PM by rsterne »


  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Frank in Fairfield

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Re: Perssure gauges
« Reply #1 on: May 29, 2019, 05:42:53 AM »
No matter.
I am using a cheap Chinese Computer, camera, TV, refrigerator, car parts, shirts, pants, shoes, earphones, etc!
AA TX200 MKIII, .177
Baikal IZH46M w/Steve Corcoran Furniture
Beeman R1, San Rafael, .177
Benjamin Sheridan Blue Streak, Williams Peep
Benjamin Marauder Gen I, .177 w/Boyd's Stock
Benjamin Marauder Gen I, .22   w/Boyd’s Stock
Benjamin Marauder Gen I, .25   w/TEREX Stock
Crosman 1720T, Steve Corcoran furniture
Crosman 2300S, Alchemy Walnut Grips
Daisy Model 25, Variant #7
Daisy Red Ryder
FWB300S
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steveoh

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Re: Perssure gauges
« Reply #2 on: May 29, 2019, 06:45:28 AM »
I received an email from Wika Gauges, and one of the links given is this one:
/>
Let's face facts. The gauges on most airguns are cheap, Chinese-made junk. As such, you get what you pay for, and that is, poor calibration and linearity. It is for this reason, that I paid nearly $75 each for two, class 4 gauges, now installed on my WAR Cobra. I also purchased a 3 inch calibrated gauge (±1%) from them (≈$100). Fitted with the correct Foster fittings, I can use this gauge to check the calibration of the pressure cutoff on my compressor. This leads to a question. Have you ever checked your compressor's calibration against a known-good gauge? When and if you do, you might be in for a shock, especially so if the compressor is a cheap Chinese one!

I was wondering about who might have a device or manifold for hooking up all your gauges at once, and testing their consistency.

I have a gauge either failing or clogged up on my Sumatra, and now I don't trust the thing.  I guess I need to dump the air, remove the gauge and see if it's got a booger clogging up the works. Shot at a rat last night, and missed. Though my gauge is saying it's almost at 3k psi, the gun has started shooting low. I think I've put half a dozen shots through the gun since last fill, and the gauge should be reading lower, but it's not. 

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Alan

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Re: Perssure gauges
« Reply #3 on: May 29, 2019, 09:24:39 AM »
Frank, the issue is similar to reloading rifle cartridges. Imagine what would happen if your powder scale was off 10%?
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

caniborrowsomeammo

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Re: Perssure gauges
« Reply #4 on: May 29, 2019, 01:59:55 PM »
I use the gauges on my guns as a reference as to when they need a fill. I use my tank out- fill gauge to fill to pressure needed on each gun.
My tank pressure gauge matches my cutoff @ 4600 psi on my compressor.
I also have a fill station that I use with my little tank, and have a Wika gauge on it that is reasonably accurate. I have hooked it in line with my tank out gauge and it is within <1% IIRC.
I guess if I was to start shooting strings and worrying about fpe per ci. I would need more accuracy in my gauges, but nowadays I have quit overthinking things and just shoot.
Buncha BB guns that I don't get to shoot as much as I like. Grinding out a living on the farm.

Frank in Fairfield

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Re: Perssure gauges
« Reply #5 on: May 29, 2019, 04:54:11 PM »
Apples and oranges.
I get 85-90 shots on 3000psi with the .177 Marauder.
30 with the .22
16 with the .25
25 with the 1720T
I don’t need a gauge to count shots...
Note: The gauges on both of my tanks match the pressure on all of my pcp arms...
« Last Edit: May 29, 2019, 04:57:10 PM by Frank in Fairfield »
AA TX200 MKIII, .177
Baikal IZH46M w/Steve Corcoran Furniture
Beeman R1, San Rafael, .177
Benjamin Sheridan Blue Streak, Williams Peep
Benjamin Marauder Gen I, .177 w/Boyd's Stock
Benjamin Marauder Gen I, .22   w/Boyd’s Stock
Benjamin Marauder Gen I, .25   w/TEREX Stock
Crosman 1720T, Steve Corcoran furniture
Crosman 2300S, Alchemy Walnut Grips
Daisy Model 25, Variant #7
Daisy Red Ryder
FWB300S
HW35E, .177, Beeman/Williams Peep/12fpe VORTEK
RWS Diana 52, .177
Bug-a-Salt

sixshootertexan

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Re: Perssure gauges
« Reply #6 on: May 29, 2019, 05:16:57 PM »
I'm old and can't remember to count the shots.  I'm in need of a new nano gauge for my .177 with the Ninja regulator. The glass is cracked on it.
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177, Custom regulated .177, 850 Hammerli .177

ba49

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Re: Pressure gauges
« Reply #7 on: September 06, 2019, 02:51:26 PM »
  I just ordered a 4" Wika 5000 psi. gauge to calibrate my shutoff on my Air Venture compressor. I don't have a fill tank so I have to rely on my compressor shutoff when filling my Alfa Proj (which has no built in gauge). I'm new to pcp and don't want to screw up. Not to sure how accurate the compressor gauge is. What kind of adapter do I need to get from 1/4" npt male( on the gauge) to male 1/8" foster for the compressor.
  • Cleveland, ohio

caniborrowsomeammo

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Re: Pressure gauges
« Reply #8 on: September 06, 2019, 05:09:24 PM »
   What kind of adapter do I need to get from 1/4" npt male( on the gauge) to male 1/8" foster for the compressor.

So you say you need a 1/4 female x 1/8 male, in other words, a reducer?
Like this:
https://www.breathingair.com/Product/Fittings-Accessories/Pipe-Fittings/Adaptor,%20Reducing%20(RA4-2S).aspx?ProductID=112462
Buncha BB guns that I don't get to shoot as much as I like. Grinding out a living on the farm.

ba49

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Re: Pressure gauges
« Reply #9 on: September 06, 2019, 06:13:25 PM »
  I was told the 1/8" male thread is a British thread? A BB or something? The Foster fitting at Pyramyd Air uses that thread I was told. I'm fairly knowledgable about bolt and pipe threads but this pressure stuff is all new to me. Does someplace have good quality HPA Foster fittings that use standard NPT female threads?  I do know I want to buy quality fittings and not crap to save money.
  I used to do a lot of plumbing before I retired (maintenance foreman) and can't believe how cheezy the valves and fittings are when you go cheap. I don't want to risk injury to myself or others with inferior fittings. Any advise as to what to avoid?
  • Cleveland, ohio

caniborrowsomeammo

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Re: Pressure gauges
« Reply #10 on: September 06, 2019, 09:09:48 PM »
BSPT (British Standard Pipe Thread) is a straight thread unlike NPT, a taper thread. BSPT used a seal, in our case a Delrin (usually) ring between the connection to seal.
Foster fittings come in NPT and BSPT. And perhaps others, but we are talking about these two.
If you want to use an NPT foster you won't need to adapt to BSP. Unless your compressor head is tapped BSPT.
In your original question, I understand you want a female fitting for the gauge, but I don't understand whether you want a male or female end for the foster to adapt to. Ex.-1/4 FPT x 1/8 MPT.  Or 1/4 FPT x 1/8 FPT. Or, 1/4 FPT x 1/8 F BSPT or M BSPT.
I haven't bought fittings in years but I bought from a place in TX, they had every fitting imaginable and at a fair price, I don't remember the name though, AND I knew the fittings I needed. All rated minimum 6000 psi or better.
For you, a good source of quality, U.S. made, air fittings are available from JoeB, you can give him a call to get exactly what you need. - http://www.airtanksforsale.com/
« Last Edit: September 06, 2019, 09:17:55 PM by caniborrowsomeammo »
Buncha BB guns that I don't get to shoot as much as I like. Grinding out a living on the farm.

ba49

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Re: Pressure gauges
« Reply #11 on: September 07, 2019, 06:51:14 AM »
Thanks for all the info. I understand it now. The Foster fitting I need would be a male. I have a female on the compressor hose to plug into my guns.
  • Cleveland, ohio

steveoh

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Re: Pressure gauges
« Reply #12 on: September 07, 2019, 07:19:49 AM »
I have gotten fittings from:

Amazon - mostly absolute crap with horrible threads. I sent them back. I fear that if I'd use these they'd blow off under 4500psi.

Ebay - some good, some horrible Chinese Crap.  These folks had some good fittings: https://www.ebay.com/str/efuelpumps. They also have a website with more offerings.

AirVenturi - I have a couple fittings I had to retire after a couple month's use due to scarring of the male foster end. They couldn't possibly be rated for over 3k psi.

AirHog - Great fittings, flipping expensive.

AirTanksPlus - Great fittings. https://airtanksplus.com/product-category/pcp-airgun-fittings/ I bought a handful at the Pacific airgun show.

There's a British company I bought a micro bore hose and a bunch of fittings from. Very high quality stuff, and good pricing. For the life of me I can't find that site now. I'll keep looking though.

These folks have tons of fittings: http://www.northshorecompressor.com/categories/Fittings/

AliExpress - For freaks sake, I order stainless and get brass. They look nice, but I've had one blow up. I did get some stainless fittings for M8 male to male foster that were perfect. The brass fittings and some stainless fittings with male / female foster ARE NOT COMPATIBLE with our Foster fittings most airguns have.  This is a problem. The last order I placed had 4 out of 5 fittings not be compatible or have crummy threads, or be made of brass. I complained, and filed dispute, and they refunded most of my money.

Hot Tip for AliExpress. If something is damaged in shipping due to poor packaging, or you don't get what you wanted, or it is inferior, then FILE DISPUTE. If the store representative asks you to retract the dispute tell them nope. Because once you retract, you have no recourse and the store rep will dick you around until the cows come home. Filing a Dispute gives you power. Keep that power until you are satisfied.
  • Benicia, California
Quackenbush .58 Outlaw
Shooting Chairs
Vallejo Ferry Schedule
DAQ .458 LA Outlaw Rifle
Sam Yang 909s .45
Sam Yang Sumatra .25
RWS Diana 350Magnum Compact Pro .22
QB-79 .177
Crosman 1322
Crosman 1377 - HoRodded 10 FPE
Diana Model 27 (childhood airgun)
Tolman Skiff
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bnowlin

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Re: Pressure gauges
« Reply #13 on: September 07, 2019, 02:34:37 PM »
The fittings I got from outdoor guy on Amazon were great Steveoh.  I had no problem at all and got them the next day on Prime.
Bobn