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Author Topic: Part for air regulator  (Read 6653 times)

Offline John Rudd

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Part for air regulator
« on: January 27, 2011, 08:28:03 AM »
I need to make a part for the air reg on my compressor.

The orig threaded part where the adjustment knob screws into has worn away..Thinking I could bush it, I turned up a brass bush to silver solder in...The casting melted!!! :doh:

Anyway, I took some measurements:
The thread is approx 31.6mm in dia and pitch is between 1.25 and 1.5...I'm not sure if its metric or not. I'd have a stab at an M32 thread with a fine pitch, 1.5 ( coz there aint an M32 in coarse..) but on checking the pitch I'd say its between 18-20 tpi and as for the angle...Well my metric thread gauges dont seem to fit too well...Thing is, the item was made in the Far East, so I'd have guessed it would have been metric..

Any ideas guys?
« Last Edit: January 27, 2011, 12:38:01 PM by John Rudd »
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Offline andyf

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Re: Part for air regulator
« Reply #1 on: January 27, 2011, 09:26:00 AM »
John, it could well be 1/4" BSP which is 19tpi, and is in international use.

 :scratch: I've never understood why it's called 1/4", when it's major diameter is 0.518".

But I notice your diameter is 31 mm, or about an inch and a quarter....

Andy
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Offline bry1975

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Re: Part for air regulator
« Reply #2 on: January 27, 2011, 09:39:49 AM »
Can you not take the parts into your local air parts counter?

Bry


« Last Edit: January 27, 2011, 09:42:10 AM by bry1975 »
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Offline John Rudd

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Re: Part for air regulator
« Reply #3 on: January 27, 2011, 09:44:33 AM »
Andy,

The part in question is the bonnet of the regulator and is made from some sort of chinky alloy. It looks like it has a lot of 'silvery' looking metal in it, which I guess is why it melted so easy...Anyhoo..it screws into the main body of the regulator which is attached to the compressor air tank..Not easy to just change the reg as the air outlets are part of the whole thing and it also incorporates the relief valve....

I did order a part from a seller on Ebay, but turns out to be nothing of use...here it is ( well for the time being..)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300514050077

The top part is plastic, on removing it there are no innards!!. I was hoping ( some hope..) that it came as a drop in replacement..
« Last Edit: January 27, 2011, 09:46:13 AM by John Rudd »
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Offline bry1975

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Re: Part for air regulator
« Reply #4 on: January 27, 2011, 11:56:21 AM »
I'm sure some of the chaps will know what you need John, the last compressor I bought was a second hand Atlas Copco scroll compressor lovely bit of kit cost me about 400quid, bought her from a dentist surgery and weighed about 120kilos. :(
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Offline fixit

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Re: Part for air regulator
« Reply #5 on: January 27, 2011, 12:10:34 PM »
sorry but can't help you with your 'bit.

But just to clear up bsp

  It's called " 1/4  British standard pipe " because it originaly was a thread for a 1/4 internal bore pipe and same for 3/8 bsp ect,        BSPT    just means 'taper thread which the USA  called 'Dryseal' which is used a lot in hydraulics.


Steve
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Offline Lew_Merrick_PE

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Re: Part for air regulator
« Reply #6 on: January 27, 2011, 12:58:45 PM »
Quote from: John Rudd on January 27, 2011, 08:28:03 AM
Anyway, I took some measurements:
The thread is approx 31.6mm in dia and pitch is between 1.25 and 1.5...I'm not sure if its metric or not. I'd have a stab at an M32 thread with a fine pitch, 1.5 ( coz there aint an M32 in coarse..) but on checking the pitch I'd say its between 18-20 tpi and as for the angle...Well my metric thread gauges dont seem to fit too well...Thing is, the item was made in the Far East, so I'd have guessed it would have been metric..

Any ideas guys?

1.2500-20UN is a fairly common obscure thread that turns up.  It is the thread used on the barrel retention B-nut on M16/AR15 type firearms and is commonly tooled in China these days.  1.2500-18UNEF is somewhat less common.  A 1.25mm pitch would "almost" fit a 20 TPI thread.  A 31.6mm (1.244 inch) major diameter is well within the tolerances for a 1.2500 thread.  ???
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Offline Ned Ludd

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Re: Part for air regulator
« Reply #7 on: January 27, 2011, 01:00:35 PM »
Hi John,
Would it be possible to furnish more details of your compressor, make and model, and some pictures of the part and the body into which it fits?
Ned
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Offline jim

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Re: Part for air regulator
« Reply #8 on: January 27, 2011, 01:14:00 PM »
i might have one in the shed, i'll have a look in the morning (got to go to work now!)
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Offline John Rudd

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Re: Part for air regulator
« Reply #9 on: January 27, 2011, 02:02:31 PM »
Ned, if you have a look at the ebay link I posted, the main body of the regulator is the same as the one in the picture.. the bonnet of the reg is metal not plastic, the red knob you see would normally be the adjusted to trim the outlet pressure but the thread that it screws into has worn away hence the need to make a new one...

The compressor is a no name brand easily obtainable via Ebay.....

Many parts would need to be replaced if I were to obtain a replacement reg, so fabbing a part is an option preferred atm...

Jim, an offer of help would be much appreciated..
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Offline jim

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Re: Part for air regulator
« Reply #10 on: January 28, 2011, 07:14:32 AM »
just got up and looked in the shed, can't find one :(

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Offline John Rudd

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Re: Part for air regulator
« Reply #11 on: January 28, 2011, 08:10:37 AM »
Been out this am and checked out Machine Mart...Their replacement reg is no good, top is too big. :doh:
Went to local compressor supply outfit, they cant help either, their regs are completely different.. :scratch:

So looks like a repair is on the cards... :dremel:

Jim, thanks for the help, you can go to bed now.. :clap:
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Offline John Rudd

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Re: Part for air regulator
« Reply #12 on: January 29, 2011, 11:55:17 AM »
Filled with enthusiasm, I decided to embark on a repair...

If you wanna follow, I started a new thread...
http://madmodder.net/index.php?topic=4306.msg46989#msg46989
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