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PostPosted: Sat May 16, 2020 1:25 pm 
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Joined: Fri Jan 22, 2010 1:17 pm
Posts: 2228
Location: Kingston, ON
So today I set out to replace the non-functioning gauge on a Hatsan AT44 pressure tube with a shiney new one given to me by Lauchlin (thanks again). I started earlier this week making a thin wall socket to remove the old gauge. Since I'm locked out of work due to Covid, I have no access to lathe so I had to use what's at hand in my home workshop, in this case power drill and belt sander. I put a 3/8 bolt and nut through a 7/7" standard socket and turned it down to an OD of about 26.6 mm ( 1.05"). It worked great.
Attachment:
Thin wall socket.jpg
Thin wall socket.jpg [ 350.53 KiB | Viewed 91 times ]


Then on to remove the gauge, took little effort but found some interesting parts inside:
Attachment:
Main tube .jpg
Main tube .jpg [ 417.39 KiB | Viewed 91 times ]

Attachment:
Old gauge parts.jpg
Old gauge parts.jpg [ 202.5 KiB | Viewed 91 times ]


Then I tried to install the new gauge, and found that the threads were totally different. It could be made to fit, but I'd need a machine shop to make a new brass threaded insert. The threads for the Hatsan gauge are 1/8" BSP (OD 0.375 and 27 tpi), The New gauge threads are 0.3095 and a different pitch. I'm guessing a metric thread, maybe a M8? Pics to follow.

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PostPosted: Sat May 16, 2020 1:30 pm 
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Joined: Fri Jan 22, 2010 1:17 pm
Posts: 2228
Location: Kingston, ON
The new gauge:
Attachment:
air.jpg
air.jpg [ 26.75 KiB | Viewed 90 times ]


And its threads:
Attachment:
New Gauge (2).jpg
New Gauge (2).jpg [ 592.03 KiB | Viewed 90 times ]


Versus the Hatsan gauge threads:
Attachment:
Hatsan Gauge.jpg
Hatsan Gauge.jpg [ 584.71 KiB | Viewed 90 times ]


I'll have to wait for lockdown to be lifted and then make a new threaded insert to fit the new gauge. :drinkers:

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