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PostPosted: Sun Jul 28, 2013 2:54 pm 
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Joined: Sat Jan 12, 2013 6:08 pm
Posts: 117
I need to upgrade the hardware on my discovery valve. I know I have to change the 8/32 OEM screws out and replace with 10/32 shcs high tensile items

Is it a case of running a #21 tap drill down and cutting a new thread with a 10/32 bottom tap?

I haven't done the sums, but is there any of the existing 8/32 threads left after the tap drill?

I have concerns about doing it correctly with safety being paramount.


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PostPosted: Sun Jul 28, 2013 4:12 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
In theory, if perfectly centered, the #21 drill will just remove the 8-32 threads, in practice you can often see a faint outline of them.... Accuracy in the location of the holes and 10-32 screws is paramount, so that all three screw heads take equal load in the holes in the tube....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sun Jul 28, 2013 4:35 pm 
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Joined: Sat Jan 12, 2013 6:08 pm
Posts: 117
Thanks Bob.

So, if I can pick up the original threads exactly, if crosman have it right, they should be correct right?

Also, do you put any 10/32 screws in the fill cap when filling to higher pressures?


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PostPosted: Sun Jul 28, 2013 4:37 pm 
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Location: Coalmont BC
The fill cap threads into the inside of the tube.... no strength problem there, providing the O-ring seal is inside the threaded portion where the tubing wall is full thickness.... as it is on a Disco....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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