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Forums › General › Paintball talk › Bolt Milling & O-Rings

Bolt Milling & O-Rings
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faus7rav3n
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PostPosted: Wed Sep 12, 2012 6:57 am    Post subject: Bolt Milling & O-Rings

So, I have an Azodin Zenith as my main gun right now, until I get my LPM up and running full tilt. Like an idiot, I wanted to upgrade my gun and bought the TechT Hushbolt. It's a nice piece of kit, looks snazzy, works great, until you cut an O-ring. Here is a rough cross section example of the Bolt for those unfamiliar with it.

[|XXX/]=[|XPX]

Vertical and Diagonal lines represent O-rings, if you can envision what I'm depicting.

When I pulled the bolt out to lube the gun after play, I looked close at the second o-ring the diagonal one and noticed that the o-ring, on the top of the bolt doesn't protrude past the edge of the o-ring lands thus defeating the purpose of having that seal forward of the air inlet cavity (the area between the second and third o-ring). The angle of the milling and the o-ring stretching to fit this extended gap is causing this and I don't think a larger o-ring will help.

Keeping that in mind, I was wondering if milling the stock delrin bolt to accept some 015 o-rings in a similar fashion would be a worthy idea. I know some have done it with their PM's and Bushies and my Spyder Fenix has a similar configuration forward and aft of the bolt inlet hole.

The catch: I don't have access to a lathe to turn down an o-ring land. I can probably get my hands on a pair of electronic calipers to measure depth and maybe some hand tools, but beyond that not much. Any ideas on how I might be able to accomplish this without sending the bolt off to someone or having a machinist charge me a silly amount for the services.

Thanks,
Tim
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Martix_agent
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PostPosted: Wed Sep 12, 2012 7:38 am    Post subject: Re: Bolt Milling & O-Rings

you got a drillpress or a way to clamp a drill down? that's going to be your best bet.

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faus7rav3n
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PostPosted: Wed Sep 12, 2012 8:16 am    Post subject: Re: Bolt Milling & O-Rings

Sadly, no I don't have access to something like that. I'll have to look into it. You think this is worthwhile? Just looking to quiet the gun down a touch, maybe get a bit more efficiency, what little there is to have with one of these. Right now it sounds like a damn cannon even from behind it.
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eviladam
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PostPosted: Wed Sep 12, 2012 2:35 pm    Post subject: Re: Bolt Milling & O-Rings

Harbor Frieght has a drill press for 35$, i have literally had one from them for 9 years and it just wont die. If you picked that up you could chuck the bolt via long bold threaded into the back and use a file to cut for oring lands.

I personally would not do this without something that spins the bolt. If you try to do this with hand tools you will end up with flat spots in your oring lands.
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Nobody
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PostPosted: Wed Sep 12, 2012 4:58 pm    Post subject: Re: Bolt Milling & O-Rings

get a piece of all thread(or long bolt with the head cut off) the same size as the bolt pin screw. thread that in the back. get a washer(flat or body washer) and a nut. thread the bolt in the bolt, attach washer and thread on nut, get it good and tight. chuck all thread in drill. spin it up. place drill in a vice or something to steady it. use a U shaped wood tool like a chisel and take SMALL slits off. make a groove and then check with a caliper. repeat as necessary.

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faus7rav3n
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PostPosted: Wed Sep 12, 2012 8:41 pm    Post subject: Re: Bolt Milling & O-Rings

Thanks for the insight guys. I might actually have access to a lathe, we have a 'hobby shop' on my installation (AF Base). I'm not sure how happy they would be with milling plastic off of it, but regardless the media, it's still a lathe. Might be able to hook that up. Either way it seems I'll either have to pick up some tools or find someone that can help me with it. Quite interested to try this.
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