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Old 06-08-2013, 12:58 PM   #11 (permalink)
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Originally Posted by y0da900 View Post
That may be the feedneck threading, but the feed port in the body may not be the correct size to just go at it with a tap, it probably needs to be opened up a bit and doing that with a drill is likely to tear into the area where the o-ring behind the breech sits.

I'll go get some measurements in a bit.
yoda, do you know anyone who could do this?
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Old 06-08-2013, 01:28 PM   #12 (permalink)
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I don't believe it is a good idea to do it with XE threads - classic Ion is another story though. I can do that easily enough, just can't fit it into the schedule right now. tjd10684 would be my suggestion, as I know he has thread milling capabilities and does nice work. Trying to tap something that large with that low a number of threads is asking for trouble.

The minor diameter of 7/8"-32 2B threads is .841" - .849". The diameter of the feed bore on the body is .732" - it would need to be bored out. By the time it is bored out, and you have threads that are entirely inside the body (i.e. not poking through the sides because the material was too thin) you have less than 3 threads worth of engagement before you are into the main bore of the body.

Classic feednecks are 13/16"-32 - still requires boring out the feedneck area. You have better than 4 threads worth of potential engagement with that thread size. That, and the threading is less likely to disrupt the area where the rear breech o-ring sits.
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Old 06-08-2013, 01:43 PM   #13 (permalink)
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I'm not concerned with the type of feedneck. Just that it can be done.

So, I am looking for the best recommendation. As I have 3 enemy's I want done.
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Old 06-08-2013, 01:55 PM   #14 (permalink)
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I would go with classic Ion threading - 13/16"-32. Should fit fine (see classic Ion as example), give you adequate thread engagement, and should be doable by someone with thread milling capabilities (which I know tjd10684 does, and seems to have more project time available than I do).

Quote:
Originally Posted by ZDSPB

"The threading is close to a standard 13/16-32 thread size, however slightly different dimensions are often used to compensate for anodizing thickness and other considerations. "
I've got a 13/16"-32 tap that I've used on the MCB open source gun body combined with an Ion feedneck and it worked fine - but that body let me tap through to the bore, not stop on a shelf like it should in an Ion.
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Old 06-08-2013, 02:01 PM   #15 (permalink)
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Thanks for the info Yoda. I've just sent an email to tjd10684.
I know there are other Enmey users waiting for the outcome of this experiment, so they can start using other bodies as well.
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Old 06-08-2013, 11:24 PM   #16 (permalink)
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I'm interested in seeing how this works out. Personally I'm just not using any body shell.
Later,
Blackrain
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Old 06-13-2013, 06:33 PM   #17 (permalink)
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I found a machine shop to do the job.
But I am ordering the Tap.

Will this be the right one?

Qualtech DWTST13/16-32P 13/16in-32 HSS Plug Tap: Amazon.com: Industrial & Scientific
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Old 06-13-2013, 07:03 PM   #18 (permalink)
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It's the right size, but needs to be a bottoming tap.
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Old 06-13-2013, 07:16 PM   #19 (permalink)
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Quote:
Originally Posted by y0da900 View Post
It's the right size, but needs to be a bottoming tap.
One of these then:

13/16-32 HS BOTTOMING TAP *SPECIAL* | Drills And Supplies
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