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9/22/2013 6:56:07 PM EDT
I've always been curious as to how the designers of rotating bolt guns to get all of the locking lugs flush and even contact with all points of the barrel extension....
It seems like to me there would be minor inconsistencies and uneven pressures delivered to points of the locking lugs.

If someone knows the answer...please enlighten me.
9/22/2013 7:03:35 PM EDT
[#1]
There are inconsistencies and uneven pressures. That is why lugs break sometimes, and why a bolt will wear to a certain extension over time, and why it can be a bad idea to use an old bolt with a new extension.
9/22/2013 7:14:08 PM EDT
[#2]
The trade off is a much smaller degree of rotation required for unlocking, but the bolt and barrel extension surely require  fine  machine work.
Moon
9/22/2013 7:28:49 PM EDT
[#3]
Quoted:
It seems like to me there would be minor inconsistencies and uneven pressures delivered to points of the locking lugs.
View Quote

There are.

If someone knows the answer...please enlighten me.
View Quote

Careful manufacturing and quality control.  Keep the parts as close to the exact size they are supposed to be to minimize any deleterious effects.
9/22/2013 7:31:01 PM EDT
[#4]
Quoted:
I've always been curious as to how the designers of rotating bolt guns to get all of the locking lugs flush and even contact with all points of the barrel extension....
It seems like to me there would be minor inconsistencies and uneven pressures delivered to points of the locking lugs.

If someone knows the answer...please enlighten me.
View Quote


your mechanical and physics mind has steered you correct sir

see head-spacing gauges

"go/nogo gauge"
9/22/2013 8:27:32 PM EDT
[#5]
the art and perfection of one of the worlds greatest machines  parts    the BCG  of an AR
9/22/2013 9:54:59 PM EDT
[#6]
Cutting the lugs consistent is easy, however after you cut the pocket for the extractor, you will often see the lugs next to it move by about .0002 from what we see.
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