What’s Going on with my Shroud?
Appreciate any insight or help…
Just realized that my shroud now takes about an additional 1/4 turn to be tight on the barrel. Ever since I purchased it back in July, the shroud has always been firmly on the barrel with the visible shroud set screws at 180 degree plane to the barrel…they are now 90 degrees with the + 1/4 turn.
Anyone have any ideas on what may be causing this? It is not temperature related. Is there anyway the barrel can move position…extend beyond the breach a hair?
Thanks
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Are you saying that screw is completely disengaged from the barrel when it is flush?
If it is still partially in the barrel, then it locks the barrel from moving.
If it is completely disengaged, then nothing would be holding the barrel in the breach except friction.
Which is it?
Not really. That screw is for finding the correct location and once done it should be backed out flush with the breech Surface or it´ll force the barrel downwards. Not good for the load probe and load probe o-ring.
Thanks elect, lurker, guykuo…my shroud end caps are tight and the set screws are OK. The barrel is not loose and no power loss. Guykuo, believe you are correct that the block that the rear of the shroud butts against must have shifted slightly. Have never had my gun disassembled so didn’t realize that this block was not a solid part of the breach.
The actual shroud alignment is not a big deal for me but was concerned that something was going on that would ultimately effect performance.
Barrel shouldn’t be moving relative to breach block since it is locked in place by its grub screw into the barrel index hole.
However, we aren’t actually cinching up against the barrel and breach block directly. There are a couple pieces in between that can shift.
The amidship mount is held in place only by its bands and the top barrel cover. The rearward pressure of the shroud, could shift those
backwards slightly. A tiny bit of shift would translate into a change in shroud’s “tightened” position.
Also, there may be compression of where the shroud pushes against the amidship mount.
I doubt the change is significant unless you have loose screws on the tension bands.
Probably, your the course is to simply place an o-ring on the barrel, between the shroud and amidship mount.
Compressibility of the o-ring will let you snug the shroud in any position you wish.
That begs the question….
Do shroud and barrel tension alter barrel harmonics on a Vulcan?
If it does, I suspect it is an effect far too small to detect with my hold.
Currently, I leave my shroud loose rather than snug tight because I can’t standardize the amount of tension.
I can however, standardize the loose position.
Clamping down the gun and testing grouping with tight vs loose shroud may prove interesting.
Both the end caps being loose has nothing to do with it. The threaded part is inside the shroud held in place with the Allen screws we see on the shroud. Take the Allen screws out and rotate shroud and see if you can re align it that way. My shrouds has holes drilled on bottom so for me it would be a problem
Check that the shroud rear endcap is tight. Maybe it didn’t get tightened the last time you had the shroud off.
Or maybe it just worked loose. My shroud front endcap loosened on its own after many shots.
Or maybe the two shroud grub screws are turned ia little to far ❓
That’ all I can think of.
I’m wondering if barrel can rotate. But I guess you would loose power at the same time due to a miss aligned transfer port. I take mine off every time I clean barrel and so far so good.
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The second option,with a caveat : The barrel is kept in place with those four clamping screws – like on a Cricket.
Don’t believe me on this? Ask Evgeny. 😉