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What causes cross hairs to cant?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2013 at 21:58
mickey View Drop Down
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Hi,
 
I have a pretty decent scope that came with a lifetime warranty. Last weekend I was out doing some long distance shooting and noticed the cross hairs had canted ever so slightly but enough to be disturbing.
 
I took it off the rifle, and not gently, but not with any great force, started tapping it against my palm, checking it, and tapping some more. And the cross hairs went right back into position!
 
How is it cross hairs can move around like this?
 
Now, since I have them back into positon, I'm afraid if I send it back, they will return it to me saying, "There's nothing wrong with this scope. The cross hairs are fine."
 
And yes, I've been tapping the lens again trying to get them to go out of whack like before but of course they're not budging.
 
Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 07:52
SVT_Tactical View Drop Down
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Something sounds loose, call the manufacture and send it in.  Sounds like the reticle has come loose. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 08:24
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Originally posted by SVT_Tactical SVT_Tactical wrote:

Something sounds loose, call the manufacture and send it in.  Sounds like the reticle has come loose. 
 
This.
 
If they're a reputable company, they'll fix it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 08:33
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 I had the same issue with a Bushnell scope my SIL had.  Erector tube/assembly came loose.  Sent it in and had a new one in less than 3wks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 09:15
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I was about to respond, "Leupold causes crosshairs to cant", but realized that, on very rare occasions, other manufacturers suffer from the same thing.

The manufacturer should fix it.  There are many causes, only they can tell you which is related to yours.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 09:17
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Concerning what causes it...

Some reticle cant is present in some scopes right out of the box. The degree to which it is noticeable varies with the manufacturer's angularity tolerance specs. It's the result of the combined tolerance stackup inherent between the dimensional tolerances of mating parts and the capable precision of the mfg's machining, fabrication, and assembly operations, coupled with the location precision of the fixturing used for production and assembly.

If the cross hairs were initially true, then became canted later, this is the result of poor mechanical design and/or poor quality control, more commonly seen in cheap scopes.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 13:49
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Originally posted by RifleDude RifleDude wrote:

Concerning what causes it...

Some reticle cant is present in some scopes right out of the box. The degree to which it is noticeable varies with the manufacturer's angularity tolerance specs. It's the result of the combined tolerance stackup inherent between the dimensional tolerances of mating parts and the capable precision of the mfg's machining, fabrication, and assembly operations, coupled with the location precision of the fixturing used for production and assembly.

If the cross hairs were initially true, then became canted later, this is the result of poor mechanical design and/or poor quality control, more commonly seen in cheap scopes.



LOL. That's exactly what I was thinking Ted. I mean, when those dimensional tolerances are amiss... Big Grin
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 15:11
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Okay, I'll ask; What brand is it.Big GrinBig GrinBig Grin
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 15:13
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Originally posted by mickey mickey wrote:

Hi,
 
I have a pretty decent scope that came with a lifetime warranty. Last weekend I was out doing some long distance shooting and noticed the cross hairs had canted ever so slightly but enough to be disturbing.
 
I took it off the rifle, and not gently, but not with any great force, started tapping it against my palm, checking it, and tapping some more. And the cross hairs went right back into position!
 
How is it cross hairs can move around like this?
 
Now, since I have them back into positon, I'm afraid if I send it back, they will return it to me saying, "There's nothing wrong with this scope. The cross hairs are fine."
 
And yes, I've been tapping the lens again trying to get them to go out of whack like before but of course they're not budging.
 
Thanks
 
Hey Mickey
 
I'm not sure I understand.
 
Were the crosshairs canted in relation to each other?  IOW was the vertical crosshair not at an exact 90* angle to the horizontal crosshair?
 
Were the crosshairs canted in relation to the turrets?  IOW did the vertical crosshair if extended upward not go through the middle of the elevation turret?
 
If the crosshairs were at a 90* to each other and the reticle did not appear level then that would be a scope rotation problem, which would be caused by the scope moving in the rings. 
 
If the crosshairs were canted in relation to the turrets and tapping on it made it go back into line, then that would be an internal problem within the scope and only the manufacturer can fix it
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 15:18
mickey View Drop Down
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Originally posted by BobbyH BobbyH wrote:

Okay, I'll ask; What brand is it.Big GrinBig GrinBig Grin


Bushnell Elite. I have owned them in the past and never had a problem before. I like 'em.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 15:54
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What caliber does the scope ride on?The reason I'm asking is a few yrs ago I had a Bushy Elite 4-16x50 & after 35 rds of my T/C .460 S&W mag the ret.shifted.Actually I could hear it ratteling when I would shake it.I sent it back to Bushnell & within 8 calender days I had a new scope.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2013 at 21:20
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Originally posted by RifleDude RifleDude wrote:

Concerning what causes it...

Some reticle cant is present in some scopes right out of the box. The degree to which it is noticeable varies with the manufacturer's angularity tolerance specs. It's the result of the combined tolerance stackup inherent between the dimensional tolerances of mating parts and the capable precision of the mfg's machining, fabrication, and assembly operations, coupled with the location precision of the fixturing used for production and assembly.

If the cross hairs were initially true, then became canted later, this is the result of poor mechanical design and/or poor quality control, more commonly seen in cheap scopes.


 
Good lord!.... I could carry around a 100 volume set of firearms/optics encyclopedia's and still not have the information Ted carry's around in his head!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/04/2013 at 16:27
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learn somthing new every day, i had no idea, i thought you turn the scope. lol
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