GTA
All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Optics, Range estimation & related subjects => Topic started by: GatorCountry on February 08, 2019, 06:30:02 PM
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Is there a point on the tube where the scope rings could damage the scope mechanism - such as too close to the focus/power ring?
I was trying to get a few more millimeters out of a pointer for a comma wheel attached to the scope ring and had moved the rear mount (of a two piece set) pretty close to the focus ring. A friend stated that could damage the internals. I'd never heard that before, so...
Within normal torque settings for the rings - any risk? I've never heard of it or seen warning by a manufacturer.
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Not particularly. I try to keep them away from the magnification bezel and the adjustment turrets if I can but on some scopes, there is not a lot of room. Just put them where you can easily manipulate the functions of the scope and the gun. You should be good.
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What you get is a before and after situation. Check function of moving turrets, elevation, windage, and parallax. Check magnification ring also. They should all function normal after torquing scope rings. If the turrets or magnification ring binds or doesn't turn after torquing the scope rings, loosen the scope rings.
Some rifle scopes have thin soft aluminum tubes that bend and crease as the scope rings tighten, putting stress on internal parts. Causing the rifle scope turrets to bind or not turn at all. Some rifle scopes are forgiving and function normal afterwards and some don't.
You torque your scope rings and take your chances, best advice follow manufacturer's torque specifications and that can still cause problems. Good luck ;)
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I'm working on tearing down an old Tasco scope. I'm not quite into the eyepiece end far enough for useful pictures, but I can describe what I've seen so far. After unscrewing the eyepiece completely off the scope (think like you are focusing, just keep going. I didn't find any limit screws on this scope.), you can see the crosshair "unit." It is just screwed inside of the main tube, but possible onto the end of a inner tube.
This inner tube is the optical assembly for your zoom, windage and elevation adjustments. Windage and elevation turrets are in the middle of the scope, but this tube extends inside the scope body to just past the turrets. Adjusting these moves that end around, moving your point of aim. It is spring loaded so it follows the turret at all times.
Back at the zoom end, on my scope there was a single screw on the magnification bezel/ring. It actually acts as a pin, coupling the ring and the zoom optics. Removing it will allow you to slide the ring off the scope tube. On my scope, this exposed four more screws that hold that inner tube in place. That inner tube actually pivots about some point near these screws, but I haven't extracted the tube yet to see how it is done. It is well clear of any scope rings.
Likewise that inner tube is pretty well clear of the inside of the scope body in order to allow it to be adjusted for point of aim, so only a really huge ding or crimp is going to limit that motion. The zoom feature uses another tube inside that inner tube that rotates with the zoom ring via that single screw I mentioned. Somewhere inside is another pin in one of these tubes and spiral slot in the other so that turning the zoom ring causes one or more lenses closer to the turrets to move along the inner tube. This changes the magnification.
When I get mine apart the rest of the way, I'll create a posting with an exploded view. Right now I'm trying to remove the objective lens so I can give that inner tube a little push out the eyepiece end. I took out the four screws and have managed to wiggle it some, but I need to get at the other end.
This link has some blurry pictures, but you can clearly see a "ball" joint of sorts under where the zoom ring goes in his second cutaway picture: http://bulletin.accurateshooter.com/2015/09/cutaway-weaver-scope/ (http://bulletin.accurateshooter.com/2015/09/cutaway-weaver-scope/). That's a weaver scope with more optical parts than my Tasco, but the essentials are the same. If you look carefully at his first picture, you can see the two inner tubes in side the main tube between the turrets and zoom ring. And I think I see a cross section through one or two of the spiral slots too.