GTA
All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: aPpYe on December 06, 2022, 09:59:26 PM
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Hi All,
I am (quite slowly) rebuilding my .177 long gun. I'll finish it sometime before I keel over in a few decades. Theoretically! :D I put this here because it seems a little more appropriate than in the Darkside forum.
So! I like open sites, and I plan on tapping a hole and mounting the front site into a Hatsan air stripper. The stripper will be threaded onto the barrel and locked in place with a nut. Other than eyeballing it, is there a nice, methodical way of clocking it nicely to the tippy top of the barrel? Otherwise, it is potentially less than perfect and I will be sad. :(
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Maybe "clamp" the gun/stripper in some kind of fixture with vertical jaws, and then measure from each jaw to the center. When equal from each side, you should be top dead center. Never tried it. Just my brainstorm.
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Get some small scope levels put one on the receiver and match that with one where you plan to mount the front sight, mark dead center level drill and mount.
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Maybe something like this.
(https://www.gatewaytoairguns.org/GTA/MGalleryItem.php?id=8743)
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Is the air stripper steel?
Have a gunsmith “sweat” the front sight on for you.
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Maybe "clamp" the gun/stripper in some kind of fixture with vertical jaws, and then measure from each jaw to the center. When equal from each side, you should be top dead center. Never tried it. Just my brainstorm.
TDC! That's the term I was looking for. Much better than "tippy top" ... I should have thought of that, having worked with quite a few engines in my time!
Get some small scope levels put one on the receiver and match that with one where you plan to mount the front sight, mark dead center level drill and mount.
Ah ha! That makes sense. I like this, and I already have a few levels! Well, they're from dollar store carpenter levels that I broke apart for the vials anyway. I already have one epoxied to the back of my rear site just under the eye hole. Just get the bubbles matching and I am good! This sounds right.
I think I'll be doing a variation of this. The mounting location itself will be arbitrary, as the stripper will be held against a lock nut. This way, I can clock the stripper so it looks nice, then lock it in place. I will have the v-block lined up with the site hole, then lock it in once it is level!
Maybe something like this.
I like your illustration. Where did you find it? The V block will allow for a more precise TDC.
Is the air stripper steel?
Have a gunsmith “sweat” the front sight on for you.
It is non-magnetic, so probably aluminum. I want to do everything myself anyway.
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Something like the picture I posted is easy to make!
We did things like that for Wood working on chairs and Stair rails.
Table saw and a drill press is all you need.
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Leave it loose until you get to the point of shooting. Set the rear sight centered and the front to what looks about right. Shoot a group and see which way it needs to go. Get it close then lock it down. Now fine tune with the rear.
Just another suggestion.
Dave
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Something like the picture I posted is easy to make!
We did things like that for Wood working on chairs and Stair rails.
Table saw and a drill press is all you need.
yep. I looked up several videos on squaring bits of lumber, just so I can make a nice square v-block, and I am in business. I'll do that just as soon as I get off my butt ...
Leave it loose until you get to the point of shooting. Set the rear sight centered and the front to what looks about right. Shoot a group and see which way it needs to go. Get it close then lock it down. Now fine tune with the rear.
Just another suggestion.
Dave
I have to disagree on that one. Doing it this way would be fine for a specific distance, but then groups might move right or left when increasing or decreasing distance to the target.