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#3398565 - 10/11/13 07:05 PM Broke a screw on the rear scope base.
WGK
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Registered: 02/18/12
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Loc: loudon

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These are Weaver Grand Slam bases. Not shooting anything different in the way of my load. I pulled the trigger and felt something hit me in the shoulder. It was the head of one of the two screws that hold the ring in place. It snapped right off and these screws are thick.
50 cal savage
42 gr n110
Hor 250 xtp
Mmp black sabot.


Edited by WGK (10/11/13 07:07 PM)
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William G Kollock

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#3398668 - 10/11/13 08:12 PM Re: Broke a screw on the rear scope base. [Re: WGK]
ratsnakeboogy
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Registered: 08/28/08
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Loc: Andersonville, TN

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I had 2 snap from being over torqued before I bought a FAT Wrench.

Did you possibly over torque them?

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#3398709 - 10/11/13 08:52 PM Re: Broke a screw on the rear scope base. [Re: ratsnakeboogy]
WGK
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I could have.
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#3398742 - 10/11/13 09:13 PM Re: Broke a screw on the rear scope base. [Re: WGK]
ratsnakeboogy
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Registered: 08/28/08
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 Originally Posted By: WGK
I could have.


A Wheeler Fat Wrench will open your eyes on how much over-torquing happens with most scope rings.

Most call for 15-20 lbs of torque, I guesstimate I used to put upwards of 40 to 50 on them free-hand.

Over-torquing plus stout recoil = snapped ring screws.

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#3398744 - 10/11/13 09:15 PM Re: Broke a screw on the rear scope base. [Re: ratsnakeboogy]
Rubberduck270
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Registered: 11/01/10
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I had one break in the safe over the off season. It happens.
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#3398763 - 10/11/13 09:30 PM Re: Broke a screw on the rear scope base. [Re: ratsnakeboogy]
KPH
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Registered: 08/06/05
Posts: 3475
Loc: Hendersonville Tenn

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 Originally Posted By: ratsnakeboogy
 Originally Posted By: WGK
I could have.


A Wheeler Fat Wrench will open your eyes on how much over-torquing happens with most scope rings.

Most call for 15-20 lbs of torque, I guesstimate I used to put upwards of 40 to 50 on them free-hand.

Over-torquing plus stout recoil = snapped ring sc rews.

I learnt a lot when I got one, it is easy I found out to over tighten.
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#3398849 - 10/11/13 10:11 PM Re: Broke a screw on the rear scope base. [Re: Rubberduck270]
pressfit
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Registered: 12/28/09
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 Originally Posted By: Rubberduck270
I had one break in the safe over the off season. It happens.

interesting.. I have never heard or seen a bolt break by itself like that... I have ran a machine shop for 30 plus years and have had everything under the sun come in to be repaired but never a bolt that broke just siting there... what do you contribute the breakage to?
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#3398863 - 10/11/13 10:20 PM Re: Broke a screw on the rear scope base. [Re: pressfit]
ratsnakeboogy
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Registered: 08/28/08
Posts: 3451
Loc: Andersonville, TN

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I tightened an old weaver ring to base setup with the crossbar connection one night and put it in the safe. Took it out the next morning to go shoot it and it was just dangling there. It had snapped in two overnight. Maybe a temp change added to an already stressed part?
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#3398917 - 10/12/13 12:56 AM Re: Broke a screw on the rear scope base. [Re: ratsnakeboogy]
WGK
WILD BILL
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Registered: 02/18/12
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Loc: loudon

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I guess I need to add a fat wrench to my list of needs. Dang this hunting stuff gets expensive. Thanks for the help fellows.
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#3398920 - 10/12/13 01:39 AM Re: Broke a screw on the rear scope base. [Re: pressfit]
Rubberduck270
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Registered: 11/01/10
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Loc: Lawrence Co.

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 Originally Posted By: pressfit

interesting.. I have never heard or seen a bolt break by itself like that... I have ran a machine shop for 30 plus years and have had everything under the sun come in to be repaired but never a bolt that broke just siting there... what do you contribute the breakage to?

Over tightening, creep and internal stresses in the screw. With the screw being torqued the head has a constant tension load on it, add to the that the internal stresses the screw has in it from its hardening cycle and they are a ticking time bomb.

We had a lab project on material creep in engineering materials class in college. We would put a load on glass plates, wait 2 mins then add more weight, wait 2 mins then add weight, etc. until the glass broke. It always broke after it had been under the load for several seconds. At a molecular level, the material is always moving and when the crystallin structure alligns in a weaker manner it will break. Did the same thing with hardened bolts. Torqued them into a hardened plate (threads well lubed to prevent galling) and waited. With the bolt stretched near the end of its elastic region and just before it was in the plastic region its a ticking time bomb.

So most likely you have seen it happen before and didn't realize it. This same phenomenon is why hardened materials and vibrations don't mix well. Vibrations cause fluctuations in loads and when the crystallin structure alligns in a weaker patrern, hardened materials crack/break. Next time someone brings in a cylinder head off an old tractor for you to drill a bolt out that just happens to have the head popped off on its own without any help, tell the farmer you know what caused it. ;\)

By not over torquing the screw we don't put the screw near its "snapping" point and it can flex under the load without breaking.
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