Posted by Eric on November 28, 2001 at 14:26:11:
sorry about the several
recent posts, still a lot to learn...
How much should one torque the action
screws? Is there a standard range or is that trial and error (I am thinking
Anschutz 1813, with bedded receiver)?
thanks
Eric
Posted by Perry W. McFarland on November 28, 2001 at 15:39:51:
Eric:
Most of the time they will shoot best when the action screws are torqued to
between 4 and 6 Newton Meters (35 to 55 Inch Pounds). You will need to
experiment with a number of torques within that range to find the best setting
for your rifle.
Perry
Posted by michelle on November 29, 2001 at 06:37:16:
be careful not to
over tighten the torque bolts like i did. it strips the thread inside the
receiver and really screws it up then.
michelle
Posted by michelle on November 29, 2001 at 09:52:16:
I’d say 6.5 nm max,
that’s about 0.75 under what mine went at
Posted by Perry W. McFarland on November 30, 2001 at 11:39:23:
Michelle:
I assume that the action screws were not cross-threaded...
If the
threads in your Anschutz action stripped when you torqued your action screws to
6.5 Newton Meters, then it sounds like there was something wrong with the
metallurgy of your action, or that the threads on the action screws did not
match the threads in the action. Did you have a gunsmith perform a hardness test
on the action to see if it is within specification?
Perry
Posted by Ken Johnson on November 30, 2001 at 15:05:05:
So you want to
know about torquing action screws, eh?
I did some work on this (empirically
and otherwise) and have come up with a hypothesis that has yet to be disproved.
Please let me know if you do disprove it. This should be an interesting one for
debate.
Back to the golden days of physics, dynamics and statics. I took a
2013 barrel off the action and weighed it. I likewise found the balance point.
From this I found that the barrel weighed so many pounds. I found the balance
point to be X distance from the front action screw. Multiplying the two together
gave me a foot*pound rating. I torques my action screws (all of them) to this
amount. By the way, guess what the number turned out to be? 42 in*lbs.
Translates to 5 N*M metric, exactly what Anschutz recommends.
Now, the proof
was in the pudding. I took the rifle with this specific torque to the recoil
machine rest and tested it. Sure enough, the groups were tightest with this
torque.
What's more, I've weighed center fire barrels as well, found their
balance point, torque accordingly, and found nothing but excellent groups.
You see, torque represents a force (on the actions screw). There is a
twisting force on the action as a result of the barrel hanging off it. There
must be a counteracting force on the action to keep the whole thing "static".
That's where the force from the bedding screws come in.
Now, am I right?
Hell if I know. I might be well in left field. Does it work? Yes. I choose to
say no more.
Ken Johnson
Posted by Andy Wai on December 01, 2001 at 10:18:23:
In that case,
shouldn't 2013, 2013/690 and 2007/660 all have different torque settings? Also,
aluminum stocks have higher factory recommended setting, 6.5Nm vs 5Nm. doesn’t
quite work out the way you described above. May still be right though, I don't
know.
Andy Wai
Posted by Eric on December 01, 2001 at 15:29:05:
but what about glass and
pillar bedded actions ? what torque should one use for those ?
thanks Eric
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