AXSR Action screws

[tna9001]

Hello All,

How are you torquing the #2 action screw? It looks to me that you'd have to use a ball end bit but, wouldn't that make the torque required to meet the spec higher?

Saying it another way, do ball end hex bits apply the same force to the screw for a given torque setting on the wrench as a regular bit?

Thanks for the replies!

 

[Trigger Monkey]

Looking at the whole page of the manual, it recommends using a 5/32" ball end wrench for fastener #2 so I'd think if A.I. is putting it in their manual, they've determined it to be safe, just don't use a junky bit. I use an extended 3/16" ball end bit from Fix It Sticks to torque the action screws on my AX AICS chassis to 65 in/lbs and have never had any issues.

 

[tna9001]

Looking at the whole page of the manual, it recommends using a 5/32" ball end wrench for fastener #2 so I'd think if A.I. is putting it in their manual, they've determined it to be safe, just don't use a junky bit. I use an extended 3/16" ball end bit from Fix It Sticks to torque the action screws on my AX AICS chassis to 65 in/lbs and have never had any issues.

View attachment 8531908

I saw that, it’s just counter intuitive, not that my intuition means anything. It just seems from a mechanical standpoint that the applied torque would be different between a bit at an angle versus straight on.

 

[Trigger Monkey]

You're overthinking it.

 

[tna9001]

You're overthinking it.

On a forum where people choose scopes based on ounces and worry about few fps muzzle velocity? A better name for this forum is OCD Central .

 

[Vivacious Stallion]

In this case AI has told you directly how to do it. As triggermonkey said, don't over think it.

That being said, I don't love needing to use a ball end hex for that screw.

 

[M8541Reaper]

The fix it sticks bits are trash. Limiters are great but their bits are trash. Replaced all of mine with either Milwaukee, Wiha, and Wera.

But fuck that bolt placement lol. Truth be told, I started to strip the bolt using the FiS extended ball but and should (aka need to) replace the bolt.

That said, just get a good ball bit and torque it to spec.


—-unrealated—-

Anyone have the AXSR action bolt spec?

 

[tna9001]

About the overthinking. I talked to two engineers I know, one structural and the other aeronautical. They both said the same thing (as I understood). Using a ball head driver will result in a decrease in torque for a given torque input to the driver because the torque is being applied off axis from the fastener, the greater the angle off axis, the greater the discrepancy.

So, the action screws on the AXSR are supposed to be torqued to 49 in-lb, if you set your torque wrench to 49 in-lb and use a ball head driver and the driver is off axis relative to the fastener then the fastener will be tightened to a value less than 49 in-lb. They also said that there isn't a standardized correction factor. My AXSR shoots just fine with that one fastener being set to an unknown torque setting, it just seems odd that a company like AI would create a design where a deterministic variable like a specific torque setting is now just another variable with no definition.

 

[somasteve]

Sorry to necro this thread but on page 49 of the AXSR user manual it says to torque the action screws to 53 in-lbs and the chart on page 10 says to torque the actions crews to 49 in-lbs. So there are two different torque recommendations on two different pages within the official AXSR user manual. Clearly the copy-editor needed to take another pass and no one at Accuracy International has decided to fix this despite the AXSR being available to the public for nearly a decade now.

Also, anyone know why they moved to 5/32 with the AXSR when the AX was 4mm and the AT-XC is 4mm?

 

[918v]

I don’t think it matters whether you torque the screws to 49 or 53 inch pounds, or anywhere in between. Torque wrenches aren’t that precise and thread condition will affect the torque more.