Thread locking for hinge

[thlum]

I am working on a hinge that uses a #8-32 stainless steel screw and a tapped block of anodized 6061 aluminum (which acts as the nut). I am trying to maximize the frictional torque (rotational resistance) of the hinge. I've been using Loctite's 7649 primer (because both the stainless steel and anodized aluminum are inactive surfaces) and 268 threadlocker. I torque the screw to about 18 in-lbs-- anything higher and I start to cam out the 5/64" hex drive of the screw. However, after I exceed the breakaway torque (move the hinge for the first time) the remaining torque is too low, resulting in insufficient rotational resistance of the hinge.

Any suggestions on how to maximize this prevailing resistance of the hinge, other than increasing the initial insertion torque of the screw (would require a new screw with larger drive type)? Is there much better threadlocker for this kind of application?

 

[MadMango]

Instead of a thread locking compound, can you clamp your hinge halves against an acetal or nylon washer, or use a ball detent to create your hinge resistance? Perhaps a torque bar?

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of these Forums?

 

[chicopee]

If I read your problem correctly, about driving a pin between hinge and anodized block to resist rotation.