Thread: Thermal problem

My thermal isn't adjusting correctly or holding zero. Usually they are pretty solid because there is no mechanical workings inside of them.

I took it off the rifle and used a torque wrench. It was easy to unscrew the mounts and they were just 20 ft lb. Im sure they were 30 ft lb when I mounted it. Although it felt solid do you think 20 ft lb would have allowed movement?

Thanks

20 seems low unless its a .22. but i dont think it would cause it to shift, i had a scope once i think it was a vortex crossfire or something else that had a spec of 18 inlbs and it held zero fine on a 223. i usually dont do less than 25.

It’s possible if the mounts are “ lower quality “ or poorly designed

30 - 35inch pounds has held a lot of scopes over the years.

Originally Posted by Tahr

My thermal isn't adjusting correctly or holding zero. Usually they are pretty solid because there is no mechanical workings inside of them.

I took it off the rifle and used a torque wrench. It was easy to unscrew the mounts and they were just 20 ft lb. Im sure they were 30 ft lb when I mounted it. Although it felt solid do you think 20 ft lb would have allowed movement?

Thanks

What your supplier say.

Originally Posted by Tahr

My thermal isn't adjusting correctly or holding zero. Usually they are pretty solid because there is no mechanical workings inside of them.

I took it off the rifle and used a torque wrench. It was easy to unscrew the mounts and they were just 20 ft lb. Im sure they were 30 ft lb when I mounted it. Although it felt solid do you think 20 ft lb would have allowed movement?

Thanks

What breed of thermal @Tahr I'm having a similar issue with a hicmicro atm

If it is significantly heavier than a normal scope, 20 ft lb might be a bit low.

The other test you can do is put a bit of rail in a vice, and mount the thermal on the rail. Then look through it preferably at things that are further away, while you check the adjustments and the tracking. This was how I diagnosed a NV scope that was playing up.

Originally Posted by longshot

If it is significantly heavier than a normal scope, 20 ft lb might be a bit low.

The other test you can do is put a bit of rail in a vice, and mount the thermal on the rail. Then look through it preferably at things that are further away, while you check the adjustments and the tracking. This was how I diagnosed a NV scope that was playing up.

He could do that with it still on rifle too.... Those black n decker workmate/ job mate benches are very handy for this sort of thing.

Scope base mounting should be in inch-lbs, not foot lbs, BIG difference.

Originally Posted by tetawa

Scope base mounting should be in inch-lbs, not foot lbs, BIG difference.

Yeah, my bad. Im using inch pounds. Thanks.