- Joined
- Oct 22, 2014
- Messages
- 10,119
The rings were good, still are.
The problem was over torquing. You used the dry torque rating, on a wet torque application.
The difference is the added lubrication really increases the force on the screw at the same torque. Without reducing the torque for a lubricated screw, you could easily hit the yield strength of the screw, or create a problem like you have.
The screws are junk now btw.
No one said Loctite is Oil. What was pointed out was, Dry screws and Wet screws have different torque ratings, due to the "Wet" has some lubrication qualities and he friction is reduced as a result. Meaning there is more force on the screw with the same torque.Locktite is not oil. I am doubtful that even oil would meaningfully alter the K value enough to have a meaning effect on torque.
It is typically a 25-30% reduction for a Wet torque.I've seen a lot of mixed feedback on whether this is actually true or fuddlore. Any sources for how much the loctite would increase the K value?
Check post #14No way loctite made any noticeable difference to cause that damage. Something else is going on.
Exactly what to you think you have contributed to the solution here?You obviously aren't a journeyman mechanic are you?
Blue loc-tite doesn't appreciably change the k-factor of fasteners.
Also, if you think that putting 18 inch-lbs of force on a 10-32 screw, even if it was covered in lubricating oil will come anywhere near the yield strength of the screw, you should probably do some research on yield strengths of various fasteners.
I'll happily argue this.You obviously aren't a journeyman mechanic are you?
Blue loc-tite doesn't appreciably change the k-factor of fasteners.
Also, if you think that putting 18 inch-lbs of force on a 10-32 screw, even if it was covered in lubricating oil will come anywhere near the yield strength of the screw, you should probably do some research on yield strengths of various fasteners.
I'll happily argue this.
Grab any edition of machinery handbook and find that there is in fact a difference in torque for wet vs dry and that everything has a coefficient of drag. The percentage reduction is directly related to pitch. A 48tpi IS going to stretch more than a 13tpi.
Now....let's talk metrology, you're not likely using a tool that has ever been calibrated and probably couldn't be anyhow. So you have a tool that's within 10ish percent and a fastener that could be out 30 plus percent.
Did anyone measure the screws before they were sent off? They will often hourglass when over torqued.
Wet vs dry depends on what the "wet" is. Affects are measurable. Loctite 242 changes K-factor by less than 10%.
First you assemble your scope like an amateur, now you sound like one.journeyman713
Sounds like you work for Warne to me....
I mostly believe this is the issue as well. There could be some squareness issues between the counterbore and the mate surface or the rings could be out of square. This is one time where alignment dowels before it was torn down would answer a lot....like who's at fault.Locktite wasn’t the problem. It was either tightened down asymmetrically or there is a lack of concentricity/misalignment or size issue.
That is why it is good to check ring alignment with alignment bars before mounting the scope and if needed lap… or if way off, ditch the rings/base.
You think the loctite turned his 15 in/lbs torque into more than the 25 in/lbs torque that Warne recommends (see picture Form posted)?2. You over tightened it.
First you assemble your scope like an amateur, now you sound like one.
This is your mistake, own it.
Your problem was clearly pointed out as 2 fold.
1. You assembled it wrong. Failure to make sure the split rings were evenly gapped before tightening.
2. You over tightened it.
Simply put, the thin walled scope tube got elongated because the forces were not evenly distributed, then you cranked it down too much.