Torque

[FionaZuppa]

And, in the auto trade, lug nut torque is different when a lube like Never-Seez is used.

well, sure, maybe, myth perhaps.

i beat the balls off my 4x4 in AZ desert, often, 33's on 16" alloys. other than installing extended wheel studs and using hollow nuts (the studs stick out end of nut), i use OEM torq with a crap load of anti-seize. never once since 2006 (because its a 2006 truck) did i ever have a lug come loose, never had a warped rotor, nothing.

if it was happening elsewhere (maybe in 1986) then perhaps some other engineering barf was the issue?

but ok, whatever you folks think is good, i'll go with what you say

 

[Besoeker]

Do any of you guys use Belleville disk spring washers for electrical joints?
We used them on buss bar connections. They can be stacked if you need more tension.
And some pressure mounted semiconductor clamps use them.


https://www.google.co.uk/search?q=t...hXSYVAKHeRCC-wQ9QEINzAB#imgrc=y1z7P-Pj-ugoaM:

 

[jumper]

Do any of you guys use Belleville disk spring washers for electrical joints?
We used them on buss bar connections. They can be stacked if you need more tension.
And some pressure mounted semiconductor clamps use them.


https://www.google.co.uk/search?q=t...hXSYVAKHeRCC-wQ9QEINzAB#imgrc=y1z7P-Pj-ugoaM:

Yes. They are very common here.

 

[Besoeker]

Yes. They are very common here.

When you use them, do you still need to torque up the joints?

 

[ActionDave]

Do any of you guys use Belleville disk spring washers for electrical joints?

Yes, but only on jobs where they are required.

When you use them, do you still need to torque up the joints?

Sometimes.

 

[GoldDigger]

Do any of you guys use Belleville disk spring washers for electrical joints?
We used them on buss bar connections. They can be stacked if you need more tension.
And some pressure mounted semiconductor clamps use them.

Stacking the washers back to back does not do anything to increase tension. (Does putting batteries in parallel increase the voltage?)
What it does is allow more motion (differential expansion, loosening of threads, etc.) before you lose a significant amount of tension in the fastener.
Stacking them spooned does increase the tension, but in an unreliable way. Better to use thicker washers with a known higher tension rating.

 

[Besoeker]

Stacking the washers back to back does not do anything to increase tension.

From Wikipedia:

As said, multiple Belleville washers may be stacked to modify the spring constant (or spring rate) or the amount of deflection.

 

[GoldDigger]

From Wikipedia:

Right. To increase spring rate you "spoon" them. To increase travel you set them back to back. I was just pointing out that there were two possibilities, only one of which you mentioned.

Sent from my XT1585 using Tapatalk

 

[Besoeker]

Right. To increase spring rate you "spoon" them. To increase travel you set them back to back.

But, the further it travels the more force is needed.

 

[GoldDigger]

But, the further it travels the more force is needed.

But with back to back washers the increase in tension with increased travel never gets any higher than with a single washer at full displacement.

 

[gar]

171021-1715 EDT

A definition of "spring rate":
https://www.eatondetroitspring.com/spring-rate-vs-load-rate/

Quite obviously if you want to apply tension in a screw type fastener by rotation of one of the thread elements, then you need to "torque it up". No matter how soft the joint is, and you want some force across the joint, then you need to torque the screw elements to produce the desired force.

What a Belleville washer does is soften the entire joint combination. Thus, the effect of temperature or other mechanical variations does not much change the force on the actual joint or the fastener tension.

.

 

[Besoeker]

But with back to back washers the increase in tension with increased travel never gets any higher than with a single washer at full displacement.

Point noted.........