David, many joints have the washer next to the bolt head or nut face. I agree that some companies place a plain washer and then a split helical washer next to the bolt head or nut face. Such assemblies will also come loose when tested on a Junker machine. It should be realized that this type of washer does not cause loosening, but if the conditions for loosening arise, loosening will not be prevented. Secondly, if an existing joint contains this type of washer and the joint is performing satisfactorily, then there is a risk if they are removed. The hardened washer can provide a good surface for a reliable torque-tension relationship. Their removal can result in the fastener friction increasing which would decrease the preload and increase the risk of the friction grip of the joint being overcome. How to stop self-loosening; you need to make sure that the bolts are selected and tightened sufficiently so that transverse joint movement is prevented. Such movement is usually the root cause of the loosening. If for whatever reason such movement can't be ensured, then a locking approach of proven ability should be used, such as a wedge-lock washer, etc. A warning however, if repeated transverse joint movement occurs, you are likely to end up in the longer term with the bolts failing due to bending fatigue.
You have to take into account the vibration that you’re going to be experiencing in your washer application! I have no idea what the test is that was being performed here? But my hunch is that it was an extremely high intensity vibration that loosened that lock washer. For most applications, a lock washer I should say for most home-based applications like putting a workbench together or tightening up a screw on a lawnmower bolt on a lawnmower or even a tractor honestly!but if you get into industrial applications, you need to use something other than a lock washer! It depends upon the use.
My understanding is the washer shown in the video is called a split washer. My understanding is a spring washer, or a Belleville spring washer is a cup shaped or conical shaped washer and has a spring-like flexibility which allows it to grip tighter than split and tooth lock washers. The arched shape of these washers presses up against a bolt to prevent loosening from wear, vibration, or temperature changes. Similar to a spring, they flatten out as pressure is applied, helping to absorb vibration. They grip bolts more tightly than split and tooth lock washers. Unlike split lock washers, which can only hold tight in one direction, these washers have a continuous body that can rotate in either direction while holding tight.
@@DigvijayEngineers use nuts and bolts with serrated washer heads or the washer featured in this video. Or use red or blue thread locker depending on desired anti-turn or ease of removal.
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David, many joints have the washer next to the bolt head or nut face. I agree that some companies place a plain washer and then a split helical washer next to the bolt head or nut face. Such assemblies will also come loose when tested on a Junker machine. It should be realized that this type of washer does not cause loosening, but if the conditions for loosening arise, loosening will not be prevented. Secondly, if an existing joint contains this type of washer and the joint is performing satisfactorily, then there is a risk if they are removed. The hardened washer can provide a good surface for a reliable torque-tension relationship. Their removal can result in the fastener friction increasing which would decrease the preload and increase the risk of the friction grip of the joint being overcome.
How to stop self-loosening; you need to make sure that the bolts are selected and tightened sufficiently so that transverse joint movement is prevented. Such movement is usually the root cause of the loosening.
If for whatever reason such movement can't be ensured, then a locking approach of proven ability should be used, such as a wedge-lock washer, etc. A warning however, if repeated transverse joint movement occurs, you are likely to end up in the longer term with the bolts failing due to bending fatigue.
You have to take into account the vibration that you’re going to be experiencing in your washer application! I have no idea what the test is that was being performed here? But my hunch is that it was an extremely high intensity vibration that loosened that lock washer. For most applications, a lock washer I should say for most home-based applications like putting a workbench together or tightening up a screw on a lawnmower bolt on a lawnmower or even a tractor honestly!but if you get into industrial applications, you need to use something other than a lock washer! It depends upon the use.
My understanding is the washer shown in the video is called a split washer. My understanding is a spring washer, or a Belleville spring washer is a cup shaped or conical shaped washer and has a spring-like flexibility which allows it to grip tighter than split and tooth lock washers. The arched shape of these washers presses up against a bolt to prevent loosening from wear, vibration, or temperature changes. Similar to a spring, they flatten out as pressure is applied, helping to absorb vibration. They grip bolts more tightly than split and tooth lock washers. Unlike split lock washers, which can only hold tight in one direction, these washers have a continuous body that can rotate in either direction while holding tight.
Results would be better when used with plain washer?
Does Increasing the spring constant works to prevent rotation?
Thanks. I and the designers in my department realized this years ago and yet they continued to specify these useless things out of habit. Sigh
Aren't they designed to be used only once or something?
But it is still working. We just have to develop it.
Gret video folks!
It's supposed to be on the nut end, no?
Fixing the nut will still allow the bolt to turn. The video clearly shows that the bolt will turn.
Junker testing machine ? I want the specification and make. Plz revert.
then what to do
Why? The bolt will be even more free to turn. It's clear from the video that bolts turn.
@@lxoxrxexnx sir then which washer should be used in this situation
@@DigvijayEngineers use nuts and bolts with serrated washer heads or the washer featured in this video. Or use red or blue thread locker depending on desired anti-turn or ease of removal.
Fix it with nut not bolt
Same thing will happen. Split washers are a left over from poor engineers