KrashDH
Top Post Dawg
You don't just add lube to add lube, it's all application specific. I don't specify for lube in a precision clean room operation, so dry torques are calculated. Lube is NOT the driving factor achieves the correct clamping force. The correct clamping force is achieved by calculating the correct torque based on what you want in the system it's being used in. Dry bolt, wet bolt, material properties etc. This torque is calculated by the load the system needs to withstand....the requirement"Bolts are simply assembled dry because cost"
That's my point. Your veering off on applications that qualify as the specialty application I keep mentioning, even though you admittedly use some form of lube as well. There is a reason for this and it comes down to achieving the proper clamping force while maintaining the integrity of the fastener and not going beyond it's intended yield. Those last two are often seen with dry fasteners, particularly when assembled/disassembled often.
It certainly does if the torque is supposed to be applied dry.I also very much disagree with your assessment that lube causes a false torque. If a lubed fastener requires less torque to achieve a specified clamping force than a dry fastener, where is the extra energy being applied in the case of the dry fastener?
Example...dry torque is supposed to be 75 ft-lbf
If you lube this bolt and apply 75 ft-lbf with your torque wrench, in reality, this bolt will be torqued to somewhere in the 100 ft-lbf vicinity.
I agree with thisMost standards assume a "dry torque" and therefore calculations are required for some (not all) lubes. This in no way defines dry assembly as being preferable, or better for the longevity of the fastener. Lube prevents galling and corrosion that dry fasteners are subjected too. One just must know and understand the effect the lube has on the final torque as I've noted above.
We're probably trying to say the same thing here.