Shade tree metrics to professional metrics
Professional level has liabilities tied into the picture...AKA insurance
On my production lines and the process lines I've automated...anyone
caught not using a torque wrench (that has been checked weekly and
certified to be accurate) to the specified torque for 'that' fastener...
WOULD BE FIRED ON THE SPOT
and an audit & testing
of all the stuff that person assembled on that shift and earlier
shifts if something was found on the first test
Issues abound from not tight enough to too much. Not may understand that
'too much' part...weakens the fastener
Another way to look at this is to ask why is there both a "safety chain"
and "break away lanyard"...
Anyone know how a fastener works?
It is
CLAMPING FORCE
squeezing two or more parts
together. With some shear and on that, not a good design if the fasteners
are mainly for shear...a hardened shear tube or boss or counter sink, etc
is the proper way to go (not best, but proper...and hope folks understand
that difference)
The fastener size and numbers of them are calculated to provide the
clamping force required...PLUS some safety factor (design margin)
Even the grade of the fasteners are chosen and not many know that there
are some times a sequencing of failure to that...meaning you want
one part to let go before another and that one part will have the
lower grade fasteners...
Recommend following the OEM's torque and grade specifications
