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Chockstone Forum - Crag & Route Beta

Crag & Route Beta

Area	Location	Sub Location	Crag	Links
VIC Southwest	Werribee Gorge	(General)	(General)	[ Werribee Guide \| Images ]

Topic Date User

Unsafe bolts at the Falcons lookout 15-Oct-2015 At 11:49:51 PM Dave_S

Message

Some more information on the "poor man's torque wrench", which may be useful: Torque in Newton-meters (Nm) is calculated as a force multiplied by a distance. Appropriate force for a given torque can be found by dividing the torque by the distance. The force is how hard you are pulling on the spanner, and the distance is the perpendicular distance from the bolt to the point of the spanner that you're pulling on. Perpendicular means the shortest distance between the bolt and the line along which the force is applied. (See image below.) Multiply weight in Kg by 10 to get an approximate value for the force in Newtons that you are applying.

So if you were holding a spanner 20cm from the nut, and were aiming for a torque of 35Nm, then you'd want to apply a force equal to 35Nm/0.2m = 175N. Divide by 10 to convert N to Kg, and that tells you that you should be pulling on the spanner (perpendicularly) with the amount of force that would be needed to lift 17.5Kg.

Alternatively, Aldi currently seem to have torque wrenches in the 28-210Nm range on sale for $25.