0.30 > K > 0.10 – The bending process is of normal difficulty: using only an internal, fixed bending mandrel will be sufficient.K > 0.30 – Bending the tube is more ‘straightforward’ and there is now need to use special support jigs that would need to be manufactured ad hoc.The difficulty of the tube bend is inversely proportional to its value: the difficulty increases with a low K-factor and decreases with a high K-factor. This formula produces the value for the K-factor.
