Sweep failure

 From:  medi (MALD)
Hi Michael.

At the moment I am modelling a Sherman tank in MOI. As part of the modelling I tried to model a protective pipe guard for part of the tank by sweeping a circular profile along a single curved rail. Unfortunately, the result is unsatisfactory. Sometimes a pipe is formed along only a quarter of the curve; at other times the whole pipe appears to be formed but sections of it will shoot off at a tangent to the curve. Have enclosed a test file. Any thoughts would be appreciated.