Hello Talk Composites,

Hi, the problem with "roll wrapped" round a mandrel is that the OD can vary quite a bit +/- 0.5mm (or more) and is not perfectly round/ concentric. This is not an issue for many applications. In your case I think there would be an issue getting a nice fit between the two tubes. In the past I have used a thicker wall tube and then machined the OD to size.(only a short 40mm at the ends) Not ideal as you then start introducing "changes of section" into the tube which is not good for "high load areas". (plus extra weight of course) I now use a "split" mould with an internal bladder. This gives me an accurate OD and the ability to add extra layers of reinforcement at the ends of the tubes (where the inserts go) without affecting the OD.