Carbon fibre seat posts - how are they made?

Discussion in 'Bicycle Mechanics and Repairs' started by 02GF74, 12 Apr 2010.

  1. 02GF74

    02GF74 Über Member

    as per title, how are they made? In particular how do they make the surface so neat?

    Is the carbon wrapped round some former then put into a 2 part tube, vacuum formed? then polished?

    ... nad once that has been answered, what about carbon fibre bars?
  2. Globalti

    Globalti Legendary Member

    Been asking myself the same question. From this website: it looks as if the carbon fibre is wrapped around a mandrel, which is removed from inside after the resin has been added and cured. On the machining page you can find the explanation that the wrapping tape leaves the outside of the tube textured so this can be machined off. I guess a protective lacquer is then applied.

    Look at this:

    I also found some stuff about complex shapes being internally moulded, forced into the mould by an expanding bladder.
  3. Coco

    Coco Well-Known Member

    Slightly different use, but same principle:

    Tube making guide

    So if you want to make your own...
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