1. #1
    Do any of you have experience milling carbon fibre pultrusions? I'm thinking about this 10mm box section, and would like to do some mitres and bits. I know it is very stiff, but is it also very hard? Any tips I might need to know? What does it compare to for difficultly in milling; plastics, aluminium, steel?


  2. #2
    John S's Avatar
    Lives in Nottingham, England, United Kingdom. Last Activity: 8 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,946. Received thanks 126 times, giving thanks to others 44 times. Referred 1 members to the community.
    It's immensely abrasive, shags cutters up like no tomorrow, carbide included.
    I think the pro's use diamond coated tooling for it.
    John S -

  3. #3
    Quote Originally Posted by John S View Post
    I think the pro's use diamond coated tooling for it.
    Does that make me a pro

    I've cut carbon fibre sheet lots of times. By far the best cutter I found is those cylindrical diamond coated cutters you find in rotary tool kits:


    Here's a video of one of these cutting:

    [Ok can't find that, will post when I have]


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    It's a bit slow (300mm/min @24000rpm if I recall correctly), but the cutters last a long time and since it's effectively a grinding process the finish is excellent.

  4. #4
    A chap who does alot with this stuff told me it kills electric spindles very quickly? The 'dust' being very effective at destroying electrical bits....? Anyone had experience of this?

  5. #5
    What sort of spindle is there other than electric? Steam?

  6. #6
    Quote Originally Posted by Tenson View Post
    What sort of spindle is there other than electric? Steam?
    hehe, I should have said air cooled VS water cooled :)

    The chap thought water cooled would have been much less effected..

  7. #7
    Ahh I see. He probably has a good point, I'll try to avoid letting the dust get about. I'll be using a water-cooled spindle anyway.

  8. Good night:

    To cut carbon fiber with a perfect finish, watch the video.
    Spindle speed 9250 rpm ...
    Feed Rate ..... 920 mm / m
    Rate Plunge ..... 550 mm / m
    Two blade .... End Mill 3 mm

    Carbon Fiber .... Thickness .... 1.5 mm


    Good Works.
    António Pinho


  9. #9
    Did you find the end-mill became blunt quickly? Was it an uncoated endmill?

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