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  1. #1
    So I need to machine some aluminium parts that have a number of undercut retaining lugs - pretty small maybe 2mm high undercut by 0.5...0.7mm. I think I can sort the Gcode by getting the CAM to make the overall path and frigging the in and out paths by manual editing. BUT I need an appropriate cutter - a bit like what you'd use for making T-slots but much smaller - anyone got any ideas please?

    BTW, the simple manual approach using a file isn't possible since these lugs are down inside a cavity :-(

  2. Slotting disc will do the job if it will fit inside the cavity. Various ways to do the code but easy way is to treat it like an end mill following a profile path with a DOC to suit slot disc and use Diamater offset for the under cut depth.

  3. #3

  4. #4
    Quote Originally Posted by JAZZCNC View Post
    Slotting disc will do the job if it will fit inside the cavity. Various ways to do the code but easy way is to treat it like an end mill following a profile path with a DOC to suit slot disc and use Diamater offset for the under cut depth.
    Thanks for the idea. I seem to remember seeing some small slitting saws and an arbor in father's watchmaking gear when I cleared the house - I'll go have a root and see what I can find.

  5. #5
    Quote Originally Posted by johngoodrich View Post
    They look good too, if I can't find the saw bits I might order one up - shame they're mostly imperial sizes though!

  6. #6
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 12 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,437. Received thanks 279 times, giving thanks to others 7 times.
    If you're limited for space, then these indexable cutters go down to 10mm diameter - https://www.cutwel.co.uk/milling-too...mmill-pxsxuxvx

    They are pricey, but I have the smallest size, and it's saved me from having to make fixtures to machine the opposite side a few times.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  7. #7
    Those are cool - just wondering whether the client will wear the cost though

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