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IndustryArena Forum > Events, Product Announcements Etc > News Announcements > Advice/Looking for Info on Micro/Jewerly End Mills
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  1. #1
    Join Date
    Jun 2018
    Posts
    1

    Advice/Looking for Info on Micro/Jewerly End Mills

    Hi all, first-time poster.

    I've been learning by myself with my Universities Bantam Tools CNC Machine, mostly milling PCBs in FR-1 (Copper and Fiber Glass). I've been wanting to use smaller ICs on my PCBs, so I bought some 0.2 and 0.3mm Flat End Mills from China that I knew weren't going to be great given their price, but wanted to just experiment. These smaller bits broke immediately on the FR-1 I was trying to mill, so before I destroyed all ten wanted to know if anyone had knowledge, documentation, etc on using these types of smaller "jewellry" end-mills.

    More than anything I want to know if my speeds and feeds sound right. I've never had to calculate them myself, and can't find any suggested speeds for such small end-mills. For the 0.3mm 8-Flute End-Mill I'm using the following auto generated values:
    Feed rate: 144.00 mm/min
    Plunge Rate: 12.00mm/min
    Spindle Speed: 12000rpm
    Stepover: 15.00%

    I'm going to fathom a guess I should just spend the extra money for end-mills with fewer flutes (like 2), as it makes for a very lengthy bit that seems too fragile.

    Thanks for the help.

  2. #2
    Join Date
    Dec 2013
    Posts
    5717

    Re: Advice/Looking for Info on Micro/Jewerly End Mills

    Try slowing down your feed, a lot. The work up from there
    Jim Dawson
    Sandy, Oregon, USA

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