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Thread: So I now have a mini mill.

  1. #121
    Should Get Out More Big Pete's Avatar
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    Default Re: So I now have a mini mill.

    what kind of steel are you cutting?


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  3. #122
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Cheap unmarked. They call is silver steel but I've seen other stuff called the same thing. It was a cheap ebay special block, 1" square by 2' long for a tenner. It's tough as nails though. Blunts my Tian coated drills really quickly, luckily they are less than quid each Cutting oil helps the drills. Not using coolant on the mill as I heard you either flood carbide or do nothing. I may have heard that hear.

    I need to get a power feed so I can do proper feed rates.

    EDIT: Look in my last post, the clamps are made from it. Looks like any kind of steel to me

  4. #123
    Should Get Out More Big Pete's Avatar
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    Default Re: So I now have a mini mill.

    OK, that's a low alloy steel or a high carbon one minimum, so I reckon you're running pretty fast with no coolant, try about 1/4 - 1/3 the revs, and 1.5 -2 X the feed. with a low feed rate you are rubbing more than cutting which generates heat that can't be taken away by the cuttings. Heat is death to cutting tools. The numbers above are based on my dormer milling cutter book btw. If you have an air supply, blowing air on the cutter may help, but it's not as good as proper coolant, which also a lubricant and removes swarf.

  5. #124
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Ok. To Ben honest
    I was just running at whatever speed made the mill happy. Thanks.

  6. #125
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Finished a set of t nuts today, they fit better than the ones I bought. Also modified the band saw with a threaded hole
    To put clamps onto for smaller bits. One of my carbide end mills is chipped, tried higher feed slower RPM and the mill hated it.

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  8. #126
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    Default Re: So I now have a mini mill.

    In what way did it hate it?

  9. #127
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Vibrated like it was about to achieve orgasm.

  10. #128
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    Default Re: So I now have a mini mill.

    OK, sounds like a lack of stiffness, back the feed off, try keeping the speed where it was

  11. #129
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    Default Re: So I now have a mini mill.

    My mill is the same , i try to remember to lock all the slides apart from the one
    i am using and i use lower speeds than those generally quoted in books.

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