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Thread: I hate 2mm drill bits!

  1. 07-06-2011, 10:01 AM #1
    Black Forest
    Black Forest is offline Senior Member
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    Default I hate 2mm drill bits!

    I have a bunch of 2mm holes I have/had to drill for the pedals for the sheep shearing machine.

    Everything goes good and then bang. I bought 10 German made 2mm bits. Drill bit breaks off in workpiece. I was pecking and flooding with coolant. A big pain in the butt.

    Either I learn to drill small diameter holes correctly or I buy a EDM!
    Basic Physics: Two particles of matter cannot occupy the same space at the same time!
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  2. 07-06-2011, 10:08 AM #2
    lakeside53
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    Why are they breaking? Is your RPM high enough? What's the material?

    If your using colbalt, at that size it's easier to break them. Try HSS.
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  3. 07-06-2011, 12:26 PM #3
    Black_Moons
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    Insure a center/spot hole drilled first.

    I learned that even with the best mill, a drill without a center/spot hole will wander, and then that slight wander can snap the drill (or drill a hole at an angle)
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  4. 07-06-2011, 12:32 PM #4
    Ryobiguy
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    Also double check that they're chucked up concentric to the spindle rotation. I have one drill chuck that works great for larger diameters. But smaller diameters tend to wobble just a little and make it too easy to break the drill.

    -Matt
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  5. 07-06-2011, 01:03 PM #5
    macona
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    If you are using split point bits you dont need to spot. Check your speed, good chance you are going way slow.
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  6. 07-06-2011, 01:14 PM #6
    Black Forest
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    I was at 2250 rpm. That is as high as I can go. They were HSS. I center punched but did not center drill. Tomorrow I will try a center drill first.
    Basic Physics: Two particles of matter cannot occupy the same space at the same time!
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  7. 07-06-2011, 01:19 PM #7
    Black Forest
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    I was thinking about some of the posts Brian made in his hit n miss engine build. No way I will ever build one of those small engines. Too many small holes!
    Basic Physics: Two particles of matter cannot occupy the same space at the same time!
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  8. 07-06-2011, 02:02 PM #8
    HAP
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    Speed way too slow...
    Who do I think you are...?
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  9. 07-06-2011, 02:52 PM #9
    aboard_epsilon
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    how about these ..bit more support.. less bend..less break hopefully

    http://cgi.ebay.co.uk/5-x-Pcs-MICRO-...item1e61a995b1

    all the best.markj
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  10. 07-06-2011, 03:18 PM #10
    MrSleepy Guest

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    Quote Originally Posted by aboard_epsilon
    how about these ..bit more support.. less bend..less break hopefully

    http://cgi.ebay.co.uk/5-x-Pcs-MICRO-...item1e61a995b1

    all the best.markj
    I think they may be a lot worse....I use those type frequently....and any axial play leads to a break..they are very brittle..

    Great for PCBs ..if you have a ridgid high speed drill. My Pollard spins at 20000 rpm when using that type of bit.

    Rob
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