1. #1

    I am trying to drill 500 off 2.395mm dia holes in an ali casting but the drill I am using keeps building up with swarf on the drill flutes after just one hole has been drilled.

    I am using a special sphinx drill for this job but would like some help with why the drill is building up with swarf.

    I am using a horizontal milling machine to do this job and I have tried the following speeds and feeds

    S10000 F600
    S10000 F400
    S6000 F300

    I am using G83 peck cycle with pecks on 3.5mm and the hole is 10mm thru.

    I have also tried using thru spindle coolant and still no luck.

    Any help would be appreciated.

  2. #2
    Have you tried blowing air at it with a decent pressure while drilling ?

  3. #3
    Have you tried wd40? Apparently it's the bees knees for cutting aluminum.

  4. #4
    Is the feedrate within spec for the particular drill you're using?

    So far you've tried-

    Looking at a basic polished cobalt drill (you are using polished drills?), the recommended feedrate should be about 0.1mm/rev, while a solid carbide is slightly higher depending on the alloy, and high-helix drills being higher yet at around 0.15mm/rev.

  5. #5
    Hi Woolley
    You really need a suitable coolant,and that would be parrafin.
    Last edited by mekanik; 04-09-2013 at 08:13 AM.

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