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  1. 26th January 2014, 05:28 PM #46
    Retromilling
    Retromilling is offline Senior Member
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    Default

    Quote Originally Posted by Combustor View Post
    Interested to hear that a Jacobs taper will let go. May depend how it's fitted. Recently put one, 3MT, into a mount for a 80mm rock coring drill. Put the taper arbor in the freezer overnight and poured a jug of boiling water over the female arbor. Just bumped it in firmly and the guy is coring rock with it on a No 5MT radial drill. Will let you know if it ever slips, Combustor.
    A 3 MT has way more area than a short jacobs taper so fitted the way you do it I can understand how much more grip it would have .
    My chuck has only let go once when using a large drill and just getting it too hot and not peck drilling enough .
    I don't want it so tight I can't get it off easy so I compromise .
    If I fitted it with a press it would hold way better but I don't want to risk distorting the body of the expensive chuck .
    I only use large drills infrequently .
    The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
  2. 26th January 2014 05:28 PM # ADS
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  3. 18th February 2014, 12:47 AM #47
    Combustor
    Combustor is offline Senior Member
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    Default Cheap MT Drills, Update.

    Had a job for the 1" drill in my $50 Ozmestore drill set today. Had to bore thru the length of 4 pcs of steel each 4.5" long, steel was old excavator bucket pins, so a bit better than mild steel. Gave the cutting edges a light touch with a diamond stick before starting, as the original grind was a little rough, but angles were correct. Ran a 3/8" pilot hole thru the pieces before sinking the 1" bit in firmly, in a heavy lathe round 300 rpm. Used a bit of oil down the pilot hole to help chip flow, cutting quite cleanly. Bored all 4 pieces, total of 18" cut and drill edge was not visibly dulled. For my application and at $50 for the set I find that quite acceptable. No way to know if this is typical of the product or maybe I was lucky, so not complaining. Combustor.
    Old iron in the Outback, Kimberley WA.
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