1/16” spotting drills
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  1. #1
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    Default 1/16” spotting drills

    I have a couple of Albrecht 15 chucks, 1/16” max dia. that I use frequently, one on a sensitive drill adapter and one on a sensitive drilling machine. There are some times it would be nice to be able to spot before drilling. So far the smallest spotting drills I have been able to find are 2mm which are just a tad too large. The more common minimum size is 1/8” which is way too big. I can deal with this with the sensitive adapter, through musical chucks, not so with the little drilling machine. Does anyone know of a spotting drill that will fit an Albrecht 15-J0?

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    I believe that Harvey Tool has spotting drills down to 0.020". Also various geometries as well. Happy spending!

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    Quote Originally Posted by millwrong View Post
    I believe that Harvey Tool has spotting drills down to 0.020". Also various geometries as well. Happy spending!
    True, but the smallest shank diameter is .125----too large for an Albrecht 15 chuck.

    Denis

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    You could use an Albrecht 30 J0 chuck on a sensitive adapter. They are rated to close to .015 inch, about a 78 or 79 drill size. The 15 J0 chuck is rated to close to .008 inch. I have drill bits down to smaller than that, but they are pivot drills with oversize shanks. In fact, those pivot drills can be used for spotting.

    Mascot is an old USA brand of watch repair tools. My old Mascot drills are carbon steel. No idea where they are made now.
    .004 Inch to .050 Inch Mascot Flat Pivot Drills Sold Individually

    No surprise that the Swiss make tiny drills, but no worry about quality here:
    SPHINX(R) Drills: SPIREC Micro Drills - Penn Tool Co., Inc
    Pilot drill

    Larry

    flatbits-2.jpg

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    I could get an Albrecht 30, but the tariff is a bit painful when I already have the 15s. The Mascot drills look to be spot on. I’m going to pick up a few and give them a try. Thanks Larry.

    Cheers,

    —Michael

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    Have you looked at engraving tools? I prefer them over spot drills for anything under a 3/16” hole

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    Quote Originally Posted by Spruewell View Post
    Have you looked at engraving tools? I prefer them over spot drills for anything under a 3/16” hole
    Most engraving tools these days have 1/8" straight shanks, so no use in a 15 J0 chuck. I did notice that Sphinx has tiny engraving tools, but their spotting drills are probably better suited to spotting.

    Larry

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    Man, I hate to say this as I will probably get reamed, but if this is just for occasional use and it is really hard to find small shank suitable bits, I would probably just abrasive saw a .0625 so that just a 16th of flutes remained and then use an fine diamond file and sharpen it. Would take only a couple minutes with a good magnifier and a steady hand. I (and a good number of others on this forum I am sure) have sharpened much smaller bits in this fashion to good effect. I was forced to learn this on a weekend with a job I needed to ship on Monday and several dull #77 bits. It was far easier than I imagined and the hand sharpened bits cut very nicely.

    Denis

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    I wanted one so I simply made it from a broken, 1/16" bit. It only took minutes.

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    And I am planning on doing that as well, sometimes the most obvious answers are the hardest ones to find.

    Cheers,

    —Michael

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    Quote Originally Posted by mnl View Post
    And I am planning on doing that as well, sometimes the most obvious answers are the hardest ones to find.

    Cheers,

    —Michael
    https://www.mscdirect.com/product/details/61608543

    https://www.mscdirect.com/product/details/06825962 (probably don't want/need to order 10 of them though!)

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    I think this may have been covered by Larry in post #4 above, but if not...
    NC spotting drill

    -Marty-

    NB: I posted this a couple of days ago in the wrong thread. It is copied here now in the correct one. Sorry.

    -Marty-


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