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  1. #1
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    Default Morse Taper or 12.7mm Shank for 29mm drill bit?

    I have ordered a Beall tap specific for my Tecknatool lathe spindle, which is 1¼" x 8 TPI.

    Beall_Tap.jpg

    I don't have the right size drill for doing the pre-tapped hole, so I am on the market for one. The size I wish to purchase is 29mm and they are quite cheap from Chinese sources. As the bit will get nominal use and be used exclusively in timber, I am not concerned about the steel or longevity factor.

    What does interest me is whether I should pick one with a reduced shank, or one with a MT2 shank, which would go directly into my tail stock?

    Thoughts?

    Mick.

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  3. #2
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    Jan 2014
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    Default

    I believe MT2 shank drills finish at 23mm. After that it’s MT3. Probably need to get a reduced shank.

  4. #3
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    Townsville. Tropical Nth Qld.
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    Default

    Or buy a single forstner bit.
    Rgds,
    Crocy

  5. #4
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    Default

    Quote Originally Posted by Old Croc View Post
    Or buy a single forstner bit.
    Rgds,
    Crocy
    If you don't have, or can't find, a 29mm Forstner bit, use 1 1/8 Imperial - recommended hole size for 1 1/4 - 8.

    Cheers,
    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain

  6. #5
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    Default

    Quote Originally Posted by Lappa View Post
    I believe MT2 shank drills finish at 23mm. After that it’s MT3. Probably need to get a reduced shank.

    You are correct, I didn't know they went up a size from then on.

    Mick.

  7. #6
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    Quote Originally Posted by joe greiner View Post
    If you don't have, or can't find, a 29mm Forstner bit, use 1 1/8 Imperial - recommended hole size for 1 1/4 - 8.

    Cheers,
    Joe
    That is an option, but at this stage I'm trying to get a 29mm bit. Apart from drill bits for rivets, I don't have any non metric drill bits; not in a screaming hurry to start adding non metric stuff at this stage of my life.

    I grew up with feet and inches, a much younger brother grew up with metric. I use metric, he uses inches; crazy world eh?

    Mick.

  8. #7
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    Default

    Yes I know, the tapping die I have just bought is in inches.

    Mick.

  9. #8
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    Apr 2017
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    Default

    I have a box of old bowling ball bits in the shed, all MT2 and up to 1 1/4. I'll have a look tomorrow and see if there is a spare 1 1/8. If there is one it will be carbide tipped and probably blunt.
    Cheers, Robbie.

  10. #9
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    Quote Originally Posted by RobbieB View Post
    I have a box of old bowling ball bits in the shed, all MT2 and up to 1 1/4. I'll have a look tomorrow and see if there is a spare 1 1/8. If there is one it will be carbide tipped and probably blunt.
    Cheers, Robbie.
    Hmm, bowling ball bits, never would have thought of them. Does that mean we all have imperial digits?

    Perhaps they are use imperial sized holes for 10 pin bowling balls as the originator of 10 pin bowling is the European 9 pin bowling; they don't have holes in their balls.

    Kegelbahn is probably the most popular in Germany, I've played it in quite a few places in Germany; far more interesting than 10 pin bowling. It is played outside, inside, in special bowling lanes mostly underground in pubs and clubs, or even in backyards. Skittles is probably a more correct translation and applies equally to 10 pin bowling.

    I will consider your offer, but as previously mentioned, I am quite averse to non metric stuff.

    Mick.

  11. #10
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    Quote Originally Posted by Optimark View Post
    That is an option, but at this stage I'm trying to get a 29mm bit. Apart from drill bits for rivets, I don't have any non metric drill bits; not in a screaming hurry to start adding non metric stuff at this stage of my life.
    Does a 29 mm bit even exist other than as a special order?

    do you want a forstner, saw tooth forstner, brad point, speed bore, auger (machine or hand), or ???

    if a speed bore would work for you, you could always get a 30 mm bit and grind 0.5 mm off each side.
    regards from Alberta, Canada

    ian

  12. #11
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    29mm bits are readily available but mostly with MT3 shanks.

    https://www.machineryhouse.com.au/D333
    Last edited by Lappa; 13th December 2017 at 05:58 PM. Reason: link

  13. #12
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    Perth
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    You can still use a 29 mm MT3 bit but you will need to get an MT3 female / MT2 male adapter/extension to use it in an MT2 socket.

    The drill will cost about $60 for a cheap one here in Aus.
    Mcjing has the extension sleeve for $42

    If you want a quality chinese bit then CTC tools in HK have 29mm drill bits for $27 but they want $20 for shipping
    An Ebay seller in Victoria has them for around $40.

  14. #13
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    that's starting to look an expensive way to side step purchasing an 1-1/8" bit


    BTW, are the suggested MT twist bits really suitable for drilling wood?
    regards from Alberta, Canada

    ian

  15. #14
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    Quote Originally Posted by ian View Post
    that's starting to look an expensive way to side step purchasing an 1-1/8" bit
    BTW, are the suggested MT twist bits really suitable for drilling wood?
    They cut wood just fine, but if you want a clean edged hole you might need to use a sacrificial piece of wood on top.

  16. #15
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    Oct 2004
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    Melbourne, Australia.
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    Default

    Well a plethora of information, many thanks to all who have replied.

    In general I am now leaning towards a 29mm reduced shank bit. One of the things all of now can experience, is world wide shopping; it is simply unbelievable what is now on offer.

    For Ian, in the past I have used a system for drilling timber with conventional HSS metal drill bits using some sacrificial timber to keep things clean; I will keep doing this as it does work. Previously drilled and tapped timber to M30 x 3.5 very successfully.

    Unfortunately my lathe uses a different size to what the majority of lathes in Australia now have. I wonder why Australia has adopted that smaller size (M30 x 3.5) when pretty much the rest of the world uses M33 x 3.5 or 1¼" x 8.

    I'll let you know what I eventually get.

    Mick.

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