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10th December 2017, 07:51 PM #1GOLD MEMBER
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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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10th December 2017 07:51 PM # ADSGoogle Adsense Advertisement
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10th December 2017, 09:00 PM #2Woodworking mechanic
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I believe MT2 shank drills finish at 23mm. After that it’s MT3. Probably need to get a reduced shank.
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10th December 2017, 09:19 PM #3GOLD MEMBER
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Or buy a single forstner bit.
Rgds,
Crocy
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11th December 2017, 04:30 PM #4
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11th December 2017, 04:35 PM #5GOLD MEMBER
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11th December 2017, 04:52 PM #6GOLD MEMBER
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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.
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11th December 2017, 04:53 PM #7GOLD MEMBER
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Yes I know, the tapping die I have just bought is in inches.
Mick.
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11th December 2017, 08:32 PM #8Intermediate Member
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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.
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12th December 2017, 07:42 AM #9GOLD MEMBER
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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.
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13th December 2017, 05:01 PM #10regards from Alberta, Canada
ian
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13th December 2017, 05:45 PM #11Woodworking mechanic
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29mm bits are readily available but mostly with MT3 shanks.
https://www.machineryhouse.com.au/D333Last edited by Lappa; 13th December 2017 at 05:58 PM. Reason: link
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13th December 2017, 05:52 PM #12.
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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.
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13th December 2017, 06:26 PM #13
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
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13th December 2017, 06:45 PM #14.
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14th December 2017, 10:32 AM #15GOLD MEMBER
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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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