kevin
New Member
Posts: 15 
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Post by kevin on Jul 20, 2018 9:05:06 GMT -5
Hi there,
I just bought a second hand duo doweller. The 10mm diameter bits that came with it are around 67mm long and protrude out through the base... It was only when I got back to the workshop and had a proper look at it that I realised the base didn't slide forward any further. After a bit of googling I see that the stadard bits are 58mm long. I don't mind too much buying a new set of bits for it cos I got it at a fair price, but I'm perplexed as to why someone would buy long bits for this in the first place?? Surely it's unusable as it is?
Am I missing something??
Thanks in advance, Kevin
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Post by aas on Jul 20, 2018 15:17:04 GMT -5
Seems odd... would work with a 9mm MDF shim - but why?.. maybe the reason you got it cheap, he couldn't work it out either!
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kevin
New Member
Posts: 15
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Post by kevin on Jul 21, 2018 3:45:35 GMT -5
Yeah it's a bit odd isn't it? And to confuse matters further I've come across these 67mm bits that are available specifically for the DD 40... www.fine-tools.com/duebelbohrer.htmlThe guy I bought them off was closing down his workshop and selling everything off. He actually had two DD 40s and I got the second one. Maybe the first buyer took all the proper bits...? It's not a big deal as I can get the CMT bits locally, I'm more curious as to why there are long bits in the first place |
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Post by erik on Jul 21, 2018 10:28:16 GMT -5
Well it makes more sense if he had two units that way he could max out with the regular bits and then get a bit of extra reach with the other unit without changing bits.
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Post by aas on Jul 23, 2018 0:42:29 GMT -5
It doesn't make sense in any scenario... the DD40 would have to be stopped, the bits lined up with the holes and pushed in, then started up and plunged - all for an extra 9mm of dowel?.. and I'm not too sure what the last 9mm of dowel would add in strength to the joint!
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kevin
New Member
Posts: 15
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Post by kevin on Jul 24, 2018 4:47:56 GMT -5
It doesn't make sense in any scenario... the DD40 would have to be stopped, the bits lined up with the holes and pushed in, then started up and plunged - all for an extra 9mm of dowel?.. and I'm not too sure what the last 9mm of dowel would add in strength to the joint! Yeah it's a bit of a head scratcher...
Forking out for a second DD40 for the sake of an extra 9mm seems excessive but maybe that was it he had his reasons..??
Not to worry, ordering standard sized bits today so I can get working
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Post by aas on Jul 24, 2018 13:47:46 GMT -5
Enjoy, it's a great tool!
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Post by holmz on Jul 25, 2018 3:29:08 GMT -5
Maybe the pervious owner had a case of bit envy?
(sometimes it is better to just know how to use the tool properly...)
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Post by jimbouk on Jul 29, 2018 13:35:47 GMT -5
If you are dowelling a rebated or lapped joint but indexing on the higher section longer bits would be useful.....who knows. Great tool, enjoy.
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Post by matchesder on Oct 23, 2018 15:00:30 GMT -5
Yeah it's a bit odd isn't it? And to confuse matters further I've come across these 67mm bits that are available specifically for the DD 40... www.fine-tools.com/duebelbohrer.htmlThe guy I bought them off was closing down his workshop and selling everything off. He actually had two DD 40s and I got the second one. Maybe the first buyer took all the proper bits...? It's not a big deal as I can get the CMT bits locally, I'm more curious as to why there are long bits in the first place Regarding the CMT bits you might want to read my post in the "dowel drills" thread.
With the CMT ones I bought, you have less usable length for sizes 8 mm and below. Your linked website says the klein ones are for the Duo Dowel system. But nit specifically for the DD40. Maybe other dowelers use different length of bits. Have you asked the pre owner why he put the long bits in? Maybe it yust is a mistake. Or really for use in cincunction with some kind of jig. Anyways... have fun with your new tool  Martin |
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Post by henrun on Nov 27, 2018 14:56:13 GMT -5
I can see a use when dowelling rebated joints together. The normal plunge depth would be insufficient as the machine would register against the outermost part of the rebate. Other than that? Dunno.
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