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Small MT2 Tailstock Chuck for ML7

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Dr_GMJN27/01/2022 13:22:32
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1266 forum posts

All, the smallest tailstock chuck I have for the ML7 is still fairly large and heavy. Although it closes to pretty much nothing, I sometimes have to put a pin chuck in it for very small drills. Obviously this increases overhang, reducing accuracy and stiffness just when I need it.

Can anyone recommend a very small Jacobs type chuck with an MT2 taper? Preferably keyless, but anything considered so long as it’s accurate and securely closes to about 0.25mm diameter minimum.

Thanks.

Martin Connelly27/01/2022 13:30:52
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Get a pin chuck and mount it in the standard chuck. Do not tighten the main chuck down enough to stop it from moving. You can restrain the pin chuck with your fingers for these small drills and move the pin chuck into the workpiece by hand giving a good feel for the cutting action. You may need to add a collar to the pin chuck for drills that are bigger than your Ø0.25mm ones. 

Martin C

Edited By Martin Connelly on 27/01/2022 13:32:07

Michael Gilligan27/01/2022 13:52:48
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20057 forum posts
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The obvious [but perhaps costly] choice would, I think, be something like a watchmaker’s tailstock spindle mounted to slide within a Morse Taper blank.

MichaelG.

.

Edit: __ for inspiration only … unless you have very deep pockets :

https://www.cousinsuk.com/product/lathe-drilling-tailstock

 

Edited By Michael Gilligan on 27/01/2022 13:59:53

Frances IoM27/01/2022 14:00:37
1247 forum posts
28 photos
there was a posting beginning of January re stuff at Lidl - one mentioned included a small vice, small drills and a hand held pin chuck - none of items is 1st class tho but the pin chuck may be salvageable as it uses the same thread as the old Minicraft drills which had better chucks and for which you could buy a MT2 arbour with soft head from say ARC and screw cut the thread on it - dremel made a much better tiny chuck that could be purchased as a separate item but used a different thread - I've made arbours for both for use in my Perris lathe (MT0) - tracy tools used to sell small Rohm chucks on MT2 arbours.

Edited By Frances IoM on 27/01/2022 14:01:30

JasonB27/01/2022 14:21:42
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I've use one of ARCs little sensitive holders and a chuck to do 0.3mm hole so should be OK for your 0.25mm ones too.

Regularly use their "heavy duty" ones for 0.8mm holes too.

Edited By JasonB on 27/01/2022 14:22:02

speelwerk27/01/2022 14:27:22
439 forum posts
2 photos

I use a Rhom supra 0 - 4 mm B10, top one in the supra list, Niko.

**LINK**

Edited By speelwerk on 27/01/2022 14:29:10

Martin King 227/01/2022 15:19:58
980 forum posts
436 photos

+1 for the Arc sensitive chuck that Jason shows, use mine all the time and it has a nice ‘feel’

Martin

Dave Wootton27/01/2022 16:19:36
290 forum posts
65 photos

Another +1 for the Arc sensitive chuck, find it invaluable and seem not to have broken so many tiny drills since purchase! Previously used an Arrand one that fitted on the tailstock dieholder set, not such a sensitive feel as the Arc for really small drills.

Just done a few oil jets for sight glasses at No 78 drill with no casualties.

Dave

Edited By Dave Wootton on 27/01/2022 16:21:51

Roderick Jenkins27/01/2022 17:44:01
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2176 forum posts
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Bear in mind that the chuck and arbor are sold separately. So, for example, Arceurotrade's two smallest chucks (keyed and keyless) can both be married to 2MT arbors.

Rod

IanT27/01/2022 17:52:56
1984 forum posts
211 photos

Arc sell a range of MT2 tapers with various tapers on the nose - and the chucks to match them.

I also purchased a 'sensitive' drill but frankly felt that the drill shaft was far too loose in it's body - so I remade it as mentioned a week or so back. However, I think it's worth pointing out that you don't really need this kind of drill holder (with knurled bearing) as when used in the tailstock, it doesn't need to revolve.

You could use any small chuck and just make a sliding shaft into an MT2 blank arbor.

The knurled bearing is required if you use it in a drill or mill - as then the body does spin. This 'sensitive' type of chuck & holder is also useful if you have a small horzontal mill with a vertical head that has no 'quill' (so drilling has to be done by raising/lowering the table). My re-built version has a reduced 10mm shaft end, so it can fit in an ER16 collet and be used on my Taig milling head.

Regards,

IanT

Modifoed drilling attachment

Sensitive drill in Taig head

 

Edited By IanT on 27/01/2022 17:56:28

Henry Brown27/01/2022 18:03:11
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548 forum posts
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There's a chap on facebook in Coventry called Dave Adkins who sells used tools etc. he usually has lots of that sort of stuff. I've had a 3MT chuck and various bits and bobs from him and he's usually pretty reasonable price wise.

Nicholas Farr27/01/2022 19:53:56
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3310 forum posts
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Hi, I also have one of those from Arc, the chuck is 0.3mm - 4mm, but it won't hold onto a a piece of 0.26mm wire, but they are a good piece of kit.

Regards Nick.

JasonB27/01/2022 19:58:08
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The chuck will hold PCB type drills with their larger shanks without problem.

old mart27/01/2022 21:37:38
3717 forum posts
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We have a couple of pristine Jacobs small chucks, one 5/16" and the other 1/4", I believe they are JT1 tapers. One has a MT2 and the other is on an R8. The 1/4" will hold a no80 drill easily, and probably smaller and the body is much shorter than the common 1/2" chucks.

Edited By old mart on 27/01/2022 21:40:31

Dr_GMJN27/01/2022 23:30:36
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1266 forum posts

Thanks all.

So the Arc chuck and collar is fixed into a larger chuck in the tailstock, and can be extended and retracted by the collar? And if fitted into a mill or pillar drill, the chuck rotates but the collar stays loose, and can still be extended and retracted?

Sounds spot-on, but ideally I’d like to fit it direct into the MT2 taper to get it as short as possible. Can the straight shank easily be replaced with a taper? Then I’d have both options?

thinking about it, I think I may have a small chuck on an MT2 in a box I got with the lathe. Might dig it out, but it looked dead IIRC, and obviously wouldn’t be ‘sensitive’ (which seems like a good idea).

JasonB28/01/2022 07:19:19
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Yes you have the operation right.

Has the Myford got a through hole so you could use a MT2 x 1/2" collet

David George 128/01/2022 08:16:19
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I have a small Jacobs chuck it is a medium duty up to 4mm size. It has an 0 JT taper mount and I have the 0JT to 1/2 " stem mount. It can be used in a collet on the mill or in the chuck on the lathe but I believe you can get a Morse 1 to 0 JT arbour it runns very true within a couple of thou at worst. I have made a mount for my Stuart lathe for the same chuck to suit the tailstock.

20170730_162511.jpg

David

Dr_GMJN28/01/2022 08:25:44
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1266 forum posts
Posted by JasonB on 28/01/2022 07:19:19:

Yes you have the operation right.

Has the Myford got a through hole so you could use a MT2 x 1/2" collet

Yes, the tailstock MT2 taper is hollow if that’s what you mean? Presumably I’d need a draw bar then? Thanks.

Dr_GMJN28/01/2022 08:26:59
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1266 forum posts
Posted by David George 1 on 28/01/2022 08:16:19:

I have a small Jacobs chuck it is a medium duty up to 4mm size. It has an 0 JT taper mount and I have the 0JT to 1/2 " stem mount. It can be used in a collet on the mill or in the chuck on the lathe but I believe you can get a Morse 1 to 0 JT arbour it runns very true within a couple of thou at worst. I have made a mount for my Stuart lathe for the same chuck to suit the tailstock.

20170730_162511.jpg

David


Thanks David. That’s similar to the one I think I’ve got in a box, only MT2. I’ll dig it out today.

Michael Gilligan28/01/2022 09:37:18
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Posted by Dr_GMJN on 28/01/2022 08:25:44:
Posted by JasonB on 28/01/2022 07:19:19:

[…]

Has the Myford got a through hole […]

Yes, the tailstock MT2 taper is hollow if that’s what you mean? […]

.

Hence my [presumably inappropriate] suggestion, yesterday.


MichaelG.

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