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Milling Chucks

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The Merry Miller05/01/2011 17:24:07
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Can anybody out there cast an unbiased (or biased) opinion about the above.
 
NJH05/01/2011 17:55:56
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Hi
 
I've had one of these for some years and it's fine. Mine is No. 3 MT with imperial collets ( I have since obtained metric collets too) and it came in  a wooden box otherwise it looks identical to the one advertised. Chronos are an OK firm.
 
Regards
 
Norman 
peter walton05/01/2011 17:56:51
82 forum posts
seems to be a good deal on their normal prices.
Not to sure about the quality though, a bit of pot luck!!
 
Peter
JasonB05/01/2011 18:06:04
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Also consider an ER collet as its more versatile, I've not had a cutter come out of mine.
 
J
Steve Garnett05/01/2011 18:41:25
837 forum posts
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I acquired one of these recently, MT2, also in a box, second-hand but unused (hey, it was cheap). Although I haven't used it yet either, it appears to be pretty well made, as Norman says. Mine has both metric and imperial collets, but also, it's definitely a Vertex one. On Chronos' site they list the set shown in the above link and the Vertex versions separately, even though they look identical. So, are they really?
The Merry Miller05/01/2011 19:39:38
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Jason mentions the ER collets.
 
I have  a complete set of Myford ER25 imperial collets (genuine ones) but I would be reluctant to use milling cutters in them because of the lack of a drawbar feature.
JasonB05/01/2011 20:15:03
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The vast majority of commercial tooling seems to come with plain shanks and they don't seem to have problems holding the tooling which is probably pushed far harder than a hobbiest would
 
Just take a look at someone like J&L I would say 97% of their milling cutters are unthreaded mostly plain shank. Even the Weldon type shanks, the flat will only resist turning and large amounts of pull out.
 
If you wanted to use solid carbidecutters, indexable endmills, spot drills etc you would need an ER type chuck so I personally can't see a need for both.
 
Jason

Edited By JasonB on 05/01/2011 20:15:53

The Merry Miller05/01/2011 20:32:03
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Point taken Jason.
Steve Garnett05/01/2011 22:48:21
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I'm sure Jason's right. My original plan was to purchase a set of ER collets - I use this style at work on a middle-size mill, and I've never had any trouble with them slipping at all. And at some stage I almost certainly will purchase some; it's just that the Posilock MT2 set was a real bargain...
 
Surely if you have a set of Myford ER25s, then all you need to use them for milling is a suitable adaptor with a drawbar? Like Arc Euro Trade's 050-110-25530 ER25/MT2 Milling Collet Chuck which can take an M10 one? And only half the price!
Versaboss05/01/2011 23:23:39
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Or get one from here, Merry Miller! :

http://www.ctctools.biz/servlet/the-25/ER16-MT2-MK2-COLLET/Detail

and the collets also...

No vested interest, just a satisfied customer here. At the moment the 3rd order from me is under way. You can't beat these prices...

Greetings, Hansrudolf


Steve Garnett05/01/2011 23:41:50
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Yes, Handsrudolf, they are cheap! Just hope that the UK import duty and postage doesn't knock the cost up too much - and I think that the Merry Miller will need The ER25 one rather than the ER16...
The Merry Miller06/01/2011 10:06:42
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There is a big difference between the Myford ER25 collet and the Arc Euro ER25 version.
The Myford one is about twice as long as the Arc Euro  and no way will it fit into the Arc Euro chuck.
I thought there was a standard for the ER25 system, perhaps I am wrong. It looks like it's just the head fitting which is the same, what goes on behind the head  it is anybody's business.
Versaboss06/01/2011 11:05:13
431 forum posts
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Steve, I don't know which is the limit for import taxes in GB, but the gents at CTC know their business! On my last order they cut away all the prices in the accompanying paperwork, and on the customs declaration about half of the effective value was stated... no import taxes for amounts around 50 $ here! But maybe I should not tell that the whole world...

The insured air freight was between 22 and 27 $. When I think that the cheapest insert holders here cost about 3-4 times the CTC price, thenI am still saving. A collet here costs usually around 30$, against  3.25 (ER 25). The quality is as good as the domestic ones, imho.


Merry Miller, what is this Myford collet??? A ER25 is a ER25 is a ER25 (hmm, kind of citation, but I can't remember from whom )

Certainly there are no 'double length' ER collets; it must be another type.

Greetings, Hansrudolf



The Merry Miller06/01/2011 11:26:23
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Shown above is image from another website where the author is making his own Myford collets. (finished one on the left).
As I said earlier, the head (or nose) of the collet is ER25, what is behind it is pure MT2.
 
http://www.haythornthwaite.com/Collet%20Myford.htm  is the link to the author's website.
 

The Merry Miller06/01/2011 11:37:26
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Below is a description form the Myford spares website.
 
They do ER40 as well as ER25.
 
Myford Patent 2 MT Collets for fitting directly into the spindle of all ML10, Speed 10, Diamond 10, ML7, ML7-R and Super 7 lathes, with spindle nose bored 2 MT and threaded 1⅛” x 12 TPI Whitworth. The collets may also be used with the big bore Super 7 Plus and Connoisseur lathes in conjunction with 15353 Headstock Reduction/Step Down Adaptor.

The main advantage of the Myford 2 MT Collet, which is located and closed by means of a nose piece, is that the collet features a through bore. Most other 2 MT collets have blind bore because the collets are closed by means of a draw bar. The Myford collet permits longer lengths of material to be passed through the collet where it is supported in the spindle against whirling and allows the part to be machined and positioned nearer to the spindle nose leading to greater              accuracy.
Imperial Collets are available in individual sizes from 1/16” to ½” in 64th increments (32 in a full set).
Metric Collets are available in individual sizes from 2mm to 13mm in 0.5mm increments (23 collets in a full set).

Chris Crosskey06/01/2011 13:07:29
15 forum posts
Myford collets have nothing to do with ER.... if the nose is the same size I would suggest it is coincidental.... It's a Morse Taper collet that uses a nose closer rather than a drawbar.
 
I've got a full set of Myford collets in Imperial 32nds and metric wholes, with some 0.5mm, 64ths and an odd hex but I'd recoil from using them for milling unless I had to.... I've got some drawbar MT2 collets to fit 6mm and 1/4" as it is useful for FC3's but for the bigger stuff I use Clarkson  Autolock as I've been able to get a small fitting chuck to fit both my Myford and my Herbert Simplimill (for when it's rebuilt) as well as a bigger chuck for the Herbert....
 
chrisc
The Merry Miller06/01/2011 13:47:15
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484 forum posts
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It's weird that Myford still refer to their collets as ER.
 
Anyway we're back to my earlier post  and almost full circle now.
 
I'm with you Chris on this one.
I will not use my Myford collets for milling and will look again at the Posilock chuck and even the MT2  drawbar collets that Arc Euro sell.
 
Chris, would you use those for 1/2" cutters?
KWIL06/01/2011 14:04:05
3144 forum posts
57 photos
Myford refer to ER collets correctly where they are indeed offering ER series colletts together with adaptors which fit the Myford "standard nose" on both the normal and larger bore lathes.
 
To my knowledge Myford have never referred to their 2MT press in colletts as ER.
 
I would not try to hold a milling cutter above 1/4" dia with any hope of it staying still even when I had to use the Myford as a mill.

Edited By KWIL on 06/01/2011 14:05:00

The Merry Miller06/01/2011 14:24:33
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"The ER system is the only popular toolholding system in which all components (chuck, collets and clamping nut) are standardised by DIN 6499.

ER systems are truly interchangeable. All manufacturers of this system should conform to the DIN 6499 standard. This becomes important to users that may have toolholding systems from different toolholding system manufacturers.

As tools are taken out of the tool crib and reassembled for different jobs, if all the ER system components are in good condition, and are from quality toolholding system manufacturers, the collet and tool should achieve the DIN 6499 accuracy."
 
Well there we have it!!
 
Update your website Myford  and call them something different, any suggestions?
 
I still don't know what ER signifies, Ever Ready, perhaps!
NJH06/01/2011 15:03:00
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2314 forum posts
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I think the confusion may be due to the arrangement on the Myford web page.
In the " Lathe Accessories" - section 4 " Collets" it shows the ER40 nose adapter followed by the ER40 collets. After this, but on the next page, is the ER25 nose adapter. The rest of the section on that page refers to the " Myford patent No. 2 MT  collets " and the nose adapter, closing tube etc.  So I suspect this is where the confusion is occuring.
 As far as standardisation goes all  ER 25 collets are 35mm long, have a maximum diameter of 26mm and taper of 8 degrees. (Although you probably don't want to know that!)
 
Cheers
 
Norman
 
 

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