2 MT Milling Arbours

This topic has 11 replies, 7 voices, and was last updated 20 October 2017 at 18:04 by Howard Lewis.

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18 October 2017 at 16:47 #322131
Andrew Tinsley
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@andrewtinsley63637
I shall need to make or purchase some 2MT milling arbours. So a few questions.

I presume that they should be one piece construction, so what type of steel should I use?

I don't much like turning MT2 tapers. I always takes me ages to get the exact taper. So any tips would be welcome.

I am very tempted to buy commercial tapers and somehow graft on the shaft. It might be difficult to get the items concentric and then how would one do the joining? Probably extremely bad practice and to be avoided. But if you don't ask, then one may be missing a trick.

I assume that horizontal (and vertical) milling arbours can be purchased. One can always turn the overarm support diameter on the end. Is it cost effective to buy commercial items, considering the usual hassle that I have with turning Morse tapers accurately and the cost of raw material?

Andrew.
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18 October 2017 at 16:47 #18705
Andrew Tinsley
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@andrewtinsley63637
18 October 2017 at 17:07 #322134
David George 1
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@davidgeorge1
Hi Andrew I have made horizontal arbours in the past but I made them from EN 32B and case hardened and then ground them on a cylindrical grinder so no problem with geting taper and shaft true. What machine are they for and how long would they be and diameter are they.

David
18 October 2017 at 17:28 #322137
David Standing 1
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@davidstanding1
Andrew

I have done some research on the subject, as I want to fabricate a spare arbour for my Tom Senior M1 so I can use 1/2" bore cutters.

As David says above, what exactly do you need?

Stub arbours are available, if you want something longer you may be able to adapt a 2MT test bar, which are normally about 330mm long in total.

There was also a thread in the last few days – I will see if I can remember which one – where someone mentioned that one of the suppliers had horizontal arbours in stock – can't recall who it was, I think it was RDG (and they aren't on their website).
18 October 2017 at 17:46 #322139
Andrew Tinsley
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@andrewtinsley63637
Hello Both,

I want the arbours for a Centec 2B so very much like the ones for a Tom Senior, for size. I would guess about 8 inches long, excluding the taper. I wold like to use the common metric bores applicable to a small mill. Hope that helps.

Andrew.

Edited By Andrew Tinsley on 18/10/2017 17:46:58
18 October 2017 at 18:07 #322141
David Standing 1
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@davidstanding1
Andrew

After much head scratching I have found the reference I was looking for, it was on the Yahoo groups Tom Senior page.

By coincidence I have a Centec 2 and a TS M1 sitting in my workshop………

The parallel part of the arbour on the Centec I have is only around 6" long, the TS is 14.5" excluding the drive dog.

The TS taper is 3MT on early ones, 30 INT on later ones.

So, TS arbours are way bigger than Centec (and is, funnily enough, exactly why I have just upgraded to the TS).
18 October 2017 at 19:55 #322167
Roderick Jenkins
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@roderickjenkins93242
I'd be very tempted to make composite arbors from a commercial 2MT blank end and a length of silver steel or PGMS Loctited (is that a word?) together. I did a vaguely similar exercise with the rollers for my GHT bender. The overlap was about 3/4". You can always pin as well if you feel you need more security.

Rod
18 October 2017 at 20:34 #322178
not done it yet
Participant
@notdoneityet
I made a 22mm arbor for my Centec. A bought-in 2MT blank and shrink fitted the two pieces together. Not fallen apart yet. I considered cross drilling and pinning as well. Time will tell, but all is well at the moment.
18 October 2017 at 20:50 #322181
David Standing 1
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@davidstanding1
Andrew

You could maybe adapt one of these:

**LINK**
19 October 2017 at 19:25 #322325
Dave Halford
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@davehalford22513
Hi Andrew,

you have a PM
20 October 2017 at 17:56 #322536
Andrew Tinsley
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@andrewtinsley63637
Thank you all gents, as always, first class help.

Andrew.
20 October 2017 at 18:04 #322540
Howard Lewis
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@howardlewis46836
Since I doubt my ability to make a good job of turning a Morse taper, have always bought commercial stub arbors, and like Roderick, grafted on extensions, secured with anaerobic sealant; without any obvious problems.

My bet is that a ground, commercial, item would be better finished than anything that I could turn.

Even converted a long arbor, for a horizontal mill, from 30 INT to 3 MT, in case I ever wanted to use it in the lathe for any reason.

Thats my two pence.

Howard
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