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2 MT Milling Arbours

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Andrew Tinsley18/10/2017 16:47:09
1817 forum posts
2 photos

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.

David George 118/10/2017 17:07:26
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2110 forum posts
565 photos

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

David Standing 118/10/2017 17:28:41
1297 forum posts
50 photos

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).

Andrew Tinsley18/10/2017 17:46:03
1817 forum posts
2 photos

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

David Standing 118/10/2017 18:07:02
1297 forum posts
50 photos

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).

Roderick Jenkins18/10/2017 19:55:31
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2376 forum posts
800 photos

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

not done it yet18/10/2017 20:34:21
7517 forum posts
20 photos

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.

David Standing 118/10/2017 20:50:10
1297 forum posts
50 photos

Andrew

You could maybe adapt one of these:

**LINK**

Dave Halford19/10/2017 19:25:10
2536 forum posts
24 photos

Hi Andrew,

you have a PM

Andrew Tinsley20/10/2017 17:56:00
1817 forum posts
2 photos

Thank you all gents, as always, first class help.

Andrew.

Howard Lewis20/10/2017 18:04:27
7227 forum posts
21 photos

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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