Boxford 11-30 spindle reducing bush

[Scottmk1Participant @scottmk1]

[Scottmk1Participant @scottmk1]

Hi folks, I have a Boxford 11-30 lathe and would like to get a reducing bush for the spindle, and Boxford want a small fortune for it.

The spec is No.4.5 ASA.B5.10 bush (machined down, internally, to a No. 3 Morse taper) as taken from the lathes.co.uk website. Does anyone know where I can get one or can anyone the actual dimensions of the bush I need?

Scott

[John HewesParticipant @johnhewes50816]

Hi Scott. Did you get this sorted out, I have an AUD and the same problem?

Seasons Greetings

John

[JasonBModerator @jasonb]

Home & workshop usually have a selection of reducers for various lathes, worth giving them a try.

J

[SaxalbyParticipant @saxalby]

John,

If you mean the (for the AUD) the 3MT to 3C collet nose adapter, then I can let you have a photo and dimensions. I made one for friends Boxford. Not a difficult job.

Regards Barry

[John HewesParticipant @johnhewes50816]

Thanks Barry, that would be great.

I have not used collets before so please excuse my ignorance on the subject, I assume that with the adaptor I can then buy MT3 collects of the size to suit my end mills, but do I also need a drawbar, or a nose cap to tighten the collet?

John

[JasonBModerator @jasonb]

I think the 11-30 has a different spindle to the AUD as its a bigger lathe so you would still need the converter to get down to MT3.

Once down to MT3 you can use more easily obtainable (and cheaper) MT3 collets with a drawbar or better still get a 5C or ER32/40 chuck which does not need drawbar and you can tighten the 5C ones with a chuck key rather than spanners

Personally I would not go for 3C on your lathe as you will be limiting what size bar can pass through the spindle by using such small collets. I think the largest you can get into a 3C is 0.5" but the 5C will pass 1.125"

 

J

Edited By JasonB on 03/01/2014 11:14:51

[SaxalbyParticipant @saxalby]

I assumed, perhaps wrongly, that John had the 3C collets but the nose piece had gone missing. I agree that the 3C are limited to 1/2 inch. I bought my 3C with the lathe when new, but later bought a Bison 5C collet chuck, which takes collets up to 1 1/8 inch. Much more useful, and the cost of 3C are no cheaper than 5C.

I still use the 3C a lot as it is quicker to spin the drawbar than the key on the 5C chuck, and have a set of BA hex collets for it.

If anyone still wants the sizes for the 3C nose piece, just let me know.

[John McNamaraParticipant @johnmcnamara74883]

Hi Scottmk1

You could make your own, I made a couple of reducing bushes a while back. One MT3 and one int40 to match my mill.
Here is the link. **LINK**.

Regards
John

 

Edited By John McNamara on 03/01/2014 14:42:32

[SteveIParticipant @stevei]

Hi,

 

In the book of words I have for my IS11.30 I have a copy of a drawing for the "5C – 4 1/2 Taper Collet Adaptor. P/N X10 / 19 / 003. It details:

 

"No 4 1/2 Taper (ASA. B5. 10-1960). 1 deg 29' 22" ON RAD. (0.624" TAPER PER FOOT ON DIA.) Note inside of spindle nose is a Morse Taper of 4 1/2. "

 

 

Although this is not quite what you want perhaps it may help; I can scan it in at work on Monday and send it to you. PM me if your interested.

I have one of these adapters. Although I have no means (known to me) to accurately measure the taper. Although self evidently the internal taper is 3 morse the details of which are easy to search for on the internet.

EDIT: I have found a document titled "MT  4 and a half to 5c adapter.pdf" in the files section of the yahoo boxford group. It is not quite the same document.  You can download it or I can email it to you if you PM me your address.

Steve

Edited By SteveI on 03/01/2014 17:59:18

[John HewesParticipant @johnhewes50816]

Hello again and thanks to all those who have tried to help me.

I am really a beginner and my kit looks very small and old and tatty compared to the photos you guys have posted.

At the moment all I am trying to do is to hold a 1/2" end mill in the headstock. Could I use the collet and tightening cap from my Elu wood router, if I make the matching adaptor for the headstock bore? Would it need to be hardened on the bore?

From a mature student

John

[JasonBModerator @jasonb]

The Elu collets are really very similar to ER collets so I don't see why not, for occasional use you could get away with leaving it soft. Do you also have 1/4 and 3/8 Elu collets as you are likely to want to hold more than just 1/2" shank cutters, if not then may be better to buy an ER nut and a few ER collets as the ERs are cheaper than Elu/DeWalt and you can just add to them as required.

J

[SteveIParticipant @stevei]

John,

You have stated a requirement to hold an end mill in the head stock. This poses the question of how you are holding down the workpiece? These later type of boxfords do not have T slotted cross slides. Although Boxford can supply a Milling / Boring table for them. However this is approximately 10x the price of the spindle reducing bush which is more than the lathes go for on ebay. Unless you got lucky and had one with your lathe or you plan on making one.

Steve

[John HewesParticipant @johnhewes50816]

Hi Steve, I got lucky!

i have had the lathe for about 10 years and have long wanted to try milling on it. I kept a look out on ebay and managed to get a Boxford lathe with the T slotted cross slide, so did a swop, tidied up the "new" lathe and sold it at a profit!

John

[SteveIParticipant @stevei]

John,

Any chance for a picture of that set-up?

Steve

[Tony RayParticipant @tonyray65007]

Steve,

If I were you I would go for an ER 40 backplate mounted chuck taking advantage of the spindle bore. You will need a d1-3 backplate and fit the chuck to it but that's a far simpler prospect than making a 5c or other adapter. The only downside is the collets require a fair bit of closing torque.

Tony

[John HewesParticipant @johnhewes50816]

Steve, here are a couple of pics.

The fixing holes on the vert. slide did not match the T slots, so I have drilled and tapped the slide to fix one of the vert slide holes.

John

[SteveIParticipant @stevei]

All,

My apologies to all. I have mistaken this thread to be about the later type Boxford lathes. e.g. the IS11.30, TR11.30, 280 etc. It was not. The pictures clarified that immediately. So pretty much everything I wrote was not applicable. Sorry.

Tony, regarding the D1-3 mount ER40, that is indeed a sound idea. its on the list. I picked up a D1-3 backplate recently.

Steve

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