Kaiser Boring Head

[Simon Williams 3Participant @simonwilliams3]

What taper is this?

[Simon Williams 3Participant @simonwilliams3]

Good evening all!

Magpie that I am, I was unable to leave this on the shelf of a junk shop some while ago, and it's sat on a shelf in my (junk) shop ever since, gathering dust as you can see. I've never used it, but only because I've got nothing with a corresponding socket, and can't quite bring myself to modify it.

The threaded portion is M16 x 2.0, and the register just to its left is 17.94 dia. The minor dia of the taper is 19.24 and the major dia is 25.58 (all in mm). The length of the taper along the centre axis is approx. 24.8 mm as near as I can measure it.

What does it fit into?

Thanks, as ever, for assistance!

Best rgds Simon

[BazyleParticipant @bazyle]

The male screwed part isn't (well shouldn't be) part of the plug. You should find it is screwed into the taper. The short parallel bit makes it an ISO or INT taper rather than the BT version though they all have the same angle. It looks like an INT30 but the widest part of that taper is 31mm. Is here some more 'inside'? It would possibly bottom out as is. The taper length is 47 so you are well short.

There is an INT20 size but it is infinitely rare, I've only heard of it being on one grinder head. I happen to have one example owing to it being incorrectly described on ebay. #

So can you give it to Alice to make it grow a little?

[John Stevenson 1Participant @johnstevenson1]

Only just walked in from a weekend away but i have two of these Kaiser heads.

You used to be able to get them cheap as no one knows what they fit.

I'll get a couple of pics tomorrow to show the ones I have. One is tiny, it fits inside a blank R8 holder and can't remember what I did with the one that looks the same size as yours.

[Tony Pratt 1Participant @tonypratt1]

Last one I saw was fitted into a jig borer made by Moore

[Neil WyattModerator @neilwyatt]

Perhaps it fits the spike-hole on top of a pickelhaube?

Neil

[Nick HulmeParticipant @nickhulme30114]

Posted by Neil Wyatt on 20/02/2017 08:49:22:

Perhaps it fits the spike-hole on top of a pickelhaube?

Crikey, that's an obscure one, what brought that to mind and were you thinking the genuine leather or ersatz felt/cardboard variety?

[JohnFParticipant @johnf59703]

Simon, used these quite a bit in the 60's 70's and Mose had a detachable taper screwed into the body so the business end could be fitted to whatever taper the customer required.

Look carefully befor attempting to remove the taper but I think it will be removable, they are very difficult to see and join. I have a very small one and my son has two different larger ones all have removable taper fittings.

John

[peak4Participant @peak4]

Well here's another one on ebay, but this time with a further adapter.

**LINK**

I wonder if it was one of their own proprietary fittings to a series of different shanks, now discontinued and replaced with the current system, of parallel stubs and drive pins, as seen in this pdf Page 4 **LINK**

All the best

Bill

 

Edited By peak4 on 20/02/2017 09:53:33

[Terry ChandlerParticipant @terrychandler21294]

I think when they were available, you bought the arbor to fit your mill or jig borer. I have been lucky enough to find both an ISO30 M12 and an MT4 arbor for mine. It would be a shame to have to modify your boring head in any way but if you have to, do it. The arbors are more difficult to find than the heads themselves.

[EmgeeParticipant @emgee]

Terry

What method is used to lock the arbor into the head please ?

Emgee

[Terry ChandlerParticipant @terrychandler21294]

The head is screwed into the arbor clockwise so boring anticlockwise could result in some interesting times. I have a Kaiser Piccolo boring head in pdf format but i dont know how to attach it to this thread.

[Terry ChandlerParticipant @terrychandler21294]

Unobtainium Kaiser Arbors…

[Rik ShawParticipant @rikshaw]

Simon – Hope you can make use of it. I have the Model PA with an MT2 shank which I bought for peanuts. A superb piece of tooling and always a pleasure to use.

Rik

[Terry ChandlerParticipant @terrychandler21294]

Hi Rik, that is indeed a beautiful piece of kit. Can you tell if the MT2 shank is fixed to the head or if it is a removeable arbor. I believe the heads came in both metric and imperial and the accessories were optional. I'm still looking for all the accessories, if you happen to come across these, i'd be glad to hear from you.

[Rik ShawParticipant @rikshaw]

Terry – I think the MT shank MIGHT be removable but I am a bit windy about trying. The reason I say MIGHT is that the shank "foot" has a different finish to the main body. Also if you look at the photo you should see three pins on the foot on an equal PCD. An exploded diagram might answer your question but unfortunately I have no docs/manual.

Hope this helps.

Rik

[Terry ChandlerParticipant @terrychandler21294]

It looks like your MT2 shank is integral with the head. I think Ive worked out that the heads come with three different integral shanks.

One is an MT2 threaded either M8 or M10. The second type is dedicated for SIP jig boring machines and threaded M8. The third type comes with an STP stub shank to which you can attach various arbors. I wouldn't advise trying to take it apart even if you could get those three pins out. This is the STP version…

[Nick HughesParticipant @nickhughes97026]

The arbours may be retained in the same way as my D'Andrea TA120.

On the TA120, an internal bolt retains the arbour and to access this bolt, the slide and it's actuating screw have to be removed.

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