Gallery, Projects and General > Oooops!

Bent boring and facing head...

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jimwhiting:
Morning everyone!

I've been a long time lurker reading all your posts/videos/project logs and learning massive amounts so thank you!

I recently thought I hit the jackpot winning a Mizoguchi boring and facing head on ebay for next to nothing... However it looks like it has been crashed... the head wobbles in relation to the MT3 taper...

Now I understand this will still be okay for boring holes, and fly cutting... but facing a flat bottomed hole now out of the question.

So what would you do? The seller described the item as: "MST facing & boring head in excellent condition comes in box with boring bars and head tools."

Also what about fitting a sleeve and machining a new MT3 taper to make it true? (I have lathe and milling machine available).

Anyway... looking for idea's as I contact the seller and see what he says...

-Jim.

awemawson:
Jim hello and welcome aboard.

The majority of professional boring heads have detachable arbors, as the manufacturer would want to sell them into a variety of machine markets.

Some screw on (most) but I've seen ones with a recessed flange - perhaps you can manufacture a new arbor to sort the wobble?

Andrew

Pete W.:
Hi there, Jim,

I'm not familiar with that particular boring head but I suggest you examine it carefully - the MT3 shank and the main body of the head just might be two separate pieces.  Might be screwed, might be press-fit, might be Loctited.  If you can access the maker's catalogue and they offer the same boring head with a choice of shanks, I'd suspect that would increase the probability that shank and body are separate.

If so, and if you can separate them, a new MT3 shank might cure the problem and I'd think it would be easier than sleeving and re-machining the existing MT3.  You could start with a MT3 blank end arbor and machine just the blank end to suit the boring head body.

Just my two penn'orth.

Looks like Andrew and I were typing at the same time!  Great minds think alike, ............   :D   :D   :D    Good morning, Andrew.

jimwhiting:
Hi Pete, Andrew,

I stripped some of it apart last night before swmbo requested an audience. Unfortunately I couldn't see a join before the body of the head hollows out and has part of the mechanism inside. So I might be out of luck.

It was sold with a int-40 sleeve which was over the MT3 shank. All the material I have seen says that this is a Japanese copy of a Wohlhaupter UP3.

I will have a closer inspection of the head tonight and let you know.

Thanks!

Jim.

awemawson:
You can often identify if assemblies are in two parts by oiling with a light oil (WD40 will do) - wipe clean then gently warm the part with a hair drier. Hidden joints are revealed by small traces of oil coming out of the join.

Andrew

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