Rotary table problem

Hi Everyone,

I,m sure everyone remembers the on-going-saga of my rotary table.

I decided to address the problem,and having discovered that the center bush is hardened,was unable to machine it true,using an end mill on the milling machine. So I then set about dismantling it to try pressing out the bush,using a 10 ton press. I got most of it apart [never seen the inside of it before ],but was still unable to get at the back of the center bush. I can see the underside of the bush but there is another piece,the wormwheel?,in the way. This seems to be held in place by four screws,which I removed but could not remove the item itself. The center shaft appears to be part of this unit and that,s what prevents access to the bush. At that stage I held fire and decided to refer to a higher Authority,namely,your good selves,having put my lump hammer away,for the moment.

Can anyone out there throw any light on this,as to how this thing comes apart ? Since it is held in place by screws,it must be a separate piece and it seems to be the only thing left to remove. I,ve no doubt that someone has taken these things apart many times.

I did consider trying to bore out the bush on the lathe,in order to get back to the cast iron body and then trueing it up on the mill,but I suspect that the boring bar would have a hard time,if indeed it would work.

All help and advice welcome. [The hammer is still to hand,should all else fail !]

Did you re-register? You appear to have made only 4 posts including this one - and none relate to a rotary table. Perhaps you posted under a different name?

Perhaps he is now “larry phelan 1”?

I am one and the same ! What happened was that while trying to clear out old history,I managed to clear out everything,including my own Email address ! The result was that I had to set up a new one Dont even go down that road !!!!! I,m still tearing out what little hair I have left.

Any views on my table ?

Larry, all your history must still be on the forum server, surely? Someone (probably Neil or mods) should be able to reconnect or merge them with your current registration?

Whilst Larry is trying to regain his identity ... This might be useful: **LINK**

http://www.model-engineer.co.uk/forums/postings.asp?th=125429

MichaelG.

I,m sure my identity problem will be resolved in time,right now I,m more concerned with sorting out my table. It galls me to get this far without being able to correct it..

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Which is why I posted that link to the old thread

MichaelG.

.

Whilst = during the period of time in which

Edited By Michael Gilligan on 17/04/2018 14:24:02

I have tried to follow the suggestions offered in the previous thread without success which is why I am now at this point. Would it not be easier to just treat this as a new problem and move on from here?

You can rest assured that I am the same body. My computer problems will sort themselves out in time,they are not my main concern right now. I will still be thankful for any advice regarding the table. What I need to know is how to remove this center unit in order to gain access to the underside of the bush so that I can press it out.

Larry,

Please forgive me if I am intruding !!

I really posted the link for the benefit of Muzzer and ndiy ... so that they had a reference to work from.

MichaelG.

If you set up the part on a lathe to bore it why not make a cylindrical bore of a convenient size in the hardened ring. None of the rotaries I have owned had MT sleeves. Never missed them. I much prefer a cylindrical bore to locate on.

Taking a short breather from my current chores ...

Here is Larry's follow-up thread about the Rotary Table:

**LINK**

http://www.model-engineer.co.uk/forums/postings.asp?th=134887

... Sorry, I haven't got time to join in the discussion.

MichaelG.

Just made a mess of this post again !

Michael,you are not intruding,far from it,all are welcome.

John, Like you I am not too interested in having an MT center,as long as the center is true to the table edge,that,s all that matters. In this case it is not,so the plan was to press out the bush and set the table up on the mill to correct the error,as advised. The problem is that I cannot get at the rear of the bush to press it out. I did try boring out the bush but it is hardened and I,m not sure that the boring bar could handle it.It did not seem too happy. If I thought I could bore the bush out,back to the cast iron of the table,I would do so and then set it up on the mill and proceed from there. I just thought that being able to remove the bush would make things easier.

I managed to dismantle most of the table but could not see how to remove this unit held in by four screws,which would suggest that it is a separate piece [indeed,it must be ]. If I cannot remove it,I will try again boring out the bush with a tipped tool.

Thanks, but of no benefit to me. I was perfectly able to do a search for ‘rotary table’.

If I can make a suggestion Larry, if you put “Rotary Table tear down” in YouTube there are a number of videos that come up. Perhaps one of them may be of help?

+1^2

Waaaay more useful than a Morse taper.

Andrew

to Michael Gilligan - you have a PM

My thanks to you Vic,

I looked up U Tube as you suggested and while it did not answer my question [the table in question being a Vertex with a center bore,part of the table,not a press in unit ] it did make clear that this unit which is giving me trouble,is indeed a separate unit,which must come out. I will attack this again within the next day or two.

I am surprised that nobody else has come across this problem before. I might add that the Vertex table seems to be a better design than the Homage [could it be worse? ]

F W I W, my Vertex HV6 has a separate 2MT steel bush in the centre. (It came out one day!), so Larry's bush is probably removable.

Is it possible to make up some form of puller (Fine thread; - UNF or BSF rather than metric coarse; nut with plenty of engagement - 2D; and bush to receive the central bush from the table) Possibly, having applied the maximum of force, a tap with a mallet might just start things moving. If it is possible to apply a heat gun to the outer rim of the table after tightening the extractor, this may help; allow time for the heat to soak through. Things may come apart quite suddenly!

Once out, you can decide further action.

Suggestion: if you decide to stick with the 2MT, could you get a 2MT straight socket ground on the OD, (and maybe shortened) to suit the bore in the table, and then apply an anaerobic to secure it in place even more firmly.

Howard