Rotary Table Center Hole ?

autonoz

autonoz

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I just picked up a Made in Japan 12" rotary table. With research it looks to be made by Kamakura. Everything I have read says it should have a 4MT center hole, but this one appears to be threaded. The picture should show you what I am talking about. Im wondering if the previous owner threaded it to put this adapter in it to help lift it or has someone else seen one like this. I tried knocking it out from the back side, but no luck. I imagine it is threaded in. Any ideas to get it out would be appreciated as well.

akuma.JPG
 
Can you put a bolt in and lock it with a spacer and nut? Maybe it's not that tight just tough to get a hold of. You could mill a slot and make a large screwdriver.......
 
I tried the bolt and nut already with no luck. I thought about milling a slot, but wasnt sure why it was in there and wa waiting to see if anyone had info on it.
 
What does it look like from the outher side. Try putting a plate with a hole in it like a big washer and see if a bolt will pull i out. like A jack screw.
 
I tried driving it out from the other side. I think its threaded.
 
It certainly appears to be threaded in from the picture. Not sure which direction you tried the bolt and nut trick from, I was thinking that if you can access the threads from the back you could run a bolt in part way, lock it in place with a nut, and continue to exert tightening pressure from the back. This should have the effect of continuing to thread it out the front of the table. I was also wondering if the owner who modified it happened to have applied some red loctite to the threads when it was installed...
 
I would try to verify that the adapter is indeed threaded and if so, whether left or right hand threads. Can you determine from the backside that there was a 4MT taper originally? A couple of measurements on the exposed bore should clarify that. If red LocTite was used, it is my understanding that the only way to break the bond is with methylene chloride or heating to something like 250C.
The big question is what are you going to do when you get the adapter out? You presumably will have a bunged up Morse taper socket.
 
I'm betting it is a tapered hole. Can you provide a photo of the back side of this unit?
 
That is a new one on me. Used several but never seen one with a threaded plug. I wonder if the previous owner had made a special fixture.
 
I'm thinking it is a taper with a threaded end......
 
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