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31st Jul 2018, 06:24 PM #1Most Valued Member
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Small rotary table - center taper issue
I've got a small (150mm) rotary table - one of these http://www.homge.com.tw/product-HorizontalVerticalRotaryTable-HHV-150,200,250,300,350,400.html?cid=6
Its got a MT2 bush in the middle which you can see in the image, but if I try and insert a MT2 center it won't go in far enough to seat - the bore behind the tapered bush is too small.
Just wondering if its a normal thing with these small Asian RT's and they perhaps have a matching center with a short taper, or more likely its not normal I've just got a dud one that missed a boring process...
Steve
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31st Jul 2018, 06:47 PM #2Most Valued Member
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Are you saying that the taper is not MT2 or that the taper is short, not going all the way through.
I have a few tables of different sizes and find that the taper does not go all the way through any of them,one has the taper going through from the table about half way, with this one if you put a store bought taper in it may not seat correctly, you may need to shorten it or make your own.
The other ones I have have the taper only at the front and rear with an under cut in the centre.
Sent from my T85 using Tapatalk
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31st Jul 2018, 06:54 PM #3Most Valued Member
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Its MT2 but its just a short bush with the taper in it. The taper ends roughly 30mm below the table surface.
Sounds like you've got one similar and mine isn't a lemon!
Guess I'm going to get some taper cutting practice....
Steve
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31st Jul 2018, 08:18 PM #4
Hi Steve,
I have one and the MT2 taper in mine only goes down 30 mm. I turned up a brass plug with an M6 threaded hole down the middle, so that I can pull it out without disturbing the table. I also made a threaded centre for setting it up under the spindle.Best Regards:
Baron J.
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31st Jul 2018, 11:26 PM #5Most Valued Member
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Not sure I've got what you mean Baron.
So the plug just blanks the hole, and the thread allows you to extract it if you need to insert an arbor or similar into the taper?
And the center can also screw into the plug, so you can line it up with the spindle - just for setup purposes?
Steve
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1st Aug 2018, 01:48 AM #6
Rotary Table Accesories !
Hi Steve,
Yes that is just about spot on ! Though I no longer bother with MT2 arbours, The only one that I have is a threaded one with a threaded end to suit my Myford chuck. Though I would rather secure a chuck directly to the table. Much much less vibration and chatter particularly on a larger item.
If you look at the pictures below, you will see that my tapered plug has an extended spigot. I use this to centre a plate mounted on the rotary table. I have also made "T" nuts to suit and secure the plate and any work secured to the plate by means of M6 cap screws. The family picture shows some of the fittings that I made. The plate is made from a full hard aluminium and is 3/4" (20 mm) thick and the plug was from some brass shear pins that I acquired from the local scrap yard.
31-07-2018-001.JPG 31-07-2018-002.JPG 31-07-2018-003.JPG 31-07-2018-004.JPG
The double ended screw was originally intended to screw into the plug from the bottom in order to secure it from pulling out, but I realised that with the plate on top it couldn't be pulled out. The M6 cap screws, screwed into the plate, is where I drilled and tapped to hold down a part that needed the use of the rotary table. See my thread on the Toggle clamps that I made.
//metalworkforums.com/f303/t200759-toggle-clamps
31-07-2018-005.JPG
This is plug sat in the recess in the bottom of the plate. In the picture it doesn't look tapered, but I assure you it is, a push with your thumb and you cannot pull it out without using a screw in there.
Hope this helps...Best Regards:
Baron J.
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1st Aug 2018, 06:39 PM #7Most Valued Member
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Thanks for the explanation and pics, some very usefull info there to help us newbies.
I seem to understand stuff better when I see it!!
KrynTo grow old is mandatory, growing up is optional.
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2nd Aug 2018, 12:15 AM #8Senior Member
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- Sep 2007
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I have almost exactly the same thing, but I made the straight spigot quite a bit longer, so I can grip it in the 3 jaw chuck when I am mounting it on the table, it is a simple way to centre it quickly and almost accurately (about .002" runout)
If I want more accuracy I use a 4 jaw chuck, but that is a lot more mucking around.Regards
Bradford
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