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Old 09-13-2010, 12:44 PM
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platypus20 platypus20 is offline
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Default Jack's Way Of Centering A Lathe Chuck On A Rotary Table

With all of the current talk about Rotary tables, after talking to a few people, I will attempt to show how I center the lathe chucks on my rotary tables, that has proven quick, accurate and repeatable.

The attached pics are of the 6", model H7527 rotary table and the 6-3/4", model G9831 plain back lathe chuck, both from Grizzly, the same procedure is used on the 10" RT and chuck, I also use.

The center hole of the 6" RT, is MT#2, so I use a Grizzly model H5895, MT#2 x MT#2 extension. The extension is inserted into the center hole, the chuck (that was drilled to match the RT's slots) is lowered down over the extension, the mounting bolts started, then the lathe chuck tightened onto the extension. At this point the mounting bolts are tightened, chuck opened, and the extension removed. The center of the chuck is now centered onto the center of the RT. All that is required before use is a quick check with a dial indicator and you are ready to go.

1 - the H7527 rotary table
2 - the G9831 plain back chuck, blue arrows the original 3 mounting holes, the red arrows, the new 4 mounting holes, to match the RT slots
3 - the specially made t-nuts
4 - the H5895 MT#2 x MT#2 extension


jack
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Old 09-13-2010, 12:54 PM
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5 - the extension in the RT
6 - the chuck on the RT, bolts started
7 - the mounting bolts tight, the extension removed, ready to use.


I've been using this method for quite a while and have had great results, the dial indicator, again is used to prove its centered, but rarely is any further adjustment needed as the B&S indicator needle barely moves.


jack
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Old 09-13-2010, 01:03 PM
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Bravo!

I will add this to my short list of things that are: Good, Fast and Cheap.
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Old 09-13-2010, 03:37 PM
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That is sexy.

Thanks Jack

Scott
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Old 09-14-2010, 08:20 AM
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I dont know jack (no pun intended, honset) about machining, but even I can understand that, so simple, but effective.
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Old 09-14-2010, 08:49 AM
Lew Hartswick Lew Hartswick is offline
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How do you remove the morse taper extension? My experience with tapers is
I have to bump it from the back end to release it.
Our rotary table has a straight hole in the center.
...lew...
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Old 09-14-2010, 09:08 AM
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Schmart and simple!

Once the chuck is centered, you can mount a rod in the mill spindle, grip it with the chuck and then clamp the RT to the mill table to center it under the spindle axis.
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Old 09-14-2010, 11:25 AM
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Quote:
Originally Posted by Frank Ford View Post

Once the chuck is centered, you can mount a rod in the mill spindle, grip it with the chuck and then clamp the RT to the mill table to center it under the spindle axis.
Thats exactly how I do it


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Old 09-14-2010, 11:38 AM
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Yet another random never used a machine tool question......


Once upon a time someone, digr I think, posted some work he'd done where he was almost using a lathe as a mill.


using a chuck on one of these rotary tables could you do basic lathe work on the mill by rotating the part past the spinning mill bit, or would they not be strong enough for that?


Or is that exactly what ye use them for?
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Old 09-15-2010, 04:10 AM
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Thats the bestest easiest method I have seen.
Thanks for posting
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