Re: [CAD_CAM_EDM_DRO] Re: rotary table as 4th axis

Jon, I agree. Rotary tables have no chuck generally making setup more difficult in a vertical configuration. Using them horizontally is waste of time because any 2-axis CNC machine is more than adequate for any machining that the rotary table would be capable of. In short, rotary tables are dinosaurs for CNC. To use them vertically means if they have no 90 degree plane they have to be mounted to an angle plate. And to run between centers involves the use of a lathe dog and a tailstock. Or mount a chuck on their table which involves dialing in and all that. For my 4th axis I use an tilting index head with integrated 3-jaw chuck. Its ability to tilt makes possible the helical slotting and machining of cones or tapered diameters. A rotary table can do this as well but involves a huge sine plate. And they arent cheap. Find an old tilting index head and throw a servo on it. They are much more massive and precision with regard to their gearing and the ability to take up all backlash. I had
two rotary tables an 8" and a 12" when I got my CNC up and running they went Ebaying. They're for manual machines, not CNC.

Ron

Jon Elson <elson@...> wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "rogerstykle"
>wrote:
>
>
>>has anyone here been able to convert a regular 6" 8" rotary table
>>
>>
>to
>
>
>>cnc?
>>

If you have CNC already, you have very little need for a rotary table.
Much better is an indexing head, which is designed from the ground
up for the sorts of things you'll be doing.

Jon



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