Rotary Table - Definition of Axis

[[Ke...]]

Question for Rotary Table users:

For defining the RT Axis, I have only used the Actual Part (3d-line) or the Single Sphere method. I like these methods, because they are simple and the RT Axis is re-defined at the beginning of every program... is this excessive for in a well controlled environment?

I'm thinking of picking up the Rotary Table Kit... What are the Pros & Cons of using the Invar Cylinders?

I use a RT-AB on an ACCURA II

 

[[Ch...]]

I think you mean the portable or moveable kit correct? You can still measure the axis on the part I believe, I would recommend it. If the Invar Cylinders you are referring to are just extensions with conical pockets, or similar; then I imagine the only mainly the material shaft compared to a ceramic sphere and steel shaft or the (assuming steel or harder) parts you normally measure. I'd say very negligible decrease in accuracy compared to RT A/B. I've seen one use on Duramax without too much issue.

What machine will this be for ?

I'm sure they've done testing. If you can measure your actual part,I would recommend that.

 

[[M1...]]

We also use rotary table with small tolerances and diameter calculation when scanning with RT. We get big differences (up to 0,01 mm) if we not remeasure the RT-axis on the part in every program start due to the fact that the clamping will somewhat differ between each part.

[[Cl...]]

We align the rotary using the part. Measuring two cylinders 180° apart. Then Construct a symmetry from those for cylinders. Symmetry used in rotary alignment. This helps compensate for any potential runout in the part.

Edited June 18, 2025

[[Ke...]]

Sorry, I thought that I had uploaded the image for the RT set; I use the RT-AB on an Accura II...

My presumption is that, in theory: if the RT Axis is aligned and saved, then only measurement of the part for Base Alignment would be necessary(?)

 

Edited June 18, 2025