C axis limit

Hi everyone, I have a question regarding the limits on rotational axis. There is a comprehensive thread on here regarding setting the c axis to be switched from position to velocity control but it doesn’t address if there is a way to use c axis in position mode and turn it indefinitely. I think andypugh gave a theoretical max rotation of 10 ^308 in that thread but then the thread moves to switching between pos and Vel. For my concept I require the c and possibly a axis to be rotated in position control a large number of times (nothing like 10^308 but a lot more than 10^7). Does anyone know if this is achievable without heading into source code territory? Any help would be greatly appreciated.

Thanks
Anthony

Thanks for the reply. I had a quick search and there doesn’t seem to be a lot of information about wraparound - has anybody used this successfully? If so I would love to hear how it worked for you... At this stage im just trying to figure out if my unique configuration of machine is plausible to be run with linuxcnc (definitely possible but at what level of difficulty).

Thanks
Anthony

Can you provide a brief description of the device you are working on and what you want the rotary axis to accomplish.

linuxcnc.org/docs/2.7/html/config/ini-config.html

WRAPPED_ROTARY = 1 - When this is set to 1 for an ANGULAR axis the axis will move 0-359.999 degrees. Positive Numbers will move the axis in a positive direction and negative numbers will move the axis in the negative direction.

Yes it was written for a machine used in a manufacturing shop.

Chris M

Thanks for the replies guys. A description of the machine.

In my former job as a mech engineer for a motor design company we had access to a motor pole winder that was a custom machine running a Siemens 840d controller. This has 5axis sim motion and the winding axis would be used in incremental mode to wind a helix of whatever pitch you wanted. The motor pole I want to wind requires a different set up. imagine a shaft mounted off center on a rotating disc with a linear axis attached to the end - the disc /shaft /linear axis move together on the x axis while the rotating linear axis would have its linear position controlled by the y/z axis transformed appropriately depending on the c axis position. I am thinking that I can use one of the standard kins to achieve this without too much modification?! The machine will not go too fast as the dynamics are pretty bad but it doesn’t need to at this stage. I need the c axis to rotate a lot and be position controlled to couple it with the other axis and rotation of the pole itself is not an option. I have very limited knowledge about this stuff so really looking to the generosity of the experts on here to see if this is possible and at what level of difficulty. If it looks like it will be a nightmare for me and simple for someone here I would happily engage them as a consultant.

Thanks
Anthony