Centroid Community CNC Support Forum

Planning the details of our next Centroid conversion. This lathe has live axial and radial tools, as well as a spindle brake. Can the Oak controller and CNC software:
1. Do polar coordinates using the spindle drive as a servo, like Fanuc, Siemens, etc. for drilling operations?
2. Do live profile milling using said rotary C-axis?

It's not a make/break deal on the above, but would be good to know.

And, is there a spindle drive / VFD / inverter you'd recommend that can play well with the Oak to perform closed-loop spindle orientation?

Magneto wrote: ↑Thu Dec 28, 2017 9:09 pm Can the Oak controller and CNC software:
1. Do polar coordinates using the spindle drive as a servo, like Fanuc, Siemens, etc. for drilling operations?

I do not believe so. I have not been able to make it work using fusion 360.

Magneto wrote: ↑Thu Dec 28, 2017 9:09 pm Can the Oak controller and CNC software:2. Do live profile milling using said rotary C-axis?

Theoretically yes. I have been able to coordinate moves like this in the CAM files, however I do not have these connected to a live machine yet.

Clay

video at bottom of page http://www.centroidcnc.com/cnc_c_axis_lathe.html

cnckeith wrote: ↑Wed Jan 03, 2018 7:02 pm video at bottom of page http://www.centroidcnc.com/cnc_c_axis_lathe.html

Hey Keith, care to share some of that G code? I want to finish my post processor.
Was that written in polar coordinate mode?

Clay

i'll see if i can dig up the original program. , just posted below
C axis is in degrees.
C axis feedrate is in degrees per minute.

cnckeith wrote: ↑Thu Jan 04, 2018 12:24 am it was written in Intercon. i'll see if i can dig up the original program.
C axis is in degrees.
C axis feedrate is in degrees per minute.

Thanks Keith.
I would seriously like to see how that was done in Intercon. I am new to rotary axis programming(mill or lathe) but I don't see any intuitive way to do it in Intercon itself.

I understand why it's going slow. I am trying to understand what the feed-rate changes look like when switching from angular movement into straight lines and back.
Do you have an example of face milling done on the lathe? I actually managed to make this part post from Fusion 360 to CNC12 and it followed all of the moves correctly. Both the turning part and the milling part. Three of these are drilled holes, and one is a helical bore. However, when I tried milling a straight line on the face, the feed rate was correct while the rotary feed-rate was too slow.

I want to be the first Acorn user to make a Rook on a lathe!


Clay

for the offset circular pocket in the solid model screen shot... you will have to do in a cad/cam system.. this requires the cad/cam system generate some fancy X C moves.

see this thread for c axis sample g code program.
viewtopic.php?f=20&t=1336&p=7643#p7643