Live tool lathe, spindle orientation

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Magneto
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Live tool lathe, spindle orientation

Post by Magneto » Thu Dec 28, 2017 9:09 pm

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?

frijoli
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Re: Live tool lathe, spindle orientation

Post by frijoli » Sat Dec 30, 2017 3:23 pm

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
Outside Winston-Salem, NC

cnckeith
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Re: Live tool lathe, spindle orientation

Post by cnckeith » Wed Jan 03, 2018 7:02 pm


frijoli
Posts: 342
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Re: Live tool lathe, spindle orientation

Post by frijoli » Wed Jan 03, 2018 8:35 pm

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
Outside Winston-Salem, NC

cnckeith
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Re: Live tool lathe, spindle orientation

Post by cnckeith » Thu Jan 04, 2018 12:24 am

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.

frijoli
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Re: Live tool lathe, spindle orientation

Post by frijoli » Thu Jan 04, 2018 7:36 am

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.
:o
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.
counter boring a hole on the face of a lathe part 1.jpg
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!
Image

Clay
Outside Winston-Salem, NC

cnckeith
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Re: Live tool lathe, spindle orientation

Post by cnckeith » Thu Jan 04, 2018 10:48 am

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.

cnckeith
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Re: Live tool lathe, spindle orientation

Post by cnckeith » Thu Jan 04, 2018 11:42 am

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

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