Using my Carvera Air and KiriMoto with a 1/8 ball end bit.
Note: the stock is a cylinder.
Would it be preferable to use linear or rotational cutting?
Should there be a roughing pass followed by a finishing pass?
63mm Barrel turning 4th axis.kmz (227.0 KB)
It depends totally on the grain of your stock, for my chess pieces I used a block of wood en the grain was in the X direction so I used linear processing, if you cut against the grain you get breaking of the grain and rough cuts.
your stock seems to be compiled of all kinds of pieces of wood, so the grain could be hard to determine, from the pictures it looks like it’s over the Y-axis so I think it’s best to go rotational.
In the past there was a bug with the rotational thant when it was finished and you move your A-axis to 0 it rotated all rotations back to 0, It was known by Stewart, I suppose he fixed it, I didn’t test it though, so I’m not sure.
As for the roughing followed by finishing pass: all depends on how deep you are cutting, if you do just some surface “engraving” no roughing pass is neccecary, but if you need to go deeper than say 1 mm (I take it your bit can take 1 mm) I would suggest a roughing pass to clear stock before the detail pass.. I would leave 0.1-0.2mm of stock in the roughing pass.
Thanks.
The grain does run across the X axis. And it is edge grain Bocote wood. There are 30 segments in the barrel- 5 rings of 6 segments each, all glued to each other and to the 3D printed PETG-CF core. I use Starbond rubber filled CYA glue.
The bit is due to arrive Tomorrow.
By the way it’s a Clarinet barrel.
I do not understand the slicing being done.
I’ve set it up to do 2 lathe operations, one roughing linearly, and the second finishing non-linearly.
Please take a look at my settings.
Thanks,
there appear to be two issues. the first is a rendering bug where slicing only shows the arc endpoints, but preview fixes it (pictured). the second issue is that when the two lathe ops are back to back, the first mutates the second. when they are performed independently, they each produce correct results.
I will look into both and see if I can’t post a fix to the dev server.
ok, I fixed the second issue on the dev server.
Thanks, that worked in the Dev Server. Love the UI changes there!
I do not understand what just happened. Tried running the DevServer version of the .nc file. After trying to make sure all the settings were correfct, After running probing and path tracing several times. Started the Kiri file: It asked for the tool change, ok. Then in moved the bit to the leading edge of the workpiece, not at the top center, but down and out (y axiz backwards) to what appeared to be where the tip of the tool was at about the vertical center axis of the workpiece and the horizontal edge of the workpiece. It then started the spindle, and moved the x axis towards the right before trying to cut and breaking my only bit before I could react and hit the stop button.
I wish I had been taking a video as I’m sure my explanation is difficult to understand.
It is clear that the Kiri slicing is not designed for the Carvera Air 4th axis. It is also clear that I don’t know what I’m doing.
I think it didn’t start the spindle. No sign of damage to the workpiece. Must be something to do with setting the origin in Kiri to match the Carvera Controller.
I’m using the Carvera Air with the 4th axis too, worked fine for me with indexing on.
make sure you have set the spindle command (I think M3) in your machine setup, and also let it dwell 5 seconds there, Kiri has the tendency to start it up and go to work with the bit above the staring position, and that causes the bit to not be fully spinned up when it goes to work, dwell for 5 seconds to let the spindle get full speed before continuing.
Adjusted the origin in Kiri. It worked!
I’ll figure out how to dwell next time. Also will ramp in. But hey, it worked!
Very nice 
has a nice shine to it too, did you use tung-oil?
Thanks. I waxed it with Renaissance Wax. No sanding! It had a nice sheen from the milling.
