Manufacture fillet

[gijsYVNPU]

Hi all,

I'm having a hard time understanding which operation to use for milling a fillet on my workpiece.
I tried 3D blend, contour and scallop, but started with 2D adaptive as I saw at some posts here on the forum.
All failed , so I'm looking for some advice here.

Thanx in advance!

[da_fish]

Hi, I use Blend a lot and it works well:

With Blend you can turn on Spiral in the passes tab to avoid any transition marks.

Another good option for your part is the "Spiral" tool path.  

I attached a rough mockup of your part that you can look off of.

[programming2C78B]

Scallop, spiral, blend, and flow would all work. Spiral is my go to for this. Ensure your heights are set properly - you will have to cut below the bottom to surface this completely. 

Program only one pc then apply a rectangular pattern.

[gijsYVNPU]

Thanx for the quick reply!
I managed to to go with spiral, though I have two questions:

The operation time is 45min. Isn't that very long?

And I get a stock shoulder error. I'm trying to figure out where collission might happen, but seem to overlook it?

[da_fish · Accepted solution]

Well, your part is 250mm in diameter and your are only feeding at 1000mm/min. So yes 45min is a little long but it's also a large surface. You can adjust the feed and stepover amount to help with this.

Regarding the last question:

You can see that the shaft is hitting the stock. Either rough out the stock first or use a long flute. Roughing out the stock before finishing is ideal as it will leave a better surface finish.

[gijsYVNPU]

Well got it! And learned along the way. Thanx for the help.

[programming2C78B]

If this is wood, you want to use a 8% stepover and feed as fast as your machine can go. 

[gijsYVNPU]

Yes,
Tried to increase the stepover and speed. Altough I first need to learn how to calculate 8% of what?

Result in machining time of 18 minutes now. Much better.

I have a spindlespeed of 16000 rpm, stepover of 1.5mm

[programming2C78B]

8% of your tool diameter. Feed can easily be 200ipm+ with 16k rpm 2flute tool.