Rotary Advanced toolpath, inaccurate results

[riadhb]

Hello everybody,

I am learning mastercam and have an issue with rotary advanced toolpath. 

I have the workpiece in attachement witch is a variable pitch feed screw.

I tried all kinds of toolpaths, swarf milling and morph  give good results, but have a little problem witch I couldn't solve : at the first pass, the tool cuts a large amount of material witch will certainly lead to breaking it.

On the other Hand, Rotary advanced gives me the passes I wanted : parallel passes with constant depth of cut. Yet one problem still persists, the toolpath actually cuts the workpiece, not only the extra material to cut, so the resulted part is completely wrong. You can see in the generated toolpath that it crosses the workpiece, and in the simulation that it is different from the original workpiece.

At the end, I couldn't find the right toolpath for roughing this part without breaking the tool, anyone can help ?

[Colin Gilchrist]

You should include the "top surfaces of the screw" in the Machining Geometry Selection. To control the depth of the 1st cut, you should be using the "Stock" page of the Rotary Advanced Toolpath, using a Stock Model, to represent the "current stock condition" of the part you are machining.