NX Creating a back facing operation for a STEP2HOLE using a dynamic tool

2021-10-06T23:27:50Z

NX for Manufacturing

Summary

Details

The customer has an "upside down" counterbored hole (STEP2HOLE) and wants to do a back facing operation using a dynamic tool. A simple example of the geometry can look like this:

How can this be done in NX, making sure that the simulation is also correct?

Solution

There are a few different parts to this suggested solution. The operation to use is a Generic Feature Operation (GFO). However, at the time of writing this article, it is not possible to flip the direction of a GFO. The workaround for this is to create a Feature Mapping Rule to reverse the recognized STEP2HOLE.

The next step is to create a tool, in this case a T Cutter (but we will come back to the tool later on).

Then it is time to create the Generic Feature Operation. We will need to insert some User Defined Events between the motions to turn on/off the spindle, to make sure we get the correct NC code output later on.

Now we could simulate the operation and the material removal would be correct. However, since we are using a T Cutter, the tool will go through the part, making collision checking useless. A way to get around this issue is to create a tool assembly. In this tool assembly, the CUTTING_SPUN geometry represents how it looks when cutting.

But the tool itself looks like when not cutting.

This can be done by adding the insert component to the cutting position and spin the geometry. Then move the insert component inside of the non-cutting component before saving the tool. If the tool assembly is done correctly, the simulation will now use it instead of the parametric T Cutter. The tool will move through the hole with the spindle off.