How do I avoid cutting into the part when using a contour chamfer?

[davidcaro321]

As a beginner in CAD, can somebody help me with my part that I downloaded a stp file for. The model already has chamfers in the design, so I have read online that using a contour is the best method. It works for the chamfers that don't have any other material surrounding it. However, for the chamfers that do have surround material, it just completely cuts through material. 

Also, how would I chamfer the vertical chamfer that are also shown in the pictures I have provided?

[a.laasW8M6T]

Hi

There's a few ways to go about it, see video for some methods you could use

[usolutionsTRFWW]

My goto is
1) make manufacturing model
2) delete chamfer features
3) chamfer with chamfer toolpath as usual

[programming2C78B]

2D chamfer is easiest, but I use 2d contour and use a -(tool radius) tangential extension. Arc lead in set to 0, linear lead in set to double chamfer size.