501 vs. 502 engraving brass

What are some recommendations on when to use the 501 engraver vs. the 502 engraver? I realize the difference is 20 degrees but when should you choose which? I seem to be easily snapping the tips off of 502’s.

Im cutting brass and using the following settings (in MM):

Stepover: 0.200
Depth per pass: 0.076
Plunge: 75.0
Feed Rate: 150
RPM: 24000

Im not exactly sure because the things i run have really long times so i cant just stand and watch it. If i had to guess it would be the plunge but i cant be sure. I just ran a “big” job using a 502 with the settings in MM of:
Stepover: .200
Depth: .076
Plunge: 50
Feed: 120
RPM 18000

Nothing broke but it took a reallllly long time to run. specially since the plunge was set so slow, it plunges slow and retracts just as slow. Is there a way to control the Safety Height? That would save time too.

OIC. Im only using Carbide Create. I don’t know CADD at all so Im just doing really basic stuff

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