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I would suggest either contacting your reseller and or posting this question on the main Mastercam forum.
https://my.mastercam.com/forums/forum/customer-forum/
The reduced end does not look round so you are most likely going to have to make this in one setup as there is no way to locate the part.
We use 5C collets to hold parts like this using a fixture like these (to hold small round stock).
https://www.eaglerockonline.com/wp-content/uploads/2017/09/Wettstein-Tool-A1-210.pdf
When in edit mode click on the axis in the tree and edit the direction (X,Y, Z) to get the direction you need.
If you need to change the pivot point change the Rot. Base Point.
Look at the Bench mark link I posted above for the CPU's. The newer 13 generation CPU's are producing better times on the Mastercam Benchmark tests as well.
Look for CPU with single thread performance, these are the ones that give the best numbers on the Benchmark test. Xeon's have never performed well in Mastercam going by past reviews.
https://www.cpubenchmark.net/singleThread.html
Just for a double check run the task manager when you have the file open and look at the performance to see that the Nvidia GPU is listed.
Failing that you might try a re-install of 2023.
Since the radius does not match the end mill radius I used a Swept 2D toolpath.
See the link to a video I created.
https://www.dropbox.com/scl/fi/su7grywgxavpgu39e8657/Swept.mp4?rlkey=wxjbc417jh5nc3n6izj5lzvco&dl=0
Assuming your radius on the end mill matches the corner radius. Chain above the radius where the radius meets the wall. Then set the depth to the bottom of the radius where it meets the floor.
If you link a Mastercam file I can make a video for you.
You should likely set the Control Definition for Inverse Time feed rates for the rotary movements. You will need to increase the min inverse feed rate in the Machine Definition as well.
Your file has it set set to degrees/min for the 4th axis rotary feed.
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