Infeed angle

[jmichaud1]

For threading on Citizen Swiss machinining centers, what is the best infeed angle to use? The book says 00,29,30,60,and 80 are all valid angle. Is one better than the rest?

[Perfect Circle]

What kind of thread are you cutting?
Those angles are for diff. threads.
0 deg is for direct straight in or plunge
29 deg is for acme thread...
30 metric trapizoidal
60 standard
80 german pg

http://books.google.com/books?id=JNn...0angle&f=false