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Trunion diameter settings

Just talked to Haas tech, the settings are ignored if you use inverse time feed, which they strongly recommend.
 
Inverse time feed is the standard for rotary feed. You must input the diameter of your workpiece for the inverse time to work correctly.
 
How often would you actually be making a feed move with the A (parallel to X) axis? If never, then the control doesn't need to know a value, because it will only be using rapids for that axis.
The axis where the diameter matters is the one that would be rotating during a cutting feed movement, because then the control can calculate a proper angular feedrate based on ipm, because it knows the length of the circumference of the circle you are working at.
 
So if I'm doing a 5 axis simultaneous cut....I set the a axis diameter to the swing of the face plate, or the top of the part or what?
 
The style of table you are using will dictate somewhat what you would use. Your trunnion table is more like an indexer mounted on an indexer, which puts the swing radius of A quite a distance from its centerline. Therefore, its not too likely that you're going to have a large variation in radius when cutting on the part (if indeed, you actually ever do cut while A is rotating), considering that the minimum radius might be....what....3 or 4 inches? And the part might be sticking out of the collet an inch or two, so maybe a 5" swing radius would be good for an average value. At worst case, your feedrate will be a small proportion over or under what the control calculates for a 5" radius circle, when it converts ipm to degrees (internally).

And the more important radius is likely the work circumference on the B axis, as that is where you'd be doing your wrap cuts. So put a value in there that is related to your actual part radius.
 








 
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