Question about Setting 34 and rotary axis work?

[CJH]

Hi guys,

I have some questions about setting 34 in the Haas control for rotary work on the A axis. Is it necessary to have a value in there that defines the OD of the machining stock if Z "0" is set to the center of the rotary diameter? I read about the cylidrical mapping in the Haas manual and it says you need a value in setting 34. I looked in the rotary manual and there doesn't seem to be any mention of this. Is this just for the G107 command that wraps movements on a cylinder, or is it needed for more complicated work other than general indexing work? We've had our 4th for over a year now and I'm just getting to finding time to play with it more in depth, other than some of the basics.

The typical work we are going to be doing with it is indexing to machine complicated geometry, and doing full rotary machining created by CAM programming.

Chris

[HuFlungDung]

My opinion is that a diameter is necessary for the control to compute a feedrate for solitary A feed motion. Since the Haas will accept ipm feeds for A, it can then calculate the feed behind the scene, in degrees/minute.

If all you are using is the A for positioning, then all the movements would be in rapid mode, and probably a feedrate (hence a diameter) would not be required.

[CJH]

Hu,

That seems to make sense to me about the index portion. Thanks. If for instance I was wanting to machine a scale model of a "stone head" in model board, like the one pictured in the attachment, and it would fit within say a cylinder 10" in diameter, I would assume that I would need to input the dia. in the machine control. Correct? This would be in a case where I was wanting to do the machining in a full rotary application, where the tool is centered on the rotary and the moves are parallel cut in the X and, move vertically in the Z to cut the varying depths, but not merely indexing from say AO, to A90, A180, A270.

I currently have a piece very similar to this on our machine, and have it indexing to the 4 major sides. It seems to be working out, but I am interested in learning more about other methods.

Chris

[HuFlungDung]

If you are not using a wrap method on the rotary, then the diameter input is probably irrelevant because you'd never see a significant feed move in only A.

Naturally, you can only input a single diameter, so if you had a multidiameter part to machine with wrap, then you'd need to compromise, or else using inverse time, but even for that, you'd need help from a CAM system capable of calculating the inverse time feedrate for every feed movement.

[Mike xyz]

Chris,

If you are just positioning with your A axis you will not need to put a value into setting 34.

If you are using a feed rate you will need to put the diameter of the part being cut into setting 34.

If you are cutting a part with different diameters, put the largest diameter into setting 34. That way the feed rate will be correct on the largest diameter and a bit slower on the smaller diameters.

Best regards.

Mike