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Spindle axis vs. "Z" axis...
At work I was discussing this matter with a customer.
I'm interesting in knowing conventions for labeling your axes. While this has virtually no deep meaning in manual machining, it is exceptionally important in CNC machining. I am under the assumption that the "Z" axis is always coaxial with the spindle. This means that vertical CNC mills have the Z axis going "up and down", horizontal CNC mills have the Z axis going "forwards and backwards", horizontal CNC lathes have the Z axis going "left and right" while vertical lathes have the Z axis going "up and down". Are there any standards which dictate axes for certain types of machines? I.e. ISO, DIN, ASME, AISI, CSA, MIL Spec, etc. We'll leave out extra axes like W for a bridge mill and that kind of thing... Thoughts? Regards, Robin |
Hey Robin,
Machine specific in some cases, but do a Google on EIA 267-C I've seen 5 axis machines with spindles "noses" that swivel. The "nose" is a 45 degree mitre joint, so that if it is swiveled or twisted one certain way it forms a 180 degree line with the spindle motor shaft, lets say that position is horizontal, and if swung 180 degrees it forms a 90 degree joint to be vertical. If from the 180 position it is swung only 90 degrees, it stays horizontal, but at a 90 degree horizontal to the "180". That make any sense?? It works as a "universal" head, so that in one configuration it would be operating as what you referred to as a horizontal mill, and in the second configuration (2 seconds later), the same machine is operating as a vertical. I just don't know if the "axis designation" changes at that instant too. I don't think it does, but I will ask on Monday. Take care. Brian Lawson, Bothwell, Ontario. XXXXXXXXXXXXXXXXXXXXXXXX On Sat, 19 Feb 2005 18:11:58 -0500, "Robin S." wrote: At work I was discussing this matter with a customer. I'm interesting in knowing conventions for labeling your axes. While this has virtually no deep meaning in manual machining, it is exceptionally important in CNC machining. I am under the assumption that the "Z" axis is always coaxial with the spindle. This means that vertical CNC mills have the Z axis going "up and down", horizontal CNC mills have the Z axis going "forwards and backwards", horizontal CNC lathes have the Z axis going "left and right" while vertical lathes have the Z axis going "up and down". Are there any standards which dictate axes for certain types of machines? I.e. ISO, DIN, ASME, AISI, CSA, MIL Spec, etc. We'll leave out extra axes like W for a bridge mill and that kind of thing... Thoughts? Regards, Robin |
"Brian Lawson" wrote in message ... Hey Robin, Machine specific in some cases, but do a Google on EIA 267-C I've seen 5 axis machines with spindles "noses" that swivel. The "nose" is a 45 degree mitre joint, so that if it is swiveled or twisted one certain way it forms a 180 degree line with the spindle motor shaft, lets say that position is horizontal, and if swung 180 degrees it forms a 90 degree joint to be vertical. If from the 180 position it is swung only 90 degrees, it stays horizontal, but at a 90 degree horizontal to the "180". That make any sense?? It works as a "universal" head, so that in one configuration it would be operating as what you referred to as a horizontal mill, and in the second configuration (2 seconds later), the same machine is operating as a vertical. I just don't know if the "axis designation" changes at that instant too. I don't think it does, but I will ask on Monday. While its ultimately up to the machine builder, generally the axes are designated from the "machine home" position....so if a machine with a tilting head homes out at vertical, and the rotary centerline is parallel to the x ways, the tilt axis would be designated as -A- To add rotary axis, X=a Y=b Z=c And for parallel axes, X=u Y=v Z=w -- SVL |
"Brian Lawson" wrote in message ... Hey Robin, Machine specific in some cases, but do a Google on EIA 267-C I've seen 5 axis machines with spindles "noses" that swivel. The "nose" is a 45 degree mitre joint, so that if it is swiveled or twisted one certain way it forms a 180 degree line with the spindle motor shaft, lets say that position is horizontal, and if swung 180 degrees it forms a 90 degree joint to be vertical. If from the 180 position it is swung only 90 degrees, it stays horizontal, but at a 90 degree horizontal to the "180". That make any sense?? It works as a "universal" head, so that in one configuration it would be operating as what you referred to as a horizontal mill, and in the second configuration (2 seconds later), the same machine is operating as a vertical. I just don't know if the "axis designation" changes at that instant too. I don't think it does, but I will ask on Monday. Take care. Brian Lawson, Bothwell, Ontario. XXXXXXXXXXXXXXXXXXXXXXXX On Sat, 19 Feb 2005 18:11:58 -0500, "Robin S." wrote: At work I was discussing this matter with a customer. I'm interesting in knowing conventions for labeling your axes. While this has virtually no deep meaning in manual machining, it is exceptionally important in CNC machining. I am under the assumption that the "Z" axis is always coaxial with the spindle. This means that vertical CNC mills have the Z axis going "up and down", horizontal CNC mills have the Z axis going "forwards and backwards", horizontal CNC lathes have the Z axis going "left and right" while vertical lathes have the Z axis going "up and down". Are there any standards which dictate axes for certain types of machines? I.e. ISO, DIN, ASME, AISI, CSA, MIL Spec, etc. We'll leave out extra axes like W for a bridge mill and that kind of thing... Thoughts? Regards, Robin |
Those are rotational axes usually designated as A , B and C.
For some machine configurations they may be somewhat non standard. Axes designations never change else you could not program them. "Robin S." wrote in message ... "Brian Lawson" wrote in message ... Hey Robin, Machine specific in some cases, but do a Google on EIA 267-C I've seen 5 axis machines with spindles "noses" that swivel. The "nose" is a 45 degree mitre joint, so that if it is swiveled or twisted one certain way it forms a 180 degree line with the spindle motor shaft, lets say that position is horizontal, and if swung 180 degrees it forms a 90 degree joint to be vertical. If from the 180 position it is swung only 90 degrees, it stays horizontal, but at a 90 degree horizontal to the "180". That make any sense?? It works as a "universal" head, so that in one configuration it would be operating as what you referred to as a horizontal mill, and in the second configuration (2 seconds later), the same machine is operating as a vertical. I just don't know if the "axis designation" changes at that instant too. I don't think it does, but I will ask on Monday. Take care. Brian Lawson, Bothwell, Ontario. XXXXXXXXXXXXXXXXXXXXXXXX On Sat, 19 Feb 2005 18:11:58 -0500, "Robin S." wrote: At work I was discussing this matter with a customer. I'm interesting in knowing conventions for labeling your axes. While this has virtually no deep meaning in manual machining, it is exceptionally important in CNC machining. I am under the assumption that the "Z" axis is always coaxial with the spindle. This means that vertical CNC mills have the Z axis going "up and down", horizontal CNC mills have the Z axis going "forwards and backwards", horizontal CNC lathes have the Z axis going "left and right" while vertical lathes have the Z axis going "up and down". Are there any standards which dictate axes for certain types of machines? I.e. ISO, DIN, ASME, AISI, CSA, MIL Spec, etc. We'll leave out extra axes like W for a bridge mill and that kind of thing... Thoughts? Regards, Robin |
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