Is a conventional lathe a 1.5 axis machine tool?

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Discussion Overview

The discussion centers on whether a conventional lathe should be classified as a 1.5 axis machine tool. Participants explore the definitions and characteristics of machine axes, particularly in relation to lathes and other machine tools like mills and drilling presses. The conversation includes technical explanations and comparisons of different machine configurations.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants assert that a lathe has two axes of motion (X and Z), but only one can be effectively operated at a time, leading to the classification as a 1.5 axis machine.
  • Others mention that a CNC lathe can coordinate motion on both X and Y axes, qualifying it as a 2-axis machine.
  • One participant suggests that the classification of a lathe as a 1.5 axis machine may relate to the length of travel, prompting questions about what constitutes a 2-axis machine.
  • Another viewpoint proposes that a lathe could be considered a 4-axis machine due to additional movements, although this perspective is noted as more academic.
  • There are inquiries about the classification of movements in mills with multiple axes, questioning why separate actuator movements are counted as distinct axes despite producing the same relative motion.

Areas of Agreement / Disagreement

Participants express differing views on the classification of lathes, with no consensus reached on whether a lathe is definitively a 1.5 axis or 2-axis machine. The discussion remains unresolved regarding the implications of different definitions and classifications.

Contextual Notes

Some statements rely on specific definitions of axes and machine configurations, which may vary by context. The discussion includes assumptions about the operational capabilities of different lathe models and the implications of CNC technology.

Mohankpvk
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In a lathe, the cutting tool can be moved in the horizontal plane(x and y axes).So x and y are the 2 axes.
But one of my teachers said that lathe is a 1.5 axis machine.Is it right?
Why are conventional drilling press,shaper and planer half axis machine tools?
 
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it is good for you to ask questions. it is how we learn.

From a very good machine tool publication-
https://www.practicalmachinist.com/vb/cnc-machining/definition-each-lathe-axis-152203/

On a lathe it is standard for the Longitudinal to be Z and the Radial to be X. Vectors are I and K

The axis parallel to the spindle axis is always Z, whether its a mill or lathe. And, for the lathe, the axis that controls the diameter is always X.

And the Lathe rotary axis conform to the standard of A rotates around X, B around Y, and C around the Z.
C is the most common on a Lathe, as it relatively easy to turn the chuck into a C axis.



your teacher may be referring to the length of the lathe travel. I have sold coordinate measurement machines and these are typically described in length of travel. so see if the lathe can traverse 1.5 meters or 60 inches.
 
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Ask your teacher what is needed to make a lathe a 2 axis machine.
Or ask the teacher to name a 2 axis machine.
 
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a manual lathe is a '1.5 axis' machine, in machinist parlance. It has 2 axes of motion, but only 1 can be (usefully) operated at a time. A lathe with CNC on X and Y can coordinate motion, and is a 2-axis machine.
 
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Dullard said:
a manual lathe is a '1.5 axis' machine, in machinist parlance. It has 2 axes of motion, but only 1 can be (usefully) operated at a time. A lathe with CNC on X and Y can coordinate motion, and is a 2-axis machine.
Nice answer.I have another doubt.
In case of mills with more than 6 axes,the tool movement along x and the table movement along x (both have separate actuators) are counted as two different axes.But both these movements produce the same relative motion between the tool and the workpiece.Why are they considered different?
Please suggest a good book to learn about these.
 
Ranger Mike said:
it is good for you to ask questions. it is how we learn.

From a very good machine tool publication-
https://www.practicalmachinist.com/vb/cnc-machining/definition-each-lathe-axis-152203/

On a lathe it is standard for the Longitudinal to be Z and the Radial to be X. Vectors are I and K

The axis parallel to the spindle axis is always Z, whether its a mill or lathe. And, for the lathe, the axis that controls the diameter is always X.

And the Lathe rotary axis conform to the standard of A rotates around X, B around Y, and C around the Z.
C is the most common on a Lathe, as it relatively easy to turn the chuck into a C axis.



your teacher may be referring to the length of the lathe travel. I have sold coordinate measurement machines and these are typically described in length of travel. so see if the lathe can traverse 1.5 meters or 60 inches.
Nice answer.
 
Technically its a 4 axis machine, since the tool can be moved in/out up/down (although rare on newer models) and left/right and the piece can be rotated at different speeds. At least this is how it would be determined in robotics. But what you or your teacher call it is academic, it is what it is whether we call its a 1.5 axis machine or a 4000 axis machine.
 
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Mohankpvk said:
Nice answer.I have another doubt.
In case of mills with more than 6 axes,the tool movement along x and the table movement along x (both have separate actuators) are counted as two different axes.But both these movements produce the same relative motion between the tool and the workpiece.Why are they considered different?
Please suggest a good book to learn about these.
rotating about the x y z axes make up the 4th 5th and 6th axis. it has nothing to do with the tool moving and the table moving.
 

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