Lathe post names use letters to signify their capabilities. The designation may be a single letter or multiple letters to specify the post's capability. Following the letter designation is a unique number for this post.
The general format of a post can be described as :
Note that a metric post will end with a lower case m
Following is a description of how Lathe Posts are named and what they do. Also included are brief explanations of code issues that might be encountered in Lathe Posts.
1. L This designates a regular 2-axis turning post. A Lathe post has 2 linear axes (X and Z) that can position and cut simultaneously.
Fanuc 16T [VG] L800.18.pst
1. Tool Tip
- The system draws the toolpath to the center of the tool tip radius. The X and Z-axis values are output to the theoretical tool tip if the system is able to calculate a touch-off point in both axes. X or Z-axis values are output to the center of the tool tip radius when the software is not able to calculate the touch-off point in that particular axis.
- If the tool is machining parallel to the Z-axis, the X values are output to blueprint dimensions. If the tool is machining parallel to the X-axis, the Z values are output to blueprint dimensions. So, the theoretical tool tip only aligns with blueprint dimensions on faces and diameters.
- When the tool is machining at an angle, the X and Z-axis values will not match the blueprint dimensions. This is because the theoretical tool tip is not always a blueprint dimension. So, in order for the system to get the surface of the tool in position to cut the part, the theoretical tool tip is calculated closer to the part, and in some cases inside the part.
- Most Lathe Posts output X and Z values to the theoretical tool tip. Posts can be modified to output X and Z values to the center of the tool tip radius.
2. Canned Cycles
- Lathe canned cycles are output when the Prefer Canned checkbox is checked. This checkbox will only be available if Auto Clearance and Material only are not selected. If Auto Clearance and/or Material Only are selected, the system will not output Canned Cycles.
3 & 4-Axis Mill/Turn
A Mill/Turn post supports both milling and turning operations in the same part. A 2-axis lathe post is no longer needed if a Mill/Turn post is available.
- ML - This designates a Mill/Turn post.
- S - This designates a Mill/Turn post that segments rotary arcs into linear moves.
Example: Fanuc 16T [VG] SML800.19.pst
- I - This designates a Mill/Turn post that supports Polar and Cylindrical Interpolation. A Polar and Cylindrical Interpolation Mill/Turn post will output a G2 or G3 with rotary moves.
Example: Fanuc 16T [VG] IML800.19.pst
- Y - This designation is for a 4-axis Mill/Turn machine that has a linear Y-axis.
Fanuc 16T [VG] YIML800.19.pst
Fanuc 16T [VG] YSML800.19.pst
- P - This designates a C-axis positioning post. A Mill/Turn positioning post will rotate the part and then move in X and Z. It will not rotate and cut simultaneously.
Example: Fanuc 16T [VG] PML800.19.pst
- N - This designates a Mill/Turn post that does not use subprograms. This is known as a "Long Hand post". Subprograms are frequently used for multi-process drilling, C-repeat drilling, Z-repeat milling, C-repeat milling, Patterns (OD only), etcetera.
Fanuc 16T [VG] NSML800.19.pst
Fanuc 16T [VG] NIML800.19.pst
- B - This designates a B-axis rotation post. This supports the creation of coordinate systems that has the tool rotate about the B-axis.
Super Hicell 250 HS [JMC] BSML1082.19.7.pst
1. Tool Orientation
- When using a mill tool on the Face or OD, it is important to define the orientation of that tool correctly. When Milling or Drilling on the face, make sure the orientation of the tool is perpendicular to the face. When Milling or Drilling on the OD, make sure the orientation of the tool is perpendicular the OD. If the tool is not oriented properly, the output will not be correct.
2. C-Axis And Y-Axis Output
- The radio buttons Position and Rotary Milling in the Rotate Tab determine whether C-axis moves or Y-axis moves are output during Rotary Mill operations. If the position radio button is selected, the system calculates Y-axis moves. If the Rotary Milling radio button is selected, the system calculates C-axis moves.
- If your machine does not have a Y-axis, then you need to select the Rotary Milling radio button.
- If your machine has a Y-axis, this capability can be added to any Mill/Turn post.
3. Rotary Feedrates
- Most rotary feedrates are calculated in Degrees Per Minute per rotary segment based on its length. Since the length of each segment is variable, the system outputs a different feedrate for each segment. The resulting rotary feedrate can be a large value based on the Degrees Per Minute calculation.
- Certain CNCs, such as Haas and Mazak, calculate rotary feedrates using Inverse Time. Any Mill/Turn post can be modified to use Inverse Time for feedrates.
- Polar Interpolation posts use inches per minute for rotary feedrate calculations. Any Mill/Turn post can be modified to use Polar Interpolation with inches per minute feedrates.