Reducing the feed rate for internal radii with M110
Application
With M110 the control maintains a constant feed rate at the cutting edge only for internal radii, as opposed to M109. This results in consistent cutting conditions affecting the tool, which is important, for example, in heavy-duty machining.
Description of function
Effect
M110 takes effect at the start of the block.
In order to reset M110, program M111.
Application example
NC programs contained in this User's Manual are suggestions for solutions. The NC programs or individual NC blocks must be adapted before being used on a machine.
Change the following contents as needed:
- Tools
- Cutting parameters
- Feed rates
- Clearance height or safe position
- Machine-specific positions (e.g., with M91)
- Paths of program calls
Some NC programs depend on the machine kinematics. Adapt these NC programs to your machine kinematics before the first test run.
In addition, test the NC programs using the simulation before the actual program run.
With a program test you determine whether the NC program can be used with the available software options, the active machine kinematics and the current machine configuration.
11 L X+5 Y+25 RL F1000 | ; Approach first contour point at programmed feed rate |
12 CR X+45 Y+25 R+20 DR+ M110 | ; Activate feed rate reduction, then perform the operation on the circular path at the reduced feed rate |
In the first NC block the control moves the tool at the programmed feed rate, which refers to the tool center-point path.
In NC block 12 the control activates M110 and maintains a constant feed rate at the tool cutting edge when machining on internal radii. At the beginning of each block the control calculates the feed rate at the tool cutting edge for the respective NC block and adapts the programmed feed rate depending on the contour radius and tool radius.
The tool then cuts the internal radius at a reduced feed rate.
Without M110 the tool cuts along the internal radius at the programmed feed rate.
Note
If you define M110 before calling a machining cycle with a number greater than 200, the adjusted feed rate is also active for circular paths within these machining cycles.