ISO programming
G286
G286
Refer to your machine manual.
This function must be enabled and adapted by the machine manufacturer.
With Cycle 286 GEAR HOBBING, you can machine external cylindrical gears or helical gears with any angles. You can select the machining strategy and the machining side in the cycle. The machining process for gear hobbing is performed with a synchronized rotary movement of the tool spindle and workpiece spindle. In addition, the cutter moves along the workpiece in axial direction. Both for roughing and for finishing, the cutting operation may be offset by x edges relative to a height defined at the tool (e.g., 10 cutting edges for a height of 10 mm). This means that all cutting edges will be used in order to increase the tool life of the tool.
Cycle 285 DEFINE GEAR (option 157)
Avoid master spindle speeds of less than 6 rpm. Otherwise, it is not possible to reliably use a feed rate in mm/rev.
Help graphic | Parameter |
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Q215 Machining operation (0/1/2/3)? Define extent of machining: 0: Roughing and finishing 1: Only roughing 2: Only finishing to final dimension 3: Only finishing to oversize Input: 0, 1, 2, 3 | |
Q200 Set-up clearance? Distance for retraction and prepositioning. This value has an incremental effect. Input: 0...99999.9999 or PREDEF | |
Q260 Clearance height? Coordinate in the tool axis in which no collision with the workpiece can occur (for intermediary positioning and retraction at the end of the cycle). This value has an absolute effect. Input: –99999.9999...+99999.9999 or PREDEF | |
Q545 Tool lead angle? Angle of the edges of the gear hob. Enter this value in decimal notation. Example: 0°47'=0.7833 Input: –60...+60 | |
Q546 Reverse spindle rotation dir.? Direction of rotation of the slave spindle: 0: No change in the direction of rotation 1: Change in the direction of rotation Input: 0, 1 Verifying and changing directions of rotation of the spindles | |
Q547 Angle offset of tool spindle? Angle at which the control turns the workpiece at the beginning of the cycle. Input: -180...+180 | |
Q550 Machining side (0=pos./1=neg.)? Define at which side machining is to take place. 0: Positive machining side of the main axis in the I-CS 1: Negative machining side of the main axis in the I-CS Input: 0, 1 | |
Q533 Preferred dir. of incid. angle? Selection of alternate possibilities of inclination. The angle of incidence you define is used by the control to calculate the appropriate positioning of the tilting axes present on your machine. In general, there are always two possible solutions. Via parameter Q533, you configure which solution option the control is to use: 0: Solution that is the shortest distance from the current position -1: Solution that is in the range between 0° and -179.9999° +1: Solution that is in the range between 0° and +180° -2: Solution that is in the range between -90° and -179.9999° +2: Solution that is between +90° and +180° Input: –2, –1, 0, +1, +2 | |
Q530 Inclined machining? Position the tilting axes for inclined machining: 1: Automatically position the tilting axis, and orient the tool tip (MOVE). The relative position between the workpiece and tool remains unchanged. The control performs a compensating movement with the linear axes 2: Automatically position the tilting axis without orienting the tool tip (TURN) Input: 1, 2 | |
Q253 Feed rate for pre-positioning? Definition of the traversing speed of the tool during tilting and during pre-positioning. And during positioning of the tool axis between the individual infeeds. Feed rate is in mm/min. Input: 0...99999.9999 or FMAX, FAUTO, PREDEF | |
Q553 TOOL:L offset, machining start? Define the minimum length offset (L OFFSET) that the tool should have when in use. The control offsets the tool in the longitudinal direction by this amount. This value has an incremental effect. Input: 0...999.999 | |
Q554 Path for synchronous shift? Define by which distance the gear hob will be offset in its axial direction during machining. This way, tool wear can be distributed over this area of the cutting edges. For helical gears, it is thus possible to limit the cutting edges used for machining. Entering 0 deactivates the synchronous shift function. Input: –99...+99.9999 | |
Q548 Tool shift for roughing? Specify the number of cutting edges by which the control will shift the roughing tool in its axial direction. The shift will be performed incrementally relative to parameter Q553. Entering 0 deactivates the shift function. Input: –99...+99 | |
Q463 Maximum cutting depth? Maximum infeed (radius value) in the radial direction. The infeed is distributed evenly to avoid abrasive cuts. Input: 0,001...999.999 | |
Q488 Feed rate for plunging Feed rate for tool infeed. The control interprets the feed rate in mm per workpiece revolution. Input: 0...99999.999 or FAUTO | |
Q478 Roughing feed rate? Feed rate during roughing. The control interprets the feed rate in mm per workpiece revolution. Input: 0...99999.999 or FAUTO | |
Q483 Oversize for diameter? Diameter oversize on the defined contour. This value has an incremental effect. Input: 0...99.999 | |
Q505 Finishing feed rate? Feed rate during finishing. The control interprets the feed rate in mm per workpiece revolution. Input: 0...99999.999 or FAUTO | |
Q549 Tool shift for finishing? Specify the number of cutting edges by which the control will shift the finishing tool in its longitudinal direction. The shift will be performed incrementally relative to parameter Q553. Entering 0 deactivates the shift function. Input: –99...+99 |
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.
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.
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Before performing a machining operation, make sure that the direction of rotation has been set correctly for both spindles.
Machining side | Direction of rotation of the rotary table |
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X+ (Q550=0) | Clockwise (e.g., M303) |
X- (Q550=1) | Counterclockwise (e.g., M304) |
Machining side | Direction of rotation of the rotary table |
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X+ (Q550=0) | Counterclockwise (e.g., M304) |
X- (Q550=1) | Clockwise (e.g., M303) |
Keep in mind that in special cases, the directions of rotation might deviate from the ones indicated in these tables.
Milling:
Turning:
Before performing a machining operation, make sure that the direction of rotation has been set correctly for both spindles.
If required, define a low spindle speed to make sure that the direction of rotation is correct.