Cycle 285 DEFINE GEAR (#157 / #4-05-1)

ISO programming

G285

Application

 
Machine

Refer to your machine manual.

This function must be enabled and adapted by the machine manufacturer.

Use Cycle 285 DEFINE GEAR to describe the geometry of the gearing system. To describe the tool, use Cycle 286 GEAR HOBBING or Cycle 287 GEAR SKIVING and the tool table (TOOL.T).

Notes

  • This cycle can be executed only in the FUNCTION MODE MILL and FUNCTION MODE TURN machining modes.
  • This cycle is DEF-active. The values of these Q parameters will only be read when a CALL-active machining cycle is executed. If you overwrite these input parameters after the cycle definition and before calling the machining cycle, the gear geometry will be modified.
  • Define the tool as a milling cutter in the tool table.

Notes on programming

  • You must specify values for module and number of teeth. If the outside diameter (diameter of the addendum circle) and the tooth height are defined as 0, normal running gears (DIN 3960) will be machined. If you want to machine gearing systems that differ from this standard, define the corresponding geometry by specifying the diameter of the addendum circle (outside diameter) Q542 and the tooth height Q563.
  • If the algebraic signs of the two input parameters Q541 and Q542 are contradictory, the cycle will be aborted with an error message.
  • Remember that the diameter of the addendum circle is always greater than the root circle diameter, even for an inner gear.
  • Inner gear example: The outside diameter (addendum circle) is –40 mm, the root circle diameter is –45 mm. Also in this case, the diameter of the addendum circle (outside diameter) is (numerically) greater than the root circle diameter.

Cycle parameters

Help graphic

Parameter

Q551 Starting point in Z?

Starting point of the hobbing process in Z

Input: –99999.9999...+99999.9999

Q552 End point in Z?

End point of the hobbing process in Z

Input: –99999.9999...+99999.9999

Q540 Module?

Module of the gear

Input: 0...99.999

Q541 Number of teeth?

Number of teeth. This parameter depends on Q542.

+: If the number of teeth is positive, and at the same time the parameter Q542 is positive, then an external gear will be machined.

-: If the number of teeth is negative, and at the same time the parameter Q542 is negative, then an internal gear will be machined.

Input: –99999...+99999

Q542 Outside diameter?

Addendum circle (outside diameter) of the gear. This parameter depends on Q541.

+: If the addendum circle is positive, and at the same time the parameter Q541 is positive, then an external gear will be machined.

: If the addendum circle is negative, and at the same time the parameter Q541 is negative, then an internal gear will be machined.

Input: –9999.9999...+9999.9999

Q563 Tooth height?

Distance from the tooth trough to the tooth tip.

Input: 0...999.999

Q543 Trough-to-tip clearance?

Distance between the addendum circle of the gear to be made and root circle of the mating gear.

Input: 0...9.9999

Q544 Angle of inclination?

Angle at which the teeth of a helical gear are inclined relative to the direction of the axis. For straight-cut gears, this angle is 0°.

Input: –60...+60

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.

 
Tip

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.

Example

11 CYCL DEF 285 DEFINE GEAR ~

Q551=+0

;STARTING POINT IN Z ~

Q552=-10

;END POINT IN Z ~

Q540=+1

;MODULE ~

Q541=+10

;NUMBER OF TEETH ~

Q542=+0

;OUTSIDE DIAMETER ~

Q563=+0

;TOOTH HEIGHT ~

Q543=+0.17

;TROUGH-TIP CLEARANCE ~

Q544=+0

;ANGLE OF INCLINATION