HEIDENHAIN TNC 426 (280 476) Pilot - Manual (Page 72)

73
SL
Cycles
CYLINDER SURFACE (27)
This cycle requires a center-cut end mill (ISO 1641)!
Cycle 27 CYLINDER SURFACE enables you to program a cylindrical
contour in only two axes, as if in a plane. The TNC then rolls it onto a
cylindrical surface.
Define a contour in a subprogram and list it in Cycle 14 CONTOUR
GEOMETRY
CYCL DEF: Select Cycle 27 CYLINDER SURFACE
Milling depth Q1
Finishing allowance for side Q3: Enter the finishing allowance
(Either Q3>0 or Q3<0)
Set-up clearance ? Q6: Distance from the tool to the workpiece
Plunging depth Q10
Feed rate for plunging Q11
Feed rate for milling Q12
Cylinder radius Q16: Radius of the cylinder
Dimension type? Deg=0 mm/inch=1 Q17: You can enter
coordinates in the subprogram in degrees or millimeters
The machine and TNC must be prepared for the CYLINDER
SURFACE cycle by the machine tool builder!
• The workpiece must be set up concentrically on the rotary
table!
• The tool axis must be perpendicular to the axis of the rotary
table!
• Cycle 14 CONTOUR GEOMETRY can have only one label
number!
• A subprogram can hold no more than 128 line segments!
The unrolled contour