HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 74)

74 smart.Turn units
2.3 Units—Recessing
"Undercutting (H, K, U)" unit
Depending on KG, the unit machines one of the following undercuts:
 Form U: The unit machines an undercut and finishes the adjoining
plane surface. Either a chamfer or a rounding arc can be machined.
 Form H: The end point of the undercut is determined from the
plunging angle.
 Form K. Only one linear cut at an angle of 45° is performed. The
resulting contour geometry therefore depends on the tool that is
used.
Unit name: G85x_H_K_U / Cycle: G85 (see page 304)
Access to the technology database:
 Machining operation: Finishing
 Affected parameters: F, S
 First, you select the Type of undercut KG, and then you
enter the values for the selected type of undercut.
 The control changes parameters with the same address
letters for the other undercuts as well. Do not change
these values.
Contour form
KG
Type of undercut
 Form U: Cycle G856 (see page 309)
 Form H: Cycle G857 (see page 310)
 Form K: Cycle G858 (see page 311)
X1, Z1 Contour corner point (X: diameter value)
Undercut type U
X2
End point, face (diameter value)
I Undercut diameter
K Undercut length
B Chamfer/rounding
 B>0: Radius of rounding
 B<0: Section length of chamfer
Undercut type H
K
Undercut length
R Radius in the undercut corner
W Plunging angle
Undercut type K
I
Undercut depth (radius)
Further forms: see page 56