HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 196)

196 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing,
T
apping and Thr
ead Milling
8 Set-up clearance Q200 (incremental value): Distance
between tool lower edge and workpiece surface.
8 Depth Q201 (incremental value): Distance between
workpiece surface and bottom of hole.
8 Feed rate for plunging Q206: Traversing speed of
the tool during helical drilling in mm/min.
8 Infeed per helix Q334 (incremental value): Depth of
the tool plunge with each helix (=360°).
8 Workpiece surface coordinate Q203 (absolute
value): Coordinate of the workpiece surface.
8 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
8 Nominal diameter Q335 (absolute value): Bore-hole
diameter. If you have entered the nominal diameter to
be the same as the tool diameter, the TNC will bore
directly to the entered depth without any helical
interpolation.
8 Roughing diameter Q342 (absolute value): As soon as
you enter a value greater than 0 in Q342, the TNC no
longer checks the ratio between the nominal
diameter and the tool diameter. This allows you to
rough-mill holes whose diameter is more than twice
as large as the tool diameter.
Example: NC blocks
12 CYCL DEF 208 BORE MILLING
Q200=2 ;SET-UP CLEARANCE
Q201=-80 ;DEPTH
Q206=150 ;FEED RATE FOR PLUNGING
Q334=1.5 ;PLUNGING DEPTH
Q203=+100 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
Q335=25 ;NOMINAL DIAMETER
Q342=0 ;ROUGHING DIAMETER
Note that if the infeed distance is too large, the tool or the
workpiece may be damaged.
To prevent the infeeds from being too large, enter the
maximum plunge angle of the tool in the ANGLE column
of the tool table, (
’FF˜‰ppd˜ "›"Š:˜z"VF˜nG). The TNC then
automatically calculates the max. infeed permitted and
changes your entered value accordingly.