HEIDENHAIN CNC Pilot 4290 - Manual (Page 378)

7 Parameters 366
7.5 Mac
hining P
a
ra
met
ers
Recessing, contour recessing – Tool selection, allowances
If a recess base machined with a contour-recessing cycle does not
contain paraxial elements but only linear elements, a suitable tool is
selected using the ”recessing width divisor SBD.”
■ Recessing width divisor [SBD]
SB <= b / SBD (SB: width of recessing tool; b: width of machining
area)
■ Type of allowance [KSAA]– The recessing area to be machined can
be assigned allowances. When allowances have been defined, a
recess is first rough-machined and then finish-machined. Entry:
■ 16: Different longitudinal/transverse allowances - individual
allowances are not considered.
■ 144: Different longitudinal/transverse allowances - individual
allowances are considered.
■ 32: Equidistant allowance – individual allowances are not
considered.
■ 160: Equidistant allowance - individual allowances are
considered.
■ Equidistant or longitudinal [KSLA]: Equidistant allowance or
longitudinal allowance
■ None or transverse [KSPA]: Transverse allowance
■ The allowances are accounted for when machining
contour valleys with a contour-recessing operation.
■ Standardized recesses such as recess types D, S, A are
completed in one machining cycle. A division into rough-
machining and finish-machining is only possible in DIN
PLUS.
Recessing, contour recessing – Machining
Evaluation: DIN PLUS
■ Recessing width factor [SBF] – for determining the maximum
offset during recessing cycles (G860, G866).
The following applies: esb = SBF * SB (esb: effective recessing
width (offset); SB: width of recessing tool)
7 – Thread cutting
Thread cutting - Traverse from/to tool change position
■ Approach - external thread [ANGA]
■ Approach - internal thread [ANGI]
■ Depart - external thread [ABGA]
■ Depart - internal thread [ABGI]
Entries for retracting a tool:
■ 1: Simultaneous, X and Z direction
■ 2: First X direction, then Z
■ 3: First Z direction, then X
■ 6: Coupled motion, first X, then Z
■ 7: Coupled motion, first Z, then X
Approach and departure are in rapid traverse (G0).