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Access the active CYCLE950 call in the NC program and verify Q-parameter assignments. Check Q1 (Xmin), Q2 (Xmax), Q3 (Ymin), Q4 (Ymax) against actual blank dimensions. Compare programmed contour limits with workpiece drawings.

Ensure values are in active workpiece coordinate system (WCS), not machine coordinates.

In SINUMERIK 840D Shop Floor Programming (SFP), navigate to Cycles > CYCLE950 parameter editor and re-enter blank contour geometry. Verify contour type selection: rectangular blank vs. contour pocket geometry definition.

Cross-reference Machine Data MD18200 (tool radius compensation mode) and MD20050 (contour offset direction) to confirm contour offset calculations are bidirectional and account for tool geometry during finishing pass.

Re-simulate program execution in SINUMERIK Operate menu: select 'Program' > 'Simulation' > verify the generated tool path does not extend beyond the blank contour display on the workpiece model.

Verify active workpiece offset in the NC program. Check G-code offset selection (e.g., G54) and confirm the offset values in 'Offset Management' menu match the physical machine setup measurement. Measure actual workpiece zero using a probe cycle (CYCLE4 or equivalent).

Use SINUMERIK Operate > 'Offsets' > 'Geometry Offsets' to inspect stored values; do not rely on manual notes.

In MDI mode, execute a manual tool position check: G65 P9832 A0 B0 to probe workpiece datum, then compare reported position to programmed offset origin. If discrepancy exceeds tool radius, update offset in 'Offset Management' and re-run CYCLE950.

Check for stacked offsets: confirm no additional offsets (MD20050, fixture offsets, or DynamicG-code offsets) are active during CYCLE950 execution. Use 'Diagnostics' > 'Offset Display' (SINUMERIK 840D) to view active offset stack.

In SINUMERIK Operate, navigate to 'Offsets' > 'Tool Table' and locate the tool assigned to CYCLE950 (typically T-number referenced in the cycle call). Verify the 'Radius' field matches the physical cutting tool measurement (calipers or tool pre-setter measurement).

Ensure tool radius is entered as actual radius value, not diameter. Common error: entering diameter instead of radius causes 2x offset error.

Confirm CRC activation mode: check if 'G41' (left offset) or 'G42' (right offset) is active in the NC program or if CYCLE950 handles CRC internally. Cross-reference MD20050 (contour offset direction setting) to verify compatibility with programmed geometry approach direction.

Create a test program: disable CYCLE950, manually program a simple rectangular finishing pass with explicit G-code contour. Execute with current tool and measure actual tool path offset. Compare to programmed tool radius to identify compensation error magnitude.