1A0-0089

Access preset table

Press MOD key, select 'Preset table' from the menu, or access via 'Tables' softkey then 'Preset table'. Review all entries for the active preset number being called by your program.

The active preset is shown in the position display - check which row number is highlighted in yellow or has an active marker.

Check spatial angle values

Review SPA (spatial A), SPB (spatial B), and SPC (spatial C) columns. Look for SPB values approaching ±90° or unusual combinations like SPA=45°, SPB=90°, SPC=45° which can create undefined transformation states.

Do not modify preset values while a program is running or a transformation is active - always reset first.

Test with simplified transformation

Temporarily set all spatial angles to 0.0 and test if the base transformation activates. If successful, incrementally add back one rotation axis at a time to identify the problematic combination.

For most 3+2 operations, use only SPB and SPC (or machine-specific rotary angles) - avoid triple rotation unless absolutely required.

Verify against machine kinematics

Access MOD > Machine Parameters > Kinematics and verify the defined machine structure (CfgAxisSeq, CfgRotAxes). The base transformation must align with the machine's physical rotary axis configuration.

On 5-axis machines, the transformation sequence matters - swivel head machines use different kinematics than table rotary machines.

Check for active PLANE function

Review your NC program for PLANE SPATIAL, PLANE PROJECTED, or older Cycle 19 WORKING PLANE commands. Check the additional status display (press Status key multiple times) to see if a tilted working plane is active.

The status display shows 'PLANE' in the transformation section when a tilted working plane is active - this is independent of preset transformations.

Deactivate PLANE function

Insert PLANE RESET or M134 in MDI mode to cancel any active working plane. Then attempt to activate your base transformation separately to isolate the conflict.

PLANE RESET affects tool orientation - ensure machine is clear of workpiece before executing.

Use proper transformation hierarchy

On Heidenhain controls, apply base transformation first (via preset or Cycle 7), then apply tilted working plane if needed. Do not embed conflicting spatial rotations in both systems.

Best practice: Use preset table for fixture offsets and basic rotations; use PLANE functions only for feature-specific tilting within that coordinate system.

Review M114/M128 modal state

Check if M114 (automatic preset calculation) or M128 (maintain position during preset change) is active. These can create transformation conflicts when combined with spatial rotations.

M128 is particularly problematic with rotary axes - the control may be attempting to maintain TCP while applying incompatible transformations.

Export and inspect preset table

From preset table screen, use 'Save as' softkey to export the current table to a .PRT file. Open this file in TNCdiag or text editor to check for non-numeric characters, excessive decimal places, or scientific notation in transformation columns.

Valid Heidenhain preset files use specific formatting - look for values beyond ±999999.9999 or entries like '1.#INF' which indicate corruption.

Clear problematic preset row

Highlight the suspect preset row, use 'Edit' softkey, then manually set all transformation values (X, Y, Z, SPA, SPB, SPC) to 0.0. Save and attempt activation.

Record original values before clearing - photograph the screen or write down all parameters for reference.