Code 10768: [Channel %1: ] Block %2 illegal tool orientation with 3D tool radius compensation
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 illegal tool orientation with 3D tool radius compensation alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Parameters: %1 = Channel number %2 = Block number, label Definitions: This alarm may occur during 3D face milling: the angle between the surface normal vector of the surface to be machined and the largest surface normal ve ctor of the tool surface is smaller than the limit value given by MD21080 $MC_CUTCOM_PARALLEL_ORI_LI MIT, or the tool is oriented such that machining would have to be performed from the rear side of the surface. In this case, the largest surface normal vector is the vector the direction of whic h deviates most from the direction in the tool point (i.e. parallel to the tool longitudinal axis). With cylindrical tools or tools whic h end in a cylindrical part (e.g. the standard torus milling cutter), this vector is positioned perpendicular to the tool vector. For this type of tool, the alarm indicates that the angle between the tool longitudinal axis of, for example an envelope line of the cylinder, and the surface to be machined is smaller than the minimum per missible value. With tools the (valid) surface of which ends in a conical part instead of a cylindrical part (e.g. a beveled cutter or a torus milling cutter where the torus is defined to be smaller than 90 degr ees), this alarm indicates that the angle between an envelope line of the taper and the surface to be ma chined is smaller than the minimum permissible value. Reaction: Correction block is reorganized. Local alarm reaction. Interface signals are set. Alarm display. NC Stop on alarm at block end. Remedy: Modify part program. If necessary, use another tool. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 10768 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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