Defining Multi-Angle Cutting Tools in Siemens NX CAM

Overview: Tool Definition in Siemens NX CAM

Siemens NX CAM exposes multiple tool-definition paths so that programmers can match cutter geometry to the manufactured part. The two paths most relevant to complex, multi-angle flank tools are the 10-Parameter Tool (the standard library record supporting diameter, corner radius, taper angle, and a fixed set of geometric descriptors) and the User-Defined Tool (UDT) record that lives under Planar Profile and turning-mill operations. Each path has hard limits: the 10-Parameter record cannot express two consecutive tapered flanks, and the UDT record cannot always reproduce the non-cutting holder geometry that downstream cutter-path simulation expects.

This reference documents the constraints, the available mitigations inside Siemens Digital Industries Software Support, and a step-by-step construction of an asymmetric multi-angle tool (a flat land at center, a 10° flank, and a steeper 70° / 100° flank) that is required for facing cuts where residual stock remains trapped in internal corners.

Tool Geometry Model and Naming Conventions

NX CAM tool records follow the conceptual hierarchy: Cutter (cutting portion) -> Holder (non-cutting shank, optionally with geometry files) -> Adapter (machine-side mounting). Each is stored in the Tool Library as a .tld entry and consumed by operations through USE_TOOL or by name in MCS references.

Tool Types and Where They Apply

The following table maps tool record types to NX CAM operation categories. Tool type determines which operation dialogs accept the record without validation errors.

The Multi-Angle Flank Problem (TYP1 / TYP2)

Two real cutter shapes frequently requested for facing and shoulder cuts cannot be expressed by the 10-Parameter record:

Both types share the requirement of a flat land between two distinct taper angles. This is geometrically a three-segment profile along the radial axis:

r(z) = { r0                     if 0 <= z < h0   (straight land)
         r0 + (z - h0) * tan(10°) if h0 <= z < h1
         r0 + (h1-h0)*tan(10°) + (z-h1) * tan(70°) if h1 <= z < h2 }

The 10-Parameter Tool stores a single TAPER_ANGLE and therefore can only realize the first two segments. To produce all three, a User-Defined Tool record is required.

Construction Procedure: User-Defined Tool with Multi-Segment Profile

Prerequisites

1. Siemens NX 1980 or later (UDT block UI improvements; older NX 5/6/NX 12 still supported with NX Manufacturing Documentation).
2. An active CAM setup with a Workpiece Coordinate System (MCS) and a part file containing the receiving pocket.
3. Tool Library writable to the local user database ($(UGII_BASE_DIR)\_library\ or custom .tld).
4. Optional: a 3D model of the cutter (.prt) for graphical tool path simulation.

Step 1: Create the Cutter Profile in Part Modeling

1. Open Menu -> Insert -> Curve -> Line.
2. Sketch the three-segment radial profile in the XZ plane using the dimensions from your engineering drawing. For TYP1 with center straight land at Ø 20 mm, taper Ø 18.0 at z = 5 mm, taper Ø 16.0 at z = 10 mm:

Segment 1: P0(10,0)   -> P1(10,5)
Segment 2: P1(10,5)   -> P2(9,10)      # 10° taper (length 5 mm, drop 1 mm)
Segment 3: P2(9,10)   -> P3(8.0,16.21) # 70° taper (length 6.21 mm, drop 1 mm)

3. Rotate the profile 360° about the tool axis using Revolved Feature to obtain the solid cutter body.
4. Save the part as tool_typ1.prt in your CAM resources directory.

Step 2: Register the Tool in the Library

1. In the Operation Navigator, right-click Tool Library -> New Tool -> User Defined.
2. Set NAME = TYP1_FACE_MILL, TYPE = Mill-Multi-Axis (or Mill-Profile for Planar Profile).
3. Set DIAMETER = 20 (the maximum cutting diameter, used by stock recognition).
4. Set CORNER_RADIUS = 0 (form tool, not a ball end).
5. Set NUMBER_OF_TEETH = 4.
6. Set FLUTE_LENGTH = 16.21 (sum of all three segments).
7. Under Holder, assign the .prt file created in Step 1 as the cutting representation.

Step 3: Apply to a Planar Profile Operation

1. Open Create Operation -> mill_planar -> PLANAR_PROFILE.
2. On the Tool page, click Select and pick TYP1_FACE_MILL.
3. On the Geometry page, define the floor face and the part-silhouette chains.
4. On the Strategy page, enable Rest Material Reference and point it to a previous coarser cavity operation so the multi-angle flank cleans only what the cylindrical tool left behind.
5. Generate the tool path. Verify with Tool Path Simulation -> 3D Dynamic; the cutter graphics should rotate and show the two-flank profile engaged at the floor.

Rest Material Detection in Corners

The Planar Profile operation can output a Rest Material drive curve automatically when a previous operation leaves stock. To expose this:

1. Operation -> Action -> Rest Material -> Generate.
2. The IPW (In-Process Workpiece) is recalculated against the previous operation's cutter.
3. Use Tool Path Visualization -> 2D to confirm the residual islands (typically the sharp 70° corner of the pocket) are picked up.

Turning-Mill Application (Cross-Module Reuse)

The UDT record created under Planar Profile is portable to Turning operations, where it is used for off-center drilling (eccentric boring). To reuse:

1. Open Turning -> User Defined Tool dialog.
2. Click Browse and select the .udt file or library entry created earlier.
3. Map the tool axis to the spindle C-axis using Tool Orientation -> Z follows spindle.
4. Set INSERT_OFFSET_X and INSERT_OFFSET_Z for off-center positioning.
5. Verify clearance moves with Tool Path Backplot -> Collision Check.

Holder Modeling and Post-Processor Compatibility

A common pain point is that NX CAM tool-holder geometry is not consumed by every post-processor. To ensure post output reflects the holder:

To activate holder output in PB posts, add the following UDE in the Start of Path event:

MOM_output_tool_holder &holder_descript$
MOM_output_text " (HOLDER=" $mom_tool_holder_geometry_name $ ")"

Troubleshooting Matrix

Verification Checklist

1. Tool record appears in Operation Navigator tree under the operation.
2. 3D tool path backplot shows the multi-segment profile engaging the floor at the correct z-heights.
3. Rest Material icon in the operation is enabled and IPW shows residual islands at the steep 70° corners.
4. Generated CL file contains a multi-line TAPER block (custom UDE) or the post-processor emits the holder reference.
5. On-machine dry-run confirms the spindle sees the correct non-zero G43 H## offset for the TYP1 tool and that the change clears the fixture envelope.

Standards and Reference Reading

• ISO 13399: Cutting tool data representation and interchange — defines the property identifiers that NX CAM Tool Library fields mirror (CUTDIA, REACH, TAPER).
• ISO 6983 (G-code) reference for post-processor compatibility — relevant when verifying multi-segment taper output on controllers that only honor a single G51 taper.