AI USE CASE
CNC Toolpath Collision Pre-Check
Simulate NC programs against fixture geometry to catch collisions before any metal is cut.
What it is
This use case runs the NC program through a digital simulation of the machine, stock, and fixturing to flag collisions, near-misses, and rapid moves into material before the spindle ever moves. Small CNC shops typically see one to three spindle crashes per month, each costing €500–€3,000 in tooling, downtime, and scrap; automated pre-check eliminates the majority of these incidents within weeks of deployment. Setup times per job drop by 20–40% because programmers catch errors at the desk rather than on the machine. Teams with no dedicated CAM simulation licence can access this capability via affordable SaaS tools requiring only the NC file and a basic fixture model.
Data you need
NC program files (G-code or equivalent), basic 3D models or dimensions of fixtures and stock material.
Required systems
- none
Why it works
- Integrate the pre-check as a mandatory gate in the job release workflow so no program reaches the floor unverified.
- Maintain an accurate, up-to-date library of tool holders, fixtures, and machine kinematic models.
- Track every avoided crash and share the cost savings with the team to build buy-in.
- Start with a single machine and a standard fixture set to build confidence before rolling out shop-wide.
How this goes wrong
- Fixture and stock models are not kept up to date, causing the simulation to miss real-world geometry changes.
- Machinists bypass the pre-check under time pressure, especially for repeat jobs assumed to be safe.
- Machine kinematics are not correctly configured in the simulator, producing false negatives on multi-axis moves.
- Tool library entries are inaccurate (wrong holder or stick-out), leading to missed collision scenarios.
When NOT to do this
Don't invest in collision simulation if the shop runs only one or two simple 3-axis programs on a single machine with a fixed fixture — manual DNC review is faster and cheaper at that scale.
Vendors to consider
Sources
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