KOREA VIDEO REVIEW · COLLISION SHIELD
The Machine Hits Its Own Brakes: A Video Review of DN Solutions' Collision Prevention System (CPS)
01What this official video is about
The official video DN Solutions made for its collision prevention system (CPS, 충돌 방지 시스템) puts its pitch right in the title: "Let the machine automatically protect itself from crashing!"[1]
The official description is clear: CPS is software that, on five-axis or multi-tasking machines, "automatically halts machining when it predicts a collision"; it supports both automatic mode and manual mode; and its slogan is "save time and cost, freed from stress"[1]. Another technical video from the Korea Institute of Machinery & Materials (KIMM) shows that environment-aware, collision-avoidance control for working machines is also a focus area of Korea's national research system[2]—with industry and research both working on it, you can see how real this need is.
02How CPS works: real-time prediction on the machine
The principle of on-machine collision avoidance is that the controller has a built-in 3D model of the machine, fixtures, tools, and workpiece, and computes ahead in the instant before each move executes: will the upcoming motion make any two objects collide? If so, it stops before contact happens[1].
Two details determine its value:
- Five-axis and mill-turn machines are the main battlefield: rotary axes cause an explosion of relative poses among the tool, spindle head, and table that the human brain and eye can't keep up with—these are exactly the machine types with the highest collision risk and the greatest need for the machine to protect itself[3].
- Manual-mode support is the highlight: statistically, a large share of crashes happen during touch-off, MDI, and handwheel moves—the moments a person is "operating the machine directly"—and no matter how perfect the program is, it can't prevent a slip of the hand. By extending the line of defense to manual operation, CPS fills exactly this gap[1].
03Two lines of defense: off-machine simulation × on-machine collision avoidance
Place CPS inside a complete crash-prevention architecture and it is the second line of defense, not the only one:
| First: off-machine cutting simulation | Second: on-machine real-time collision avoidance (CPS) | |
|---|---|---|
| Timing | Programming stage, before the machine | Instant of execution, before contact |
| What it intercepts | Toolpath errors, gouges, interference—problems in the program itself | Fixture shifts, manual slips, on-the-floor situations outside the simulation |
| Cost | Virtual computation, zero machine-time loss | An emergency stop still costs cycle time, and parameters need upkeep |
| Theory | Virtual process verification[4] | Real-time collision detection and control |
The relationship is complementary, not substitutive: relying only on on-machine collision avoidance means letting bad programs slam on the brakes every day—it stops, but you've still lost cycle time and confidence; relying only on off-machine simulation can't stop the on-the-floor variables outside the model. The first line eliminates "foreseeable collisions" in the virtual world, and the second guards against "unforeseeable accidents"—for the complete architecture, see The CNC Crash Prevention Guide.
04The adoption sequence for a Taiwanese shop
For a Taiwanese shop, the action translation of this video splits by machine type and sequence:
- Shops with five-axis/mill-turn machines: on-machine collision avoidance is worth serious evaluation (every major controller has a corresponding solution)—the cost of a single crash on these machines often exceeds the software license itself.
- Every shop: first make the first line of defense part of daily routine—run cutting simulation on every program before it goes on the machine. This step has the lowest cost and the greatest interception volume, and it's an inevitable companion of the AI code-generation era: BestAI CAM builds 3D cutting simulation and independent AI dimensional cross-verification in as a mandatory checkpoint in the code-generation flow, reviewable move by move right in the browser (see The Complete Guide to CNC Automated Programming).
- Sequencing principle: virtual before physical—the more solid the first line of defense, the less the second gets triggered; a CPS emergency stop should be a rare event, not a daily sight.
05FAQ
Are an on-machine collision prevention system (CPS) and cutting simulation redundant investments?
They're not redundant—they're two complementary lines of defense. Cutting simulation intercepts toolpath errors, gouges, and interference at the programming stage (at zero machine-time cost); on-machine collision avoidance intercepts fixture shifts, manual-operation slips, and other on-the-floor situations the simulation didn't foresee, at the instant of execution. Relying only on the latter means letting bad programs slam on the brakes every day; relying only on the former can't prevent accidents during manual moments.
Why do five-axis and mill-turn machines especially need a collision prevention system?
Rotary axes cause an explosion of relative poses among the tool, spindle head, table, and tailstock, making the collision risk far higher than on three-axis machines and hard for a person to foresee from experience. These machines are also high-value, and a single crash means large repair and downtime losses—the official video positions CPS on five-axis and multi-tasking machines precisely to target the highest-risk scenarios.
When do most crashes happen?
Beyond program errors, a large share of accidents happen during manual operation: touch-off, MDI, and handwheel moves—the interval that program verification can't protect. That's why CPS "supporting manual mode too" is a practical highlight. Complete prevention is three layers: simulation verification at the programming stage, on-machine protection during manual moments, plus a standardized touch-off and coordinate-system workflow.
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FIRST LINE OF DEFENSE
Build the first line of defense first: simulate every program before it hits the machine
AI code generation + built-in 3D cutting simulation + dimensional cross-verification—so that on-machine collision avoidance becomes rare insurance rather than a daily brake.
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06References
- DN Solutions_Official (YouTube). CPS (충돌 방지 시스템) – 머신이 충돌하지 않도록 자동 보호하세요! (published 2024-11-06). youtube.com/watch?v=sYHrjOmV9zU
- 한국기계연구원 KIMM (YouTube). 작업기계의 환경인지 및 충돌방지 안전 제어 기술. youtube.com/watch?v=Y1uHPHSW7jw
- Altintas, Y. (2012). Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design (2nd ed.). Cambridge University Press.
- Altintas, Y., Kersting, P., Biermann, D., Budak, E., Denkena, B., & Lazoglu, I. (2014). Virtual process systems for part machining operations. CIRP Annals, 63(2), 585–605.