Get With The Program: Maximizing spindle time

CNC machine tools only generate revenue when they are producing good parts. The more good parts they make, the quicker the return on investment for machine tools. To maximize output, the total per-part machining time, including preparation, must be minimized.

The five keys to achieving that are to:

1. Optimize the production schedule.
2. Use efficient NC programs that minimize cycle time.
3. Minimize setup time for fixtures, blanks and cutting tools.
4. Eliminate production-preparation delays.
5. Speed up tool and part changes on machines.

WinTool is a single-source CNC master database for manufacturing data. Image courtesy WinTool.

Depending on the type of production method used, the significance of these five factors differ. For example, a large-volume manufacturer will typically focus on automation efforts and toolpath optimization using efficient NC programs, while a job shop will most likely focus on minimizing machine tool setup and optimizing operation procedures.

Automation can be achieved relatively easily by investing in robots, tool magazines, and tool and part changers. These investments are easily justifiable, and, in general, simultaneously improve throughput and part cost and quality.

On the other hand, improvements are much harder to achieve when preparing a machine for a job, programming parts, and supplying production resources and tools. This is because many people with various levels of expertise, along with multiple departments, are interdependent upon one another to run a production job. Each part runs through a long workflow, which includes employees from R&D, production planning and resources, programming, purchasing, and tool storage, presetting, machining, QC and shipping.

The challenge is that most departments are working with different systems introduced over the last 20 years. These include software—Microsoft Office, enterprise resource planning (ERP), product lifecycle management (PLM), CAD/CAM and simulation—as well as presetting gages, vending machines, storage lifts and machine controls. In addition, suppliers are flooding the market with webstores, apps and cloud-based offerings that are frequently added to the mix.

Not only have the number of different systems increased, but the data volume used in production has increased exponentially in the last few years. In addition, virtual machining requires not only organizing and maintaining a real production shop, but also maintaining an exact replica of it in the digital domain.

So it is no surprise that production resources and tools data management have become the bottleneck at many CNC shops. To break this data-processing logjam, many companies heavily invest in new IT systems and automation. These investments do not eliminate the problems. On the contrary, this approach often makes the problems worse by introducing more nonintegrated systems.