Tips for Bringing Models Into CAS Software

As the availability of experienced operators decreases, the need to improve machine safety increases. On Okuma CNC machines there is the Collision Avoidance System (CAS) function to help in this matter. This functionality is possible in all modes of operation - Manual, Auto and MDI. The machine as delivered has the as-built machine model supplied for the software and the in-process parts. Tools, holders and workholding, need to be added. Following are some key tips for setting up the user defined data.

Key Points for Model Creation

• The basic need is to import a 3D model to the machine in the STL file format as a single entity shape of 3000 triangles (the OSP-P300 allows 99,000). The capability continues to improve, but the smaller the STL files created, the better for the overall functionality of the system. Items for importing are tool holders, lathe tools, parts and workholding (jaws, chucks, fixtures). Your Okuma distributor has a library of tools available to help get the process started.
• An STL export parameter to set is to “Not transform the Zero point to the Positive quadrant”
• For verification of models there is software, STL Checker Lite, that can be obtained from your local distributor.

Tooling

• A tool assembly can comprise 3 distinct items- 1 cutting tool, 1 holder, and 1 sleeve or holder. At this time milling tools cannot be imported.
• Models for these can be obtained from the various tooling vendors. Through the modeling software of choice, simplify the model to 1 entity and the fewest triangles.

Lathe Tools

• The zero point needs to be moved to the cutting or offset location of the insert.
• Import the tool holder only, do not include the insert.
• The Z+-axis will point to the shank (or right) of the tool.
• The X+-axis is dependent on the Insert facing up (towards user).

Tool Holders

• The Zero point needs to be the shank connection location.
• The Z+-axis will point to the shank (or right) of the tool.
• The X+-axis will point up (or vertical).

Part Models

• Complex shapes will need to be modified to simpler shape with less STL triangles.
• The Zero point should be located and oriented the same as the Part program location.
• For a Lathe, X-Y should be part/spindle centerline.

Workholding

• The Zero point should be located and oriented to mount to the machine surface.
• For a Lathe Chuck or Jaws, X-Y should be fixture/spindle centerline.

These are some quick tips to help with bringing models into the CAS software. Another tool is 3D Virtual Monitor, a PC-based verification software. This can help check programs as well as allow working at a desk to prepare the 3D model data for the machine.

Matt Roux is Senior Applications Engineer/Group Leader Post Sales, Okuma America Corporation. 

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