Some machines have the capability to 'trace' a part producing output that can be read by a Burny control or similar. The file created can be stored and the part cut again and again. It can also be sent back to the PC via the DNC link. The first downside is obvious. The machine isn't cutting while the operator spends time moving the machine manually between the inside and outside of the part through the capture and save process. Using a machine to digitize complex parts can be tedious, time-consuming, or even impossible.

Another problem is the quality of the 'copy'. The machine data is composed of hundreds or even thousands of little straight lines (usually around 1~3 mm long). The copy comes out less accurately than the original because these broken small lines create a slow, jerky, stop-start cutting motion.

FastCAM can offer two solutions with regard to optical tracing:

Using the FastCAM System:  If you already have a mechanism for copying, FastCAM can dramatically improve the quality of output with a built-in CAD compress feature which reduces the number of movements by converting the part into single lines and pure arcs. This reduction can be as much as 90% or more! CAD Compress vastly reduces the file size for storage and markedly improves the cut quality and is a very simple exercise. The feature is located under the Erase menu -> CAD compress (see pic).

Click here to watch a Camtasia video demonstration of CAD Compress.    The video shows a drawing with 2 circles overlapping, 1 ellipse and 1 rectangle. After pressing the CAD compress button, the duplicated circle is deleted, and the amount of red points, which represent control points, are reduced. In NC nesting and cutting, each red point (control point) takes up controller resources, especially memory. The CAD compression modifies the geometry to be 'machine friendly'. The result is a better quality part requiring less time to cut.

Cost of CAD compress.
Included in all versions of FastCAM®.

Using the FastCOPY® System:   If don't have any tracing mechanism, FastCOPY® is a PC-based offline system purpose built for this type of work and uses the same compression technology. It's a better practical solution and adds value to any busy service center. It lets the machine get on with the primary job of cutting and also creates good quality copies. In addition, if you have a library of templates for your optical machine you can remove the need to slowly digitize them with the machine by using FastCOPY® for the job. This also address the memory problem as these files are large and cannot be stored on the machine for long as it runs out of space quickly.

• Non-expert system. Anyone can copy parts, templates, drawings.
• Highly accurate.
• A complete practical 2D solution. No other software or hardware requirement other than a PC with Windows operating system and USB port. Very simple & CAD-free. Basic operation instructions.
• Portable and easy to store. New GTCO Rollup digitizer weighs only 3kg & comes in a carry case. Fast setup and pack up.
• Plug and Play. Connect the digitizer into your USB port on your computer and you're done. You don't even need a power supply.
• Output is DXF to allow for part editing & nesting if required.

Questions about optical tracing? Email pat.porep@fastcam.com

Copyright 2007, FastCAM Inc.

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