Mylar to CAD Conversion
If your organization has old Mylar drawings, and you’re thinking about converting them to CAD, you’ve come to the right place.
Because Mylar is basically a plastic sheeting material it is affected over the years by changes in temperature, causing older drawings to stretch or otherwise change their size, affecting the accuracy of the drawing itself. So, the question becomes: If you have legacy Mylar drawings that need to be converted to CAD, how can you ensure quality control in the process?
The accuracy of the final CAD file can be of paramount importance, especially in manufacturing and aerospace applications, where micro-tolerances can be critical. Furthermore, these are the very industries that are most likely to have large archives of Mylar drawings that are still in use, due to the long-life of manufacturing equipment and aircraft.
Our Mylar Conversion Process
What does it take to succeed in the accurate conversion of un-dimensioned aerospace Mylar drawings to 3D CAD? Our process includes the following steps:
- Technical Review of Mylar Drawings
- Pre-Scan Clean-up of Mylar Drawings
- Scanning Mylars with Large Format Technical Scanner
- Calibration of Scanned Image
- Check for Quality Control of Scanned Image
- Convert to 3D
- The final QC check ensures that the file meets strict standards for CAD Perfect® Conversion.
Calibration is our proprietary process when we restore the Mylar scan to its original shape. Our experienced CAD specialists have considerable experience in recovering these drawings so that they can provide you with digitized drawings with .005″ accuracy.
Here is a little sneak peek:
The easy case is when there is a dimensional net on the background. But it is possible to deal even with completely undimensioned Mylar drawings. Here is where our calibration process comes in handy. We spent a considerable amount of time ten years ago and finally managed to create our proprietary method.
The biggest problem is to find the distortion coefficients for the various regions of Mylar film. Due to its non-linear distortion process – it can take a considerable amount of time. Our specialists carefully split the whole Mylar scan into separate zones that were affected by different distortions. We skew each zone separately and connect them back together. It pays off with .005” aerospace standard accuracy.
Our method was approved by Boeing aerospace engineers and since then it is suitable for all the possible causes. After Mylar is calibrated, it is imported into CAD software while maintaining and confirming the scale settings. As these drawings were done by hand, it is also needed to avoid copying small mistakes and position errors to recreate the initial design intent.
After conversion – we can deliver the resulting models right into your workflow. Our company specialists showed their ability to follow custom standards provided by our aerospace clients. We can handle the long term conversion projects so all the converted models will arrive just when you need them.
Cost of Converting Mylars
Many organizations assume that the cost associated with the conversion of Mylars must be quite high because of the accuracy requirements. Because we specialize in high accuracy Mylar conversions, we have processes and people in place to ensure quality control at affordable prices. By ensuring specified control, intelligent job management, defined processes, reliable performance, and integrity of data and records maintenance, we maintain tight cost controls, with the savings, passed on to our customers.