CAD Tips

For those who are in the design departments this section contains a few tips on improving graphical communication. Our main concern is that a drawing contains all of the necessary information to construct the part. Clear and accurate drawings help ensure that each customer gets the product they are expecting. An analysis of previous nonconformance, reworks and rejects has shown that a significant source of errors is due to poor or incomplete drawings. A poor drawing can take as much as five times longer to process than a good drawing.
Due to the number of people and steps involved in the manufacturing process, the drawing should stand on its own and not require verbal ancillary information. Hansen Industries can provide a service to bring drawings to standard or refer the customer to a third party CAD provider. The manufacturing time and part quality can be improved further if the drawing is transmitted electronically or provided on diskette.

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Drawing Standards

This section describes a set of drawing standards, which, if followed, will improve the chances of receiving a part that could be used in production on the first run.
All drawings should be 3rd angle projection, according to North American standard. If a drawing is in 1st angle projection (usually from European customers) it should be noted on the drawing. With most parts a minimum of three views should be given (i.e. top, front, side).
An isometric view with hidden lines removed will aid in the visualization of complex parts. Provide a general assembly drawing for multi-part assemblies.

A title block should include:

x.x    ± 0.020"
x.xx   ± 0.010"  ± 0.005"

ANY CHANGES TO A DRAWING SHOULD FORCE A NEW REVISION LEVEL. A complete copy of ECO (Engineering Change Order) or detailed revision notes will hasten revision updates. This saves the operator from having to check every dimension to find the changes.
When dimensioning parts, please adhere to these guidelines:
For CAD drawings, always draw full scale with true size for holes, cutouts, special shaped holes (i.e. single and double 'D') and DB cutouts.

Silk screening is the process of applying ink graphics to a surface. The ink used is very durable and comes in many colors.
To arrange for silk-screening the following information is needed:
Location of graphics on the part.
Full size color separated film of the graphics.