Product Development:

Inspection and quantification of internal and surface defects:

Click on Image to Enlarge

Quality analysis of the first six test castings of the 1/200 scale Polaris FBM J-propeller (above left) showed virtually no internal defects and indicated the surfaces to be 98.5% defect-free (as a percentage of projected surface area), with 96.2% of those (surface pits) restricted to the underside - the less visible faces; the forward sides (above right). Even so, these worst-case surfaces were still, on average, 97.3% defect-free.

Click on Image to Enlarge

Analysis of the top surfaces - the more visible, aft-facing sides - showed no surface defects whatever on four of the six test castings, with the remaining two (above) being still 99.7% defect-free, making the overall average - again, as a percentage of projected surface area - of the top surfaces to be 99.9% defect-free.

**NOTE: Although I cannot guarantee every casting will meet any particular statistic listed above (or elsewhere), the quantities above certainly give a good indication of the ballpark of quality which can be expected from these castings.

For the latest status and/or more details: eMail Matty!
NOTE: Be sure to include in your title "Matty's Models" or "castings" - or something unique to modeling - so as not to lose your message to spam-filtering...
- If you have any trouble, contact me with a post on our sister website:
Model Fleet

Copyright ©2006 Matthew M. Stein

(Back Home)