Did you get an answer to your question? The problem with theta j-a and theta j-c is that these are determined using either component on a standard board in still air or moving air. I think the best way is to model the part on the board the with a conduction element for the leads or pads, an...
From ASME Y14.5M-1994
4 HOLES (diameter symbol)9.0 +-0.2
(control frame)|(position symbol)|(diameter symbol)0.3|A|B|E (end of control frame)
The center of the hole (9.0) has to be inside a circle of 0.3 where the center of that circle is located at 29 (horizontal from center) and 50.23...
Make sure that material properties are assigned to each part. I had a problem where I was modeling fused quartz with the CTE of 0.4e-6/K. When imported from SW to Cosmos the CTE value was set at 0.0 and I got that error message. I had to set the value from within Cosmos and it ran ok.
I am building a device that has some moving parts that probably can not help but touch each other and wear. I know that the semiconductor process industry is most concerned with particle generation. Does anyone have recomendations, pointers to literature or anything that would help with...
I want to thank all that responded. There were some ideas expressed that stimulated some of my own. Probably the use of the term "optically sharp" is a poor idea (one mans sharp is anothers dull). It may be usefull to define the hole as a asme y14.5 profile and add a note about the surface...
I have an aperture for a device that uses a laser to illuminate a part. The fellow who designed it didn't want an edge that caused excessive reflections so he noted it as "sharp" or "optically sharp". My difficulty is how do I define this on a drawing so that the machinest knows what is needed...
