Dear All

One group of senior colleagues found an error in opposite faces of extruded features both ways either by direct solid extrude, or forming solid from closed extruded surfaces. That is opposite face have different area when we used a part of spline to form a closed loop, or curve defined by equation. That error not only questions about the result of their study moreover questions about SolidWorks capabilities. Is there a way to resolve this problem? Now they are thinking to move on Non dessault software like Creo parametric or Unigraphics.

Thanks

Kulbir Sandhu

Hi Kulbir,

It seems that for some reason the higher the precision the more you will see a difference.

I raised this with my VAR and this is the reply for R&D.

MarkI have just had a chat with SOLIDWORKS with respect to your query from the forum

post. I’m no maths PHD so am passing on their message.

Basically the answer here is that whenever non analytical geometry is used (i.e. not a

square, rectangle, sphere or cylinder) there will always be negligible

differences to some of the measurement results certainly when you approach the

maximum model resolution in SOLIDWORKS which is 8 decimal places. All

SOLIDWORKS is doing is what a human could do with paper based mathematics- but

a bit faster and non-analytical geometry such as the model in the forum and

that you provided is calculated using Integration which is liable to slight

differences at that level. So despite it being seemingly trivial based on a

linear extrude or mirrored feature the software still builds each face in

SOLIDWORKS one at a time behind the scenes so all calculations will be done

separately which means these errors will crop up but to these negligible levels

of 6+ decimal places. So in essence, the CAD method of solving these surface

areas is doing what a human would do with a calculator and based on the

non-exact and rounding of figures the results with invariably by slightly

different.

As I have said I don't work to any where near this sort of precision, but some may, hope this helps.

Thanks

Mark (SolidWorks 2015 sp2.1)