Titan-4 drawing aproximation issue

CAD/CAM/CNC
1

Hello,
I’m trying to complete the TITAN-4 part for the certification. I’m working in Catia and work in the metric sistem. That means that I’m converting all the dimensions of the drawing to mm. I noticed that the first sketch, which I believe is an equilateral triangle, is not perfect because of it’s carthesian dimensioning. The issue occurs in the sheet 1, at “1.150in” (pos. in C7). Same for the resulting dimension from sheet 2 “1.114in” (pos. B7). I believe it’s an aproximation issue, because in case of an equilateral triangle, the lateral faces should be at an angle of 60 deg. But going further on sheet 3, the dimension “0.667 in” (pos. C8) for the center of slot rotation has a similar issue. How should I consider this part as? An equilateral triangular prism or the profile given by the aproximated dimensions?

1 Like
2

Could you change your measurement default from mm to inches in catia for this CAD creation? When faced with a drawing or model, I always create the CAD using the unit type that is called out. No need to convert each measurement then.

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3

I can do that, but I don’t think that is the issue, because the program does the conversion automatically. I type the imperial value and the program does the conversion. I sent in the Step file according to the drawing. I hope it passes the inspection :slight_smile: .