Virtual Sharp Corners
Virtual Sharp Corners
(OP)
I was taught a while back that when dimensioning to a virtual sharp to label the dimension as T.S.C. ("theoretical sharp corner", although I've heard some people call it "to sharp corner.") However, I have been unable to find this method documented anywhere. I've seen this done with just witness marks or no indication at all, which seems to cause confusion in print interpretation on some drawings.
What is the correct or, alternatively, preferred method for this?
What is the correct or, alternatively, preferred method for this?





RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
This is the first time I have ever hear the acronum TSC. I must admit I was rattled about twenty five years ago when I first saw the acronum BCD (Bolt Circle Diamter).
I have, on occasion, placed notes on drawings wtating that dimnensions were to sharp corners.
There is no substitute for clear English on your drawings.
JHG
RE: Virtual Sharp Corners
As far as the marks, technically the intersection mark is just a pair of extension lines, which are valid drafting entities in most standards.
Intersections for non-90° corners with fillets are a perennial problem, as there is no good definitive way to physically measur such an animal without aid of digital devices.
RE: Virtual Sharp Corners
Abbreviations are asking for trouble in an age where one can not assume the person making your part speaks the same language as you.
RE: Virtual Sharp Corners
Extension lines are used to indcate the point or line on the part to which the dimension applies. ... When extension lines refer to a point which is not a physical feature of the part, the extension lines should be drawn through the point.
No mention of TSC or similar.
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
The block illustrates a bend with extension lines to the corner, with the words "dimensions are taken from true corner."
"But what... is it good for?"
Engineer at the Advanced Computing Systems Division of IBM, 1968, commenting on the microchip.
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners
RE: Virtual Sharp Corners