Radius wrong

QCAD Professional QCAD Troubleshooting and Problems
1

QCAD Version: 3.7.0

wrong radius.dxf (96.1 KB)

I have attached my drawing file (DXF/DWG)

I have a rectangle 460x230mm but the longer side have a radius of 3537mm.

When I do the radius the highest point is not in the middle!

Why is this happening?

2

Why do you think the highest point is not in the middle? How do you verify this?

  • Visually → post a screenshot
  • Using a snap mode → which one?
  • Using an information or measuring tool → which one?

I’m asking because that’s very likely the problem and there might be a solution, depending on your method.

3

Verified, the highest point is coinciding with the middle point.
Why: The arc centers are at X-zero, the vertical edges are at X-230 and X+230.

The highest position in Y of a circle with radius 3537 and center at (0.0, 230.0) is located at (0.0, 3767.0) and the arc in question is a part of such a circle and is symmetrical in regards with the Y-axis.
Q.E.D.

Regards,
CVH

4

If you look at the DXF I attached I have put a line across the top where the highpoint of the radius should be, but the are is highpoint to the left of centre.

5

If your verification is based on the visual appearance of your drawing, please post a screenshot as you might see something different that we do (depending on your display preferences).

6

Hi,
Because of the limited resolution of a display, the top arc and the horizontal line may look to intersect at the left and at the right of the Y-axis.
Or they seem to be co-linear for a small portion in the middle.
The difference for the representation of both entities on screen is there less than 1 pixel.
In reality the difference becomes very small with a minimum of zero in the middle.

Perhaps the real intersection point of those two at vector level is more clear.

  • Menu Info .. Position (IO)
  • Tool options: Add measurement = checked; Text size = 10
  • CAD Tools toolbar (Typically at the left side) .. Snapping to ‘Manual Intersection’ (SY)
  • Indicate near the horizontal Line and the top Arc, confirm twice with a left-click.
    => Intersection at (0.0, 3767.0) ; A point entity is placed at that exact position.

    Regards,
    CVH