Cannot Trim Circle between tangents

[Bane]

Hi,
Sometimes I have problems with AutoCad Map 3D.
I drew two connected lines. Using the command Draw > Circle > Tan, Tan, Radius, after selecting two tangent lines and give the radius, I drew a circle and everything is o.k.. Now I want to trim a part of circle and want only part between tangent points to stay. I can't do that very often. When I try to find the points of intersection (or tangent points) between lines and circle, they don't exist.

Why this happen?

[CarlB]

If you're in a drawing area with large coordinates (say over 1,000,000 for x or y), all sorts of strange things like this can happen.

[SLW210]

Try posting the drawing or at least a screen shot.

[Bane]

Yes, I am in the drawing area with coordinates over 4000000. But why this happen? If I understood you well, this should not be happened if I use the same object at drawing area near the origin?

I tried this now. When I copy the same objects near the origin, and try to trim the circle at this area, whole circle is erased.

Maybe I must find a place in the space where this can be done?
So many strange things happen...

[Bane]

O.k., here is the dwg.

Try posting the drawing or at least a screen shot.

[Alan Cullen]

The mapping grid coordinates you appear to be using will work normally in Map 3D 2008, so disregard that aspect as suggested by Carl. That issue would definitely be a problem in vanilla acad.

I've had this problem often, I just draw a line from the centre perpendicular to each tangent, and use them to trim.

[CarlB]

After copying to near 0,0 there's still the problem that what you drew is still not really tangent. So re-draw tangent lines, then you can trim.

Alan, I hadn't heard that Map 3D had fixed the precision error inherent in AutoCAD. Source?

[SLW210]

For whatever reason, I cannot get that radius to intersect with the circle at 600, but other radii will, some larger and some smaller.

[Bane]

Drawing lines (using osmode 1) over existing lines didn't bring anything new to me. I will draw using Alans' advice till further.

[quote=CarlB;133979]After copying to near 0,0 there's still the problem that what you drew is still not really tangent. So re-draw tangent lines, then you can trim.

[Bane]

Try with different lines and circles. The problem will occur very often.

For whatever reason, I cannot get that radius to intersect with the circle at 600, but other radii will, some larger and some smaller.