Add round with larger radius than cylinder

[jjengel]

Hi everyone. I was hoping to get some guidance on whether it's possible to place a round on the end of a cylinder when the radius of said round is larger than the radius of the cylinder. In this instance, I have a part that has several cylindrical protrusions that have a radius of .375" and call for a R.400" round on one end. When I try to apply that radius to the cylinder SE return a "Blend rdaius too large" message.

Why is this important? Why not use a .375 radius and call it a day? Because this part was originally drawn in 1992 and is being produced/cast with that same radius. All I want to do is accurately model and detail it, but for the life of me cannot find a way to do this. I've been trying to accomplish this through the Round command, but maybe there's another way? Using ST3...

Any thoughts?

Thanks in advance.

Jason

 

[burhop]

The top face ends up getting consumed and there is no more face to round to.

In the worst case,you can sketch a 0.4 arc tangent to the side of the cylinder and going to the center line of the cylinder. From that, you can create s region that can be rotated around the end of the cylinder to remove the material. You will have points at the tip but I guess you have that now.

To avoid doing that over and over, you could also copy and paste the new feature.

Someone here may have a better idea.

Mark

 

[jjengel]

Mark,

Thanks for confirming that it is not possible using the round command. I hadn't tried the revolve yet, but it looks like that will work. If you see the attached file applying the .4 radius to the end leaves the smooth round I was looking for...again, thank you.

Jason

 

[HDS]

What you are asking is not a problem with the round command it is a problem with geometry. what you are asking can not be made with a round.
If it is tangent at the top than it is not at the bottom or you have a spline instead of a round.

 

[burhop]

OK, I see...

So what you have is not technically a round since it is not tangent where the cylindrical part meets dome part. You have a slight edge.

Like HDS said, you could use a spline or parabolic to get something smooth but I guess that wouldn't match the original design.