Ok that is the problem i was working with millimeters scale! thank you!
But, what is the VCB and how to change the grid step?

Hi!
I have a problem with sandbox tool.
Is the fist time I use it.
I've watched a lot of tutorial but i cannot follow them because i have a problem in one of the initial steps.

I selcet FROM SCRATCH in the toolbar.
I click with the mous eon the first point (origin for example)
Then I move the mouse along an axis and click again with the mouse but nothing happen.
It seems like it don't acept my mouse clik.
In the tips bar it continue show me "select the second corner of the sandbox even if i click with the right or left button of the mouse or hit enter, nothing happen.
Can anyone help me with this issue?

thank you!

Hi!
Is it possible to change the default value for a slider bar?
It always starts from 0.5 but I want it to start from 0 'cause i have a non simmetric movement. So min value is where i draw the object.
Is it possible?

Perfect! It seems to work now (and without creating a multiple coyies ring)

As I told you, If I don't group the object, it work.

I attach an example....
Inthis example the problem is that i can't stop the centrifugal excursion at the collision with the main block.

Pitch.skp

So let me clear concept in my mind.

I have to create a cylinder not from a circle but with multiple segments?
Is this the only way?
No settings for the ring group to make it work as a real ring?

I noticed that if i don't group the ring with the cylinder, i can use a normal pipe, but the ring shift on the wrong direction, how to change it?

Hi!
I'm trying to realize a centrifugal launcher.

It is just a cilinder with a threaded ring that rotat and i want the ring to be launched or unthreaded from the cylinder.
I can't understand which joint to use with the ring w how.
Can anyone help me?

I attach my project.

centrifugal.skp