Hi Denman, is it possible for you to post the .3dm model file with the pieces in it that you are having problems with?

There are a lot of different potential things that can cause problems with booleans.

For example if you surfaces have fold back on themselves with "self-intersecting" areas, that can cause problems.

Areas that have barely overlapping edges or faces can cause problems, it is better if pieces push all the way through each other instead of barely touch.

It is difficult to know what particular problems you may be running into just by looking at a screenshot, I really have to look at the model.

But it looks like you may have a lot of pieces that barely touch each other though, it will be better in general if you make the pieces to be cut out to be a bit larger than the base piece instead of sharing a common surface area with the base piece.


> Q1: Is it possible to merge a bunch of objects (the little profile pieces
> Let's say 40 of them) with one base object (the base tyre geometry)
> by using one time a bolean command ?

Normally yes that is possible, but if there is a problem with the calculation of one particular piece out of the batch it can cause problems with the whole operation when done in a large set like that.


> Q2: When try to bolean 1 object at the time from the base tyre it
> works for some of the object but for other objects wich are basically
> identical only located on an other place on the tyre it doesn't work.

I would need to examine the area that you are talking about to be able to give you some more information on this one. Maybe the other area has some additional edges nearby which are complicating things.


> Q3: Should I use the merge command ? because the differance
> command will cut a hole and ik want to keep the profiles on the
> inside of the tyre.

The merge command will cut up everything and keep all the pieces, so if you want to keep all the pieces then yes use Merge.

But if you want to keep only the cutting objects, then the best way to do that currently is to use Ctrl+C to copy them before running the boolean, then run the boolean which will delete the cutting objects, then use Ctrl+V to paste the cutting objects back in again.

If you use Merge, everything including the cutting objects gets sliced up which may not be what you want.



> Q4: When i try to union or join theprofile pieces it doens't works

Join is only for surfaces that have open edges (by open meaning edges that are not already attached to another surface) that are next to one another.

To give you some more information on why Union might be having difficulty, I will need to look at the model.

- Michael