Offset v-cutter

I can not specify the diameter of a v-cutter. Now I am wondering what is the distance of the offset if I use this tool on an outside/inside offset contour operation…

…or should I use the tip diameter as the tool diameter? I am using the following tool for deburring and chamfering: http://tinyurl.com/loll7yd

Thanks
C.

I think I just found out, that the offset depends on the depth of the operation - although the tool path is not updated immediately - can somebody confirm this?

Thanks
C.

Have a look here :

http://forum.sheetcam.com/viewtopic.php?t=5280&highlight=chamfering

Les explained it

Richard