I havent seen many hollowing systems that employ carbide bits. Having
23 yrs as a machinist, I was suprised to find no designs that incorporates the best cutting metal.So I made my own hollowing tool, very heavy, uses 3 1" steel rods, and the end has a square slot that accepts half inch sq rod that I mount various tool bits on to hollow out my vessels.
This rig is very heavy, but I made it that way to reduce vibration and allow me to take extremely big cuts. It produces chips as thick as .125" thick in some instances.
You can see my work at my website, just click on the brown menu buttons to navigate.
If any of you are interested in a hollowing tool that really hogs it out let me know, I have complete drawings of my design. Its copyrighted material of course, but the design drawings are very innexpensive.
I keep a large inventory of bowl and vessel blanks for sale as well.
cad