Hi all, thanks so much for the answers!
I learned a lot of things.
So I understand what i'm looking for is not a drill , or a burr drill but a core box router bit / cove bit without a bearing.
I have pretty good hobby workshop, but my friends have big furniture carpentry/small factory, so I can work there anytime.
I'm planning to make about 50-100 at the moment, but wanting to be able to produce more in the future.
This project is for resonance dampening
I wanted to have my PC, few sets of speakers and other equipment have less resonance, both for the sound and the safety of the devices, I'll be making a lot also for my musician friends with music studio.
After some research I found out that among the endless inventions that can costs thousands of dollars, many people use Squash Ball for dampening.
Specifically people say "Tecnifibre Double Yellow Squash Ball" have the best dampening qualities.
Many people in the 3d printing community also making mountings for these, that you can see here:
Download files and build them with your 3D printer, laser cutter, or CNC. Thingiverse is a universe of things.
The ball is made of mostly rubber, and the wood I'll be working with will be oak, but if it will be too hard perhaps pine or birch plywood.
A device can sit on 4 balls or 8 or even 12 or more.. hence the large amount.
The Ball diameter is 39mm so I thought to get a bit that 39-42 mm as I'll be filling glue anyway between the ball and the bowl.
I see that the 1 1/2" core box router bit is 38mm! almost
I guess I better search for 1-5/8" or if I can't find it 1-3/4".
I also found this but your options are much cheaper, also, the reviews are not good..
OrbiCut 40 Low Speed Cutting Tool by Plano - - Amazon.com