We used an old record player. we placed it inside a box to contain mess. Contacted a paper plate manufacturer and got thick circles of paper before they were pressed. (They gave them to us for free) Placed paper on record player and let kids drip paint on them. Hopes this helps.
We had this great idea for our Spring Carnival booth where you get a regular fan and use it for Spin Art. We've disassembled it, but we can't get the paper to spin on the metal bar in the center of the fan.
If you have any experience in making a Spin Art booth, please let me know. We're tearing our hair out over here. lol. The carnival is on March 29th.