Hi,,,,I have 12 volt dc motor with a flat shaft. What is the part called that I need to
attach to the shaft to make a small wooden platter turn?

 

Please attach the clear photos as 800x600 .jpg file, if you have some more info just post it, if our members know it then they will let you know.

 

Mounting hub:

http://www.kr4.us/universal-mounting-hub-5mm-aluminum.html

 

If this is for direct attachment you need a mounting hub with a set screw or grub screw to make contact with the flat.
Max.