This instructable shows how to build a sanding table from about 3 quids worth of 3/4" plywood scraps.
Note, I buy the small cuttings of plywood from a local hardware store I once worked in, all I can carry for a few quid, sometimes if they have way to much scraps you get it for free as they don't have to dump it.
Your choice of a good quality sandpaper
spray contact adhesive
saw, drill, screwdriver, and not surprisingly a wood lathe.
This was a super easy build and is now one of my most useful tools.
Step 1: The sanding disk
I intend to make some new back plates so all my various disks are always ready to use.
The plywood was screwed to the backplate with 3/4" screws, picture only shows 4 screw in place but i did use all 8.
The back plate was then attached to the lathe and was turned down to the desired size.
Plywood is not the nicest to turn, tools need to be sharp and tend to get quite hot and require cooling and also sharpening more than usual. safety goggles or even a face visor is highly recommended.