Preparing spinning wool with a drum carder is fast and fun! You can use it to mix dyed fibers of various colors.
A drum carder has two large rotating spools that are covered with dangerously sharp needles, so you need to be very careful of any children (or pets) who might be tempted to touch (or sniff).
The smaller spool has course needles and is where you insert the wool. It teases the wool and takes out any course materials.
The larger one, which looks sort of like a drum, is covered with fine needles and this is where the batt of ready-to-use carded wool collects.
Keep the properties of wool fiber in mind as you card.
Carders come with a clamp to hold the machine still on a table. Using it on a picnic table works well. During the winter, I manage by sitting it on the floor and placing one hand on top with the other hand working the crank.
I do not need to oil the needles to keep them from rusting since the lanolin residue in the wool gives them protection.
I do need to use the flicker comb occasionally to clean out fibers that are stuck on the surface.
Warning: Carding wool is a dirty job, no matter how clean the fiber appears. Little bits of dirt and dust will come flying out.
If you try carding on the floor inside the house as I described above, put a towel down first. Or plan to get the vacuum out and clean the spot off the rug! (Guess how I learned that tip.)