Here are some more
pic's of my wood motor. As you will see I used to small pieces of copper
and soldered a piece thin tin to one side and left about 10,000th gap you
can see the blue spark as it is running. I tried using epoxy to glue the
copper to the wood but it came loose so I added a rubber band to keep it
on.
The speed of the motor
changed as I moved the reed switch form right to left so I glued it down
after finding the best spot. The coil was wound using 40 foot of 22 ga.
and 26 ga. on a 3/8" x 2 1/2" bolt. I used the cone shaped winding as I
found on your site. But not having any nylon washers I made two washers
from a scrap piece of rubber Kitchen cabinet kick material . The magnets
are ceramic discs 3/4"dia. 3/16" thick glued to the rotor with epoxy. The
rotor is 3 3/4"dia 3/4" plywood with a 1/4" dowel rod glued in the center
for a shaft. I used a roller blade bearing with the grease cleaned out as
you suggested. I used a 7/8" forsner bit to drill the hole for the bearing
and it came out loose so I added some masking tape to the sides to snug
things up a little. I sharpened the shaft on the bottom side to a point
and used a 45deg. router bit to counter sink a small divot in a piece of
nylon cuting board for a bottom bearing surface. (boy it is hard to
believe how mad a wife can get over a $2.00 cutting board) All the rest
was made of 1"x 2" pine on a piece of 1/2" plywood.
The motor starts up
on it's own and takes about a min. to wind up to full speed. It took most
of a Saturday to make but I had a lot of fun making it . I have 16 1"
magnets and think I well try a new one with 8 double magnets on a rotor to
see what happens with stronger magnets and more points to drive it.