On Jul 15, 10:14 am, rashid111 wrote:
Assuming one has a fairly straight approx 4.5" OD x 10" long round
motor with smooth surface, what would be a good way to get some heat
sink type of deal ?

One some smaller motors (2.5" OD, 4" long), I made some by boring out
some 3.5" OD 6061 Aluminum billet and using a 1/8" parting tool to
make fins. The heatsinks were bored about a thou undersize, slit, and
glued on with some thermal adhesive.