For making motors to precise weight I cut the exact length required, wash
the rubber, dip the ends 3" into 30% strength glycerine/green soap lube and tie
an overhand knot as close as possible to each end and very tight. I make a
loose clove hitch in some tan thread, "mercerized cotton covered polyester",
selected after extensive research and testing consisting of reaching into the
drawer of thread and pulling out the closest color match to tan rubber. I
put the ends into the loose clove hitch from opposite directions so the knot
is past the loop, snug down the thread knot, lube everything, pull the strip
through until the rubber knots jam up against the clove hitch, tighten the
clove hitch and follow with a square knot and a half. Cut the thread ends off
about 1/8" or less. Then I pull the rubber strip very tight just to check. I
have been using this method with motors of about 0.042" x 0.070". I break a
lot of motors, but only one came undone at the knot and it may have been the
overhand knot came out and slipped through the thread.
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Received on Fri Apr 27 2007 - 21:03:13 CEST