New subject: Plastic gears OT somewhat

4 Nov 2003

...
  The biggest problem with these small nylon gears is
that
nothing sticks well to nylon. When you push it back on the shaft, it
will break most any bond.
 What I recommend is that you core out the center of the gear so
that is just slides onto the shaft without and tension. You make
sure the inner surface is a little rough. Use JB Weld to glue it
on. Don't over drill the center or you won't be able to get a
good centering. Make sure things are clean and that gravity doesn't
allow the JB Weld to run into the bearing while setting. Use a
good cleaner, like brake clean ( automotive product ). 
I can't do that because it isn't a round shafted gear. Its a straight 
gear notched stick that is pulled from another gear. The stick in turn 
pushes or pulls other actuators in sequence.

As a result, there is a HUGE amount of binding tension on the stick, and 
no glue I have tried yet as survived even the first use.

I'm thinking of other solutions like JBWeld or some other high strength 
option and just coat the broken point with it. The hope is that it won't 
so much glue the break, as simply create a splint around it to hold the 
broken section in place.

Or, just chuck the whole dang thing in the trash and start over (which is 
the easiest solution, and I know in my head that I should do that... but 
I'm sure all of you can relate to the obsessive need to fix something 
rather than throw it away)

-chris
<http://www.mythtech.net>

Non crap plastic glue