Putting together a drive train with a 3/16" axle. The Nylon gears had a center hole of 3/8". So I got some 3/8" O.D., 0.191" I.D. nylon spacers and some
6-32 x 3/16" set screws.The idea was to tap the spacer for a set screw and then mount the gear onto the spacer for a nice tight fit with the axle while keeping the gear square to the spacer.
I didn't think friction would hold, and it didn't. Superglue failed immediately. 5 minute Expoxy and silicone glue only worked marginally.
Things would start out OK, but after a few hours, the "collar" around the nylon would lose it's bond and start to slip. This surprised me. I expected a failure mode of pulling off the gear since the shear force would be pretty strong, but expermimentation is a great thing and experience a great teacher.
Does anybody know how to bond Nylon to Nylon? Ideally some solvent similar to PVC cement for PVC exists?
On the broader topic, I haven't found good ways to bond a number of common plastics. Epoxy and silicon glues are the best I've found overall but they both will fail eventually.
One article I've found said that arcylic is soluble in MethylEthylKetone or MEK. Don't know if this is true or if MEK is available.
And what kind of plastic is superglue good for anyway?
So anybody have any suggestions or links so I can fill out the following chart?
Nylon UHMW Acetal PVC Styrene ABS Acrylic
Nylon ? ? ? ? ? ? ?
UHMW ? Epoxy ? ? ? ? ?
Acetal ? ? ? ? ? ? ?
PVC ? ? ? PVC Cement ? ? ?
Styrene ? ? ? ? Acetone ? ? Model Cement
ABS ? ? ? ? ? ? ?
Acrylic ? ? ? ? ? ? MEK/?
Thanks,
Kevin