Vibration, mass and massive arguments

[Rich]

I was thinking about the epoxy method the other day after reading through various build logs. As epoxy is doing little to dampen any vibration, I was wondering whether a solvent based moisture cure urethane would be a good alternative, perhaps a two part casting resin.

If not a direct swop, an alternative approach would be to exclude sand from the box section and coat the interior with a thick film of urethane. The method would be akin to making china cups. A mold is filled with slip and emptied, leaving a thin film behind. The actual practical approach could be the targeting only one internal face of the box section and leaving a thick 5mm film i.e. seal off both ends and pour it in from above. As the resonance comes from the motors, the first section I would look at is gantry. An alternative section to consider filling (depending on the urethane being used) is the gap between the supported rail and the box section it is mounted on.

It would take a bit of research to find the right product, its something we manufacture in the UK, used on industrial floors, shipping and oil rigs. Another product to consider would be RTV silicone.

I have a product in my garage at the moment, I'll give it a try and see if there are measurable effects.