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Re: Epoxy it is then. Two mod ideas, please tell me what you think ...

Posted by pburant on June 3, 2004 at 14:41:02:
IDEA #1: Being the fan of coupling I am, I drill three small holes (largest triangle that will fit) in the bottom of my DIY roller blocks and epoxy in small brass balls. This results in the smallest contact area between block and platform, and thus tightest coupling. When I have done this as a tweak to existing roller blocks, their performance increased noticeably. I use metal bases for my DIY rollers, and they perform far better than any of the ones in which I used a wood base. From top to bottom, my blocks consist of bearing surface, sand or brass filing laced epoxy, and brass base. I drill several holes through the brass so that the epoxy mix will fill the holes - this damps the brass and helps prevent resonance. I also drill a large hole in the center of the brass plate, in which the bearing surface seats - this assures that the bottom of the bearing surface is at the same height on all three rollers.
The net of this is yes, I think adding an aluminum base to your blocks is a good idea, and even better if you remove the wood from the assembly. Three small balls epoxied to the bottom of the aluminum would help assure solid coupling to the platform below.
IDEA #2: I have had good luck with epoxying small squares of polished aluminum to the bottom of my speakers to act as bearing surfaces for the rollers, since the wood cabinets are poor bearing surfaces. I have also had good luck by polishing the bottom of the steel chassis on both my amp and preamp. If the bottom of the Proceed has enough space between the air slits to polish it where you need the bearing surfaces to be, I'd go that route first - you can always add more material later if this doesn't work well. If there isn't space for the bearing surfaces on the current chassis, I'd first try small squares of polished aluminum. I'd assume that Proceed didn't put the vents in the bottom to make things inconvenient for you, so blocking them with a single large sheet of metal may not be the best idea.
As for the material, I'd first opt for the aluminum if it is either 6061 or 7075. If not, then the stainless would probably be a better choice.
The other thing to consider is the stiffness of the current Proceed chassis. I'm guessing it's probably pretty stiff, but if not, then a plate on the bottm becomes a more attractive idea. Just be sure to pay attention to heat/ventilation - you may need to create additional vents elsewhere if heat is an issue.
As you could probably guess by now, I highly recommend epoxy for joining any plates to the bottom of any chassis. It's all about coupling, and epoxy is the best coupler I know of when it comes to adhesives.
Have fun - I hope you can get it all done today!
-Pete