DIY Vibrating Table

Originally Posted by droog

I would not expect the bearing in a bench grinder to last very long with that type of punishment.

Yeah, that's what I was thinking.

Some sites say to use orbital sander with no paper on underside


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Originally Posted by droog

There are purpose built concrete vibrators on ebay starting at $100

I bought a very similar concrete vibrator off eBay and so far it has worked well for my ICF filling.
The one thing to note is it is a left hand thread to connect the motor to the shaft. It took me a while to work out what was going on.

I also tried the out of balance disk on an angle grinder and it does work although the frequency of the oscillation appeared too high from my limited experiments. I am sure it was not doing the bearings much good but both angle grinders and bearings are cheep.

It depends on if you want to vibrate the concrete only or vibrate the whole mould..... Doh - read heading - an orbital sander lacks enough power for all but a very small table and the weight of the concrete soon adds too much inertia. I would try something like a washing machine motor and an eccentric mass.