Tool for vibrating concrete? (DIY?)

So I've been thinking of making some homemade concrete stuff with different molds I plan on making.

Since I'm not a big expert on concrete and such I've been reading all over the Internet for how-to guides and what not.

And something that seems to be a really good idea is to use a tool to vibrate out the bubbles and air pockets from the molds before they set... and so far I've not found any instructable here on how to make such a tool ( because it's a bit expensive to buy one, and hey.. why not make it myself)

So my question is simply if any one know of a good idea of such a tool, how to make one or whatever..

(maybe modifying something, making one from an electric motor?) I need ideas!  

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AndrewD391 year ago

I like this guy's table, it's just a old tire and a piece of plywood....


AndrewD391 year ago

I would think if you pulled a motor out of a old washing machine it would be easy enough to create a vibrating motor, just foul up the shaft a bit and run it on high spin....

hey there, I work at Baldor electric and I'm pretty sure that we build vibration motors for concrete and they didn't have too high of a price on them; although the price for each model that is listed on our shop floor display, I am not sure if it is actual cost or customer price.

dannyh42 years ago

why waste money? just get a peice of 2x4 and tapper accross the top!

I am on the same quest my friend. I did see a guy on the net that took, what he refereed to as an inexpensive vibrating motor, and attached it to the center of a 24" x 24" square of 1/2" plywood that he had bolted to a tire. It worked amazingly well in the video. However, the motor he was using costs $220: http://www.historystones.com/accessories/vibrating...

I am looking for a more DIY diy solution. Like... using an old washing machine spin dry motor, or a harnessed power drill spinning a bilaterally asymetrically weighted washer solution.

That is what I plan to do. I am building a concrete coffee table that has a 20"W x 48"L x 2"Th. I plan to do the following.

1. Take my Ryobi power drill, which is not cordless and is pretty damn powerful
2. Drill a hole in one side of a large washer.
3. Use a metal file to file the threaded end of a bold into a hex'ish shape, keeping enough of the threads to use a nut to secure the washer to the bolt.
4. Use epoxy to glue a heavy nut to the opposite side of the washer, 180 degrees from the bolt
5. Lock the filed down hex-shape end of the bolt into the drill.

Now... Before I say another word... anyone reading this should be wincing, because I am basically describing how to make a very dangerous, and goofy looking weapon. I plan to never test it unless it is mounted to the plywood that is bolted solid to a car tire. That way, if/when the bolt slings off, it will smack the inside of the tire, and not my kitchen window, or my head.

Come to think of it... there has to be a better way. Anyone?

Those probe-like immersion vibrators might be too big for your tabletop. Just hold a vibrating hand/palm sheet sander to the form, not the ones that rotate or use a belt. Use it without sandpaper, of course. Those units are pretty inexpensive on the scale of buying tools. Good luck.

rickharris6 years ago
Best way to get air bubbles out is to vacuum the mould - A shop vac may be enough.
A palm sander works pretty well. You can pick one up at your local DIY store for about $20 or even less at a garage sale.
Get a Skilsaw, remove the blade, and place the saw against the form. Pull trigger.... Concrete vibrated.

I saw a video on the Fine Homebuilding site showing it being done, but I think its behind their paywall.

Mr_And3rsson (author)  steveastrouk6 years ago
Would the generate enough vibration to get enough air out of the concrete?

Seems like a simple and straightforward thing to do, might give it a shot.
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