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Post by satamax on Mar 25, 2013 10:04:58 GMT -8
Hi everybody!
Well, i was toying with the idea of making myself a vibrating table. A wooden plate, an electric motor, and counterweight and an old tyre.
Few questions, how long do you vibrate? How big the counterweight? Do you screw borders, or battens on the side of the mold? Any advice? Is half horsepower enough?
Thanks a lot.
Max.
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Post by smarty on Mar 25, 2013 11:47:32 GMT -8
Apparently an old washing machine motor makes a good basis for a vibrating table. I think that the Rpm for vibrating normal concrete is something like 2500 - 3000 RPM. HP depends I guess on how heavy the table is, how heavy the stuff you are vibrating, etc. 0.2 - 3 HP for arguments sake?
If you stick a cam that is a semi-circle on and maybe 80mm DIA and about 10 mm thick. I would also maybe try running it on some kind of variable speed control ( a sewing machine pedal? Would that work?) I would also make a kind of metal shield around the cam in case something comes flying off! If you make up the thickness of the cam with two thinner cams you could also rotate then relative to one another to vary the intensity of the vibration.
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JBW
New Member
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Post by JBW on Mar 25, 2013 15:45:51 GMT -8
I would recommend putting a counter weight on a shaft between 2 pillow block bearings. That way you can change the speed with pulleys. Also, the bearings in the motor won't last long with the the off balance load. Something like this...  |
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Post by satamax on Mar 25, 2013 23:29:48 GMT -8
Hi guys! Sorry, i thought you were all aware of this www.youtube.com/watch?v=GWImU7CCU8gI have an old flanged motor, which i can spare. I'll add a counterweight to the arbor, and i'm done. |
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Post by Vortex on Mar 26, 2013 3:29:47 GMT -8
Hey, great link, thanks.
When I made my stove, for a vibrating table I just put my electric drill in the jaws of my black & decker workmate (fold up portable work bench) with the chuck key in the chuck of the drill as the eccentric weight, worked brilliant.
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Post by satamax on Mar 26, 2013 4:12:35 GMT -8
Hey, great link, thanks. When I made my stove, for a vibrating table I just put my electric drill in the jaws of my black & decker workmate (fold up portable work bench) with the chuck key in the chuck of the drill as the eccentric weight, worked brilliant. You're lo-tech mate, i love it! I've vibrated stuff with a jigsaw with weights atached to the blade ;D |
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Post by matthewwalker on Mar 26, 2013 8:13:47 GMT -8
I use a Sawzall, no blade. Works great.
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Deleted
Deleted Member
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Post by Deleted on Mar 26, 2013 8:37:08 GMT -8
I use a Sawzall, no blade. Works great. An oscillating saw is a natural vibrator. However for a single cast core, which would likely be the case for most people, I would save lots of work and the vibrating table by casting a shell against only one surface. Maybe as a single piece cut in two with a knive before complete hardening. |
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