verhexen
having dreams about rocks
Member since June 2015
Posts: 73
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Post by verhexen on Aug 18, 2015 19:57:19 GMT -5
I've had a single Lot-O tumbler for quite some time now, attached to a cement block and sitting on my garage floor. I recently purchased a twin Lot-O as well, and just started it up today after moving some labradorite into polish stage in my single. I immediately noticed a strange noise when both units are on, a hum that gets intense then softer then intense again. I'm wondering if anyone else has experienced this before, and if so how on earth to correct it. Its not the most pleasant sound, and I'm hoping it doesn't keep me awake tonight!!
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Post by pauls on Aug 19, 2015 2:35:29 GMT -5
I think what you are describing is a beat frequency, Its a sound engineering issue rather than a mechanical problem. You have two identical machines running off identical alternating current supply, they both humm but one is loaded slightly more than the other so the frequency of the hum moves out of phase this has the effect of either the humm cancelling if they are completely out of phase or adding if they are in phase or creating some weird harmonic that may actually beat (sort of throb). You can possibly get over this by building a soundproof box or boxes for the machines. Watch for demolition sites or recycling junk yards and get hold of a few acoustic ceiling tiles from an office. it should be easy to hang together a makeshift box by looping them together with wire or cable ties. Careful in the hot weather though, you don't want to cook your rocks or your home. Possibly leave the lids off the boxes in the hot weather.
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Post by orrum on Aug 19, 2015 5:40:37 GMT -5
Sci if lingo!
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verhexen
having dreams about rocks
Member since June 2015
Posts: 73
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Post by verhexen on Aug 19, 2015 6:16:35 GMT -5
I had a feeling it was something like that. The two are definitely pulsing.. Do you think moving one to the other side of the garage would help?
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Post by Jugglerguy on Aug 19, 2015 6:25:38 GMT -5
Try moving it, it can't hurt. Be very careful if you build a soundproof box. If you put the motor in the box, it could heat up and ruin it. The motors need air to keep cool.
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verhexen
having dreams about rocks
Member since June 2015
Posts: 73
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Post by verhexen on Aug 19, 2015 7:02:31 GMT -5
If moving one doesn't help I'm probably going to run power to the other side of the garage and keep them on opposite ends as far from the house as possible. If rather not put them in boxes cause I'm lazy and I'd rather not have an extra step. As it is, they sit almost up against the wall that's shared with the house, so if I can get my house to stop humming I'll be happy!
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Post by captbob on Aug 19, 2015 8:59:49 GMT -5
If my house didn't hum (from tumblers running) I probably couldn't get to sleep at night. It's hummed for so many years that silence would be disquieting.
I was outside with a neighbor a year or two back and he asked if I had found the bee hive that had to be somewhere close by yet.
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verhexen
having dreams about rocks
Member since June 2015
Posts: 73
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Post by verhexen on Aug 19, 2015 9:57:12 GMT -5
Haha! That's awesome. Our house is fairly new, but I'm paranoid about the intense vibrations damaging something for some reason. I have to say it's making the same noise as my chillers at work...
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