blackout5783
starting to spend too much on rocks
Member since November 2011
Posts: 248
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Post by blackout5783 on Nov 4, 2012 19:10:20 GMT -5
So let's say you had a 12" vibe lap. What would you use if you needed to replace the motor because when you checked on it and saw that it wasn't moving, there were smoke stains and melted plastic under the motor from the now incinerated fan blades?
Not that this actually happened to me today...just curious.
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Nov 4, 2012 19:41:49 GMT -5
I would use another motor to replace the one that burnt out!! They are fairly cheap and shouldn't be too hard to replace... just check the sticker on the now cooled off motor for basic info you will need... cheap ebay and local flea markets for used motors or buy new if you can afford it.
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blackout5783
starting to spend too much on rocks
Member since November 2011
Posts: 248
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Post by blackout5783 on Nov 4, 2012 21:38:42 GMT -5
Unfortunately there was no sticker or any info on the motor. So I'm stuck in terms of rpm and hp. I'm guessing maybe 1725ish rpm and 1/8 hp? It only has to spin a weight, so I would guess that the hp requirement is minimal. Maybe?
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Post by roy on Nov 4, 2012 21:51:47 GMT -5
what brand is it ?
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Nov 4, 2012 23:35:10 GMT -5
Unfortunately there was no sticker or any info on the motor. So I'm stuck in terms of rpm and hp. I'm guessing maybe 1750ish rpm and 1/8 hp? It only has to spin a weight, so I would guess that the hp requirement is minimal. Maybe? The motor that you replace it with has to be rated for up/down position, to match the old motor, otherwise you will burn the bearings out quickly. Motors from old floor buffers may work depending on rpm speed the HP wll probably be higher though. I would go for 1/4 hp and 1750 rpm - used motor and see how it works out for ya. cheaper that way! Good Luck
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blackout5783
starting to spend too much on rocks
Member since November 2011
Posts: 248
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Post by blackout5783 on Nov 5, 2012 0:57:27 GMT -5
It's an old HP 12 inch. I can't find any information about it online. Hell, I can't even find any references to a 12 inch highland park vibrating lap at all!
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Post by johnjsgems on Nov 5, 2012 9:04:10 GMT -5
You can either check what Covington Engineering uses on their 12" vibe lap or call Diamond Pacific. They may have literature as they ended up with HP after it passed from MK to Contempo Lapidary. Best bet would likely be to get Covington's specs and measure you motor shaft and housing size and mounting specs. You should have enough to find a replacement. I've never heard of an HP 12 either.
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Post by Drummond Island Rocks on Nov 5, 2012 13:53:01 GMT -5
I replaced my motor on my lortone 10" vibe lap and the original was 1525 rpms but I cant remember the horsepower rating off hand. I found a 1550 rpm on ebay that was new for about $60. I'll will check on the HP when I get home.
Chuck
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Post by johnjsgems on Nov 5, 2012 15:59:28 GMT -5
Some of the really small motors are rated in watts or amps rather than hp.
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Post by Drummond Island Rocks on Nov 5, 2012 17:12:21 GMT -5
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Nov 6, 2012 2:05:57 GMT -5
The 3M573 is the "correct" motor. However, I've found the end thrust on it to be so extreme that I couldn't get a polish that wasn't really grainy or orange peeled due to the rocks hopping and skipping in the pan. It's because the newer versions of this and the 1/10hp 3M576 have aluminum fan blades in them that are much heavier than the older ones that were plastic (That's what melted - been there, seen that) and they are never exactly square, so therefore the up/down impetus gets transferred to the shaft and the pan.
]What works really super on my 20" Lortone "jiggle pan" is the 3M569. It's 1/15hp and 1550rpm but is an "open air" frame without the internal fan. If you live somewhere that's as unbearably hot in the summer like here in east central Florida, you might have to place a 6" high speed fan on 1" standoffs underneath the unit, blowing upward into the motor to cool it some. I had to replace my original motor about a day and a half after my lap arrived (VERY used) because the bearings seized. The 3M569 I put in would only run like a half an hour and then trip the thermal protection. Was stumped for a bit but found out it is rated for 40 degrees C. That's 104 fahrenheit. It is easily 98 degrees in the shade here and really hot at night, too and so the motor didn't have enough margin to heat up the normal 6-10 degrees without tripping the protection. The motor has been pretty much running 24/7 on my back porch and only broke once after 9 months when one of the input power wires' solder joints to the windings broke. Just soldered it up right, strapped them down better so they couldn't jigle around inside the motor and was good to go. C-ya, Rick
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Nov 6, 2012 2:07:05 GMT -5
Oh yeah - The 369 is a good bit cheaper than the 573/576, too!
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rockhound97058
freely admits to licking rocks
Thundereggs - Oregons Official State Rock!
Member since January 2006
Posts: 760
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Post by rockhound97058 on Nov 7, 2012 22:37:54 GMT -5
LOL - First thing I'd say is you must have a Lortone Lap. That's exactly what happened to my 20" lortone several years ago. It happened during the night so lucky it didn't flame out and catch my shop on fire.
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