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How Do I stop the vibratory lap from shaking itself apart?

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Author Topic: How Do I stop the vibratory lap from shaking itself apart?  (Read 248 times)
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« on: June 12, 2015, 12:14:29 pm »

 help Help!  My father gave me an ancient Blue Star vibratory lap that you use grit in. It is probably 18" across (or maybe 16"- I haven't measured) and has several heavy stacked metal trays that appear to just stack right on top of each other. You are supposed to put flats, slabs or possibly the flat side of bookends in various stages of polishing on each level. I believe you put a slurry of grit and smallish amount of water and the rocks in each tray, with the higher grits in the higher trays in case of spillage.  The trouble is when I turned it on and tested it (without grit), those trays start shaking and moving, separating and wending their way off the machine and onto the floor (what a mess that would be!) I checked and the machine seems to be level, so I am not sure what to do to stop it. Do I strap these trays in place somehow?  The first level (which has green felt on it and I can't imagine using) is held down by large heavy spring/hooks from the base, but the other trays don't have holes for the hooks nor are the springs large enough to stretch. What is the secret I am missing here?
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« Reply #1 on: June 12, 2015, 12:40:43 pm »

I'm not familiar with the Blue Star brand. Could you post a couple pics of the machine ? It may help us to figure out what's going wrong.

Two things that do come to mind. Some machines have clamps that hold things together. Also, check the connection between the motor & the bottom pan. There may be an adjustable weight on it which needs to be adjusted in towards the shaft to tame down the amount of vibration.

Are you sure those pans were supposed to stack ? Maybe your father had a separate pan for each grit, and they are supposed to be used one at a time.
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« Reply #2 on: June 12, 2015, 12:46:48 pm »

I'm sure Jakesrocks is right they are not ment to be stacked, there are probably leg leveling feet so it has to be leveled out and the load has to be balanced too.
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« Reply #3 on: June 15, 2015, 04:44:19 pm »

People buy extra pans to avoid cleaning out (and wasting grit) between steps.  Diamond Pacific sells a "Double Deck" lap that has two pans.  They are clamped to hold in place.  As you have found out you can't just place a pan on top.
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« Reply #4 on: June 16, 2015, 10:36:26 pm »

An old friend of mine used to have one of the old Star laps. I never saw it used with more than one pan at a time. It's very nice that you have extra pans, though. I have one of the 'Double Decker' laps. Even with that one, I usually only use one pan at a time because one is for grinding grits and the other pan is for polishing. I almost never polish anything, just flat lap, so I don't have a great deal of use for the polishing pan.
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