jamesp
Cave Dweller
Member since October 2012
Posts: 36,275
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Post by jamesp on May 21, 2020 8:00:58 GMT -5
Have you guys witnessed how the viking reacts when it breaks a belt? I'm assuming it's pretty violent since the belts hold tension between the hopper and the base. Not tims. The vibration is minimized when running on one belt. Surprised me. You'd think it would be violent.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,275
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Post by jamesp on May 21, 2020 8:24:10 GMT -5
I'm also thinking that 'pull' of the orings is a pretty minor component of the motion, but I have to think about this machine more. "I will say, if you lower the hopper or add weight to the hopper it will tame the Vibrasonic. It's achilles heel." Think this makes sense as F=ma, so if the main force is generated from the spinning counterweight , increasing the mass should decrease the acceleration. Imagine for grinding that impacts with more force are more likely to grind till you reach a critical 'fracture' point? .... morning coffee musings. I think you are exactly correct here oregon. The rings are likely a minor impact. However, when a machine is shaking a chunk of mass at +3000 vibs/minute it is totally vulnerable to being numbed due to mass additions. Adding mass on a spring/mass system like this is the easiest and cheapest way to go to reduce destructive amplitudes in most cases. In the case of the Vibrasonic a new hopper that sits lower has a big impact because it brings the rocks closer to the vibration source where the amplitude is less. The taller the hopper the way bigger the amplitude. Those 2 mods(add hopper mass and lowering the hopper) turns the Vibrasonic into a wicked soft materials tumbling machine. I wish the designer of this machine was aware of this when he built it. It is about impossible to bruise glass with the mods, quite remarkable of a discovery. There is a company that makes a Vibrasonic adapter for Mini-Sonic barrels but they are aluminum and too lightweight but sit the hoppers lower. My guess is mass could be added to them for same effect.
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Post by oregon on May 21, 2020 11:13:22 GMT -5
Those 2 mods(add hopper mass and lowering the hopper) turns the Vibrasonic into a wicked soft materials tumbling machine. I wish the designer of this machine was aware of this when he built it. It is about impossible to bruise glass with the mods, quite remarkable of a discovery. maybe bolting a plate of steel on the underside of the top would be an easy mod?
I think you are exactly correct here oregon . The rings are likely a minor impact. However, when a machine is shaking a chunk of mass at +3000 vibs/minute it is totally vulnerable to being numbed due to mass additions. Adding mass on a spring/mass system like this is the easiest and cheapest way to go to reduce destructive amplitudes in most cases. In the case of the Vibrasonic a new hopper that sits lower has a big impact because it brings the rocks closer to the vibration source where the amplitude is less. The taller the hopper the way bigger the amplitude. yeah, unlike the lot-o, the barrel(s) ' motion is not as restricted. I think the loto is a little easier to think about as a hinge point where it sits on the dowel rod. I think the viking base has more freedom, so it's motion may be more of a circular procession as apposed to a shaking back and forth. Different forces in the vertical and horizontal directions... But some sort of eliptical motion seems like it should also lend itself to gentler action? illustrator scribblings from a few weeks back. Wonder how a loto on four coiled spring feet would work...
morning coffee is finished...
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