jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 29, 2017 16:38:52 GMT -5
EPDM rubber is what most roof liner is. Carlisle and Firestone were the main guys making it. Keep in mind tire inner tubes are also EPDM.
|
|
|
Post by HankRocks on Nov 29, 2017 16:42:12 GMT -5
MrP, Thanks for the warning, my intention is to only run the polish stage in it. I just pulled the liner out, looks good and hopefully it can hold up to polish run. Will test with some old polished rocks. It fit's the steel housing perfectly so it should be good, looks about as thick as what is on the Thumlers Model B. I always bevel the edges a bit on any slabs I tumble. Those Brazilian agate slabs are a bear to bevel!
|
|
|
Post by 1dave on Nov 29, 2017 18:49:39 GMT -5
You couldn't beat that with a Lotto!
|
|
|
Post by MrP on Nov 30, 2017 5:34:02 GMT -5
You couldn't beat that with a Lotto! Not to sure about that Dave. Let's see how it does with obsidian. The only vibration change would have been the amplitude by WEIGHT and DIMENSIONAL adjustments.(many ways to skin a cat) 1) this assembly is heavier(basic). Added weight is going to numb the amplitude. 2) this assembly holds the hoppers closer to the counterweight shaft in vertical direction and closer to pivot point of rocker plate in horizontal plane. If the hoppers were mounted 6 inches higher(vertical plane) above the rocker plate the amplitude would be much more extreme. Like being in a crow's nest in the rough ocean. (waves rolling against side of boat) Being on the bow of the boat is the shortest amplitude, being 50 feet up in crow's nest you may be swinging 10 feet but same amplitude making a tired sailor. Also, by simply moving the center of the hopper mass closer to the pivot point in the horizontal plane of the rocker plate will decrease amplitude. Like being in the center of the boat verses being along the gunnels.(waves rolling against side of boat) Rocker plate(a boat in the ocean with waves hitting the side of the boat), pair of springs at top of photo, pair of springs at bottom of photo. Note shaft is closer to the top pair of springs, making the bottom pair have more amplitude - the kicker springs. The amplitude is higher on the bottom pair of springs to generate rock rolling action in one direction. Ha, this machine is simple because it is 2 dimensional vibration. The is no Z component like a bowl vibe. Bowls are XYZ dimension vibes. jamesp I am wondering if because there are two sets of counterweights vs one set in the center on the Rockette is the reason the large rocks move to one side in the Vibrasonic.
The piece of Pet Wood is just to the left of the 5.5" slab. The slab and wood have stayed in the center most of the time. In the Vibrasonic I have always had a problem with slabs going to the side and staying flat against the side. So far I am liking the Rockette just wish it wasn't so loud..................................MrP
|
|
|
Post by MrP on Nov 30, 2017 6:06:31 GMT -5
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 30, 2017 6:08:57 GMT -5
MrP's home made hopper. 6.75" I.D. X 9" long Counterbalance shaft
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 30, 2017 6:10:51 GMT -5
I restarted the video and it ran fine. Sweet build Michael. I see the bigger pulley is on the motor making counterbalance shaft faster than motor RPM.
|
|
|
Post by MrP on Nov 30, 2017 6:13:43 GMT -5
jamesp Thanks for fixing those............MrP
|
|
|
Post by grumpybill on Nov 30, 2017 7:39:26 GMT -5
jamesp I like your boat/waves/sailor analogy. Shows changing amplitude, but not frequency. Other than (possibly) reaction time/hysteresis. Not sure you're on track here, though: Don't bowl vibes also operate in only two dimensions? The difference being side-to-side vs up-and-down?
|
|
|
Post by grumpybill on Nov 30, 2017 8:12:05 GMT -5
Not sure how an off-center weight rotating on a vertical shaft can generate vertical motion. Maybe it comes from the springs? If so, your tumbler would generate horizontal motion.
Someday maybe I'll buy a vibe tumbler, tear it apart, and experiment.
Edit to add: I gave this more thought while doing my daily clean and sort. Springs have at least some motion perpendicular to the direction of compression/release. Add the possibility of an unbalanced load... But this effect should be the same regardless of the rotational direction of the counterweight.
|
|
|
Post by HankRocks on Nov 30, 2017 9:26:36 GMT -5
Ok, I see how the split counter-weights work, the closer they both are to being off to one side, the larger the imbalance and the stronger the vibration. Move them to be opposite of each other and now the shaft is balance and the vibration is mostly dampened. If my assumption is correct then it's a very good design.
I suppose the circular movement in the round barrels is a result of the shape of the barrel and the axis of vibration. It would be interesting to see what would happen on say a UV-18 if you had a rectangular barrel. My guess is they would move same as any other vib tumbler. Axis of Vibration may not matter.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 30, 2017 21:14:40 GMT -5
A tub tumbler like the Vibrasonic, Mini Sonic and Rockette are 'tub' tumblers grumpybill. They can have multiple dividers put in them for tumbling in 2 dimensions like a ferris wheel travels. Or no dividers for long parts. More basic motion. Bowl tumblers generate a rotating 3 dimensional spiral spiral path. More complicated motion. Thanks to the shape of the bowl and orientation off off-balance, spring orientation, etc. Tub tumblers are easier to tinker with because of the more basic motion. Dead spots or catchment zones are avoided in all tumblers. check out 'tub' tumbler motion @hankrocks The Lot-O is an odd creature because it appears to have an egg shaped bowl in a 'tub' counterbalance set up (I think). I never have looked at a Lot-O up close but it is a unique set up.
|
|
|
Post by grumpybill on Nov 30, 2017 22:09:42 GMT -5
Ah...my mistake. You meant the motion of the stones inside the tub/bowl. I thought you meant the motion of the tumbler tub/bowl, itself.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 30, 2017 22:26:01 GMT -5
Ah...my mistake. You meant the motion of the stones inside the tub/bowl. I thought you meant the motion of the tumbler tub/bowl, itself. I have fun playing with the vibes. They intrigue. Good pastime for a retired fellow like yourself...
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Nov 30, 2017 22:28:38 GMT -5
MrP, is this grease ?
|
|
|
Post by grumpybill on Nov 30, 2017 22:47:52 GMT -5
I have fun playing with the vibes. They intrigue. Good pastime for a retired fellow like yourself... Hell, I have enough pastimes on my plate between learning to rotary tumble, learning to wire wrap, and harassing city government officials. If I start messing around with vibes I'd have to give up the time I spend on internet forums!
|
|
|
Post by MrP on Dec 1, 2017 6:24:02 GMT -5
MrP , is this grease ? Yes the bearings are right above. Had to replace both the motor and counterweight bearings. I knew I might have to when I bought it but I only paid $75 for it so I may have come out all right...................................MrP
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
|
Post by jamesp on Dec 1, 2017 6:29:38 GMT -5
MrP , is this grease ? Yes the bearings are right above. Had to replace both the motor and counterweight bearings. I knew I might have to when I bought it but I only paid $75 for it so I may have come out all right...................................MrP I was going to be a smart alec and ask you to clean up your machinery. You only paid $75 ? Now I am full scale jealous.
|
|
|
Post by MrP on Dec 1, 2017 6:44:59 GMT -5
Yes the bearings are right above. Had to replace both the motor and counterweight bearings. I knew I might have to when I bought it but I only paid $75 for it so I may have come out all right...................................MrP I was going to be a smart alec and ask you to clean up your machinery. You only paid $75 ? Now I am full scale jealous. I don't keep my equipment pristine like some do, but I do keep it in top use condition. I would rather use it then clean it. I get a kick on people talking about cleaning there saw and wiping the inside so it is new looking. I take a small container and dip all the crud out put new oil or coolant in, depending on the saw, then get to cutting again. All it takes is a cut or two and it is a mess again anyway. I do make sure the polished material and jewelry I make looks nice!...............................MrP
|
|
|
Post by MrP on Dec 1, 2017 7:58:12 GMT -5
I don't keep my equipment pristine like some do, but I do keep it in top use condition. I would rather use it then clean it. I get a kick on people talking about cleaning there saw and wiping the inside so it is new looking. I take a small container and dip all the crud out put new oil or coolant in, depending on the saw, then get to cutting again. All it takes is a cut or two and it is a mess again anyway. I do make sure the polished material and jewelry I make looks nice!...............................MrP My rotary tumbler has a roof over the motor. It is in a greenhouse and after every clean out I wash the whole machine down with water from the garden house. The rotary is to the right. Notice slurry floor to right. It is a slurry concreted floor. Weed free. Nasty operation that rotary. Not meant for white carpet. But a dedicated grease gun sits next to the rotary and the bearings stay well greased. I have to say that when I started this hobby I tried to keep things clean but when I was working and running 7 rotary barrels, 5 vibe tubs, and 3 saws it got to be too much to keep everything pristine..................................MrP
|
|