jamesp
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Post by jamesp on Dec 31, 2014 19:35:48 GMT -5
I wonder if the shaft mounting on the commercial units is intended to keep the size of the unit a bit smaller. The more open design of James' unit should make maintenance easier. Maintenance easier, yes. Adjustments for trail and error too. That thing may be difficult to dial in. Heard of the copy cat killer, this is the copy cat vibratory. Guessing things will have to be moved and eccentrics lightened or made heavier, etc. Basically copying the Viking, but other vibe tubs very similar. Still planning on mounting the springs with out heat. Looking at a rubber plug with a washer and bolt compressing it to expand the rubber against the spring. Something...
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Post by pauls on Jan 1, 2015 2:48:51 GMT -5
I built one similar (very) I scrapped it in short time as I couldn't get the vibration gentle enough and it shook itself to pieces in very quick time, plus the legs chewed holes right through the concrete floor. I had the hopper mounted on a steel plate which was just too much mass. Once you had the lot going up it wanted to keep going up and going down it was trying to ram itself though the concrete. Your idea for the springs should work, it did on mine until the springs broke (Toyota Landcruiser valve springs) so that shows how extreme it was. I think yours will probably need to be bolted down. I will be very interested to see how it all works. Interesting observation of shotgunners too about the shaft being off centre, mine was centre and the tumbling action just wasn't right, a lot of rocks jumping around but no rolling. I had been toying with the idea of fabricating or casting an aluminium hopper to lighten the thing but now will hang off and watch with interest, if it all goes well I might drag the pieces out of the scrap bin and have another go.
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jamesp
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Post by jamesp on Jan 1, 2015 3:56:15 GMT -5
I built one similar (very) I scrapped it in short time as I couldn't get the vibration gentle enough and it shook itself to pieces in very quick time, plus the legs chewed holes right through the concrete floor. I had the hopper mounted on a steel plate which was just too much mass. Once you had the lot going up it wanted to keep going up and going down it was trying to ram itself though the concrete. Your idea for the springs should work, it did on mine until the springs broke (Toyota Landcruiser valve springs) so that shows how extreme it was. I think yours will probably need to be bolted down. I will be very interested to see how it all works. Interesting observation of shotgunners too about the shaft being off centre, mine was centre and the tumbling action just wasn't right, a lot of rocks jumping around but no rolling. I had been toying with the idea of fabricating or casting an aluminium hopper to lighten the thing but now will hang off and watch with interest, if it all goes well I might drag the pieces out of the scrap bin and have another go. No glory here pauls. I own this old Viking vibe. I am copying it's weights, springs, shaft locations. This Viking will vibe a hopper from 8 to 50 pounds. So it has a wide operating band width with simple eccentric adjustments. So it is dialed in to a wide range of hopper weights, maybe I will get close to it's user friendly set up. Would never attempt this project if this Viking machine was not here to compare to. The Viking runs very smooth and does not shake the floor, vibrations restricted and stabilized within the unit. Apparently people have run 100 pound hoppers on it. This one being set up for a 15 pound hopper.
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Post by pauls on Jan 1, 2015 15:11:43 GMT -5
It was actually a Viking I was attempting to copy, but I have never seen one. I remembered seeing adverts for them in old magazines but it looks like few if any of the actual machines ever made it to Australia so I was really just guessing how the thing worked. Next time you are doing photos could you angle the camera so I can see how you have done the shaft and eccentrics? How they are adjustable? (maybe a ruler for scale) Your shaft appears very similar to mine but my eccentrics were not adjustable, (which is probably where my problem lies) Anyway great build so far James, its really firing me up to have another go at it.
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Post by pauls on Jan 1, 2015 15:19:28 GMT -5
Forget that. I just had another look at your pictures and figured out what those two nuts were all about, very simple. It looks like I way over engineered my eccentrics with much too much weight.
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jamesp
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Post by jamesp on Jan 1, 2015 16:30:13 GMT -5
Forget that. I just had another look at your pictures and figured out what those two nuts were all about, very simple. It looks like I way over engineered my eccentrics with much too much weight. Got the whole project and Viking in a flick set Paul, so ya can sit on the buttocks and brain storm, here ya go: www.flickr.com/photos/67205364@N06/sets/72157649367092502
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Deleted
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Post by Deleted on Jan 1, 2015 17:40:03 GMT -5
Is your homebuilt larger than the viking? I can't tell. Looks like fluorite worked out OK.
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Post by pauls on Jan 1, 2015 18:33:24 GMT -5
Thanks James. That photo set explains everything, my eccentrics are like the ones in the viking except its just the one each end, if I part each of them down the middle and redo the set screws that should give me all the adjustment I need. Now all I need is the time to do it, too busy now I am retired.
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jamesp
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Post by jamesp on Jan 1, 2015 18:41:36 GMT -5
everyone retires and get too busy. I retire 6 months out of the year for 22 years now, work hard the other 6 months. Has worked well. But stay busier during the off 6 months, go figure. let's see that vibe
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jamesp
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Post by jamesp on Jan 6, 2015 9:32:15 GMT -5
Did research on mounting a flat ground compression spring to a flat surface. It was trickier than anticipated. This method commonly used on automotive springs, cut out fender washer will deform when bolted down. Half ring to retain, and will be welded to flat surface
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Deleted
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Post by Deleted on Jan 6, 2015 10:33:42 GMT -5
This is an epic build!
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jamesp
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Post by jamesp on Jan 6, 2015 11:54:33 GMT -5
This morning has been a 22F, frozen finger syndrome. Wife took over inside shop, me forced out side. May get that thing spinning today if I can find a sheave for the motor.
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jamesp
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Post by jamesp on Jan 6, 2015 18:59:27 GMT -5
Rattle is coming from motor mount, it is temporary and on a door hinge. Camera amplifies the sound well too. It is running 1/3 speed of a Viking. It is only 1/2 full. The motor sheave is crooked causing rattle too. It needs heavier eccentrics to vibe it's 15 pound capacity, only 1/2 full in video. Eccentric shaft was moved to under front of hopper which helped start the roll. So the initial run was some what successful.
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Post by captbob on Jan 6, 2015 19:26:44 GMT -5
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Post by MrP on Jan 6, 2015 19:32:23 GMT -5
Looking good....................MrP
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jamesp
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Post by jamesp on Jan 6, 2015 19:43:49 GMT -5
Hope you are no where near by if one of those eccentrics break free. To add weight I loosely screwed a 1/2 inch bolt in them, hoping they wouldn't sling off. Had an eye on them.
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jamesp
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Post by jamesp on Jan 6, 2015 19:49:07 GMT -5
Looking good....................MrP Thanks Michael. Will tighten things up a bit. Just slapped that motor on, 1/8 HP air over, it was getting pretty hot. maybe a 1/4 HP internal fan cool is best. May end up putting the double belt deal on it, would reduce vibration coming from the v-belt and left to right rock. The left to right was not an issue though.
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39don
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Post by 39don on Jan 6, 2015 20:05:43 GMT -5
Nice start-up James, the single v belt has much promise. If you might try having the motor mount plate longer to increase the radius from motor to hinge pin. This may or may not reduce the noise factor but seems as though it would be more "motor" floating and possibly not as erratic. Just a thought. If the weather holds out enough tomorrow you ought to have it nailed down soon. 39don
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Post by pauls on Jan 6, 2015 20:24:05 GMT -5
Thats looking good James I found the old shaft and eccentrics of the one I attempted to build, all the rest of it has been repurposed, I am itching to have a go again but at the moment I have a temperature issue too, 43 degrees here today, Thats around 110 of your degrees I think, I tend to hibernate when it gets so hot that all your tools are too hot to use.
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jamesp
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Post by jamesp on Jan 6, 2015 20:42:55 GMT -5
Nice start-up James, the single v belt has much promise. If you might try having the motor mount plate longer to increase the radius from motor to hinge pin. This may or may not reduce the noise factor but seems as though it would be more "motor" floating and possibly not as erratic. Just a thought. If the weather holds out enough tomorrow you ought to have it nailed down soon. 39don I picked a thin supple v-belt Don. The motor sheave has warpage causing rattle. The motor has to be reworked in the direction you pointed, or fixed with a spring idler.... A long swing spring idler/tensioner may absorb some of the vibration, the belt has a bit of whip in it too. General slop in the drive. But it is close, and running 1/3 the speed at the idler shaft of the Viking. May need more mass in the eccentrics, unless speeding it up a bit solves the weak pulses. Funny, you could move the swing on the motor and change the vibration a lot. That's what made me think about an adjustable spring belt tensioner.
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