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Post by joshuamcduffie on Feb 19, 2020 12:32:17 GMT -5
MrP - I wish I had a Viking, even one that needed a new motor.
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Post by oregon on Feb 19, 2020 13:45:50 GMT -5
Any idea why the "V" shape (just for Viking?) seems like the shaft is near center on the springs, and just wonder why the thing isn't more rectangular...
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,280
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Post by jamesp on Feb 19, 2020 14:53:49 GMT -5
Any idea why the "V" shape (just for Viking?) seems like the shaft is near center on the springs, and just wonder why the thing isn't more rectangular... Not sure why they used that v shape oregon. The shaft is slightly offset from the springs and the hopper is slightly offset from the shaft. Guessing the sum of the offsets creates the final rolling motion of the rocks. Not really sure why they ended up with the structure shaped like that. Those are some heavy counterbalances for a speed of 3000 rpm. There has to be a point where the counterbalance forces are negated by the weight of the hopper plus rocks added. Apparently the counterbalance forces are powerful enough to shake up to 100 pounds of rock. Large industrial tub vibes like this have some scary big counterbalances and big motors to drive them. And some huge bearings to contain the counterbalance shaft. The counterbalance bearings on this machine have never failed. I do keep them greased. Lots of rock vibes have the counterbalances mounted directly on the motor output shaft. Seems like it would put excessive forces on the motor bearings but vibe motors seem to have good life. Note that the o-ring belts isolated the motor from direct counterbalance forces. Well, o-rings can be stiff or stretchy. I am not aware of the difference caused by stretchy o-rings. It is the o-rings that keeps the hopper assembly pulled down.
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Post by oregon on Feb 19, 2020 22:30:00 GMT -5
It is the o-rings that keeps the hopper assembly pulled down. I hadn't realized that, interesting. I guess motion stops if both break. If one breaks, does the other break quickly too?
Might try a Viton Oring next time, it's a bit more durable than buna for many sealing applications, not sure about belts...
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,280
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Post by jamesp on Feb 21, 2020 21:51:43 GMT -5
It is the o-rings that keeps the hopper assembly pulled down. I hadn't realized that, interesting. I guess motion stops if both break. If one breaks, does the other break quickly too? Might try a Viton Oring next time, it's a bit more durable than buna for many sealing applications, not sure about belts...
There are drive belt o-rings designed specifically for that job. The bag of 50 lasted years. Decided to go that route. If one breaks the motion slows considerably and the single belt rarely lasts a few hours. It is easy to tell from a distance that the sound has reduced. Some o-rings are quite a bit stiffer than others. It seems the stiff or stretchy o-ring would alter the vibration.
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