Something for the small operator

gautman said:
yes its close, i found a company in china making the neffco bowl with the continuous spiral, they even use American Goldminers video. i messaged them and am waiting on a reply
Click to expand...
Appears to be a solid molded drum made out of rubber?
Let us know what you find out.
 

Any price on just the rubber drum?
Thanks
 

I've not been folowing this thread AND today have eye impairement

Will suggest Lil Bertha centrifuge search. Have tried one. The begining builder might could scale up size? they were in Indiana next to Chicago ?
 

one blanket said:
I've not been folowing this thread AND today have eye impairement

Will suggest Lil Bertha centrifuge search. Have tried one. The begining builder might could scale up size? they were in Indiana next to Chicago ?
Click to expand...
list small units for test tubes. Not sure about scaling up in size. Very high speed like 10,000 plus RPM's.
 

had to replace the valve stems on my dually rims yesterday and couldnt help but to think it sure had a nice bowl shape to it. wouldnt be hard to weld a 40 gallon drum or steel pipe to it and then glue in a rubber riffle. might have a lead on a used neffco bowl
 

then that got me into thinking of front wheel drive cars with disc brakes and a cv joint
now you have a solid base that can be driven by a belt drive pulley and you could bolt a stainless or any bowl to the lugs and the rotor for support and if you need parts just go to any parts store for whatever fails
 

gautman said:
had to replace the valve stems on my dually rims yesterday and couldnt help but to think it sure had a nice bowl shape to it. wouldnt be hard to weld a 40 gallon drum or steel pipe to it and then glue in a rubber riffle. might have a lead on a used neffco bowl
Click to expand...
Perhaps the rim bowl shape could be drilled to bolt in a rubber shape?
 

yes, exactly. whatever the bolt pattern is. its probably easier to just chop the rear drive axle instead of a fwd car and couple it to an angle drive gear box just because of the gear reduction.
 

the 'lil bertha gold centrifuge about 5 years ago was a start-up operation .about 2 grand . gas or electric.
i visited a guy who had one to try my raw material. if i'd had any gold i'd have one of my own. thru put as fast as you could load it.
 

Brock at global mining equipment just got back to me and will sell the replacement rubber riffle for the Neffco bowl, $1000 for 100 feet if any of you are interested
 

gautman said:
Brock at global mining equipment just got back to me and will sell the replacement rubber riffle for the Neffco bowl, $1000 for 100 feet if any of you are interested
Click to expand...
Any pictures or size dimension's of rubber?
Rubber is to be glued in right?
 

no, you could try and get them to send you a profile pic lol
i was on their site before, i didnt see a neffco bowl anywhere.
they had what looked like a chinese bowl with a belt drive just more refined looking.
i could ask if that is the new neffco bowl but anyone can just go to their website
 

gautman said:
no, you could try and get them to send you a profile pic lol
i was on their site before, i didnt see a neffco bowl anywhere.
they had what looked like a chinese bowl with a belt drive just more refined looking.
i could ask if that is the new neffco bowl but anyone can just go to their website
Click to expand...
Well the $1000.00 cost of a 100 ft. is high if the life is not good. Any profile will work for a period of time. Thanks for the follow up.
 

if you go on amazon and look for fire pits they have some decent looking bowls

51i-pxKnlXL._AC_US100_.jpg
 

that bowl is cast iron so i didnt buy it
they say the neffco bowl spins at 120 rpm and produces 5 g's.
the bowl looks like its 24 inches in diameter at the top that's 0.6096 meters
i picked up an 18 inch bowl and wondered how fast do i have to spin it to create 5 G's?
18 inches is .4572 meters
rpm 120 and 0.6096 dia.=3.83 m/s
rpm 120 and 0.4572 dia.=2.87 m/s
rpm 160 and 0.4572 dia.= 3.83 m/s
so i need to spin that 18 inch bowl at 160 rpm?

and thats not 5 G's plus aren't we dealing with centripetal force and not G force?

1 G is equal to 9.81 m/s2
5 G is 49.05 m/s2

we need to know the mass that is spinning to figure out centripetal force
any math whizzes here to put in their 2 cents?
im figuring, just spin it up at 3.83 m/s
 

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