Motorized Dirt Soil Screening Machine

[tlbuser]

SkunkWerX

Got your PM - OK here is my version of the flywheel-o-death...

Let me know what do you think.

Larry

Maybe I'm missing something in your design. How do you bolt it and keep it from slipping?

SkunkWerX,
I like the new addition to the family. Found a tidbit here, that may help EZ Screen Screening Equipment with Efficient Kinetic Drive Outperforms Other Screen Machines with Larger Engines.

 

[GuglioLS]

TLBuser-

My thinking is to replace the shaft with a 1/2" bolt or threaded rod. The disks would be pinched together between two serrated flange nuts. To adjust amount of imbalance, loosen one nut, slip one disk in relation to the other, then re-tighten the nut up against the disk. That would allow for infinite adjustment up to ~ 50% mass of the two disks.

Larry


Larry

 

[SkunkWerX]

SkunkWerX,
I like the new addition to the family. Found a tidbit here, that may help EZ Screen Screening Equipment with Efficient Kinetic Drive Outperforms Other Screen Machines with Larger Engines.

tlbuser, thanks. I poured over a lot of websites for these machines when building, but most are fairly guarded about the specifics of their systems.
They show some coil springs in pics, sometimes, but that is about it.
EZscreen does make some nice looking equipment.

I grew up in Brandywine MD, how far South are you in MD?
My cousin lives in Mechanicsville.

 

[akpilot]

GuglioLS
Your solution to adjusting the viberations is awesome!! I'm not that smart I cut a lawn mower blade off and that wasn't enough viberation so I welded a chunk of metal on the end of it.

EZscreen makes very nice products, another company that I looked at before building mine was Innovative Loader Accessories - Portable Soil Screeners, Skid Steer Attachments, and Equipment they make a simple, portable screening plant

 

[chickenman]

my solution was to make a crank with 1" shaft with a 3/4" bolt welded to the end offset for the crank

i took two 3/4" pillow block bearings and bolted them to a bar of steel between the crank and the screen.

two 1" pillow block bearings for the shaft

the advantage is that you control the amount of movement and you vary the rate of shake with pullys.

it works well on my setup

 

[SkunkWerX]

my solution was to make a crank with 1" shaft with a 3/4" bolt welded to the end offset for the crank

i took two 3/4" pillow block bearings and bolted them to a bar of steel between the crank and the screen.

two 1" pillow block bearings for the shaft

the advantage is that you control the amount of movement and you vary the rate of shake with pullys.

it works well on my setup

Can you post a picture of this?

.

 

[chickenman]

Can you post a picture of this?

.

somehow my reply got posted to a seperate thread

"reciprocating shaft and pitman arm"

 

[tlbuser]

tlbuser, thanks. I poured over a lot of websites for these machines when building, but most are fairly guarded about the specifics of their systems.
They show some coil springs in pics, sometimes, but that is about it.
EZscreen does make some nice looking equipment.

I grew up in Brandywine MD, how far South are you in MD?
My cousin lives in Mechanicsville.

Actually, what I noticed was theirs turns the screen box counterweighted shaft at 1150 RPMs. What's special about that number?

Right now, I'm located on the west side of La Plata.

 

[SkunkWerX]

Actually, what I noticed was theirs turns the screen box counterweighted shaft at 1150 RPMs. What's special about that number?

Right now, I'm located on the west side of La Plata.

I'm not sure about that number, or how they are accomplishing the final "shake". They are using higher HP, Diesel, which tells me they are using brute force (torque) to accomplish the task.

I think a lot of the RPMs and configuring is also highly dependant on the amount of materail being placed on it. Those larger units are having 2 or 3 yards dumped on them all at once. And they still have a realtively small screen area, so, the weight per square inch is quite high when compared to my puny machine.

 

[GuglioLS]

Hi SkunkWerX,

I am very curious how the adjustable off balance flywheel design would perform under real life conditions. I hope you don't mind I had them plasma cut. If you don't want, that's OK, I can use them as coasters or something.





My theory is the new flywheel vibration characteristics will be similar to that of a gaussian sine wave. I believe the behavior of the flywheel that's on there now is more of a square-wave. The theory is the round flywheel would be more like shaking the machine up and down as opposed to hitting it rapidly with a hammer. If your willing to give it a try that would be great and a good experiment in the interest of science. If they do not work, feel free to use them as Frisbee's.


Larry