Looking at a grizzly screen plant (box screen with adjustable grizzly bars) to use screening under one inch material.
The grizzly box screen costs a lot less then the small vibrating box screens.
With the adjustable grizzly bars the opening can be adjusted from one inch to 12 inch plus.
To see pictures of what machine I am communicating about go to rocktough.com web site, look at 10 foot model.
Has any one any experience with using a grizzly bar screen plant to screen under one inch material?
How did it work? What problems did you have?
How much production did you get, and what size bucket did you feed it with?
Never even considered a grizzly for anything smaller than 6''.
Biggest problem with grizzlies is slightly oversise material getting stuck between the bars which of course can be mitigated by a careful operator if high rate of production is not required. My guess would be keeping grizzly bars alone set at 1" clear of oversize material to be highly labor intensive and frustrating.
Have no experience with the unit you are considering but it looks like the 10'ft unit would work best for what you describe using the optional screen with the grizzly bars removed.
Production and quality/gradation depends on material. Keep in mind that any fines such as sand, dirt, etc will easily fall through 1''- screen media which can also become plugged with moist clay and/or slightly oversize material caused by impact from repeated use.
A lot would depend on your location and the geology of your material source as well as your expected rate of production.
If you are working with primarily river bottom mostly round gravelly type of material I would think this unit would work ok.
Have no idea what the asking price for a new grizzly like this is but for what it's worth I have seen decent one and two deck used smaller mobile vibrating screens sell for around 20k. "Reed" and others manufacture various configurations that are very basic, tough as hell and easy to repair and operate.
If you do look into a power screen I suggest considering units with coil springs only!!!! Stay away from any that use a semi eliptical or leaf type of spring as they become very unreliable as the spring ends/mounting points wear out.
Check out "Reed Screen All". I think in the long run you will find something of this nature to be a better investment as far as versatility and production.
