hello Ask20: Alright you got the VSMA book !

VSMA formula in CHAPTER 6 will take care of the material above.

Specifically FACTOR F will adjust the size of the screen area needed to do lighter material than 100# cu/ft which is the assumed CONSTANT or one factor in the formula.

LIGHTER MTL = larger screen area needed to handle volume

HEAVIER MTL = smaller screen area.......

..........................

BED ACCELERATION: We talk of this in terms of FPM.....foot travel per minute going down the screen from the feed end to the discharge end. This rate is assumed the material is travelling down a 20 degree slope (CONSTANT formula plug in rate of ONE)

If steeper angle of decline on the body.......the bed acceleration would be faster FPM...........if lower angle ......SLOWER FPM

hoping this helps as usual.........KEEP SHAKING.........

George Baker........Vibration 101 ■

FOOT TRAVEL on 100 lb per cu ft material ........travelling down a 20 degree slope.........is around 60 FOOT PER MINUTE....for sand and gravel.

You can do a little test.......spray a stone flourescent orange then toss it onto feed plate of vibrating screen and time the number of seconds it takes to drop off the discharge end.

THIS EQUALS YOU FOOT TRAVEL PER MINUTE.

gEORGE ■

SORRY.......to finish off the last post..........correctly......take the number of seconds to drop off the discharge end and convert this into FOOT travel per MINUTE......which will generally come out to 60-75 fpm for sand and gravel at 100 # per cu foot at 20 degrees.

sorry for that.........

GB ■

http://store.aem.org/index.cfm?fusea...ndardsscreens

Attachments

store_hd (JPG)

■