Hi Christian...

I don't understand your question.

Could you please re-word it. Maybe "Draft" is not the right word?

Regards

LSL Tekpro ■

Graham-

Draft in one sense refers to the depth of a plowshare-ore depth cross section on a conveyor maybe? The other is of course the keel depth of a loaded ship or barge in the water.

leonZ ■

Ah, you've got an inclined belt conveyor and how steep can you go before before material slips on the belt?

I think this is one for seeking guidance from a belt conveyor manual where there are usually charts or graphs indicating a loss of efficiency with charts or graphs. ■

Christian..

Its not the friction of the material on the belt that is important when you decide on the angle of inclination of a belt.

(Water will go up 16 degrees if the speed is over 3.5m/second)

The important thing is the material shape.

Round shape lumps roll backwards and cause huge problems, especially when the capacity on the belt is very low.

For pure round type stuff, use 10 to 11 degrees

For non-round stuff, especially when you have a wide disrtibution of material size (with fine material binding the big material) you can use 16 to 17 degrees.

For dry fine material that would pour out between your fingers, use 13 to 14 degrees max, (but don't try and load it at this angle)

A bag of cement on a conveyor belt will start to slip backwards at 20 degrees.

The Goodyear Blue book has a usefull table of angles for different materials

Hope this is what you wanted to know

Cheers

LSL Tekpro ■

My pleasure..

Glad I could be of assistance

LSL Tekpro ■