Pushing coal uphill - as the grade gets steeper...

[Telkwa]

We're running D-10's and D-11's. Pushing coal uphill with coal blades. The Cat Performance Manual doesn't seem to provide any helpful graphs. Does anyone have any data on how much push we lose as the grade goes past 15%? How about 20%?

We are talking percent here, not degrees. 50% = 45 degrees.

 

[stumpjumper83]

maybe you need a different performance manual. On page 1-46 of edition 38 it shows a chart for grade performance. On a 20% uphill grade its a production factor of about .55

Meaning if your getting 10 yards on the level, with a grade correction of .55, you will get 5.5 yards on a 20% uphill grade. 10 X .55= 5.5

No mention is given for different material or blade configurations.

 

[John C.]

Maybe someone here could inform me if I'm right or wrong but I believe 45% is 100 percent of slope. If that is true then 20% would be approximately 9 degrees.

Let me know.

 

[d9gdon]

I agree John.

 

[inyati13]

As a reclamation specialist before I became a cattle farmer, we took short classes in measuring slope. A 100 per cent slope is 45 degrees. The angle of repose for coal (bituminous) is 40 degrees. I believe the little tool we used was called an abney hand level. We also had a little clinometer to measure angles. I am not sure if you can say a 20 per cent slope is 9 degrees but if you have a abney hand level or such device it will have a scale that converts degrees to slope.

 

[ttazzman]

Fwiw ....the easiest way for me to understand % of slope is to understand if you have 100units horizontal distance for each unit of verticle height that is one % of slope, so yes when you have 100 units of run with 100units of rise you get a 45* angle i have attached a online calculator that will figure this for you

#1 so if you need to know angle in degrees enter( b) (run) and (a) (rise) and the angle will be answer (A)

#2 if you know the degrees and and want percent enter ( A) (deg) and put 100 in( b) and percent of slope will be the (a) answer

http://www.csgnetwork.com/righttricalc.html

hopefully i got this in right

 

[diggerop]

Here's the easiest to read slope chart that I've come across. You can easily see how slope, degrees and percent relate to each other. On the Angle of Repose chart I believe the ratio part is the same as the slope (1-1, 2-1) part of Grade chart.

 

[inyati13]

Diggerop, that is like the scale on the Abney hand level. Good to see it again. I just looked on the net. There are some inexpensive hand levels that would be handy to have.

 

[stumpjumper83]

wasn't the question how much dirt will a dozer push

 

[637slayer]

i operate a d11r in a production dozing setup, its got the semi u blade, the pits i dig are 110 foot deep, the material has around 40% swell, the first half goes pretty fast the second half is pushed all uphill, what is the cutoff point of a productive push in distance, is it better to go steeper or longer, i know for the material i push the dozer will push a full bladefull (45 yards) up pretty steep, i prefer to go steeper and shorter, never so steep that she lugs under a full load, but steep enough that if a rock starts dragging and i have to get realigned with my slot i have to take the load up to the top in two halfs, is there a chart for these questions?sorry if this is off topic