calculation of sag mill weight from bearing pressures

Grinding Mills: Ball Mill & Rod Mill Design & Parts

3-4 Building on strong and safe foundations 3 foundation design loads 3.2.2 Design Stillwater Flood Depth (ds) Design stillwater flood depth (d s) is the vertical distance between the eroded ground elevation and the stillwater flood elevation associated with the design flood.

Hydrostatic and Hydrodynamic Bearings Selection Guide ...

But the FL SAGwise™ system takes this digital audio data and uses techniques such as model predictive control and fuzzy logic rules to assess the mill process parameters.” “Within seconds it has analysed the audio frequencies as well as taking on board power usage, mill weight and bearing pressure.

Stress Analysis of Piping | PIPING GUIDE

The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill, but not the weight of the mill itself. While many mills today are mounted on load cells, others employ bearing oil pressure as a proxy measurement of mill load.

Increase throughput and capacity in SAG mills

Stress Analysis of Piping ... The analysis of piping under pressure, weight and thennal expansion is complex. This complexity can be understood by knovledge of Principal Axis System. ... Wall thickness for Internal Pressure Calculate the adequate pipe wall thickness for a given material and design conditions, as follows: 1. Calculate pressure ...

Ball Mill Trunnion Bearing Lube System

CALCULATING MAXIMUM CONTACT PRESSURE ON A HEAVILY LOADED JOURNAL BEARING FEA CALCULATION Using the ANSYS Static-Structural package, FEA calcu-lations were made to calculate the contact stress. A frictionless, augmented Lagrange method was used to control the contact between the shaft and bushing. The model kept the parameters below fixed: | Beam Deflection Calculators

If the mill weight is dropping very quickly, then the speed should be decreased so as to maintain process stability. In general, either sound or bearing pressure can be used because of the tendency for the sound to increase when the bearing pressure is decreasing. MILL DENSITY CONTROL RULES The feed water addition to Sag mills is also a

Simple Calculations for Cable Pulling | EC&M

This simple and quick field test will give you a rough idea of bearing capacity of soil. Procedure Excavate a pit of required depth. (preferably equal to the depth of foundation) Take a solid ball or square cube of known weight and dimension. Drop the ball or square cube several times, from a known height […]

Sag and Tension Calculations - Refinements and ...'s Beam Deflection Calculators. Beam Deflection Calculators - Solid Rectangular Beams, Hollow Rectangular Beams, Solid Round Beams


The ball mill’s low pressure oil system pumps oil from the reservoir through a filter assembly to clean the oil before the flow is sent to the trunnion bearings. During start-up, the oil is also pumped to the high pressure pump. Dual cartridge filters, connected in parallel, continually clean the oil.

Modelling SAG milling power and specific energy ...

Common types of grinding mills include Ball Mills and Rod Mills. This includes all rotating mills with heavy grinding media loads. This article focuses on ball and rod mills excluding SAG and AG mills. Although their concepts are very similar, they are not discussed here. Photographs of a glass ended laboratory ball mill show action of ball mass within the mill. The action of other grinding ...

Steel Plates - Size & Weight - Engineering ToolBox

The Sagulator helps you design shelves by calculating shelf sag (deflection) given type of shelf material, shelf load, load distribution, dimensions, and method of attachment. You can also specify an edging strip to further stiffen the shelf. See the notes below for usage tips.

Using Fuzzy Control to Optimize SAG Mill Production

Modelling SAG milling power and specific energy consumption including the feed percentage of intermediate size particles M. Silva, A. Casali⇑ Mining Engineering Department, Universidad de Chile, Beauchef 850, Santiago 8370448, Chile

Calculating Grease Quantity, Frequency

Calculating Steel Plate Weight. Weight per sq. feet of hot rolles mild steel plates can be calculated as. W = 40.8 t (1) where . W = weight of steel plate (lb/ft 2) t = plate thickness (in) Insert 3D components with the Engineering ToolBox Sketchup Extension. Steel Plate Weight Calculator - …

The Sagulator – WoodBin

A new monitoring system (MONSAG) intended for indirect measurement of the load filling of a SAG mill is presented. The operating principle is based on the processing of electrical variables of the motor vector-control and process variables, complementing the typical bearing pressure measurement and contributing to the process control quality.

Bearing calculation - SKF

3.4 Conductor Unit Weight Adjustment for Temperature & Creep Traditional sag-tension programs use the fabricated conductor unit weight for their calculations. Trimble’s new program adjusts the unit weight as a function of the temperature and creep. This feature can be turned on or off at the discretion of the design engineer.


The oil that is on the surface of the bearing is forced into a wedge shaped portion of the leading edge of the outer bearing. This will generate enough pressure to lift the entire mill. But if the pump isn’t kept pumping for that revolution the weight of the mill as’ it turns will force the metal of the bearing surface into the oil channels.

SAG Mill Control: It Shouldnt be that Hard

Bearing calculation When selecting an axlebox bearing or unit, SKF should be contacted for assistance with necessary calculations. SKF can provide a portfolio of different calculation methods to optimize bearing selection for any kind of application. Basic calculation principles are mentioned in this chapter, to give an overview of

3. Foundation Design Loads

Based on the proper calculations, you'll need approximately 8,000 lb of pulling tension to pull the 15kV conductors, but you're not done yet. Cables are sensitive to pressure on their walls. The final step in the cable-pulling process is determining whether the pulling tension will compromise the conductor's sidewall bearing pressure limit.

FL SAGwise™ to revolutionise mill liner protection ...

To calculate grease quantity, you need the bearing’s physical dimensions (primarily the outside diameter and width). Once you have these two measurements (in inches), you multiply them together and then multiply by 0.114. The resulting answer is the grease quantity in ounces.

Trunnion Bearing Assembly Ball Mill & Rod Mill

Hydrostatic and hydrodynamic bearings get energy in the form of a flow at a pressure. The oil comes out of the bearing and into a drip pan. In the pan its flow rate and pressure are essentially zero, so all the power that is represented by the initial flow and pressure is expended in the viscous shear the fluid undergoes as it oozes out of the ...

AG & SAG Mill Grinding Circuit Automatic Control

MH Series Grinding Mills A standard range of SAG, ball, and rod mills with spherical roller bearing technology, enabling faster delivery and start-up lead time. OUR MILL RANGE Pebble mills Outotec has a long history of successfully implementing fully autogenous grinding circuits with pebble mills …


SAG mills are the main workhorses in the majority of comminution circuits globally. They need to be fed and kept working round the clock. But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear - the sound of the mills standing still.

MONSAG: A new monitoring system for measuring the load ...

8. Static bearing capacity q all: proportion of footing area for 50% of allowable soil pressure, which means that the actual soil pressure should be less than 50% of static bearing capacity . The a ctual soil pressure equals to the weight of machine and foundation divided by the base area of footing as shown: Actual soil pressure = f f


Modeling SAG Mill Performance. Prior to embarking on the development of any type of high level control strategy, a series of tests is required to determine the nature of the relationships between SAG mill throughput, load (as measured by bearing pressure and measurements inside the mill) and power draw (amps and/or kilowatts).

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