1 Determine the total number of hours worked and from your OSHA Recordkeeping logs determine the number of injuries and/or illness NOTE: Employee hours must reflect all full-time and part-time workers, including seasonal, temporary (including temporary contract workers if supervised by company personnel), administrative, supervisory, clerical, and overtime

Get PriceBond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills* Various correction factors may have to be applied The test is a closed-circuit dry grindability test performed in a standard rod mill

Get PriceCalculation of the power draw of dry multi-compartment ball mills 225 The mill load that is the volume of charge in the mill is the principal determinant of power draw Estimation of the ball load that is mixed with the cement charge is difficult and can be highly erroneous So direct measurement must be taken for calculation of mill load

Get PriceOct 24, 2018· To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill This is usually calculated from the input leads to the motor, then multiplied by ,

Get PriceMilling operations sometimes, require the rotation of job correct to fractions of minutes, for each groove, slot etc, to be cut evenly on the job surface The accuracy of spacing of teeth is very important particularly when the work is of precision character eg, gear teeth, shafts, cutter teeth etc

Get PriceThe mill dimensions, (D × L), are 0204 × 03 m and it is loaded with 855 kg steel rods 14 to 20 mm diameter The mill rotates on rolls and its frequency is set to 70 RPM corresponding to 85% of the critical frequency The mill power is = 225 Watts, calculated by (6) Fi- P nally the product is wet screened to find the size d80 24

Get Pricework index covering grinding of fine particles is labelled M ib (Morrell, 2008) M ia values are provided as a standard output from a SMC Test ® (Morrell, 2004 a) whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test (M ib is NOT the Bond ball work index) M ic and M ih ,

Get PriceThe Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus

Get PriceThe rapid index plate has 24 hol Solution: Number of holes to be moved = 24/N =24/6=4 Therefore after machining one side of the bolt, the index plate has to move by 4 holes for the next face to the machine Q 2 Set the dividing head to mill 30 teeth on spur wheel blank by simple indexing

Get PriceThe milling process – definitions Cutting speed,v c Indicates the surface speed at which the cutting edge machines the workpiece Effective or true cutting speed, v e Indicates the surface speed at the effective diameter (DC ap)This value is necessary for determining the true cutting data at the actual depth of cut (a p)This is a particularly important value when using round insert cutters ,

Get Price10 mm), the crushing work index SWI is applicable; for me-dium size particles (from 100 mm to 2100 μm) — rod milling work index RWI; for finer particles — ball milling work index BWI (Table) These indexes are readily obtained using the special-purpose laboratory equipment (Fig 1) Finding the total specific energy consumption

Get PriceOct 19, 2017· C — the mill drum rotational speed,% of the critical speed; D — the mill internal diameter, m At result B = 25mm or less necessary to use the correction factor 13, ie the grinding balls average diameter should be 325 mm in the feed mixture

Get PriceMay 19, 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada RenoIf you have any questions, need advi,

Get PriceMill and Trash Plate Setting The Sugar Engineers can offer an effective and rapid mill setting service for your factory In order to get a sense of what we can offer you can do mill setting calculations online for your mill now Setting a mill includes the calculation of the openings between the various mill rolls and well as the shape and position of the trashplate

Get PriceA function of the work index of the material Bond developed an express ion to quantify mill shaft power based on data from a number of laboratory and industrial ball mills: Pâ†“S = 733Jâ†“B Î¦â†“c (1-0937Jâ†“B)Ï â†“b LDâ†‘23 (1-01 / 2â†‘9 – 10Î¦â†“C) Ï S = Mill power D = Mill diameter in meters

Get Pricebecomes a constant in the last three milling cycl This is also an indication that the desired circulating load has been achieved The Bond standard method requires 7–10 grinding cycl The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i – Bond work index ,

Get PriceNov 21, 2015· Need help with helical milling calculation Hello guys , , Making precision helical gears for replacement in the absence of drawings is often detective work combined with careful metrology and good shop practice Hint: replace meshing pairs of gears If one gear failed there's a 999% chance its mate is defective

Get PriceFeed Characteristics (work index) Reduction Ratio; Under given load and particle size requirement, capacity is a function of mill length and diameter: Q = kLD 2+N N is related to mill diameter which decreases with larger diameters k a constant equal to Ï€ /4 A chart showing rod mill capacity vs mill ,

Get PriceThe Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of

Get PriceMilling operations remove material by feeding a workpiece into a rotating cutting tool with sharp teeth, such as an end mill or face mill Calculations use the desired tool diameter, number of teeth, cutting speed, and cutting feed, which should be chosen based on the specific cutting conditions, including the workpiece material and tool material

Get PriceEvery time work is wasted, there is a loss that results in the “Cost of Quality” escalating When talking about waste, we can define or look at many definitions, variations or types of wastage such as: waste of waiting, over-production, inventory or work-in-process, transport, motion, input defects, producing defective products, unnecessary ,

Get PriceThe Bond's standard ball mill is used to determine the work index value of differ ent sampl The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm If the breakage

Get PriceThe basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed ,

Get Pricerod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWh/t The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency This raises the point that, in some cases, the Bond EF4 oversize factor calculation is ,

Get PriceMilling Formula Calculator Milling Formula Interactive Calculator: Solve for any subject variable in bold by entering values in the boxes on the left side of the equation and clicking the "Calculate" button The solution will appear in the box on the right side of the equation

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Get PriceFeed Rate Calculation for the Rotary Axis The feed rate for a rotary-axis is specified in units of angular velocity, either in degrees per minute or in degrees per tool revolution To convert the tangential feed rate on the circumference of a circle that is defined by the radius R from inches per minute (IPM) into degrees per minute (°PM), the ,

Get Price8-3 Centrifugal force outward Fc mp& 2 Dm 2 (81) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners Gravitational force Fg mpg (82) The particle will remain against the wall if these two forces are in balance ie

Get PriceOct 20, 2018· To calculate the percent change between two non-base index numbers, subtract the second index from the first, divide the result by the first index and then multiply by 100 In the example, if the third-year index was 1191, subtract 1146 from 1191 and divide by 1146

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