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Rock Crushing Rule of Thumb
If the coarse feed size is reduced, the circuit efficiency will approach that of the stage-crush and ball mill circuit Hence, if the JKDropWeight test Axb parameters (a measure of rock competency) are less than about 40, then secondary crushing is worth considering Source Ausenco; More: Grinding Rule of Thumb Froth Flotation Rule of Thumb...
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Milling: Design Rules
Design of Parts for Milling: What follows is a list of recommended design practices for milled parts The list is not exhaustive, but is what our staff has found to be most useful Design milled areas so that the end mill required is limited to 3:1 in length to diameter ratio As shown in the figure below, longer end mills are prone to chatter...
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Chain Saw Bars: How Big is Too Big?
The only rule of thumb for this is the bigger the more versatile the saw is I have a little Husquavarna 353 that is great for my little chainsaw de-barker setup, or for cutting small pole woods like eastern red cedar all day long I believe it is 517cc and I would never dream of milling with it...
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Sheet Metal Design Guide
As a rule of thumb the distance from the outside of the material to the bottom of the cutout should be equal to the minimum flange length as prescribed by the air bend force chart D = 2,5t + r When using a punch press, or laser cutting, holes should never be less than that of the material thickness...
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Design guide for CNC Milling
The larger the better, but a good rule of thumb is to size the radius to 130% of the radius of the cutter or more The red portion of the image on the far right shows the additional cutter engagement at a corner sized to the radius of the cutter, while the other image shows how much less engagement is required by sizing the corner to 130% of ....
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Peck Drill Depth, Rule of Thumb?
Dec 30, 2005· Try this that I figured out with a lot of 3/16 holes going 2 inches deep What I did was drill abut 1&1/4 deep using G73 with about 1/4 peck, then programmed a custom drilling cycle to go down to the G73 depth and peck from there like a G83 cycle so it could clear the chips out of the hole...
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CAPACITALK No 109
Total 250 HP using rule-of-thumb is 8225 kVAr Now we have (3) different kVAr values: 60, 80, and 8225 kVAr Using Total HP (250) by Table 3 results in 60 kVAr Larger motors have lower magnet currents So if we add up the HP and take the total (250 HP) and use Table 3, we end up with a lower power factor on your system...
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Ball Mill Loading
So as a rule of thumb we use 25% solid loading Empirical Check: Once the mill has been loaded and run for a few minutes, open the cover and look down into the mill You should see some discernible layer of product on top of the media...
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Rules of Thumb
(incremental costs vs standard replacements): about $16 per horse power (HP) for 1 HP-10 HP motors; $8/HP for 11 HP to 100 HP...
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Rod mills, how they function
So, the general rule of thumb for rod mills is to operate no faster than the speed that will obtain the desired product size The operation speed of rod mills is generally determined by the Peripheral Speed of the Inside of the mill Generally, rod mills operate between 280 feet per minute and 480 feet per minute at the periphery of the mill...
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'Rule of thumb'
The 'rule of thumb' has been said to derive from the belief that English law allowed a man to beat his wife with a stick so long as it is was no thicker than his thumb In 1782, Judge Sir Francis Buller is reported as having made this legal ruling and in the following year James Gillray published a satirical cartoon attacking Buller and ....
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Fly Cutter Width
May 16, 2013· The point of using a flycutter is generally to obtain a good finish without any steps ,so you always try to use one at least a bit bigger than the width of the part , If your machine is a proper industrial quality mill it would be normal to have a proper face mill to cover 15" as Billmac explained ,so if I was going to make a flycutter I would probably go at least 4" to have some versatility ....
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End Mill Depth
Composition, rigidity, and size of the end mill greatly influence end mill deflection Rule of thumb for depth of cut: Standard Length of Cut for 2,3 and 4 Fute End Mills: End Mill Size Minimum Corner Radius Maximum Depth of cut End Mill Size Stub Regular Long Extra Long062503132180625093218--12506255001251875375750-1875093750 ....
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Grinding Rule of Thumb
Here is a list of Rules of Thumb often used in Grinding Circuits: Fine ore bins (or stockpiles) that provide feed to the grinding circuit should have a capacity equal to 30 hours of processing Source: Northern Miner Press Grinding is a low-efficiency, power-intensive process and typically can account for up to 40% of the direct operating cost of the mineral processing plant Source: Callow ....
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rule of thumb size reduction milling
Process engineering of size reduction ball milling pdf Sep 07 2016 Remember when HVAC contractors use rules of thumb to size air conditioners they usually pick a number between 400 and 600 square feet per ton Here s what our data show Note that not a single one of these load calculations was as low as the high end of the typical range used in rules of thumb The low number on that graph is ....
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Machinists general rules of thumb
Jun 15, 2012· My number one rule of thumb in machining is: There are no rules of thumb I've found there are just too many variables, the machine tool, condition of the machine tool, type of tooling, work holding etc, all throw rules of thumb out the window Its a complicated trade Whenever I think I have it all figured out I get my ass handed to me...
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Fly Cutter Width
May 16, 2013· Ruff rule of thumb circa 80% of cutter width is ok, go over 90% and it can be a wear issue due to the chip thinning on the cut Above all never step over 50% of cutter diameter, the edge hits the full depth in one solid whack, that plays hell on the machine + the cutter!...
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Best way to determine the ball
A general rule of thumb from the CRC handbook on mechanical alloying and milling denotes a 10:1 ratio for small capacity mills (SPEX), but large capacity mills (attritor) can have BPR of 50:1 or ....
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How sacred is the 4% rule of thumb?
Apr 27, 2020· The 4% rule can also assist in determining the amount of capital you need for retirement For instance, if you need R30,000 per month in today's terms, the 4% rule of thumb ,...
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Basic rules for Design of column by thumb rule
Jun 15, 2018· In this Video Lecture I will discuss Basie rules for Design of column by thumb rule Reading article : https://civilstudents/basic-rule-design-column/ Als....
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Autogenous and Semi
91 Introduction Disintegration and size reduction of some ores is possible in tumbling mills without the aid of grinding media Grinding mills in which comminution takes place without grinding aids are known as autogenous grinding (AG) mills or fully autogenous grinding (FAG) mills These mills use large lumps of rock as the grinding media...
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Max Milling Depth
Aug 19, 2011· Wondering if there is a general rule of thumb for max milling depth? I'm designing a fiber optics cover that is about 4" inches tall Due to design requirements it's going to be machined aluminum I'm debating on whether it should be designed in 2 pieces, each 2" tall and assembled, or 1 piece If milling aluminum at a 4" depth does not require ....
