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Rifles, Reloading, Optics, Equipment
Reloading
Beam Scales
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<blockquote data-quote="RidgeTop" data-source="post: 2581786" data-attributes="member: 121190"><p>A balance beam oscillates on a knife edge. As long as the edge is true it will perform. An electronic balance uses a strain guage. Calibrate it with a known weight and it mathematically calculates the weight of a object. What you don't see in the display is the last digit. It is constantly changing but the computer will take the average of the spread to display.</p><p>Always use a set of calibration, check weights to determine the scale is operating properly. A set of weights for reloading purpose is about $20. A tenth of grain is good for most loads. .1grain. However, for light loads with fast powders like in a pistol load, a .1 gr may be on the edge of acceptable. Look at it as a percent. .1gr in a 300mag is nothing, but in a pistol with a few grains of fast powder you can see how important it is..</p><p></p><p>How sensitive can we go? To determine mass to the .0001 of a nanogram the balance should be on a vibration absorbing table (8" thick marble) to cancel out earth trembles, suspend the object in water below balance and you can determine mass to .000001gram. I have worked with those types of balances. NASA can weigh a fingerprint.</p></blockquote><p></p>
[QUOTE="RidgeTop, post: 2581786, member: 121190"] A balance beam oscillates on a knife edge. As long as the edge is true it will perform. An electronic balance uses a strain guage. Calibrate it with a known weight and it mathematically calculates the weight of a object. What you don't see in the display is the last digit. It is constantly changing but the computer will take the average of the spread to display. Always use a set of calibration, check weights to determine the scale is operating properly. A set of weights for reloading purpose is about $20. A tenth of grain is good for most loads. .1grain. However, for light loads with fast powders like in a pistol load, a .1 gr may be on the edge of acceptable. Look at it as a percent. .1gr in a 300mag is nothing, but in a pistol with a few grains of fast powder you can see how important it is.. How sensitive can we go? To determine mass to the .0001 of a nanogram the balance should be on a vibration absorbing table (8" thick marble) to cancel out earth trembles, suspend the object in water below balance and you can determine mass to .000001gram. I have worked with those types of balances. NASA can weigh a fingerprint. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Beam Scales
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