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Rifles, Reloading, Optics, Equipment
Reloading
Question about powder scales
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<blockquote data-quote="kc0pph" data-source="post: 551475" data-attributes="member: 35934"><p>It comes down to resolution. In a beam balance your resolution comes down to the quality of the bearings. Even a beam balance with modest bearings has a great resolution. An electonic scale suffers from 2 defeciencies. The first is the resolution of the load cell/ strain guage and the sensors historesis. Also there is a compromised resolution that is purposly limits the electronics scale any more reslution that is specified. They dont want to get into the area where there might be ambiguity of the sensor. There is also historesis in the beam balance, and that is dependednt on the bearing system. Its typically very small, and usually smaller than whats used in the digital scale. </p><p> </p><p>Historesis is essentially a loop, and what it is is the difference between going through the upper limit and it being detected, then coming back down through that same point and being detected again. Typically in a digital scale it is not the same point. You can liken it to the fucnace thrrmostat by letting the house warm up above the temp and then letting it cool off below the tempature. In a mecanical scale you have to have a certain force before you will get past the friction in the bearing. It will be the same friction that stops it. Think of a wagon wheel. </p><p> </p><p>It just comes down to resolution and the ability to handle small changes. Cheaper scales just cant do that. Its very expensive to get a good load cell to measure 1/10th a grain. That is a small amount. Where as a beam balance a bearing is very cheap and stamping out parts is cheap as well. It is just important to verify zero. </p><p> </p><p>Take the time if you want precision and buy a beam scale, or blow 400 on an unneccecary digital scale. </p><p> </p><p>Even with a powder master (the automatic powder trickler) you should verify your charge on a quality scale. </p><p> </p><p>If you put too much weight on a scale that is designed to detect 1/10th a grain changes you will damage the load cell and make it unreliable. </p><p> </p><p>To answer the question above about the 1 1/2 gn variance its the friction it takes to move the load cell (compress the stain guage). Just by placing the powder pan on the scale with a different acceleration can change it. When i use my digital scale it is not uncommon for it to read several hundred grains when i am putting the pan on the scale. This is what will damage a scale. </p><p> </p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="kc0pph, post: 551475, member: 35934"] It comes down to resolution. In a beam balance your resolution comes down to the quality of the bearings. Even a beam balance with modest bearings has a great resolution. An electonic scale suffers from 2 defeciencies. The first is the resolution of the load cell/ strain guage and the sensors historesis. Also there is a compromised resolution that is purposly limits the electronics scale any more reslution that is specified. They dont want to get into the area where there might be ambiguity of the sensor. There is also historesis in the beam balance, and that is dependednt on the bearing system. Its typically very small, and usually smaller than whats used in the digital scale. Historesis is essentially a loop, and what it is is the difference between going through the upper limit and it being detected, then coming back down through that same point and being detected again. Typically in a digital scale it is not the same point. You can liken it to the fucnace thrrmostat by letting the house warm up above the temp and then letting it cool off below the tempature. In a mecanical scale you have to have a certain force before you will get past the friction in the bearing. It will be the same friction that stops it. Think of a wagon wheel. It just comes down to resolution and the ability to handle small changes. Cheaper scales just cant do that. Its very expensive to get a good load cell to measure 1/10th a grain. That is a small amount. Where as a beam balance a bearing is very cheap and stamping out parts is cheap as well. It is just important to verify zero. Take the time if you want precision and buy a beam scale, or blow 400 on an unneccecary digital scale. Even with a powder master (the automatic powder trickler) you should verify your charge on a quality scale. If you put too much weight on a scale that is designed to detect 1/10th a grain changes you will damage the load cell and make it unreliable. To answer the question above about the 1 1/2 gn variance its the friction it takes to move the load cell (compress the stain guage). Just by placing the powder pan on the scale with a different acceleration can change it. When i use my digital scale it is not uncommon for it to read several hundred grains when i am putting the pan on the scale. This is what will damage a scale. Hope this helps. [/QUOTE]
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Question about powder scales
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