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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Static Balancing
In the latest issue of HSM, there is a tip from a reader about static
balancing, using the arbor-on-rails technique. He uses a lathe bed to get a level foundation, which is a good idea, if your wheel is small enough. He says to turn the ends of the arbor down to .150 or less, because "The smaller the diameter of the axle bearing surface, the more accurate your balance will be." This sounds exactly backwards to me. It seems to me that smaller diameters have greater resistance to rolling and hence would be less accurate. Am I missing something? Bob |
#2
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Static Balancing
Bob Engelhardt skrev 2011-01-10 17:27:
In the latest issue of HSM, there is a tip from a reader about static balancing, using the arbor-on-rails technique. He uses a lathe bed to get a level foundation, which is a good idea, if your wheel is small enough. He says to turn the ends of the arbor down to .150 or less, because "The smaller the diameter of the axle bearing surface, the more accurate your balance will be." This sounds exactly backwards to me. It seems to me that smaller diameters have greater resistance to rolling and hence would be less accurate. Am I missing something? Bob Could it be that with a smaller diameter, the error is a larger fraction of the total? Not sure here, just a thought. Jay |
#3
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Static Balancing
Bob Engelhardt wrote: In the latest issue of HSM, there is a tip from a reader about static balancing, using the arbor-on-rails technique. He uses a lathe bed to get a level foundation, which is a good idea, if your wheel is small enough. He says to turn the ends of the arbor down to .150 or less, because "The smaller the diameter of the axle bearing surface, the more accurate your balance will be." This sounds exactly backwards to me. It seems to me that smaller diameters have greater resistance to rolling and hence would be less accurate. The resistance to rolling (friction) might increase as the diameter gets smaller but not as much as the change in diameter. A 1.5" diameter would need to have 1/10 the rolling resistance to perform as well as .150 -jim Am I missing something? Bob |
#4
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Static Balancing
On Jan 10, 9:27*am, Bob Engelhardt wrote:
In the latest issue of HSM, there is a tip from a reader about static balancing, using the arbor-on-rails technique. *He uses a lathe bed to get a level foundation, which is a good idea, if your wheel is small enough. He says to turn the ends of the arbor down to .150 or less, because "The smaller the diameter of the axle bearing surface, the more accurate your balance will be." *This sounds exactly backwards to me. *It seems to me that smaller diameters have greater resistance to rolling and hence would be less accurate. Am I missing something? Bob Moment of inertia will be bigger with larger diameter, also weight will be greater. Makes a difference if you're using two knife edges like I've seen done for lighter weight parts like model airplane propellors. Maybe not so much with two flats on a lathe bed and a big grinding wheel. If you get too small in relation to the weight of the object you're trying to balance, the shaft is going to bend and screw you up that way. For static balancing of discs like grinding wheels, I'd be more apt to build/adapt a jig like a low-end car tire balancer with a cone, a pointed pivot and a bullseye bubble level. Stan |
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