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Rifles, Reloading, Optics, Equipment
Gunsmithing
Spinning on bearings - concentricity measurement
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<blockquote data-quote="Trickymissfit" data-source="post: 620991" data-attributes="member: 25383"><p>rotating a case on ball bearings is just one way to measuring a case runout. I built one that used ball bearings, but later determined it was a comprimise at best. I came to this conclusion due to the contact made between the case and the outter race of the ball bearings, and then I also took into thought that a typical ball bearing has a certain amount of lateral end play. I did modify that setup with a ground sleeve that was shink fit to the bearing OD. I now use a ball bearing setup, but with precision steel bearing balls that do not rotate.</p><p> </p><p>The first gauge I built used two .50" ground dowl pins in steel blocks. The steel blocks sat on three points (never use four points). Worked very well once I had all the bugs worked out of it, and must have made two dozen of them for friends in need. The second one was with the ball bearings, and later adding the steel rings to the O.D. of the bearings.</p><p> </p><p>Later I went with the steel balls, and probably made three or four before I decided on the needed spacing. The setup I use now is very simple, and will work on any case from .38 Special to .300 Weatherby mag.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 620991, member: 25383"] rotating a case on ball bearings is just one way to measuring a case runout. I built one that used ball bearings, but later determined it was a comprimise at best. I came to this conclusion due to the contact made between the case and the outter race of the ball bearings, and then I also took into thought that a typical ball bearing has a certain amount of lateral end play. I did modify that setup with a ground sleeve that was shink fit to the bearing OD. I now use a ball bearing setup, but with precision steel bearing balls that do not rotate. The first gauge I built used two .50" ground dowl pins in steel blocks. The steel blocks sat on three points (never use four points). Worked very well once I had all the bugs worked out of it, and must have made two dozen of them for friends in need. The second one was with the ball bearings, and later adding the steel rings to the O.D. of the bearings. Later I went with the steel balls, and probably made three or four before I decided on the needed spacing. The setup I use now is very simple, and will work on any case from .38 Special to .300 Weatherby mag. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Spinning on bearings - concentricity measurement
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