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RCBS 10-10 scale

Discussion in 'Handloading and Reloading' started by Kestral, Jan 18, 2009.

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  1. Kestral

    Kestral Member

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    Using a RCBS 10-10 scale,I trickle in the final grains of powder till the dampened beam is dead level.If I then gently tap the beam,it registers 1/8" to 3/16" over the mark.Could someone with more experience than me tell me which is the correct reading, or what am I doing wrong to get a double reading like this.Many thanks Kestral
     
  2. 243winxb

    243winxb Member

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    Last edited: Jan 18, 2009
  3. RidgwayCO

    RidgwayCO Member

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  4. Galil5.56

    Galil5.56 Member

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    IMO, it's because the main poise tab is rectangular in shape, going into a "V" notch. Almost imperceptible movement can throw off actual measurement by +/- .3 grain in my experience, and I've never seen an Ohaus beam-and-poise scale that did not do this. I usually witness it when the pan is lifted, and the beam allowed to rest, even when done very gently. I'm sure a little bit of binding of the knife edges in the floating agate bearings from side-to-side movement contributes some as well, even when spotlessly clean.

    I mentioned this "problem" in a recent analog vs digital thread, and it goes to show that no scale is perfect.

    http://www.thehighroad.org/showpost.php?p=5232525&postcount=17
     
  5. Kestral

    Kestral Member

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    to 243winxb on reloaders forum

    Thanks for your patience,I`d forgotten I`d posted on this subject before.Its an ongoing problem,so I will scrap it & find a better one. As I note you are a retired dealer,so could I ask which quality scale would you recomend.? Im not to bothered on cost,but I do need reliability more than anything else.Thanks for your help.Kestral
     
  6. 243winxb

    243winxb Member

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  7. 243winxb

    243winxb Member

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    hysteresis http://www.thehighroad.org/showpost.php?p=5138715&postcount=4 Looks like others have run into the same problem your having. First i have hear of it. I am only on my second scale, never had a problem so far. Something i founds>>
     
    Last edited: Jan 18, 2009
  8. 243winxb

    243winxb Member

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    http://www.benchrest.com/forums/showpost.php?p=470811&postcount=11 More on the RCBS
     
    Last edited: Jan 18, 2009
  9. ranger335v

    ranger335v Member

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    "...don't let the ends of the knives rub against the stops on each end of the bearing holders "

    There's your problem. Clean the knives and both agate V bearings, then center the knife bar between the bearing retainer clips. All will be well.
     
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