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RCBS 505 scale problem.

Discussion in 'Handloading and Reloading' started by possumbelly220, Sep 15, 2018.

  1. possumbelly220

    possumbelly220 Member

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    I have a RCBS 505 scale that will not zero unless you put something under the adjustment screw to raise the end of the scale up. I'm having to put a coke bottle cap under it to get it high enough to adjust to zero. After that it's spot-on. Anyone else ever had this problem?
     
  2. badkarmamib

    badkarmamib Member

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    Probably a stupid question, but are you certain it is on a level surface?
     
  3. possumbelly220

    possumbelly220 Member

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    I should have stated that in my original post, and yes it's on a level surface, works fine and very consistent.
     
  4. Bandit67

    Bandit67 Member

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    Is it a new scale? If not is this a new problem? It almost sounds like the pan is too heavy.
     
  5. cfullgraf

    cfullgraf Member

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    There is a cavity under scale pan for adding or subtracting weight to make the beam balance where you want.

    This is usually adjusted at the factory.
     
  6. Drail

    Drail Member

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    Call RCBS. They WILL take care of your problem. Good people.
     
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  7. possumbelly220

    possumbelly220 Member

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    Old scale, old problem, although it worked fine when I got it. Pan has never been taken apart.
     
  8. ArchAngelCD

    ArchAngelCD Member

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    Regardless of the reason you need to recalibrate your pan support assembly. Unscrew the support assembly, remove all the lead shot in the bottom of the pan holder. Put it back together and hang the assembly and pan as usual. Screw the level screw so that it is in the middle of the range. Move all the slides to zero then add weight to the pan until the beam pointer lines up with the line on the plate.

    Now take the pan support assembly apart again and add the weights from the pan to the bottom of the pan holder. Screw it back together and your scale will again be adjusted to zero. Of course use the adjustment screw for any fine adjustments needed.

    Hope I explained it well enough, good luck.
     
  9. possumbelly220

    possumbelly220 Member

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    Thanks, ArchAngelICD, I will give that a try!
     
  10. Blue68f100

    Blue68f100 Member

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    Sound like you do not have the original pan that came with the scales. What ArchAngelCD said will correct the problem.
     
  11. bds

    bds Member

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    Then why not raise the scale up with the adjustment screw?

    Picture below shows my RCBS 5-0-5 zeroed and there's plenty of thread left on the screw to raise the scale by thickness of bottle cap.

    [​IMG]
     
    Last edited: Sep 15, 2018
  12. ArchAngelCD

    ArchAngelCD Member

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    bds, the OP said he runs out of adjustment and has to add the bottle cap to raise the scale high enough on one side.

    The method I described is proven and often used when the original pan is replaced. It's simple and it's flawless.
     
  13. bds

    bds Member

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    The adjustment screw on my RCBS 5-0-5 will raise the scale to move the pointer beyond the range limit. Picture below shows the adjustment screw turned out more than thickness of bottle cap and there's plenty more threads left.

    If OP's scale looks like this and still needs bottle cap under the adjustment screw, there's something wrong.

    [​IMG]
     

    Attached Files:

    Last edited: Sep 15, 2018
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  14. bds

    bds Member

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    One cause could be pan somehow got replaced with heavier than original pan. If that's the case, weights in the pan support could be removed to compensate as outlined by ArchAngelCD's post.

    But since OP posted the scale worked fine before, I would suggest cleaning of agate stone bearings and posts just to ensure they are "free floating" and not binding with the knife edges of the beam. To clean the agate stones and posts, remove the covers and clean (especially the bottom of "V" notches) with alcohol. Also inspect the knife edges of the beam and clean as necessary.

    [​IMG]
     
    Last edited: Sep 15, 2018
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  15. cheygriz

    cheygriz Member

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    Dumb question, probably. But are you zeroing your beam with scale check weights??
     
  16. possumbelly220

    possumbelly220 Member

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  17. possumbelly220

    possumbelly220 Member

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  18. bds

    bds Member

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    You cannot use bullets as check weights as they can vary by 1 grain to several grains depending on type and brand.

    [​IMG]
    If your 5-0-5 has been working fine (with the same pan) and now requires you to max out your adjustment screw and put a bottle cap under it to zero, something must have changed.

    I definitely recommend a set of check weights to verify the accuracy of your scale in the powder charge range you are using.
     
    Last edited: Sep 15, 2018
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  19. possumbelly220

    possumbelly220 Member

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    Thanks everyone for the info, and bds, I will work on getting a set of check weights.
     
  20. ArchAngelCD

    ArchAngelCD Member

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    Did you adjust the weights in the pan holder yet? Everything back to normal now?
     
  21. possumbelly220

    possumbelly220 Member

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    ArchAngelCD, tried it and it works fine now! I removed three of what looked like #12 shot and that worked. How it got off will remain a mystery to me, but thanks again for your help!
     
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  22. ArchAngelCD

    ArchAngelCD Member

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    I'm glad I could help. That's what this forum is all about...
     
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  23. 1066

    1066 Member

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    If your sure you're still using the original pan, then there's a good chance that your copper damping plate on the beam has taken a bit of a knock (or may even have a little play in where it's riveted to the beam.) The plate only needs to move a few thou to upset the balance more than can be compensated with the level adjuster.
     
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  24. total recoil

    total recoil Member

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    I've had the same problem, but with a shot or two being lost from the pan. I've got a few pounds of 7 1/2 shot so I can spare a few to adjust the pan for balance at zero.
    My brother gave me a few lab weights and also made a few small weights out of paper clips that were adjusted using wire cutters and a lab quality scale to calibrate them. My scale is on the money.
    If you know someone who works in a lab with quality scales, they can make 3,5,10,20 grain weights easily. It's a whole lot cheaper than buying a set of test weights.
    A can of compressed cleaning gas is also handy for cleaning the agates.
     
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