Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Ohaus 505 Scale Problems

Discussion in 'Handloading and Reloading' started by The Grand Baboon, Jan 26, 2012.

Thread Status:
Not open for further replies.
  1. The Grand Baboon

    The Grand Baboon Member

    Joined:
    Apr 6, 2011
    Messages:
    129
    Location:
    Utah
    I've been using a 30 year old Ohaus 505 to weigh all my powder but I'm having issues with it. I think the "magnetic dampening" is a bit too powerful. Sometimes if I put a little bit too much powder the arm will swing up and the magnets will prevent it from coming back down, even if I take the few grains of powder out with a spoon or something.

    I'm thinking about taking out one or two of the magnets, is this a viable solution?
     
  2. 16in50calNavalRifle

    16in50calNavalRifle Member

    Joined:
    Mar 7, 2009
    Messages:
    331
    I'd advise contacting the company. I got a used 5-0-5 - branded RCBS - as part of my used set-up purchases. It was squirrelly, just couldn't get it to settle consistently. I contacted RCBS, they said send it in. Ten days later - a brand new 5-0-5 scale arrives in the mail.

    I'm not sure about your scale, but I'd contact the manufacturer and hope for the same treatment (I believe Ohaus makes the scales for RCBS?).

    I would expect the very wise and vastly more experienced regulars here to agree. The scale may be your most important piece of reloading gear. No reason to put up with the hassle of balky performance, and reckless to trust it with your most important reloading measurements.
     
  3. twofifty

    twofifty Member

    Joined:
    Apr 21, 2007
    Messages:
    1,611
    Here another cause of erratic or slow behaviour:

    I've noticed the RCBC 505's knives must be kept free from dirt, dust, fuzz or fluff of any kind, otherwise the beam action is impeded.

    I store mine under a clear platic cover. The knives and agate beds get cleaned with Qtip & rubbing alcohol 1x/year.
     
  4. joed

    joed Member

    Joined:
    Sep 17, 2009
    Messages:
    2,202
    Location:
    Ohio
    I've had the same problem with mine, usually it's the knives that need cleaning.
     
  5. mbopp

    mbopp Member

    Joined:
    Aug 10, 2009
    Messages:
    919
    Location:
    Upstate NY
    X3 on cleaning the knives and pivots, it fixes my Lyman scale if it starts to act up.
     
  6. The Grand Baboon

    The Grand Baboon Member

    Joined:
    Apr 6, 2011
    Messages:
    129
    Location:
    Utah
    Ok. I'll clean it up and give it a shot.
     
  7. JohnM

    JohnM Member

    Joined:
    Jan 27, 2011
    Messages:
    1,640
    Location:
    Down there by the river
    Yeah, the knife edges and bearing blocks need to be kept spotless.
    Careful wipe down with lintless swabs and alcohol and a puff of canned air like used for photo gear will help get the lint and dust off.
    Also helps to keep the scale covered when not being used, even though the cover for my old Lyman/Ohaus M-5 is always nearby, I'll often forget to put it on.
     
  8. MEHavey

    MEHavey Member

    Joined:
    Jul 27, 2010
    Messages:
    2,402
    Location:
    virginia
    I make it a habbit to "drum" the table that the scale sits on with my fingers
    to settle out the pointer -- oil damped or magnetic damped alike.

    Works like a charm.... :)
     
  9. Certaindeaf

    Certaindeaf member

    Joined:
    Jan 16, 2012
    Messages:
    5,170
    Location:
    Wet Oregon
    Perhaps a static charge has built/builds up.
     
  10. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    It has nothing to do with the magnets.
    Don't mess with them.

    Clean the bearings & knife edge with a cotton Q-Tip and rubbing alcohol.

    Then get a small carpenters bubble level, and make sure the bench & scale is level sideways before you zero it.

    Then, make sure you center the beam in the blocks so neither end of the knife edge is rubbing on the base.

    Then make sure you don't have a furnace vent blowing air on it.

    Then make sure you don't have a light ballest or electric motor causing a magnetic field close to the scale.

    Then cover the scale when you are not using it and it won't collect dust in the knife bearings.

    rc
     
    Last edited: Jan 27, 2012
  11. rockn30809

    rockn30809 Member

    Joined:
    Dec 18, 2011
    Messages:
    58
    Location:
    South Carolina
    Mine will do that when it gets dirty. Like others said the bearing and knife surfaces must be spotless.
     
  12. NeuseRvrRat

    NeuseRvrRat Member

    Joined:
    Jan 24, 2011
    Messages:
    2,098
    Location:
    Wilmington, NC
    i folded a sheet of 8.5"x11" paper longways and keep it over my 505 like a tent when not in use. they also sell scale covers, but the paper works fine for me.
     
  13. gamestalker

    gamestalker member

    Joined:
    Sep 10, 2008
    Messages:
    9,832
    Location:
    SW Arizona
    I deffinitely wouldn't alter it's functions. Every now and then mine, a 5-10, will act up. It's always a case of needing dusting. I use a a plain dry soft tooth brush to brush the magnets off and the blades that the beam pivots on, and as well the beam it's self and the slide weights. Other than that, there is no real areas of function that can go bad.
    Also make sure you don't have anything within several feet of the scale that can create a magnetic or static field such as, anything that has a motor in it like a tumbler for instance, certain types of lighting can also cause problems, so I've been told.
    But what ever you do, don't mess with the inherent functions of the scale. Not only doing so would defeat it's well designed function, but it could void the warrenty, which RCBS is so well known for.
     
  14. The Grand Baboon

    The Grand Baboon Member

    Joined:
    Apr 6, 2011
    Messages:
    129
    Location:
    Utah
    Ok, I'm showing my ignorance here, but what exactly is the "knife" of a scale?

    Edit: Nevermind, I think I found it.

    Should I be wary of shooting any ammunition I loaded before cleaning it?
     
  15. NeuseRvrRat

    NeuseRvrRat Member

    Joined:
    Jan 24, 2011
    Messages:
    2,098
    Location:
    Wilmington, NC
    the fulcrum for the beam. lift the beam off the base and you'll see it.
     
  16. JohnM

    JohnM Member

    Joined:
    Jan 27, 2011
    Messages:
    1,640
    Location:
    Down there by the river
    The little sharp edged bars on the beam that drop onto the floating V-blocks mounted to the base itself.
    Old ones used to be agate, don't know what they are now.
     
  17. TexasShooter59

    TexasShooter59 Member

    Joined:
    Jan 11, 2008
    Messages:
    315
    Location:
    North Texas
    I'm glad to see this as I have a the same situation. My scale is an Ohaus 505(?) I got off of ebay some time ago. It is Ohaus branded. All the metal is bright orange and has a tan plastic cover so that you can "pack it up" and store it. I don't know if the RCBS scales pack up or not. It seems sluggish at times, so I will probably try RCs tips above.
     
  18. twofifty

    twofifty Member

    Joined:
    Apr 21, 2007
    Messages:
    1,611
    quote: "Should I be wary of shooting any ammunition I loaded before cleaning it?"

    That there, zreed042, is a very astute question.

    Since your scale's action was likely impeded by the resistance to movement of fluff/dust, you can not be entirely sure that the loads you developped will weight out the same once the scale is clean and pivots freely.

    This problem would likely have developped gradually over time: dust falls everyday on an uncovered scale and so resistance to movement would have grown imperceptibly every day. This resistance could just as easily be to upward or downward movement.
    Therefore, with a clean scale, your loads might just as easily be slightly heavier or slightly lighter. This outcome would be most pronounced for the last loads your developped as that is when the scale was 'dirtiest'.

    If your loads are middle of the road, probably not a problem.
    If they're at the low or top end...there might be a problem.
     
  19. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    I made a little wood box for mine to set on so it is up where I can read it with bifocals!

    The box doubles as a scale cover when it is not being used as a stand.

    rc
     
    Last edited: Jan 27, 2012
  20. Certaindeaf

    Certaindeaf member

    Joined:
    Jan 16, 2012
    Messages:
    5,170
    Location:
    Wet Oregon
    Who here makes sure that they don't especially store and or perhaps use their precious upon the loading bench proper?
    Unless it's a NASA grade granite or steel test bed, day after day, stroke after stroke, that's gotta take its toll.
     
  21. The Grand Baboon

    The Grand Baboon Member

    Joined:
    Apr 6, 2011
    Messages:
    129
    Location:
    Utah
    Well, I went ahead and shot them (a little over 3/4" at 100 yards:D). It was a few rounds of 308. with 42.5 gr of RL-15.

    The scale is acting much better after cleaning it. Thanks guys, I appreciate your help.

    And RC, that's a wonderful idea. I'm going to build myself a box too. I hate having to crane my neck to see the scale perfectly.
     
  22. ranger335v

    ranger335v Member

    Joined:
    Dec 3, 2006
    Messages:
    3,797
    "...make sure you center the beam in the blocks so neither end of the knife edge is rubbing on the base."

    80% probability that's your trouble point, 20% it's dust in the V bearings/knives. For sure, it's not the magnet.
     
  23. twofifty

    twofifty Member

    Joined:
    Apr 21, 2007
    Messages:
    1,611
    stoning the knife ends?

    ^ ranger335v you've reminded me that I've been thinking of finely stoning the very ends of my 505's knives (the triangular cross-section, not the fulcrum's bearing edge) in an effort to minimize the times that they hang up on the inside of the keeper plates (the metal endpieces held in place by a small phillips screw).

    Whenever the beam 'acts up', I give it a gentle nudge next to the knives. This usually re-centers the knives away from the endpieces. Maybe there are some burrs on the knife ends which could be stoned out.

    Anybody else try this?
     
  24. twofifty

    twofifty Member

    Joined:
    Apr 21, 2007
    Messages:
    1,611
    zreed042 those 308s sound like a great load with tolerance for being out by .1gr.
    They probably also perform equally well in all weather conditions.
     
  25. dickttx

    dickttx Member

    Joined:
    Feb 9, 2011
    Messages:
    954
    Location:
    Fort Worth
    What Certaindeaf said.
    After not reloading and shooting for several years I started again about a year ago. Could not get my scales consistent. Finally realized that it was setting on my reloading table and being jiggled with every pull of the press handle. They need to sit on something that is not even attached to the bench.
     
Thread Status:
Not open for further replies.

Share This Page