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Thread: Bar runout

  1. #21
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    Quote Originally Posted by edtcadcam View Post
    1018 cold rolled is a pretty precision material with a tolerance of .002 "
    No it is not.

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    Can you put the out end in a steady?

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    Quote Originally Posted by enginuity View Post
    It's cold drawn. Many times at the end of cold drawn bars you will find that it is bent from the shearing process.

    You can try by cutting 4-6" off each end first to see if that helps the problem.

    As already stated, I would highly recommend getting centerless ground bars for process reliability.
    The 6" off the end part.

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    Put an exactness test bar [2] into the axle. Put the tip of the marker straightforwardly underneath the check line to gauge runout. The TIR at the check line should not surpass 0.0005" (0.013 mm). Put the tip of the marker against the test bar roughly 6.0"(150 mm) underneath the check line to quantify runout.

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    Quote Originally Posted by john411 View Post
    Put an exactness test bar [2] into the axle. Put the tip of the marker straightforwardly underneath the check line to gauge runout. The TIR at the check line should not surpass 0.0005" (0.013 mm). Put the tip of the marker against the test bar roughly 6.0"(150 mm) underneath the check line to quantify runout.
    The fuck are you talking about...who said anything about axles and what the hell is an exactness test bar? Put it straightforwardly under? Did you drink your breakfast, and I don't mean protein shakes?

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    Quote Originally Posted by plastikdreams View Post
    The fuck are you talking about...who said anything about axles and what the hell is an exactness test bar? Put it straightforwardly under? Did you drink your breakfast, and I don't mean protein shakes?

    He's a spammer building cred/post count. Check his history. 3 posts, nonsensical, one about the stock market. Just report him and move on.

  9. #27
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    Quote Originally Posted by edtcadcam View Post
    This is about 12,000 parts, everything should work from a bar, quickly and without problems.
    Charge them extra to have good round material and get feedback on it if the print seems to prove to you that you might get caught with a problem. Money gets them talking and on the level. They likely know the issue well if they have need of that many parts. That will get them to start talking about their realistic expectation.

    I think you should address the concern at this point since you are at a balk in this situation. Sorry I did not mention it earlier. Usually these things work out if not then you will just resent the extra time and expense which you think they need. Given you are at the mercy of raw bar stock material trueness right off the bat.

  10. #28
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    Quote Originally Posted by plastikdreams View Post
    Regular off the shelf cold rolled bar is not straight, nor concentric. If you believe that than you are more the fool than originally led on. Centerless ground bar will be straight and concentric.

    If only a few are out of spec, throw em out and continue on.
    Thank you. At this point best to tell him to figure it out himself if he does not believe it.

  11. #29
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    Quote Originally Posted by Fancuku View Post
    No it is not.
    This kind of things bring on heavy drinking for hard headed bubble brains. Done. Would not have wasted five minutes on it if it were some hot shot complaining at a shop.
    Last edited by Trueturning; 06-02-2021 at 08:52 PM.

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