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IndustryArena Forum > Mechanical Engineering > Linear and Rotary Motion > Ball screw support bearing questions. Are $420 bearings necessary on this machine?

Thread: Ball screw support bearing questions. Are $420 bearings necessary on this machine?

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  1. 11-15-2019, 04:34 PM #16
    jevs
    jevs is offline Registered
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    Re: Ball screw support bearing questions. Are $420 bearings necessary on this machine

    I made a summary chart on ISO 4 (P4) vs ISO 5 (P5) for this size bearing (from charts on a website I found).

    The real possible difference seems to be as follows:

    -.00005" possible extra Bore tolerance
    -.00005" possible extra ID tolerance**
    .00005" possible extra Radial Runout in the inner ring
    .0001" possible extra Radial Runout in the outer ring

    This seems pretty insignificant based on the specs of this machine, so it really is going to come down to weather or not this tiny possible difference is worth the price difference. Without knowing prices, I cannot answer this question really.

    I have asked for quotes for both scenarios so I can figure out which way to go. Pricing these bearings sucks because you cannot just find them online. I have to bug people for quotes and they are all over the place.
    Attached Thumbnails Attached Thumbnails ISO 4 vs ISO 5.jpg  
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