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Thread: 3.5" live center

  1. #1
    Supporting Member Frank S's Avatar
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    Frank S's Tools

    3.5" live center

    today I needed to make a larger live center for a project that is coming up
    First I drilled the piece of round stock cut off of a shaft that came out of a cotton gin to 2 " then bored it toe 2.8346 72 mm to accept a pair of 6207 CZ bearings then I machined the cone
    3.5" live center-20180521_113735.jpgc.jpg
    next I made a mandrel from a piece of 1.75" hydraulic cylinder rod
    3.5" live center-20180521_161549.jpgc.jpg
    3.5" live center-20180521_184607.jpgc.jpg
    3.5" live center-20180521_184702.jpgc.jpg
    3.5" live center-20180521_184740.jpgc.jpg
    45 Best Harbor Freight Tool Modifications

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  2. The Following 6 Users Say Thank You to Frank S For This Useful Post:

    Jon (05-22-2018), olderdan (05-22-2018), Paul Jones (05-22-2018), PJs (08-27-2018), Seedtick (05-22-2018), Tuomas (05-22-2018)

  3. #2
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    500+ Homemade Tool Plans

    I purposely made the mandrel to be easily removed for use in other things of a larger live center cone if need be
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    Never try to tell me it can't be done
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    Supporting Member pfredX1's Avatar
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    pfredX1's Tools
    I worked at a place that made live centers for the paper industry, or whatever people wanted really gigantic centers for. The big ones were about 6 feet tall standing on end. I forget how many tons they were rated for but it was a lot. I just remember it being some ridiculous amount.

  5. #4
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    Frank,
    Did you consider using a thrust bearing?

  6. #5
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    12 bolts I had 2 of the 6207s I could swap them out for an angular contact but it would hardly be needed since the size of the bearing are so large 35 mm ID 72 MM OD 14 mm thick with 12 11.1 mm balls No more thrust load that could possibly be placed on them by the tails stock screw there really is no need for a thrust bearing or even an angular contact they have a radial capacity of 31022.750n per bearing and if it were even possible to exert as much as 2224n the bearing life would be 7915 hrs at 1200 RPM
    Never try to tell me it can't be done
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    12bolts (05-23-2018), PJs (08-27-2018)

  8. #6
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    Thanks Frank S! We've added your Live Center to our Machining category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:





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