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  • Bented
    replied
    Originally posted by Corbettprime View Post
    What effect does ball size have on finish? I have some down hole check valves that are 1.25 and 1.50:diameter, with a mirror finish.! They are harder than the hubs of hell, as they were used in an oilwell pump 6000 feet down.
    They have been finish machined already.
    Ballizing is a Finishing Process, you do not want to resize a bore this way. If you press a a 1.5005" carbide ball through a stable 1.499" bore you end up with a 1.500 bore with a burnished finish.

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  • Corbettprime
    replied
    What effect does ball size have on finish? I have some down hole check valves that are 1.25 and 1.50:diameter, with a mirror finish.! They are harder than the hubs of hell, as they were used in an oilwell pump 6000 feet down.

    Leave a comment:


  • plunger
    replied
    Ive seen this before using a simple bearing used for lining things in a 3 jaw .This is a heavy duty one but how do you know how much it can roll to get consistent results.

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  • Bented
    replied
    Roller burnishing has been used in manufacturing for 60 years in the US, Ballizing is a related process where a very precise diameter ball is pressed through a bore bringing it to size with an excellent surface finish.

    I have always been surprised that more home shop machinists do not use this method as it delivers most everything that a hobbyist desires, close diameters and superb finishes. I can only assume that cost deters most from doing it.

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  • Tom S
    replied
    I have that same micrometer

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  • MattiJ
    replied
    Tool was able to shrink surprisingly thick walled workpiece by a large amount and with what looked like only moderate feed force!

    edit: I think it was mostly visual trick with oil running on the workpiece. Can someone tell what he is saying at around 4:25 about size reduction?

    BTW this might be a perfect use for those scrap-auto sourced tungsten carbide balls. Some CV joints have tungsten carbide balls rolling against sort of rough-finished races.
    Last edited by MattiJ; 09-07-2020, 04:21 PM.

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  • MattiJ
    replied
    I have seen some of his videos but this was new to me. Interesting tool, newer seen one like that.

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  • danlb
    replied
    I've learned that Russian machinists is usually a bad idea, just like rushing your proctologist is a bad idea. After all, when they're Finnish, they're Finnish.

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  • plunger
    started a topic Russian machinists.

    Russian machinists.

    Some interesting stuff comes out of Russia.
    https://www.youtube.com/watch?v=GZkpvM4kGvs
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