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Source for Precision Shaft

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  • Source for Precision Shaft

    I have some 5/8" linear ball bearings that I want to use in a project. So, I need 5/8" rails to go with them, about 15 or 16 inches long. I know that drill rod is not necessairly the straightest stock, so I ordered some "precision shaft", 5/8 size, of course.

    Well the shaft I got was nicely packaged in plastic envelopes and a plastic webbing to protect it from damage. But it is about 0.001" undersized. And it is a loose fit in the linear bearings. OK, I am sure everything has tolerances, but somehow people do use linear bearings with a nice fit to eliminate most play.

    So, how and where do I find some higher precision shafting or drill rod or what?
    Paul A.

    Make it fit.
    You can't win and there is a penalty for trying!

  • #2
    Check McMaster Carr. I was just looking at their shafting last night. Their 303 stainless is supposed to be accurate to .0002.

    http://www.mcmaster.com/#catalog/115/1062/=4nxq04

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    • #3
      VBX Bearings sells linear motion bearings and precision shafting, though I have heard there quality isn't neccessarily the best. http://cgi.ebay.com/NB-Linear-System...item20a46a4c7b

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      • #4
        Look for Thompson 60 case shafting. It is case hardened and ground to pretty tight tolerances. We used it all the time with linear bearings. If you use soft material, the bearings are likely to gall the shaft surface.

        Brian

        Edit: You can find it on amazon.com. It runs about a buck a foot in 3 foot lengths.
        Last edited by bborr01; 11-26-2009, 12:27 AM.
        OPEN EYES, OPEN EARS, OPEN MIND

        THINK HARDER

        BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

        MY NAME IS BRIAN AND I AM A TOOLOHOLIC

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        • #5
          Try http://www.misumiusa.com/ They have shafting as well as bearings and all sorts of other jig/fixturing/assembly/machine design stuff.

          rock
          Civil engineers build targets, Mechanical engineers build weapons.

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          • #6
            Originally posted by bborr01
            Look for Thompson 60 case shafting. It is case hardened and ground to pretty tight tolerances.
            Thompson shafting is also undersize by a thou. I got burned on that when I was looking for a section of TGP shafting to use with a needle roller bearing.
            Last edited by lazlo; 11-26-2009, 11:34 AM.
            "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

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            • #7
              If you notice the linear bearing pillow blocks have a split and a couple of screws to squeeze for lack of a better term the bore of the block down for just this reason.

              Don't know if your project will allow it,but that's one way.
              I just need one more tool,just one!

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              • #8
                Originally posted by wierdscience
                If you notice the linear bearing pillow blocks have a split and a couple of screws to squeeze for lack of a better term the bore of the block down for just this reason.

                Don't know if your project will allow it,but that's one way.
                Mine are linear ball bearings and here is no adjustment. Perhaps I could slit them if there is enough meat?
                Paul A.

                Make it fit.
                You can't win and there is a penalty for trying!

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                • #9
                  Might try these guys. http://www.republiclinearshafting.com I needed a piece of 30 something mm shaft about 11 inches long to repair a cut off saw. Ordered just the length I needed at a very reasonable price. The guys were looking for any business they could get as they are in MI and used to do a lot of die builds. I found them by accident and they were very pleasant to do business with.
                  Paul in OKC
                  PHDesigns

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                  • #10
                    Paul,I'm thinking you have standard ball bushings like these?-

                    http://www.qiujingsh.com/en/images/u...5325132193.jpg

                    If so there isn't much you can do except insert them in a bore that's .001" undersized.Basically they can be crushed like any other bearing,you just don't want the bore undersized too much becasue like any ball bearing too tight a housing bore and they lock.

                    If you have this type-

                    http://news.thomasnet.com/images/large/504/504608.jpg

                    The bore they fit into can be split and fitted with screws to adjust them.
                    I just need one more tool,just one!

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                    • #11
                      Originally posted by lazlo
                      Thompson shafting is also undersize by a thou. I got burned on that when I was looking for a section of TGP shafting to use with a needle roller bearing.
                      Thompson shafting Is spec"d for straighness,roundness, and hardness and is to be used for linear bearings, and yes, diameter goes .0005 to .001 under.
                      For needle bearings, use an inner race, custom shaft, or go with a needle cup and size the cup bore down to address the undersize shaft size

                      I would only use Thompson Rod for a linear application
                      Rich

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                      • #12
                        Some of the bigger steel suppliers(castle?) sell hardened and chromed 1045 shafting for use in hydraulic cylinders.

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