Need Help! Tapping Thomson 1 1/4" ss 440c linear rail


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Thread: Tapping Thomson 1 1/4" ss 440c linear rail

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    Default Tapping Thomson 1 1/4" ss 440c linear rail

    Guys so I need to mount new round linear rails on my machine. So I found a deal from eBay but they seem to be the 440c case hardened and not the normal 1566 steel. I was pretty sure I'd have no trouble cutting the normal rail with a carbide endmill then drilling and tapping as normal but will I be able to do the same on this stainless rail? Or should I just buy the regular rail? I would prefer the stainless just because it won't rust for sure but really I just need the hardest rail possible as my last rail essentially seems like it got soft and the balls from the linear rail dug into it causing grooving. This may have been caused when one of the linear bearings seized but they have been replaced.

    For reference this is Thomson 1 1/4 linear rail and super 20 bearings

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    Default Re: Tapping Thomson 1 1/4" ss 440c linear rail

    Just to add the holes are going to be drilled and tapped 1/4-20



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    Default Re: Tapping Thomson 1 1/4" ss 440c linear rail

    Nothin guys I just need to know to see if I should accept this offer?



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    Default Re: Tapping Thomson 1 1/4" ss 440c linear rail

    To answer a few questions, 440C can still form rust on it. The grooving is inherently normal. Tapping in 440C alone can be tough on taps, let alone it being case hardened. We make out own out of 303 BSQ CG&P and then have them hard chromed, then use rulon lined liner bushing but you application might not work with this, I dont know.



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    Default Re: Tapping Thomson 1 1/4" ss 440c linear rail

    Quote Originally Posted by djr76 View Post
    To answer a few questions, 440C can still form rust on it. The grooving is inherently normal. Tapping in 440C alone can be tough on taps, let alone it being case hardened. We make out own out of 303 BSQ CG&P and then have them hard chromed, then use rulon lined liner bushing but you application might not work with this, I dont know.
    I was looking at the solid bushings but the cost is prohibitive. It seems that I'll just get the normal case hardened and if I can find a good deal I'll se if I can get the bushings vs the bearings.



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    Default Re: Tapping Thomson 1 1/4" ss 440c linear rail

    Quote Originally Posted by ianagos View Post
    I was looking at the solid bushings but the cost is prohibitive. It seems that I'll just get the normal case hardened and if I can find a good deal I'll se if I can get the bushings vs the bearings.
    Call bearing services, they'll get what you need with predrilled and tapped holes.

    Sent from my SM-G955U using Tapatalk



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Tapping Thomson 1 1/4" ss 440c linear rail

Tapping Thomson 1 1/4" ss 440c linear rail