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  1. #1
    Join Date
    Apr 2021
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    victoria
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    Default Sheraton cross slide and compound slide spindle threads

    Does anyone know the correct spec for the cross slide and compound slide spindle threads?
    I need to get a dome nut for my compound slide.

    I measured the thread on the spindle and it was 0.205" and 28 TPI
    This seems to sit in a bit of no mans land with the thread charts I have

    0.2087" - 1BA with 28.2 TPI
    0.2160" - 12G UNF with 28 TPI
    0.2188" - 7/32" BSF with 28 TPI

    The Hercus dome nut is a different pitch - coarse thread compared to the Sheraton, I suspect 7/32 BSW

    Thanks
    Tony

  2. #2
    Join Date
    Jun 2007
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    sydney ( st marys )
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    4,887

    Default

    Do you have lock nuts on your cross slide or compound slide gib screws,if these may be the same as Hercus, which are 7/32"BSF x 28 tpi, you could then take 1 off and try it on your screw to see if it fits.

  3. #3
    Join Date
    Apr 2021
    Location
    victoria
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    63
    Posts
    28

    Default Cross slide dome nuts

    Pipeclay, thanks for the reply.
    I have one Sheraton dome nut on the cross slide and this also fits the compound slide.

    I purchased a pair of Hercus dome nuts in the hope they would be the same but they are a much coarser thread, I am advised the Hercus is 7/32" 24TPI BSW. I havent had the opportunity to try them on anything else to confirm this as I dont have any 7/23 BSW bolts etc.

    If all else fails then hopefully our local National Bolts dealer will have some bolts/screws that I can try the nuts on to confirm their size etc.

    thanks again, Tony

    Quote Originally Posted by pipeclay View Post
    Do you have lock nuts on your cross slide or compound slide gib screws,if these may be the same as Hercus, which are 7/32"BSF x 28 tpi, you could then take 1 off and try it on your screw to see if it fits.

  4. #4
    Join Date
    Apr 2021
    Location
    victoria
    Age
    63
    Posts
    28

    Default spindle nuts

    Quote Originally Posted by pipeclay View Post
    Do you have lock nuts on your cross slide or compound slide gib screws,if these may be the same as Hercus, which are 7/32"BSF x 28 tpi, you could then take 1 off and try it on your screw to see if it fits.
    and I forgot to say the gib screws on the Sheraton have no lock nuts on my lathe - just a grub screw, but I will check the size and fit with the Hercus dome nuts I have as well as the Sheraton dome nut as you mentioned.

    thanks
    Tony

  5. #5
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Is it worth fitting lock nuts on the gib screws? Do they tend to move around over time?

    Sent from my SM-G935F using Tapatalk

  6. #6
    Join Date
    Apr 2021
    Location
    victoria
    Age
    63
    Posts
    28

    Default Gib Screw lock nuts

    Com-VC
    thanks for the tip re the screws moving around a bit.
    the gib screw heads are virtually flush with both the rests so Id have to get longer screws and lock nuts. The screws should be easy enough to get and I will then have to turn down the tips a bit to fit the gib strips.

    cheers & thanks again

    TonyB

    Quote Originally Posted by Com_VC View Post
    Is it worth fitting lock nuts on the gib screws? Do they tend to move around over time?

    Sent from my SM-G935F using Tapatalk

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