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  1. #16
    Join Date
    Sep 2009
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    Sydney
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    666

    Default

    Gotcha.

    What oil are people running in there hercus'?

  2. #17
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    64
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    Default

    You will probably get a host of different answers ranging from engine oil to hydraulic to the manufacturers recommendations if you can get it.

    An 32 or 46 grade Hydraulic oil will be fine for all of the lube points,this would be preferred over an engine oil and can be purchased in similar sized containers.

  3. #18
    Join Date
    Sep 2009
    Location
    Sydney
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    666

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    I bought this lathe for a custom motorbike build. Asking bike builders about oil brings up the same cans of worms.

    Appreciate the inputs. Will go with your suggestion.

    Cheers.

  4. #19
    Join Date
    Nov 2005
    Location
    adelaide
    Posts
    597

    Default

    Quote Originally Posted by pipeclay View Post
    You will probably get a host of different answers ranging from engine oil to hydraulic to the manufacturers recommendations if you can get it.

    An 32 or 46 grade Hydraulic oil will be fine for all of the lube points,this would be preferred over an engine oil and can be purchased in similar sized containers.
    yep thats what i use,,,,,, if i remebr i have some chain bar oil for the gears but mostly 46 hydraulic for evrything
    john

  5. #20
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default brass thread

    Ed,
    It's been a while since I measured them up but I think it was 3/8" British standard brass thread 26tpi all sizes. As for the stock size, it looks like they machined from 1/2" round brass to .445 hex finish, about 1 1/8" long finished with about a 1/4" of thread.

    Mal



    Quote Originally Posted by neevo View Post
    I've got an old (1945) Hercus 9" Model C. Popped in to see the chap from Australian Metal Working Hobbiest and bought some oiler caps (silver bits below), however he suggested making the inserts to mount them out of brass.

    He mentioned the size and pitch but I cannot remember what it was. Anyone able to help?

    Eg:


  6. #21
    Join Date
    Sep 2009
    Location
    Sydney
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    666

    Default

    Cheers Mal. I bought something cheap off eBay to see if I could adapt it, looks like I've bought too small as I got 1/8 diameter. Oh well will grab something 3/8" and try again.

  7. #22
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    64
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    Default

    Have a look at dimensions for tapping drill sizes for what you have purchased and what you have been told.

  8. #23
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    666

    Default Hercus front oiler thread pitch and dimensions?

    My incorrect eBay purchase seems to have paid off! Bought these 90 degree 1/8" BSBT to barb fitting. Initially I was worried I had bought the wrong thread but it appears not.

    The original bits. I plan to cut off the barb and drill it out to press fit the oil cups into them:



    Test fit in the headstock:



    The thread may not be perfect but it seems to be going in ok. Worst case it seems like the brass thread would deform before the thread in the headstock. Should get a few extra turns before it's in there tight, which hopefully makes it oil tight and gives it enough space off the headstock.

    Total cost $8.82

  9. #24
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default bspt 1/8

    1/8 BSPT( T for taper) is about a 3/8 in actual measurement and the difference in thread will still work (as you have discovered) because of the limited amount of threads bearing in the casting and the taper of the thread. Be careful not to bend the cover when you press in the oil cups.

    Excuse my error in my first post which should have listed the stock as 7/16 hex brass, didn't think you would be able to get that size. As it turns out I was able to get some and will set about making some up for the website. I will also list short lengths for those who want to make their own.
    Mal
    AMH


    Quote Originally Posted by neevo View Post
    My incorrect eBay purchase seems to have paid off! Bought these 90 degree 1/8" BSBT to barb fitting. Initially I was worried I had bought the wrong thread but it appears not.

    The original bits. I plan to cut off the barb and drill it out to press fit the oil cups into them:



    Test fit in the headstock:



    The thread may not be perfect but it seems to be going in ok. Worst case it seems like the brass thread would deform before the thread in the headstock. Should get a few extra turns before it's in there tight, which hopefully makes it oil tight and gives it enough space off the headstock.

    Total cost $8.82

  10. #25
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    666

    Default

    Cheers Mal. Couldn't resist getting them in the lathe tonight. Turns out the cups are pretty dead on 6.5mm at the base. So a quick go on the drill press and they went in perfectly

    Buggered up one of the holes as it's not 100% centered as there is a slight gap where the cup meets. Will probably grab another brass piece as that will bug me.

    All mounted up and ready to test them:




  11. #26
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default oilers made

    Managed to make some oilers. I thought there would be some offcuts to offer but unfortuneately it worked virtually 100% useage.

    Mal

    hercus oiler2.JPG

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