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  1. #1
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    Default Hercus "C worn spindle gear

    Ok, I came across this solution for worn teeth on a Hercus spindle: https://www.hobby-machinist.com/thre...e-gears.52779/

    Looks to be the the bee's knees to me! However, here's the issue. As far as I can ascertain the spindle spur gear on my Hercus 9" has the following specifications:

    Spur gear, 24 teeth 1.3" O.A. diameter, 14.5 pressure angle, 20 diametrical pitch (app 1.27 MOD). (All correct)?

    And guess what no such beast seems to exist as stock

    I figured just buy a gear off the shelf, bore it to size, machine the old old gear back to the good section and affix permanently, but sadly it look like it's not to be.

    Anybody got any suggestions?

    Anyone considering cutting some for sale as replacement items?

    I don't currently have the ability to cut gears unfortunately.

  2. #2
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  3. #3
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    Default

    Quote Originally Posted by Tex260Z View Post

    Spur gear, 24 teeth 1.3" O.A. diameter, 14.5 pressure angle, 20 diametrical pitch (app 1.27 MOD). (All correct)?
    Have been down the path of looking for stock gears but agree there is nothing out there for the spindle unless its custom made. Would definately be worth contacting Mal as I'm sure many others would have asked him about this. If the tumbler gears are approx 1.27 mod (I haven't checked this myself so I'm trusting your research) I'd be tempted to see if you can get a 1.25 Mod stock gear (less than 2% error) in 14.5 PA and see if it matches well enough. But I do know from experimenting that an error of 0.08 Mod (about 5%) is enough to be completely unusable so it might not be possible. I think I've seen 1.25 mod stock gears on ebay or aliexpress or something like that.

  4. #4
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    Default Moyles

    Didn't know about Moyles, thanks.

    Quote Originally Posted by kafie1980 View Post

  5. #5
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    Default

    Also did you have a look at this thread?

    https://metalworkforums.com/f282/t20...e-gear-set-box

    You might want to contact the OP on Facebook to see if he has a spare spindle gear.

    A bit of a long shot but worth a try

  6. #6
    Join Date
    May 2004
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    Melbourne Australia
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    Default

    The teeth on my spindle were stripped, but a toolmaker friend repaired it with a toothed sleeve that he made. Some details are in this thread:

    https://metalworkforums.com/f189/t20...oration/page-3

    The gear cutter that he had access to was not the same form as the original specification, so he made a pair of new tumbler gears to match the new spindle teeth as all the other gears are unaffected. Works great

  7. #7
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    Default Spindle gear

    Quote Originally Posted by Brett C View Post
    The teeth on my spindle were stripped, but a toolmaker friend repaired it with a toothed sleeve that he made. Some details are in this thread:

    https://metalworkforums.com/f189/t20...oration/page-3

    The gear cutter that he had access to was not the same form as the original specification, so he made a pair of new tumbler gears to match the new spindle teeth as all the other gears are unaffected. Works great
    I think I am going down the same path, looks like excellent solution.

    Cheers
    Tex

  8. #8
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    Default

    Quote Originally Posted by Metalmachine View Post
    Have been down the path of looking for stock gears but agree there is nothing out there for the spindle unless its custom made. Would definately be worth contacting Mal as I'm sure many others would have asked him about this. If the tumbler gears are approx 1.27 mod (I haven't checked this myself so I'm trusting your research) I'd be tempted to see if you can get a 1.25 Mod stock gear (less than 2% error) in 14.5 PA and see if it matches well enough. But I do know from experimenting that an error of 0.08 Mod (about 5%) is enough to be completely unusable so it might not be possible. I think I've seen 1.25 mod stock gears on ebay or aliexpress or something like that.
    It's an imperial 20dp 14.5pa. The reverse gear driven by the two reverse tumbler gears is the same 24 teeth.
    Standard change gears are not the same size they are 18dp 14.5pa.
    Hercus spindle repair 2 copy.jpg

  9. #9
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    Default New gear

    Quote Originally Posted by allterrain50 View Post
    It's an imperial 20dp 14.5pa. The reverse gear driven by the two reverse tumbler gears is the same 24 teeth.
    Standard change gears are not the same size they are 18dp 14.5pa.
    Hercus spindle repair 2 copy.jpg
    Michael G just made me one, Champion!

    Anybody happen know the specs on the spindle take up nut locking screw (28 TPI AN) diameter? on a Hercus 9"?

  10. #10
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    Default

    Quote Originally Posted by Tex260Z View Post
    Michael G just made me one, Champion!

    Anybody happen know the specs on the spindle take up nut locking screw (28 TPI AN) diameter? on a Hercus 9"?
    Roller bearing or plain headstock ?

  11. #11
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    Default Headstock

    Quote Originally Posted by allterrain50 View Post
    Roller bearing or plain headstock ?
    Sorry, been a while, life got in the way.
    Plain bearing is the answer, which brings up an interesting point.
    So my headstock bearing surfaces are chewed up pretty badly, but the spindle is actually pretty good.
    I have a company not far from me who do white metal/babbitt/bronze bearing repairs, I was thinking maybe a restoration with babbitt???
    https://bearingremetal.com.au



    IMG_20240526_121249143.jpgIMG_20240526_121338952.jpg

  12. #12
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    Default Hard chrome

    Quote Originally Posted by Tex260Z View Post
    Sorry, been a while, life got in the way.
    Plain bearing is the answer, which brings up an interesting point.
    So my headstock bearing surfaces are chewed up pretty badly, but the spindle is actually pretty good.
    I have a company not far from me who do white metal/babbitt/bronze bearing repairs, I was thinking maybe a restoration with babbitt???
    https://bearingremetal.com.au



    IMG_20240526_121249143.jpgIMG_20240526_121338952.jpg
    Been to see the experts, they say hard chrome is the best way to go.

  13. #13
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    Jun 2013
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    Tasmania
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    Default

    Are you looking for a replacement headstock and/or spindle?

    I have a parts lathe here. I can have a look at the condition of said bits if you like.

  14. #14
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    Default hercus 9C spindle

    Quote Originally Posted by Hornetb View Post
    Are you looking for a replacement headstock and/or spindle?

    I have a parts lathe here. I can have a look at the condition of said bits if you like.
    No I'm good, thanks anyways, (maybe if I bugger this one up)
    Still exploring options, currently looking at bronze bush possibility as recently bought a new mill so I have some capability for machining.
    While we're on the subject of Hercus lathes, this item came with my lathe, does anyone know what it is and if it belongs?
    Looks like some sort of belt speed control pulley.

    Hercus part (2).jpgHercus part (1).jpg

  15. #15
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    Jun 2013
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    Tasmania
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    Default

    I personally wouldn't try and bore your headstock bearings on a mill. They would have been line bored originally. I'd find someone that can do line boring for you.

    Its of course critical to end up with the front and rear bearing perfectly positioned/aligned both in height and linearity to the bed ways.

    Good luck whichever way you go.

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