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  1. #1
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    Default Helical gear maker?

    I want a small helical gear to fit a speedometer drive gearbox on a motorbike.
    Is there some place that does this work?
    It probably needs to be hardened too.

  2. #2
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    What size are we talking here? Getting a one off small gear may not be easy.

    Sent from my SM-G973F using Tapatalk

  3. #3
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    You could try Hercus. Bought bevelled gears from them but not sure if they have helical.

  4. #4
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    A big company could charge a hefty price.
    Someone with an horizontal mill with a geared dividing head setup could do it.
    I don't have such. I'd be happy to talk to anyone who could take it on as a job.
    The OD of the gear is about 12mm.

    https://www.youtube.com/watch?v=0I_wJLsDo-U

  5. #5
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    Aw gee fellas. You could have at least linked to the home grown version...
    https://www.youtube.com/watch?v=5TJ6sn-oGgk

    If I had the specs I could probably do something.

    Michael

  6. #6
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    The person who takes it on will need to know the tooth count and dp/module of the gear. Unless you find someone extremely generous id start looking for spares.

    If ungettable, and it really needs to be hardened id start piling up the shekels.


    Sent from my SM-G973F using Tapatalk

  7. #7
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    Default

    Pretty cool helical gear cutting video, thanks for the link.

    Does anyone know who the highly intelligent, skilled, and patient gentleman is?

  8. #8
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    Quote Originally Posted by Michael G View Post
    Aw gee fellas. You could have at least linked to the home grown version...
    https://www.youtube.com/watch?v=5TJ6sn-oGgk

    If I had the specs I could probably do something.

    Michael
    Yes but I linked a short video to illustrate briefly what is required.

    Do you have a universal mill?

  9. #9
    elanjacobs is online now Apprentice gear maker and machine doctor
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    Default

    We'd need the tooth count, pressure angle, helix angle, OD and bore size. Pics would be helpful too. The helix might be tricky to measure accurately on something that small without a comparator though, ideally you'd provide the original to whoever is doing the job.

    I reckon I could do it at work after hours, the only issue would be finding a window when we have a free hobbing machine so I can't guarantee it will happen soon.

    EDIT: To answer your question about price, by the time you've taken measurements, calculated the differential ratio, turned blanks, set the machine and cut the gear, you're looking at a few hours work; the hobbing itself might only take 5 minutes, but there's all the other stuff that has to happen before you get to that stage. At a nominal shop rate of $120-150/hr it gets very expensive to make 1 of something.

  10. #10
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    Quote Originally Posted by caskwarrior View Post
    If ungettable, and it really needs to be hardened id start piling up the shekels.
    It's a speedo drive gear so not subjected to great loads I think, but some degree of hardness is probably good.
    Is that really expensive to get done?
    I'm thinking some oil hardening steel could be used?

  11. #11
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    Default

    Quote Originally Posted by elanjacobs View Post
    We'd need the tooth count, pressure angle, helix angle, OD and bore size. Pics would be helpful too. The helix might be tricky to measure accurately on something that small without a comparator though

    I reckon I could do it at work after hours, the only issue would be finding a window when we have a free hobbing machine so I can't guarantee it will happen soon.
    I think I could work out the PA and helix, other specs are easy.

    Assuming all parameters can be supplied, what do you estimate the cost to be?
    - for machining only, or including hardening if possible.

    It's not super urgent, I could wait say 3 months.

  12. #12
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    Quote Originally Posted by bob ward View Post
    Does anyone know who the highly intelligent, skilled, and patient gentleman is?
    That sounds like you are talking about the Masked Machinist, feared by cacky handed amateur welders and DIYers everywhere.

    That's not the guy on the video.

    Michael

  13. #13
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    Quote Originally Posted by elanjacobs View Post
    EDIT: To answer your question about price, by the time you've taken measurements, calculated the differential ratio, turned blanks, set the machine and cut the gear, you're looking at a few hours work; the hobbing itself might only take 5 minutes, but there's all the other stuff that has to happen before you get to that stage. At a nominal shop rate of $120-150/hr it gets very expensive to make 1 of something.
    Right, now I'm getting an idea of the cost. It's not justifiable, sadly.
    There's no real market for this gear so no chance to amortise the cost with some sales to others.
    Thank you and others for the info though.

    If I can trouble people with some more questions:

    - I don't have a universal mill. Is one really necessary for helical cutting, or is there a workaround using a plain horizontal mill?
    - Can any dividing head be geared to a mill's leadscrew?
    - Anything special about the gears between mill and div. head, or is any arrangement that can supply the required ratio OK?

  14. #14
    elanjacobs is online now Apprentice gear maker and machine doctor
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    Does it have any shoulders or other features, or is it just a flat gear with a hole in the middle? I'll also need the bore size before I commit to any price because if we don't have an appropriate hobbing arbor I'd have to make one and that will add to the time needed. It's very likely that we do have one amongst the probably hundreds in the cupboard, but just in case it's a weird size...

    Not sure about hardening, but I could use 4140 which should be strong enough as is or I might be able to sneak it in with a batch of nitriding.

    EDIT: The shop rate I mentioned was if you were to walk in the door at an engineering firm, I wouldn't be asking anywhere near that as a private job
    Specialist fine pitch gear cutting from 0.1 Module
    www.rigear.com.au

  15. #15
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    Default

    Could you 3d print this part?

    Could you find a suitable gear in a bike or car wreckers?

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