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Thread: 17 tpi thread

  1. #1
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    Default 17 tpi thread

    hi every one . is it possible to cut a 17 tpi thread on a hercus c . An imperial modal
    what change gears are required?
    aaron

  2. #2
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    Default

    Do you have a 127T metric conversion gear for the lathe? That's awfully close to 1.5 mm pitch (1.494 mm), or is that what you are actually trying to cut?

    Frank.

  3. #3
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    Default 1.5 mm pitch

    hi frank . Thanks and Yes you got it. I was thinking about cutting a 1.5mm thread. I dont have the 127 tooth change gear. Ill have a play around with the gears i have all ready and see how close i can get.

  4. #4
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    Default

    [QUOTE=azzrock;1962284]hi frank . Thanks and Yes you got it. I was thinking about cutting a 1.5mm thread. I dont have the 127 tooth change gear. Ill have a play around with the gears i have all ready and see how close i can get.[/Qhttps://metalworkforums.com/f65/t118398-lathe-thread-cutting-change-gear-calculator/page-5?highlight=LathegearsUOTE]


    https://metalworkforums.com/f65/t118...ght=Lathegears

    a forum member called Vernonv wrote a fabulous little program for calculating gear trains. See above thread for download links.

    You keyin your leadscrew TPI, your available gears, thread required (metric or imperial), gearbox ratios if you have one, acceptable tolerance ie + / - 0.2% and it will list the possible gear trains. Or alternately it will calculate what gear is missing and is required.

    Bill

  5. #5
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    Default thanks

    hi bill.
    thanks. Im downloading it to my phone. Thanks for the tip.

  6. #6
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    Default

    Another possible approach is to 3D print the extra gears. I printed some PLA gears to allow me to cut 1.5mm on my very ancient Senecca Falls machine and they worked very, very well.

    Here is a link to a metric conversion for a model A: https://www.thingiverse.com/thing:3352151

    This uses a 60/63 transposing gear and there is a link there to a more precise 100/127 set if you need that accuracy - I know zip about the differences in Hercus models so hopefully of use?

    Ray

  7. #7
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    Default brilliant

    hi Ray .thanks for that idea. my best mate has a great 3d printer. We don't know how to make the patterns/or run the thing.
    Is that link your work? i wonder what colour ill choose.
    aaron

  8. #8
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    Default

    No, that is an online 3D printing sharing website - that has a series of .stl files for the various gears as created by the CAD software and they will need to be run through a 'slicer' program (CURA is an example of a free one) to create GCODE for the printer.
    Have a bit of a search as there are hundreds of odds and ends that people have shared.

    I'll drop you a PM as I'm just up the road in Werribee.
    Ray

  9. #9
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    Default maybe

    if i used a 24 80 and 52 tooth gear i wonder how close that will be///
    I should just give it a try.

  10. #10
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    Default maybe

    if i used a 24 80 and 52 tooth gear i wonder how close that will be///
    I should just give it a try.

  11. #11
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    Default

    I can't recall if a 127t gear would fit in a Hercus. I know there is at least one lathe around that size that uses a 63/60 combination because of the fit issue. If you have the gear details I could cut you one.

    Michael

  12. #12
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    Default 63/60

    hi Micheal,
    thanks for the tip and the offer to cut me a gear. Im not sure what Im going to do yet.
    aaron

  13. #13
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    Default

    The 52 will give you around .001" difference in pitch per thread, a 51 would be preferred.

  14. #14
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    Default supa coach

    Quote Originally Posted by pipeclay View Post
    The 52 will give you around .001" difference in pitch per thread, a 51 would be preferred.
    thanks Pipe clay .Ill have a look if i have a 51.
    cheers aaron

  15. #15
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    Default gear cutter

    hi is this a suitable gear cutter for hercus change gears
    thanks
    Attachment 384510

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