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Connecting Gears — Parallax Forums

Connecting Gears

LoganLogan Posts: 12
edited 2006-02-08 17:16 in General Discussion
The Parallax Stepper motors (http://www.parallax.com/detail.asp?product_id=27964) come with a 17 tooth brass gear already attached. Does anyone know how I can determine what gears will match with the Parallax gears? There is nothing on any product data sheets about the type of gear attached.

Comments

  • neotericneoteric Posts: 144
    edited 2006-02-06 01:02
    i have wondered about this myself.
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-02-06 03:12
    360 deg / # of teeth = gear pitch
    # teeth / circumference (in·or mm) = teeth / in or mm
    ·
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-02-06 04:03
    To get a really good fit, I would try to buy a matched pair of gears and refit the stepper motors shaft with a new gear. Just knowing the gear pitch may not be enough as teeth can be cut several ways.

    If the gears that you buy have a smaller diameter hole, you can drill them to fit and then glue them to the shaft with Locktite.

    It seems that the gears are glued on and you will likely have to destroy the existing gear to remove it. This can be done by cutting nearly all the way through the gear with a small file. Usually gears are made of softer metal than the shaft and often the teeth are only hardened.

    In theory you can buy a gear puller, but I haven't located one. Hitting with a hammer may work, but you run considerable risk of a bad hit damaging something.

    If you merely want to attach a wheel, you might look at collets designed for model airplane motor shafts.· These offer a nice direct transfer of power and allow you to bolt on and off any wheel or pulley you want.· Collets are needed for small shafts in order to get a good grip.· Set screws will not hold well and often shake loose.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

    ······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

    Post Edited (Kramer) : 2/6/2006 4:06:01 AM GMT
  • LoganLogan Posts: 12
    edited 2006-02-06 17:03
    I think refiting will be the best option for me. It will be much easier to work with gears I am familiar with.
  • neotericneoteric Posts: 144
    edited 2006-02-06 17:05
    PJ,

    Thanks ALOT!· I really thought there was more to it than that....
  • StarManStarMan Posts: 306
    edited 2006-02-06 17:12
    Here are·a couple of companies I've used in the past:

    http://www.wmberg.com/

    http://www.sdp-si.com/


    Chris I.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-02-08 16:19
    One thing you all might want to keep in mind is that these gears ain't cheap in small quantities.

    If you look around, you might find an AC motor that is geared down and you can cannibalize it for very nice brass gears that are in matched sets.

    Typically, there are a variety of these that work off the 60 cycle AC to produce 1 RPM, 60 RPM, etc.

    At least that gives the teenagers out there a ready supply.

    Cheers.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

    ······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • Kaos KiddKaos Kidd Posts: 614
    edited 2006-02-08 17:16
    And us older KIDDS as well! [noparse]:)[/noparse]

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    Just tossing my two bits worth into the bit bucket
    KK
    ·
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