gears

bobroanbobroan Posts: 37
edited 2004-08-30 - 03:12:16 in Robotics
Can anyone suggest places I can get gears that will work with the stepper motors Parallax sells?

thanks

bob

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-08-28 - 14:23:06
    Funny you should post this Bob...I was just looking at the spec sheet for the 2 I just bought to see what the shaft size is...It's 3mm.· So it would seem any Gear, Pulley or wheel designed for a 3mm shaft should work.· My only question is how to get the existing gear off, without damaging anything.· The previous stepper motors I used all had gears or pulleys with set screws...



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    ·
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
  • jakjrjakjr Posts: 88
    edited 2004-08-28 - 17:54:11
    If the gear is glued on you can take a solderign iron and heat to heat up the gear, it melts/softens the glue and it should pull off easily.

    NOTE-this trick wont work with certain types of glues so do dont get mad if it doesnt work.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-08-28 - 19:07:35
    I think it's press-fit on the shaft...But I'd like to talk to someone from Parallax to be sure...Monday, I guess...Unless a tech catches this and answers it on the forum...

    cool.gif

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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    ·
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2004-08-29 - 05:47:43
    You may need a 'gear puller'. Try a google search.

    The following is a description, but I really this a picture is much better.
    If you talk to an automotive or motorcycle mechanic, they usually have or rent one for the large gears and pulleys that are attached to shafts on the engines. They can show you a big one (useless for steppers, but useful for the concept).

    It is basically an adjustible U-shaped device that can grab the gear under two sides, then a screw (like a C-clamp screw) pushes down on the shaft from the center of the U and eases the gear away from it.

    To put on a new gear, you may need a small lever press or you can use a small hydrallic auto jack in box-like frame to push the new gear on. Hammering gears on is not really a very good way to go - lots of risks of misalignment and damage.

    You really have to order the gears in matched sets as there are so many angles and sizes to teeth that you are likely to mis-measure.

    Once you see a 'gear puller' you can begin to figure out many ways to make one.
    Alternatively, you can grab the gear in a vise and use a small steel punch to hit the shaft and pound it out.
    (but again -- this is risky, you may damage more than the gear)

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    G. Herzog in Taiwan

    Post Edited (Herzog) : 8/29/2004 5:49:54 AM GMT
    Hwang Xian Shen, Puddleby-on-the-Marsh.
    All things considered, I can live and thrive without Microsoft products. LINUX is just fine.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-08-29 - 15:30:50
    Actually, I have a gear puller (Craftsman) for my Automotive tools...But as you said, it's not going to help me on a Stepper.· I will have to think of something that will work on that small of a shaft.· It's not a real priority right now...



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    ·
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
  • Sid A.Sid A. Posts: 2
    edited 2004-08-29 - 20:15:03
    Chris,

    Perhaps a wheel/gear puller used by clock makers would work. A google search should find several. Good luck.

    Sid A
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-08-30 - 03:12:16
    Thanks, I'll check.



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    ·
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
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