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Thread: Worm meshing with a spur gear

  1. #1
    Associate Engineer
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    Worm meshing with a spur gear

    My textbook says that a low cost method of creating a wormgear set is to use a worm with a spur gear. However, it doesn't say how to do this. I'm assuming it must have the same pitch but other than that, I'm not sure. Dutton-Lainson makes a worm gear winch which looks like it uses this concept (see the 2nd image and the dimensional drawing: but I noticed that the worm is at an angle...not sure if this helps the two mesh?

    11011_addl_1.jpg

    DD_WG1500HEX.PDF


    Can anyone please help?
    Last edited by Kelly_Bramble; 06-01-2014 at 08:15 AM.

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    low cost method of creating a wormgear set is to use a worm with a spur gear
    Worm gear/spur gear as opposed to what gear arrangement?

    My textbook

    What is the name of the textbook? ISBN?

  3. #3
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    Textbook: Machine Elements in Mechanical Design 4th ed. by Robert Mott, ISBN: 0-13-061885-3
    Section 8-9 explains 3 types of wormgear drives: 1.) cylindrical worm with throated wormgear 2.) special cylindrical worm with standard spur or helical gear 3.) hourglass worm with enveloping-type worm gear.

    Seems like the standard arrangement is cylindrical worm with throated wormgear, however, it will be cheaper to buy a standard spur gear if I could figure out what geometry I need to match.

    Any ideas as to why the link I attached in my initial post has the worm at an angle?

  4. #4
    Technical Fellow jboggs's Avatar
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    The worm is at an angle so that its teeth mesh with the spur gear teeth. Its teeth are in the form of a screw helix. You are seeing the back side of the screw form in your PDF view. The main difference between a worm gear and a spur gear is that worm gear teeth are cut at an angle to match the helix angle of the worm. This arrangement accomplishes a similar effect by just mounting the worm and the spur at an angle to each other.

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