Can Worm Gear Work w/ Spur Gear for Model?

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In summary, the conversation discusses the possibility of using a worm gear mechanism with a spur gear. It is suggested that it is possible, but not ideal as there may be a decrease in gear life and increased mechanical loss due to friction and impact loading.
  • #1
shwagy357
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Does anyone know if it is possible to get a worm gear mechanism to work using a spur gear. I am just trying to make a small model of a worm gear out of acetal plastic for demonstration purposes only. I am thinking it might work as long as the pitch on the lead screw, is the same or a little larger than the pitch on the spur gear. What do you guys think?
 
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  • #2
You can do it, but it's not pretty. I've had to use a system like that in an emergency a couple of times. Your gear life is pretty short compared to a properly matched set, and there's a lot more mechanical loss due to friction, impact loading, etc..
 
  • #3


Yes, it is possible to use a worm gear and spur gear in a model. The key is to make sure that the pitch on the lead screw of the worm gear is equal to or slightly larger than the pitch on the spur gear. This will ensure that the gears can mesh properly and transfer the rotational motion. However, it is important to note that using acetal plastic may not be the most durable option for a model and may not be able to withstand heavy or repeated use. It may be worth considering using a stronger material, such as metal, for the gears to ensure the longevity of the model. Overall, with the proper sizing and materials, a worm gear and spur gear can definitely work together in a model for demonstration purposes.
 

1. How do worm gears and spur gears work together in a model?

Worm gears and spur gears work together by transferring power and torque between parallel shafts at right angles to each other. The worm gear acts as the driver, while the spur gear acts as the driven gear.

2. What are the advantages of using a worm gear and spur gear combination in a model?

There are several advantages to using a worm gear and spur gear combination in a model. These include high gear ratio, compact size, and self-locking capabilities. Additionally, the sliding contact between the worm and gear allows for smooth and quiet operation.

3. Can any type of spur gear be used with a worm gear in a model?

Yes, as long as the pitch diameter and module (or diametral pitch) of the spur gear match the worm gear, they can be used together in a model. It is important to ensure compatibility between the two gears to ensure proper operation.

4. Are there any limitations to using a worm gear and spur gear combination in a model?

One limitation of using a worm gear and spur gear combination is the potential for backdriving, which is when the driven gear can rotate the driver gear in the opposite direction. This can be prevented by using a self-locking worm gear or adding a brake mechanism.

5. How do I determine the gear ratio for a worm gear and spur gear combination in a model?

The gear ratio for a worm gear and spur gear combination is determined by dividing the number of teeth on the spur gear by the number of threads on the worm gear. For example, if the spur gear has 40 teeth and the worm gear has 2 threads, the gear ratio would be 40/2 = 20.

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