SolidWorks Worm Drive Tutorial
In this video, we go over how to correctly mate a Worm Drive in Solidworks. We also go over how to insert a dynamic subassembly into a larger main assembly.
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Music from video:
At the top- (Camtasia Audio Library)
• At the Top [Camtasia Audio Library]
Video Transcript(Rough):
Greetings Everyone,
Today’s video is a special request by one of my subscribers.
They asked if I could do a quick overview on how to mate a Worm Drive as part of my SolidWorks Mate Series.
If you have any special requests for tutorials, feel free to leave a comment below with your request. Also, be sure to hit the like button for the video, which really helps the channel with the YouTube algorithm.
A Worm Drive is a special type of gear configuration, where a threaded screw, called a Worm Screw mates with a special helical gear, called a Worm Gear or Worm Wheel.
Worm Drives are typically used to reduce rotational speeds or transmit higher torques. They also can serve as a locking mechanism for a mechanical system. The system cannot rotate unless the worm screw rotates.
Here an example of a worm drive assembly. Note the grooves in the teeth of the worm gear, to allow clearance for the screw.
I’ve created a simple sheet metal bracket to hold the two gears together and added an input hand crank and output shaft.
We’ll actually use a standard gear mate to mate these two parts together.
Click on the Mates icon on the command manager and expand out the advanced mates tab and select the gear icon.
In my previous video, which can be found by clicking the link above, the gear ratio values were the pitch diameters for the respective gears. We know that the gear has a pitch diameter of 2.5 inches and the worm has a pitch diameter of 1 inch. But if we enter those values, the gear will move significantly faster than the worm.
In this scenario, we need to capture the speed ratio of the two parts. The Speed ratio can be calculated by dividing the number of teeth in the gear by the number of threads in the worm.
The gear has 30 teeth and the Worm has only one thread, so our gear ratio is 30:1
Now we see that as we spin the crank, the worm and the gear properly move with each other.
(transition to the gear assembly)
Now lets try inserting the worm gear mechanism into the assembly we’ve used for our Gear and Rack and pinion mate videos.
Now we’ve added another spur gear to the assembly. And we’ll add the worm drive to the opposite end, which the driving shaft running through the spur gear.
We’ll set a locked concentric mate between the spur gear and the shaft, so as the shaft rotates , the gear will rotate with it.
But as we rotate try to rotate the hand crank, we find that the system wont move. That’s because we have to make the Worm Drive subassembly flexible. New subassemblies are, by default, rigid, meaning they can only be moved as a group and individual components in the subassembly can not be moved while the user is in the main assembly’s window.
To make a subassembly flexible, we must right click on the assembly in the feature manager tree and select make subassembly flexible.
This will allow the gears, shaft and hand crank to move, while the bracket remains fixed to the wall.
Now we see that as the hand crank spins, the rest of the components in the assembly spin with it.
This has been a quick overview of a worm drive in Solidworks. If you enjoyed this video, please be sure to hit the like button and subscribe to get notified about future videos.
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