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How to design a 5mm HDT pulley with any tooth count
How to design a 5mm HDT pulley with any tooth count
In this section, we will investigate how to create custom pulleys with any tooth count. Note that this does not mean we can do any diameter pulley. We are always limited to the incriment of one tooth, but this does allow us to print or cut large pulleys for any size belt. This application is most commonly found in a turret design, similar to the one in the image.
Sizing the Pulley
Sizing the Pulley
The first step is to size the pulley needed. This will generally be determined by the size of the turntable bearing which is generally driven by the hole in the center through which the game piece will pass. We have created a lookup table to help define all of the parameters and dimensions of the custom pulley. It can be referenced below.
Example Turntable
Example Turntable
These can be found on various sites including McMaster-Carr.
Here you can look up the dimensions of the pulley.
Design Tutorial
Design Tutorial
Follow along with the tutorial video to get an understanding of how to design a custom pulley as well as what parameters drive the design.
Custom Pulley Design.mp4
Example 146T Pulley
Example 146T Pulley
You can review and download a copy of the pulley design here:
Tooth Profile
Tooth Profile
The following sketch provides the dimensions for a single 5mm HTD tooth. It is also in th esecond tab of the design reference spreadsheet.
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