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3D CAD:
GT2 pulleys for focusing a camera lens


Contents:

  1. Calculating number of teeth
  2. CAD of 15 teeth pulley, part 1
  3. CAD of 15 teeth pulley, part 2
  4. CAD of 15 teeth pulley, part 3
  5. CAD of 15 save and prepare to print, part 4
  6. CAD of 174 teeth pulley, part 1
  7. CAD of 174 teeth pulley, part 2
  8. CAD of 174 teeth pulley, part 3
  9. CAD of 174 save and prepare to print, part 4
  10. CAD of 174 clean from support material, part 5
  11. CAD of 174 new version, part 6
  12. CAD of 174 slicing and printing, part 7
  13. CAD of 12 and 15 teeth, new design, part 1
  14. CAD of 12 and 15 teeth, printing, part 2
  15. CAD of 180 teeth pulley, part 1
  16. CAD of 180 teeth pulley, part 2
  17. CAD of 180 teeth pulley, part 3
  18. To be continued

Note:
I take no responsibility or liability for what are written here, you use the information at your own risk!


2, CAD of 15 teeth pulley, part 1:

Construction plan:

Now I start to CAD the little pulley on the focus motor, I decided to have fifteen teeth on it. I'm sure that I have to print many of them until I'm satisfied and can change the teeth number later if necessary. That's the idea with a 3D printer, easy and cheap to make new ones. I use FreeCAD to do this, I try to show as many step as possible, but you also have many tutorials on YouTube to look at.


Start of the GT2 pulley macro:

You have to have the GT2 pulley macro already installed, here you download it:

GT2 macro download:

There are other plugins that can do this too, which is best I don't know yet.

Just copy the code and paste in the Macro in FreeCAD.

3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

You don't have to create a new document, the macro will do that. Start with an empty board like this.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

Start Macros from Macro menu.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

I only have one macro installed and that is the GT2 macro. Click on it and then Execute.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

A menu comes up that let you choose some parameter to create the pulley.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

With the 15 teeth pulley the pulley's maximum shaft diameter is limited to 4.77 mm, my focus motor shaft is 6 mm. I have to solve that problem. I made a wider base and in that part of the pulley I can have a 6 mm shaft hole. I plan for a timing belt that is 6 mm wide and make the teeth 6.5 mm wide to have some extra space around the belt. I must also include the base's 12 mm, together 18.5 mm. The diameter of the base I want to have to 14 mm, but for some unknown reason the D is the radius, 7 mm. There is also an outer flange.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

Click on Create and a drawing comes up on the screen, it can take a while if it's a complex drawing.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

Tilt the object and you will see how it looks. Each time I change the parameters and create a new pulley it opens a new window.


3D CAD: Making a drawing for GT2 pulleys to the focuser of lens

When you have found the correct parameters you can delete the earlier pulleys, click the x and choose Discard.

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To page III (part 2)

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