GEAR PRODUCTION
I want to make a bunch of different gears that I can control through stepper motors.
Laser cutting gears
3D printing spiral gears
https://www.thingiverse.com/thing:29596/comments
- gear pairs
print 1
Filament: MagicPLA Metallic Emerald Diameter: 1,75mm 1000G
Nozzle temperature : 215-235 degrees
Bed temperature : 50-70 degrees
Print settings : 0.30mm DRAFT
Layer height: 0.3mm
Size: 111.53 x 111.6 x 3 mm
Supports: None
(image of print 2)
Michelle showed me a Twist Lock Trick Box after I showed her the second gear print: https://www.thingiverse.com/thing:4927585
- this would be a cool mechanism for when I want to make replacable components to the larger machine.
Gear pairs March 2023
1
I want to make this mechanism: http://507movements.com/mm_068.html to represent the dynamic between one day and one menstrual cycle. My average cycle is 29 days so I will be using that.
I want them to sit on my stepper motor, so that I don’t need to make a component to attach them together.
Step 1: Important Dimensions
Stepper motor JK42HS40-1704-83AF cylinder pin : 4.95mm diameter
Stepper motor 28BYJ-48 pin: 2.88mm x 4.87mm
Gear B # of teeth: 29 Gear A # of teeth: 1
Step 2: Design in Fusion
NOTES: Backlash:
- the defined clearance between a gear and its mating gear
- with 3d prints, you need built-in tolerances .15mm works well with the size in the tutorial (this will end up being .3mm because we will give the same tolerance to the second gear)
- does depend on print setting
Root fillet radius:
- the higher the value, the stronger the gear teeth, but can’t be larger than 1.1mm
- you want to avoid an undercut shape of the teeth or the gear teeth will not roll smoothly off eachother
Hole Diameter:
- You can apply the center hole here, but you can also apply it later so you have more flexibility
GEAR B:
pressure angle: 20 degrees module: 12.7 number of teeth: 29 backlash: .15 root fillet radius: 6.588 gear thickness: 5 hole diameter: 4.95 pitch diameter: 368.3
GEAR A:
pressure angle: 20 degrees module: 12.7 number of teeth: 29 backlash: .15 root fillet radius: 3.25 gear thickness: 5 hole diameter: 4.95 pitch diameter: 368.3
Gear to motor connection piece
bed of gear: 30mm diameter bed of connection piece: 20mm diameter
Stepper motor 28BYJ-48 pin: 2.88mm x 4.87mm
In Prusa Slicer:
- Creality Ender 3
- Infill 20%
- No brim
- No support
- DRAFT
(image of printed object)
NOTE: the hole was too small for the step motor pin- make it slightly bigger on both width and length
RESOURCES
https://inkscape.org/~abe.karnik/★render-gear-pair https://inkscape.gitlab.io/extensions/documentation/authors/update1.0.html